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### Question #: 13579

Question: What is the cut accuracy of the large format routers using roller chain? .005"?

Current Solution

Accuracy is generally function of how well the machine will match the measurements of what is designed on a computer on a computer. However, if you are looking for the resolution of the machine, you can calculate the steps per inch using the formula:
Steps / inch
= ((motor steps) * (micro steps)) / ((tooth pitch) * (number of teeth))

Depending on the micro steps and the drive sprocket (or drive pulley) you are using, you can achieve a wide range of resolutions.

With our machines, you can easily achieve .001 resolution, but accuracy will be best achieved with proper calibration.

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### Other Possible Solutions to this Question

• IS THE "#25 ROLLER CHAIN" ADJUSTABLE TO ANY LENGTH? LIKE IF I ORDERED TEN FEET OF IT, CAN MAKE TWO 3-FOOT LOOPS AND ONE 4-FOOT LOOP USING SOME SORT CHAIN JOINER?

Roller chain in general is adjustable by using "master links", which are links which have horseshoe clip holding the pin and thus allow connections to be made or broken. The #25 is a designation of the type of roller chain. ANSI codes designate that the first digit(s) specify the pitch in eights of an inch, and the last digit is 0 for standard chain, 1 for lightweight chain, and 5 for bushed chain with no rollers. So #25 is 2/8 = 1/4 inch pitch bushed chain with no rollers.

• When using the laser controller, what does "engrave beyond border limit" mean?

LaserCAD: Engrave beyond border limit.

This is caused by a sweeping motion that is too fast and where the acceleration is too slow. My recommended action would be to keep the acceleration the way it is and slow down the speed of the engrave sweeping motion. I typically use around 200-300 mm/sec and make sure that the axis sweep motion is the nozzle along the gantry, not the gantry itself. The gantry will have too much inertia to sweep, but the nozzle is very light and can sweep very quickly.

Specifically, what is happening with the engrave beyond border limit is where that axis is not able to slow down fast enough to not hit the border. For instance, imagine a car going 100 mph and it needs to stop within 30 feet. This would not be possible because the deceleration is not high enough.

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When using the laser controller, what does "engrave beyond border limit" mean?

• What do I do if I didnt recieve the y-axis rails, z-axis rails, or the roller chain for my bluechick (rollerchain)?

Please contact us at customerservice@buildyourcnc.com so we can get the customer order # and customer info so we can send the replacements right away!!

• Is the "#25 Roller Chain" adjustable to any length? Like if I ordered ten feet of it, can I make two 3-foot loops and one 4-foot loop using some sort of chain joiner?

Roller chain in general is adjustable by using "master links", which are links which have horseshoe clip holding the pin and thus allow connections to be made or broken. The #25 is a designation of the type of roller chain. ANSI codes designate that the first digit(s) specify the pitch in eights of an inch, and the last digit is 0 for standard chain, 1 for lightweight chain, and 5 for bushed chain with no rollers. So #25 is 2/8 = 1/4 inch pitch bushed chain with no rollers.

• I am building a cnc mill using your USB controller and i would like to know what is the specification of potentiometer used for adjusting manual axis jog speed

Dealing with our USB BoB, the potentiometer that will be used in the key jog, is a 5V, 5k - 10k Ohm potentiometer.

• How do you zero the z axis using a plate with the planet-cnc software and your USB controller?

The instructions on how to use a plate for z-axis homing (moveable sensor) can be found here:

http://www.planet-cnc.com/faq/moveable_sensor/

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How do you zero the z axis using a plate with the planet-cnc software and your USB controller?

• 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 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?

• My stepper motors are randomly and frequently stalling while using the Pokeys57CNC controller board, any idea what could be the issue?

I would suspect that the velocity and/or acceleration is too high for the amp setting on the driver. Consider increasing the current amp setting on the driver is the motor can handle the current, or decrease the velocity and/or acceleration.

You might also want to check to see if you have any mechanical binding on the machine. To check, remove the mechanical drive mechanism so the axis slides freely and slide it from end to end to feel if you have any tight areas or binding.

• What is the largest thickness of material that the BlackTooth can accomodate

A standard 40W CO2 laser will cut up to 1/4" thick of material, be it wood, acrylic, card stock, leather, fabric, foam, cork, etc. (Decent speed and final cut are heavily dependent on a strong air assist upgrade)

Metals cannot be cut due to the power level and wavelength of the CO2 laser. But it can be marked with special solutions like Cermark or Thermark.

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What is the largest thickness of material that the BlackTooth can accomodate

• What is better: Roller Chain/timing Belt or Lead Screw?

Lead screw is the rotational translation to linear motion driven by a screw using a stepping motor to turn the screw. Lead screw has the potential to have high resolution but can exhibit backlash in many places in the mechanism, especially through temperature change. Roller chain is the translation of motor rotation to linear motion by means of turning a sprocket or drive pulley on a roller chain or timing belt. The roller chain or timing belt is always in tension, so backlash through this specific mechanism is minimal to none. Since there is extremely little to no backlash, microstepping will enhance the resolution and meet or exceed the effective resolution of the lead screw. Roller chain or timing belt also allows the motor to use low RPM which increases the torque at any given speed as compared to the lead screw.

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What is better: Roller Chain/timing Belt or Lead Screw?

• If I wanted to use the blueChick for isolation routing, what accuracy could I expect from v3.0 and v4.2?

The blueChick v4.2, is accurate at 1000's of an inch, with the roller chain, the v3.0 with the timing belt will increase the accuracy by 5%-10%, but to the expense of structural integrity.

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If I wanted to use the blueChick for isolation routing, what accuracy could I expect from v3.0 and v4.2?

• how long is the build time for a black toe 2x4 roller chain router and shipping time to ny?

All of our machines are a week lead time, other than the greenLean which is 2 weeks. Depending where your current location is,shipping will take anywhere from 1 week in the US, 1-5 weeks over seas.

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how long is the build time for a black toe 2x4 roller chain router and shipping time to ny?

• What is the wiring configuration for limit switches on the laser controller?

If you are using the AWC708 or equivalent laser controller, the limit switches will connect between the EL input terminal and the GND terminal in normally open (NO) connection. Most limit switches can be connected as NO, or normally closed (NC).

For instance, a limit switch for the X- limit will be connected from the ELX- terminal to the NO connection of the limit switch, then a connection from the GND terminal on the laser controller to the COM connection to the same limit switch.

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What is the wiring configuration for limit switches on the laser controller?

• What is your largest format cnc router

The largest CNC machine we make at this time (12/04/2015) is the GreenBull 6'x12' model. This model has 2 options for Z-axis travel.

The short-z option has a total Z travel of 5.75 inches. From that you would subtract the length of the end mill used and the thickness of the spoil board to determine the maximum material thickness. (Example: If the end mill extends 1.25" from the collet and the spoil board is .75", then the material could be up to 5.75 - 1.25 - 0.75 = 3.75 inches in thickness). This is good for most sheet-type materials.

The long-z option, used mainly for large 3D carvings, requires a custom frame and allows for up to 36" of travel.

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What is your largest format cnc router

• What tolerance can I expect from your largest cnc machine and the laser cutter? Also, what depth can I get on the z axis?

The largest CNC machine we make at this time (12/04/2015) is the GreenBull 6'x12' model. This model has 2 options for Z-axis travel.

The short-z option has a total Z travel of 5.75 inches. From that you would subtract the length of the end mill used and the thickness of the spoil board to determine the maximum material thickness. (Example: If the end mill extends 1.25" from the collet and the spoil board is .75", then the material could be up to 5.75 - 1.25 - 0.75 = 3.75 inches in thickness). This is good for most sheet-type materials.

The long-z option, used mainly for large 3D carvings, requires a custom frame and allows for up to 36" of travel.

The tolerance of our machines, like any machine, depends on several variables. The major variables include the manufacturing tolerance, the type of machine control used, the precision of assembly, the thoroughness of maintenance, and the initial and ongoing calibration of the machine. Because we sell kits only most of these variables are outside our control. Therefore, we are hesitant to guarantee a certain level of tolerance for an end user. However, in our experience, tolerances of .001" are readily achievable with our machines.

• what are the dimensions and model number of the 3/8" ID roller bearings on your website?

The specifications for our 3/8" bearings are R6ZZ. The ZZ means double metal shielded. The metal shielding is to protect the ball bearings between the inner race and outer race.

Inside diameter: 3/8"
Outside Diameter: 7/8"
Width: 9/32"

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what are the dimensions and model number of the 3/8" ID roller bearings on your website?

• How do we attach the roller chains with the optional table? The eyebolts don't seem to fit properly. Why is there no documentation of this?

A good example of how to install the chain to the eyebolts can be seen on the instruction number 76 on this page: https://www.buildyourcnc.com/Item/cnc-machine-blackFoot-v4

• What is the max thickness of material that the 80W laser can cut in plywood?

An 80 watt laser can cut plywood up to 1/2 inch thick. Make sure to use a high pressure source of air to knock out all of the charring during the cutting process so the laser can work efficiently.

I have a Chinese 80W laser. Just finished a cut test with 1/2" plywood. It cut through at 95% power 7-4mm/s with significant charring after two passes with no refocusing done between passes.

That's great information. What is your PSI of the air assist on your laser? What focal lens distance do you have? And where did you place the focus of the lens (at the surface, or within the material)?

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What is the max thickness of material that the 80W laser can cut in plywood?

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