[ Register ]

### Question #: 14063

Question: If I buy the 1/2" 5 start lead screw and the 3/8" 5 start lead screws will it all work together

Current Solution

If the turns per inch on a lead screw is different, then the nut on the lead screw will move at a different velocity.

Let me explain in more detail.

Let's say you have two lead screws:

- 1/2" 5 starts at 10 TPI = 2 turns per inch. (5 starts / 10 TPI = 1/2 inches per turn or 10 TPI / 5 Starts = 2 turns per inch.)

- 3/8" 2 starts at 10 TPI = 5 turns per inch. (2 starts / 10 TPI = 1/5 inches per turn or 10 TPI / 2 starts = 5 turns per inch.)

So, if two stepper motors (one connected to the 1/2" lead screw and the other connected to the 3/8" lead screw) turned 10 revolutions in 2 seconds, the 1/2" lead nut would travel 5 inches and the 3/8" lead nut would travel 2 inches at the 2 second mark.

Respond:

### Other Possible Solutions to this Question

• Will the 1/2" 5 start lead screw and the 3/8" 5 start will it all work together in unison

If the turns per inch on a lead screw is different, then the nut on the lead screw will move at a different velocity.

Let me explain in more detail.

Let's say you have two lead screws:

- 1/2" 5 starts at 10 TPI = 2 turns per inch. (5 starts / 10 TPI = 1/2 inches per turn or 10 TPI / 5 Starts = 2 turns per inch.)

- 3/8" 2 starts at 10 TPI = 5 turns per inch. (2 starts / 10 TPI = 1/5 inches per turn or 10 TPI / 2 starts = 5 turns per inch.)

So, if two stepper motors (one connected to the 1/2" lead screw and the other connected to the 3/8" lead screw) turned 10 revolutions in 2 seconds, the 1/2" lead nut would travel 5 inches and the 3/8" lead nut would travel 2 inches at the 2 second mark.

Will the 1/2" 5 start lead screw and the 3/8" 5 start will it all work together in unison

• Will the 1/2" 5 start lead screw and the 3/8" 5 start will it all work together in unison

If the turns per inch on a lead screw is different, then the nut on the lead screw will move at a different velocity.

Let me explain in more detail.

Let's say you have two lead screws:

- 1/2" 5 starts at 10 TPI = 2 turns per inch. (5 starts / 10 TPI = 1/2 inches per turn or 10 TPI / 5 Starts = 2 turns per inch.)

- 3/8" 2 starts at 10 TPI = 5 turns per inch. (2 starts / 10 TPI = 1/5 inches per turn or 10 TPI / 2 starts = 5 turns per inch.)

So, if two stepper motors (one connected to the 1/2" lead screw and the other connected to the 3/8" lead screw) turned 10 revolutions in 2 seconds, the 1/2" lead nut would travel 5 inches and the 3/8" lead nut would travel 2 inches at the 2 second mark.

Will the 1/2" 5 start lead screw and the 3/8" 5 start will it all work together in unison

• Will the 1/2"5 start and 3/8" 5 start work in unison even though the turns per inch is different

If the turns per inch on a lead screw is different, then the nut on the lead screw will move at a different velocity.

Let me explain in more detail.

Let's say you have two lead screws:

- 1/2" 5 starts at 10 TPI = 2 turns per inch. (5 starts / 10 TPI = 1/2 inches per turn or 10 TPI / 5 Starts = 2 turns per inch.)

- 3/8" 2 starts at 10 TPI = 5 turns per inch. (2 starts / 10 TPI = 1/5 inches per turn or 10 TPI / 2 starts = 5 turns per inch.)

So, if two stepper motors (one connected to the 1/2" lead screw and the other connected to the 3/8" lead screw) turned 10 revolutions in 2 seconds, the 1/2" lead nut would travel 5 inches and the 3/8" lead nut would travel 2 inches at the 2 second mark.

Will the 1/2"5 start and 3/8" 5 start work in unison even though the turns per inch is different

• If I order 19ft of the 1/2" lead screw will it come in three 6'5" lengths by default? This is what I need. Thanks

No they will not come in that length as a default, we would contact the buyer to ask specific lengths due to the total length purchased.

However if you order the 1/2" lead screw we can get them cut to the specific length you require, by contacting us here or call us at 281-815-7701.

If I order 19ft of the 1/2" lead screw will it come in three 6'5" lengths by default? This is what I need. Thanks

• I just changed my X and Y to the ACME 1/2" 5 start lead screw. What are the motor tuning numbers. I have the book built machine.

The settings that will have to be change will be your steps per inch in motor tuning (mach 3), or settings/axes(planetCNC). But we do not have the actual numbers/specs that will fit your 10 TPI 5 start lead screw, here is a tutorial video which explains how to get the exact numbers you need! (

)

I just changed my X and Y to the ACME 1/2" 5 start lead screw. What are the motor tuning numbers. I have the book built machine.

• I want my cnc to move quicker. I want to update my lead screws. will this make my cnc move quicker on all 3 axis. If it would which lead screw is better 2 turns per inch or 5 turns per inch.

Changing your lead screws from a tight to a lose lead will definitely make your machine move faster as long as your stepper motors can handle the new torque that the lead screws will impose.

Here is an example of a speed change from one lead screw to another:
- Existing constants in the example: Stepper Motor steps 200, microstepping 1/8 making the total steps 200 * 8 = 1600.
- New Lead Screw: 1/2" 5 starts, 10 TPI = 10 / 5 = 2 turns per inch

Old lead screw would achieve a steps per inch of:
1600 / (1 inch / 13 turns) = 20,800 steps per inch (You can also express the calculation as 1600 * 13 = 20,800 steps/inch)

New lead screw would achieve a steps per inch of:
1600 / (1 inch / 2 turns) = 3200 steps per inch

You can see that the new lead screw requires far fewer steps to get to the same length of travel. If you maintained the same velocity for both examples, the new lead screw would travel the same distance 13/2 = 6.5 times faster. So, if your velocity was say 10 ipm, your new velocity would be 65 ipm. That would translate to far fewer burned edges and longer end mill life!

Just remember, confirm that your motors will be able to handle the new lead screw. You will need to reduce the steps/inch causing the motor torque to increase quite a bit, so you should be fine.

I want my cnc to move quicker. I want to update my lead screws. will this make my cnc move quicker on all 3 axis. If it would which lead screw is better 2 turns per inch or 5 turns per inch.

• Can 3/8" lead screw be used instead of 1/2" on the 'BOOK' machine?

Yes, you will only need to change the coupling that couples the motor to the 3/8" lead screw.

Yes, you will only need to change the coupling that couples the motor to the 3/8" lead screw.

Can 3/8" lead screw be used instead of 1/2" on the 'BOOK' machine?

• Regarding 1/2" 5 start and 10 TPI ACME precision lead screw, what the maximum length you can ship within USA? I'm looking for something like 100" and I could use a 1" screw if available. Please include estimated price. Thanks.

The maximum length we can ship is a total of 78" inches. However we can send your required length in portions. Please refer to adding the total items you require to your cart to get a visualized amount and shipping cost.

• What is the longest 1/2" Acme lead screw that I can buy?

We can supply 1/2" lead screw with a maximum continuous length of 77 inches.

Please give me a cost on a 6'x 1/2" lead screw. Thank you

no

what is the total cost for 77 inches of 1/2 inch lead screw?

what is the cost of 6 feet lead screw.

What is the longest 1/2" Acme lead screw that I can buy?

• I am having a significant amount of trouble getting the 1/2" ID bearing to fit over the 1/2" 5 start lead screw. I can only get it about half an inch onto the rod. Any tips to get it to slide further?

There should be no problem with getting the 1/2" ID bearing on the lead screw, unless there is a bent in the lead screw or it has a piece of debris that is causing a issue.

Unless one of these items were purchased from a 3rd party, then there might be tolerance issues from the original manufacture which might cause this issue.
If possible please send photos to customerservice@buildyourcnc.com

I am having a significant amount of trouble getting the 1/2" ID bearing to fit over the 1/2" 5 start lead screw. I can only get it about half an inch onto the rod. Any tips to get it to slide further?

• should all three lead screws be a 5 start?

The precision and number of starts for a lead screw will depend on the application. Having an ACME lead screw with 5 starts is a good balance for many applications so the machine will travel quickly along the axes with motors that hold best torque at low RPM. All three axes would benefit from 5 start lead screw for general applications.

should all three lead screws be a 5 start?

• 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

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

Dealing with our 3/8" ACME screw, we intended to use this with a 3D printer machine(primarily) as well as our smaller motors. Which did not need the increased torque ratings as our larger motors, which will use the 1/2" ACME screw with larger machines.

• Does the 5 start lead screw come with any nuts?

Our 5 Start ACME screw is sold by the inch, and sold as a single product. No anti-backlash nuts are sold with the purchase of the ACME screw as the anti-backlash nut is sold separately.

Does the 5 start lead screw come with any nuts?

• If I buy the Combo #1 with hardware, plans for \$255.00 and get all the required parts, will i be able to use with Autodesk 123D?

Yes, you can use the Autodesk123D CNC Utility found here: http://www.123dapp.com/aboutcnc

This utility will work with any standard CNC machine. Our machines use standard electronics and you choose the software that controls the CNC machine.

If I buy the Combo #1 with hardware, plans for \$255.00 and get all the required parts, will i be able to use with Autodesk 123D?

• I need the calculation to determine the stepper motor torque to find the load that it can lift using a lead screw at 1/2" diameter with 13 TPI.

There are two main questions that we can answer with respect to motor torque and the mechanical advantage of lead screws, 1) What torque motor do you need to lift a particular weight, or 2) What maximum weight will my motor torque be able to lift.

This formula uses Newtons (N) as it's final unit. Use this with the included radius (R) to determine the torque. Newtons can easily be converted to lbs or ounces using online conversions.

Effort = Sf + (Load/(2 x pi x (R/p) x Se))

where:
p = pitch of the screw
Se = screw efficiency = Standard lead screw will be between 20% (.2) and 40% (.4)
Sf = static force. This is the force that is needed to start the movement. The number may be eliminated, but it is good to use a number in the 5 N to 20 N range.
Load = the expected load that the effort will need to carry (i.e., the router and the included axis assembly that the motor will need to lift)

This formula is based on the "law of the machine"

The final effort amount with its unit of newtons and R will be the torque. For example, if the effort comes to 100 N (newtons) and the R is .5 inches, then you can assume that the effort is 50 N-in since it would take twice the effort to turn form the one inch mark from the center of the shaft.

Example:

Load = 90 N (20.2 lbs)
R = 1 inch since that is the length from the center of the shaft that the motor is rated
p = 1 inch / 13 = .08 inches

Effort = 5 N + (90 N / (2 x 3.14 x (1 / .08) x .2))
Effort = 5 N + (90 N / (6.28 x 12.5 x .2))
Effort = 5 N + (90 N / (15.7))
Effort = 5 N + (5.73 N)
Effort = 10.7 N = 2.4 lbs = 38.4 oz-in

I am putting the oz-in on the end because the formula considers the distance from the center of the shaft to be one inch.

Therefore, a 425 oz-in motor would be able to lift a 20.2 lb Router with its accompanying assembly. If the assembly and router is heavier, plug in the numbers and determine the effort required.

With a bit of algebra, the formula can be rewritten to find the load:

Load = (Effort - Sf) x (2 x pi x (R/p) x Se)

Another formula that does not consider friction at all:

Effort = (Load x p) / (2 x pi x R)

Lets see if we get similar results:

Effort = (20 lb x .08 inches) / (2 x 3.14 x 1)
Effort = 1.6 / 6.28 = .255 lbs = 4.08 oz-in

The results from both formulas appear to be very small because a 13 TPI screw will have enormous mechanical advantage.

It is evident that the first formula that does consider friction that we are loosely estimating is far more conservative than the second formula. Either way, even the most conservative formula shows that the 425 oz-in motor will handle very large weights. If you are using a lead screw with only two turns per inch, .5 inch pitch, you can determine the requirements with the first formula.

Example for a 10 TPI 5 start (2 turns per inch) lead screw:

Load = 90 N (20.2 lbs)
R = 1 inch since that is the length from the center of the shaft that the motor is rated
p = 1 inch / 2 = .5 inches

Effort = 5 N + (90 N / (2 x 3.14 x (1 / .5) x .2))
Effort = 5 N + (90 N / (6.28 x 2 x .2))
Effort = 5 N + (90 N / (2.512))
Effort = 5 N + (35.83 N)
Effort = 40.828 N = 9.18 lbs = 146.88 oz-in

Customer Response:
thank you so much

how do i calculate torque of stepper motor if lead screw coupled to motor shaft and load applied by lead screw on plate is 100 kg by vertically

Pls

1m 16mmdiameter ball screws calculations

What is the max load that 2 NEMA 17 stepper motors (spaced 2 feet apart, both will be pushing up on the same gantry) can lift while using a rod with the following specifications T8 OD 8mm Pitch 2mm Lead 4mm for each motor.

1

I need the calculation to determine the stepper motor torque to find the load that it can lift using a lead screw at 1/2" diameter with 13 TPI.

• looking for 5 start lead screw 3/8 4 feet long i need 2 of them

We currently only stock 2 start lead screw for the 3/8".

looking for 5 start lead screw 3/8 4 feet long i need 2 of them

• I am running 2 pokeys 57 devices on mach3, and apparently the e-sops are conflicting. Is ther a way to disable one or get them to work together?

I am posing this question to the PoLabs folks. I will provide a respons when they get back to me. Thanks for the patience.

Polabs response: The E-stop MUST be connected to the device that is used as the motion device.

Here is more elaboration from PoLabs and a question regarding the need for multiple devices:
Although the PoKeys plugin for Mach3 supports multiple PoKeys devices, only one device can be a motion controller. Since, PoKeys57CNC is always configured as motion controller by the plugin, there shouldn't be more than 1 PoKeys57CNC used by the plugin at a time.
May I ask you about the application and why there is a need for multiple PoKeys57CNC devices?

I am running 2 pokeys 57 devices on mach3, and apparently the e-sops are conflicting. Is ther a way to disable one or get them to work together?

• I just ordered a 1/2" lead screw and bearings, etc. But I don't see any 1/2" shim washers for those bearings. If you have any, please toss 8 of them in the shipment and I'll gladly reimburse you.

We will provide shim washers as a part of machine assemblies, but when purchasing lead screw and bearings, the shim washers must be purchased as well. Please give us a call and we can send them out.

I just ordered a 1/2" lead screw and bearings, etc. But I don't see any 1/2" shim washers for those bearings. If you have any, please toss 8 of them in the shipment and I'll gladly reimburse you.

Get Help with:
This Product
Orders
Tech Support
Sales
This Product
Order Query
Tech Support
Sales