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### Question #: 14390

Question: What is the diameter of the two mouting holes on the 1/2in antiback lash acetal nut?

Current Solution

The two holes in the 1/2" 10 TPI 5 start antibacklash nut is 4.445 mm (0.175 inches) diameter.

Respond:

### Other Possible Solutions to this Question

• What is the flange diameter, and the flat to flat dimension on the spring loaded 1/2-10 lead screw nut?

Hi, the dimension flange thickness for the 1/2" 5 start 10 TPI antibacklash nut is 0.27 inches or 6.858 mm. The flange diameter is 1.5 inches or 38.1 mm. The flange has two flats that measure 1 inch or 25.4 mm from flat to flat.

The drawing can be seen here:
https://www.buildyourcnc.com/images/Antibacklash_nut_1_2_drawing-800.JPG

Or you can click on the drawing image on the product page:
https://www.buildyourcnc.com/item/mechanical-leadscrews-antibacklash-nut-!5-5-starts-10-tpi

Click the link to respond:
What is the flange diameter, and the flat to flat dimension on the spring loaded 1/2-10 lead screw nut?

• what is the outside diameter of each opening on the metallic T connect for the Vacuum System Cups and Nozzle for pick and place?

The outside diameter on the T-Connector is 1/4" (.25 inch)

• What are the mounting hole dimensions of the 1/2" Anti-Backlash Lead Nut

The mounting hole dimension for the 1/2" 10 TPI 5 starts antibacklash nut is 1.13" or 28.7 mm. I added a drawing to the antibacklash nut product webpage so you can see other dimensions.

Antibacklash nut product webpage: https://www.buildyourcnc.com/item/mechanical-leadscrews-antibacklash-nut-!5-5-starts-10-tpi

Thanks

Additional Information:
You can also see the drawing directly here: https://www.buildyourcnc.com/images/Antibacklash_nut_1_2_drawing-800.JPG

Click the link to respond:
What are the mounting hole dimensions of the 1/2" Anti-Backlash Lead Nut

• What is the diameter of the #25 Idler sprocket

Inner diameter of our #25 Idler Sprocket is 0.369"in/ 9.3mm, an outer diameter(tooth-tooth) is 1.716"in/ 43.5mm.

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What is the diameter of the #25 Idler sprocket

• What size of stepper drives the 3/8 acme thread and it's anti backlash nut?

The stepper motor that we currently use for our 3/8" lead screw, is 100 oz-inch motor on our 3D printer machine. But using the correct coupling you may use a 425 oz-inch stepper motor to run with the 3/8" lead screw.

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What size of stepper drives the 3/8 acme thread and it's anti backlash nut?

• WHAT CAUSES ONE OF MY TWO AXIS MOTORS TO STOP WHILE THE MACH3 PROGRAM IS STILL RUNNING

If one of your stepper motors decides to stop moving and the others are moving during a CNC milling or laser cutting job, then there could be two things that could be causing this.

- The motor found its limiting torque (usually comes with a not-so-pleasant sound). This is where the control software is trying to move the stepper motor too fast (velocity, or too fast too quickly, acceleration) and the load against the stepper motor (inertia of the machine, or the material against the end mill while milling). Recommended action is to lower the velocity and/or acceleration, and/or lower the feedrate when cutting.

- There is a wiring issue with the wiring from the driver to the motor. This could be a loose wire, or a chafed wire (or two shorting together). It can also be a loose digital wire from the controller board to the driver. Sometimes wire ties can be the culprit. Recommended action would be to thoroughly inspect the wiring.

It's probably not the limit switches since that would cause a stop to the entire motion of the cnc router or laser machine.

Sometimes Mach3 will show a status when something goes wrong, but in cases where the motor is stopping due to its torque limit, then that would not be shown in the status. It's always good to check it anyway.

Additional Information:
I need to clarify my situation a little better after going to my shop and trying to run another program on Mach 3. About 15 minutes into the milling process all the motors (2-X axis, Y axis and Z axis)stop but the program continues to run. I stop the program and after a couple of minutes when I try to restart the program all the motors start working again. Then after another 15 minutes or so, all the motors stop again. I checked and rechecked my wiring. This has never happened to me before when running the same programs with the same setups and motor speeds. All of a sudden when I reloaded a program I successfully used before it does this. Do you have any recommendations?

Additional Information:
Yeah, it sounds like a more complex issue. Have you tried running in the air without using the spindle. This may be a power related issue.

Additional Information:
That's exactly what I did. I ran the program without the router motor on just to see if the motors would get through the whole program but they stopped working after about fifteen minutes and then I was able to start them again after about 3 or 4 minutes. I never had this problem before so you can imagine my frustration especially after ruining a couple of projects on expensive material.

Additional Information:
Sure. I can completely understand. Try this: disconnect all but one of the driver from power and digital connection and do the air run. Repeat this for each driver and note your findings. This will rule out the drivers causing a power failure.

Also, is your stepper motors and drivers on a separate power circuit from the computer?

Additional Information:
I will try disconnecting each driver and digital connection, which will be a real pain because it will be hard to access.

All the stepper motors, drivers and computer are plugged into the same power strip.

Additional Information:
Ok, so there is no power failure going on, but I believe it is necessary to test each stepper motor and driver pair individually. Hopefully that will lead to a conclusion.

Additional Information:
It will take a little time but I will do it and report back on my findings.

Additional Information:
Curious, what machine is exhibiting this problem?

Additional Information:
I purchased a BYCNC kit back in 2009 with an approximate cutting area of 2' X 4'. I later changed out the Z-Axis Motor and controller for a larger one and have two X-axis motors and controllers. In 2010 I rebuilt the machine out of birch plywood instead of the particle board that the kit supplied. I sent Patrick pictures to him. The machine never gave me a problem till now.

Additional Information:
Thanks for the update. This is Patrick by the way. I answer pretty much all of the Customer Service questions. That machine has given quite a good history.

Additional Information:
I love the machine and made a number of samples of my work for my e-commerce site, but I can't start selling product until I know this problem is solved because I will not be able to fulfill orders. I finally got all the electronics out of its enclosed protected area near the machine so that I test each controller as you recommended. I hope the problem can be rectified. Will let you know.

Additional Information:
Thanks.

Additional Information:
I tested each stepper motor and driver pair individually and they worked so what might be the next step?

Additional Information:
Did each stepper motor driver pair work for the full +15 minutes?

Additional Information:
Yes, I had them in operation for over 30 minutes.

Additional Information:
Ok, well it’s good that the motors and driver are ok. We are now down to the power supply and the breakout board as possible causes for the stop. I have a feeling it may be the power supply where with all three drivers drawing current and the power supply maybe getting too hot. Is the fan in the power supply working? You can also test to see if there is 36 volts on the power supply voltage output (V+ and V-).

Regarding the breakout board, if you have an oscilloscope, you can test if the driver pulses are outputting, but I would consider this as a last resort after you determine if there is a problem with the power supply.

Additional Information:
I tested the power supply with a voltmeter and each output was registering 39-40 volts. I think the problem may be the g-code. I am using V-Carve pro to do design and output to Mach 3 Mill g-code. When I studied the g-code lines I noticed that further into the program the z-axis g-code stopped zeroing out to move to the next part of the carving. In other words both the x and y keep moving and the z just stopped working because there was g-code missing. I think something is missing when the design was converted to g-code. I noticed that when I ran a simpler project it worked without problems so I need to investigate this further.

Additional Information:
New Update, Its not the g-code. I started to run the long program and everything was working fine until about 45 minutes into it, all the motors stopped working (but the program was still running) and there was a high pitched hum. When I put my hands on the motors they were all trying to move but it seemed they were all stalled. I turned the power off, gave it a minute and when I turned it back on I was able to move the motors again. Could this be a power supply problem?

Additional Information:
It does sound more and more like a power supply problem. Did you test the power supply after the motors stopped?

Additional Information:
No, I did not. What should I be looking for.

Additional Information:
It’s good that you know the voltage during normal operation, so you have a base understood. If the power supply is the problem, the voltage will be reduced or non existent when measured after the problem.

Additional Information:
Also, check to see if the fan is running on the power supply when the motors stop. That may (not absolutely) be an indication.

Additional Information:
I'll run another test, check the voltage and fan when the problem occurs and let you know. Thanks for hanging in there with me as we try to resolve the problem.

Additional Information:
It’s my pleasure. This service is rarely used and is faster then email. Odd nobody uses it. Any recommendations you can give would be great. No problem using this FAQ to pose ideas as this resolution will be cleaned up later.

Additional Information:
It might be that people do not realize you can communicate through the sight like this because they are so used to e-mail and texting. You may want to explain this feature in the customer service section.

I ran the program this morning and it did not take long before the motors stopped. While operating the voltages for all three motors was 46 volts, when the motors stalled (and again there was a high pitch hum) the voltage went up to 60 volts and the fan on the power supply was operating.

Additional Information:
So, the driver work individually, but not all together. There is a high pitch sound when the motors fail. You have noted 60 volts from the power supply and the supply fan remains on. This is a difficult issue to resolve, but it seems to me that your power supply may be bad. The 60v measurement tells me that the current dropped and ohms law tells us that is current drops, volts will rise if the resistance stays the same.

Additional Information:
As one last test I am going to test each driver again and let them go through the entire program because it seems that the failure can occur at the beginning or towards the end of the program. When I originally tested ach driver I let them run for about a half an hour and the program takes over an hour to run completely. I just want to make sure that it is not the drivers. I will report back when I finished but as you noted it may be the power supply but I want to make sure.

Additional Information:
That’s a great idea.

Additional Information:
I just ran the x-axis through the whole program and there was no problem especially since I have two NEMA 23 motors moving that axis. Before I check the Y and Z could having a NEMA 34 on the Z axis with appropriate controller be a problem. I used the larger motor on the z axis because the router I am using is a large 1 1/2 hp. I've run this program in the past with this set-up and have not had a problem.

Additional Information:
Having a, say 3.0 amp driver, driving a stepper motor that typically requires a 6 amp driver would not seem to be an issue since the driver is limiting the current draw, but the driver may not be able to handle larger coil and back EMF with the protection on the 3.0 amp driver. With that said, I don’t believe that is the issue in this case.

Additional Information:
I don't either because I was able to run this and other complicated programs with this set-up in the past. I will let you know on the y and z axis.

Additional Information:
Thanks

Additional Information:
I ran the Y axis and z axis separately through the entire program and there was no stopping or problem. I guess the culprit is the power supply and I'll order a new one and hope that resolves the problem.

Additional Information:
Yes, that is the most probable cause. Please keep me informed. Thanks!

Additional Information:
Received and installed the new power supply. I ran the program with the router on and it worked flawlessly. The program runs for an hour and a half and I did not have a single problem. I guess it was the power supply but I was glad to go through all the diagnostics we discussed before replacing it. I hope this power supply lasts a lot longer than the last one. Thanks much for hanging in there with me and coming up with the solution.

Additional Information:
It’s my absolute pleasure and I am so happy to hear that the power supply replacement solved the problem.

Click the link to respond:
WHAT CAUSES ONE OF MY TWO AXIS MOTORS TO STOP WHILE THE MACH3 PROGRAM IS STILL RUNNING

• What type of alignment screw is used in the mirrors for the Black-tooth. Diameter/threads would be cool. a PN would be fantastic. thanks!

The only screws that do not seem to be proprietary that may be able to be replaced are:

There are M4 X 13mm screws in the Laser Head Mirror ad Lens Holder Nozzle assembly

and

There are M3 X 8mm screws in the Mirror Holder/Mount for 20mm Mirror

The rest of the screws seem to be a very fine threaded metric based screw with a thumb screw for position locking.

• What causes one of my two x-axis motors to stop while the Mach 3 program is still running?

If one of your stepper motors decides to stop moving and the others are moving during a CNC milling or laser cutting job, then there could be two things that could be causing this.

- The motor found its limiting torque (usually comes with a not-so-pleasant sound). This is where the control software is trying to move the stepper motor too fast (velocity, or too fast too quickly, acceleration) and the load against the stepper motor (inertia of the machine, or the material against the end mill while milling). Recommended action is to lower the velocity and/or acceleration, and/or lower the feedrate when cutting.

- There is a wiring issue with the wiring from the driver to the motor. This could be a loose wire, or a chafed wire (or two shorting together). It can also be a loose digital wire from the controller board to the driver. Sometimes wire ties can be the culprit. Recommended action would be to thoroughly inspect the wiring.

It's probably not the limit switches since that would cause a stop to the entire motion of the cnc router or laser machine.

Sometimes Mach3 will show a status when something goes wrong, but in cases where the motor is stopping due to its torque limit, then that would not be shown in the status. It's always good to check it anyway.

Additional Information:
I need to clarify my situation a little better after going to my shop and trying to run another program on Mach 3. About 15 minutes into the milling process all the motors (2-X axis, Y axis and Z axis)stop but the program continues to run. I stop the program and after a couple of minutes when I try to restart the program all the motors start working again. Then after another 15 minutes or so, all the motors stop again. I checked and rechecked my wiring. This has never happened to me before when running the same programs with the same setups and motor speeds. All of a sudden when I reloaded a program I successfully used before it does this. Do you have any recommendations?

Additional Information:
Yeah, it sounds like a more complex issue. Have you tried running in the air without using the spindle. This may be a power related issue.

Additional Information:
That's exactly what I did. I ran the program without the router motor on just to see if the motors would get through the whole program but they stopped working after about fifteen minutes and then I was able to start them again after about 3 or 4 minutes. I never had this problem before so you can imagine my frustration especially after ruining a couple of projects on expensive material.

Additional Information:
Sure. I can completely understand. Try this: disconnect all but one of the driver from power and digital connection and do the air run. Repeat this for each driver and note your findings. This will rule out the drivers causing a power failure.

Also, is your stepper motors and drivers on a separate power circuit from the computer?

Additional Information:
I will try disconnecting each driver and digital connection, which will be a real pain because it will be hard to access.

All the stepper motors, drivers and computer are plugged into the same power strip.

Additional Information:
Ok, so there is no power failure going on, but I believe it is necessary to test each stepper motor and driver pair individually. Hopefully that will lead to a conclusion.

Additional Information:
It will take a little time but I will do it and report back on my findings.

Additional Information:
Curious, what machine is exhibiting this problem?

Additional Information:
I purchased a BYCNC kit back in 2009 with an approximate cutting area of 2' X 4'. I later changed out the Z-Axis Motor and controller for a larger one and have two X-axis motors and controllers. In 2010 I rebuilt the machine out of birch plywood instead of the particle board that the kit supplied. I sent Patrick pictures to him. The machine never gave me a problem till now.

Additional Information:
Thanks for the update. This is Patrick by the way. I answer pretty much all of the Customer Service questions. That machine has given quite a good history.

Additional Information:
I love the machine and made a number of samples of my work for my e-commerce site, but I can't start selling product until I know this problem is solved because I will not be able to fulfill orders. I finally got all the electronics out of its enclosed protected area near the machine so that I test each controller as you recommended. I hope the problem can be rectified. Will let you know.

Additional Information:
Thanks.

Additional Information:
I tested each stepper motor and driver pair individually and they worked so what might be the next step?

Additional Information:
Did each stepper motor driver pair work for the full +15 minutes?

Additional Information:
Yes, I had them in operation for over 30 minutes.

Additional Information:
Ok, well it’s good that the motors and driver are ok. We are now down to the power supply and the breakout board as possible causes for the stop. I have a feeling it may be the power supply where with all three drivers drawing current and the power supply maybe getting too hot. Is the fan in the power supply working? You can also test to see if there is 36 volts on the power supply voltage output (V+ and V-).

Regarding the breakout board, if you have an oscilloscope, you can test if the driver pulses are outputting, but I would consider this as a last resort after you determine if there is a problem with the power supply.

Additional Information:
I tested the power supply with a voltmeter and each output was registering 39-40 volts. I think the problem may be the g-code. I am using V-Carve pro to do design and output to Mach 3 Mill g-code. When I studied the g-code lines I noticed that further into the program the z-axis g-code stopped zeroing out to move to the next part of the carving. In other words both the x and y keep moving and the z just stopped working because there was g-code missing. I think something is missing when the design was converted to g-code. I noticed that when I ran a simpler project it worked without problems so I need to investigate this further.

Additional Information:
New Update, Its not the g-code. I started to run the long program and everything was working fine until about 45 minutes into it, all the motors stopped working (but the program was still running) and there was a high pitched hum. When I put my hands on the motors they were all trying to move but it seemed they were all stalled. I turned the power off, gave it a minute and when I turned it back on I was able to move the motors again. Could this be a power supply problem?

Additional Information:
It does sound more and more like a power supply problem. Did you test the power supply after the motors stopped?

Additional Information:
No, I did not. What should I be looking for.

Additional Information:
It’s good that you know the voltage during normal operation, so you have a base understood. If the power supply is the problem, the voltage will be reduced or non existent when measured after the problem.

Additional Information:
Also, check to see if the fan is running on the power supply when the motors stop. That may (not absolutely) be an indication.

Additional Information:
I'll run another test, check the voltage and fan when the problem occurs and let you know. Thanks for hanging in there with me as we try to resolve the problem.

Additional Information:
It’s my pleasure. This service is rarely used and is faster then email. Odd nobody uses it. Any recommendations you can give would be great. No problem using this FAQ to pose ideas as this resolution will be cleaned up later.

Additional Information:
It might be that people do not realize you can communicate through the sight like this because they are so used to e-mail and texting. You may want to explain this feature in the customer service section.

I ran the program this morning and it did not take long before the motors stopped. While operating the voltages for all three motors was 46 volts, when the motors stalled (and again there was a high pitch hum) the voltage went up to 60 volts and the fan on the power supply was operating.

Additional Information:
So, the driver work individually, but not all together. There is a high pitch sound when the motors fail. You have noted 60 volts from the power supply and the supply fan remains on. This is a difficult issue to resolve, but it seems to me that your power supply may be bad. The 60v measurement tells me that the current dropped and ohms law tells us that is current drops, volts will rise if the resistance stays the same.

Additional Information:
As one last test I am going to test each driver again and let them go through the entire program because it seems that the failure can occur at the beginning or towards the end of the program. When I originally tested ach driver I let them run for about a half an hour and the program takes over an hour to run completely. I just want to make sure that it is not the drivers. I will report back when I finished but as you noted it may be the power supply but I want to make sure.

Additional Information:
That’s a great idea.

Additional Information:
I just ran the x-axis through the whole program and there was no problem especially since I have two NEMA 23 motors moving that axis. Before I check the Y and Z could having a NEMA 34 on the Z axis with appropriate controller be a problem. I used the larger motor on the z axis because the router I am using is a large 1 1/2 hp. I've run this program in the past with this set-up and have not had a problem.

Additional Information:
Having a, say 3.0 amp driver, driving a stepper motor that typically requires a 6 amp driver would not seem to be an issue since the driver is limiting the current draw, but the driver may not be able to handle larger coil and back EMF with the protection on the 3.0 amp driver. With that said, I don’t believe that is the issue in this case.

Additional Information:
I don't either because I was able to run this and other complicated programs with this set-up in the past. I will let you know on the y and z axis.

Additional Information:
Thanks

Additional Information:
I ran the Y axis and z axis separately through the entire program and there was no stopping or problem. I guess the culprit is the power supply and I'll order a new one and hope that resolves the problem.

Additional Information:
Yes, that is the most probable cause. Please keep me informed. Thanks!

Additional Information:
Received and installed the new power supply. I ran the program with the router on and it worked flawlessly. The program runs for an hour and a half and I did not have a single problem. I guess it was the power supply but I was glad to go through all the diagnostics we discussed before replacing it. I hope this power supply lasts a lot longer than the last one. Thanks much for hanging in there with me and coming up with the solution.

Additional Information:
It’s my absolute pleasure and I am so happy to hear that the power supply replacement solved the problem.

Click the link to respond:
What causes one of my two x-axis motors to stop while the Mach 3 program is still running?

• Do you sell acme 1/2-8, 8 start antibacklash nuts and thread clamps?

We currently do not have that specific antibacklash nut available for sale. Please check back regularly since we are always updating our stock, and finding new items to add to our current stock regularly.

Additional Information:
3/8 8start

Click the link to respond:
Do you sell acme 1/2-8, 8 start antibacklash nuts and thread clamps?

• Is the shaft diameter of the NEMA 23 motor 1/4 inch?

The NEMA 23 425-oz in. motor has both input shafts at a 1/4".

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Is the shaft diameter of the NEMA 23 motor 1/4 inch?

• What are the other two dimensions of the 1/2" ID bearings used to support lead screws?

Inside Diameter: 1/2" (actual dimension 0.4975 inches or 12.63 mm)

- Outside Diameter: 1.122 inches or 28.4988 mm

- Thickness: .31 inches or 7.89 mm

Thank you for this question as it caused me to update the description:
https://www.buildyourcnc.com/item/bearing-!5-standardbearing

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What are the other two dimensions of the 1/2" ID bearings used to support lead screws?

• What is the dimensions and material of the spine on your Strip brushes?

The strip brush is .2 inches (5.23 mm) wide, so a slot of that width or slightly wider will work. We use a .25 inch groove and use glue to adhere the strip brushes in our dust shoe.

The material of the bristles and the strip that holds the bristles are nylon.

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What is the dimensions and material of the spine on your Strip brushes?

• What is the pinout of the 12-pin keyboard jog header on the V2.1 CNC USB controller?

The pinout of the USB interface's keyboard job interface can be found here at the usb interface page:
https://www.buildyourcnc.com/item/electronicsAndMotors-electronic-component-USB-Controller-Breakout#prettyPhoto/2/

Scroll down to the instructions below the description and it's the first instruction step. Click on the picture. Just copy and paste that link into the address bar and the diagram should appear.

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What is the pinout of the 12-pin keyboard jog header on the V2.1 CNC USB controller?

• What is the complete list of items (BOM) w/o electronics that ship with the greenbull cnc?

A generalized list of what comes with the machine is on the product description page. A full packing list will come with the order, so that you can check for missing parts. We can not provide a full, detailed, list of parts without an order. If you have ordered from us, and your packing list is missing, you can contact us by email, providing us with the name you ordered under, and we will send a copy to you through email.

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What is the complete list of items (BOM) w/o electronics that ship with the greenbull cnc?

• What software is needed to run the laser controller from the PC?

The laser controller uses software called LaserCAD. You can find the link to the LaserCAD software on the Laser Controller product page:

https://www.buildyourcnc.com/item/Laser-Component-Laser-Control-System

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What software is needed to run the laser controller from the PC?

• What are the overall dimensions of the USB interface board? Is there a CAD model available?

The dimensions for our USB breakout board are:

L: 2.745"/ 69.723mm
W: 2.244"/ 56.9976mm
H: .501"/ 12.7254mm

Currently we do not have a CAD model on hand.

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What are the overall dimensions of the USB interface board? Is there a CAD model available?

• What is the height/cutting of the z axis on the green lean 4x8

At the highest z position, the measurement from the collet of the spindle is 6-1/4" (158.75 mm) from the spoilboard. The spoilboard is 3/4" measured from the rib that is rests on.

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What is the height/cutting of the z axis on the green lean 4x8

• The Data Sheet for 3/8 anti-backlash nut isn't showing up on website. Can you e-mail me or repost on website?

The 3/8" anti-backlash nut mates with our leadscrew (https://buildyourcnc.com/item/mechanical-leadscrews-lead-screw-!375-2-starts-10-tpi) where you will find the datasheet (mounting dimensions) for the antibacklash nut.

• The Data Sheet for 3/8 anti-backlash nut isn't showing up on website. Can you e-mail me or repost on website?

The 3/8" anti-backlash nut mates with our leadscrew (https://buildyourcnc.com/item/mechanical-leadscrews-lead-screw-!375-2-starts-10-tpi) where you will find the datasheet (mounting dimensions) for the antibacklash nut.