### Question #: 967

Question:
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What is the longest 1/2" Acme lead screw that I can buy?
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**We can supply 1/2" lead screw with a maximum continuous length of 77 inches.Additional Information:Please give me a cost on a 6'x 1/2" lead screw. Thank youAdditional Information:no
Additional Information:what is the total cost for 77 inches of 1/2 inch lead screw?**

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### Other Possible Solutions to this Question

**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! (

)**Click the link to respond:**

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.**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.

**Click the link to respond:**

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.**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.**Click the link to respond:**

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**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.

Additional Information:

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

Can 3/8" lead screw be used instead of 1/2" on the 'BOOK' machine?**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**Click the link to respond:**

What are the other two dimensions of the 1/2" ID bearings used to support lead screws?**Hi, I need the lead screw and bearings for x/y/z axis of the CNC. What is the length of "1/2" Lead Screw per inch (Steel)"?**Depending on the size of your CNC machine, it will vary the length required for your application.

Please verify the CNC machine, and we can go into detail on the specific lengths or methods for the linear guide mechanics.

We sell our ACME Screw (1/2" per inch), also our longest length of ACME Screw is 76-3/4".**Click the link to respond:**

Hi, I need the lead screw and bearings for x/y/z axis of the CNC. What is the length of "1/2" Lead Screw per inch (Steel)"?**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)

R = radius of the lead screw

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

Additional Information:

Additional Information:

Additional Information:

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

Additional Information:

Pls

Additional Information:

1m 16mmdiameter ball screws calculations**Click the link to respond:**

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.**I want to buy a 59-inch acme screw, how many units is that?**When ordering our ACME lead screws, you will enter the total length required in the quantity box. Note that it is sold in inches and the highest single length available is 78". We can cut any size to your specifications. If you require separate lengths, please order the total quality and then email us with your specific lengths desired.

Email: customerservice@buildyourcnc.com (for length requests with purchased orders)**Click the link to respond:**

I want to buy a 59-inch acme screw, how many units is that?**If I buy the 1/2" 5 start lead screw and the 3/8" 5 start lead screws will it all work together**If the turns per inch on a lead screw is different, then the nut on the lead screw will move at a different velocity.

Additional Information:

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.**Click the link to respond:**

If I buy the 1/2" 5 start lead screw and the 3/8" 5 start lead screws will it all work together**What is the tolerance on your 1/2" acme thread?**The tolerance of our 1/2" 5 start lead screw is +/-0.05mm

**Click the link to respond:**

What is the tolerance on your 1/2" acme thread?**I need the calculation to determine the stepper motor torque to find the load that it can withstand in horizontal position 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)

R = radius of the lead screw

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

Additional Information:

Additional Information:

Additional Information:

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

Additional Information:

Pls

Additional Information:

1m 16mmdiameter ball screws calculations**Click the link to respond:**

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

Additional Information:

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.**Click the link to respond:**

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.

Additional Information:

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.**Click the link to respond:**

Will the 1/2" 5 start lead screw and the 3/8" 5 start will it all work together in unison**when buying 1.5m of 1/2" Lead Screw per inch (Steel) does it ship as a whole rod or do i need to specify what lengths i need?**When buying any of our ACME screws, if the entire length or lengths is desired please send us an email or a call, to specify the actual length needed! But if no call or email is sent previous of the order then, we will give the customer a call or email to find the exact lengths that they will require.

**Click the link to respond:**

when buying 1.5m of 1/2" Lead Screw per inch (Steel) does it ship as a whole rod or do i need to specify what lengths i need?**With a 1/2 lead screw what is the optimal steps for the stepper motor driver 1/16, 1/8, 1/4 etc**We typically use a 1/4 microstepping for lead screws, but you want to determine the microstepping only after you determine what resolution you want on that axis of the machine.

The formula:

Resolution is steps per inch or steps per milimeter

I will go over this using steps/inch:

steps = motor steps x driver microstepping

inch = the amount of travel with one full stepper motor rotation

In the case of our 1/2" 5 start 10 TPI lead screw, the axis will travel .5 inches with one stepper motor rotation.

Let's use 1/4 microstepping (4 microsteps for each stepper motor step)

Therefore:

(200 steps x 4) / .5 inches =

800 steps / .5 inches =

1600 steps/inch

Now let's use 1/2 microstepping (2 mistrosteps)

(200 steps x 2) / .5 inches =

400 steps / .5 inches =

800 steps/inch

Remember that increasing microsteps, the torque is also reduced, but the smoothness from the motor is increased.**Click the link to respond:**

With a 1/2 lead screw what is the optimal steps for the stepper motor driver 1/16, 1/8, 1/4 etc**On the book build machine I changed the Z axis from a 13 tpi lead screw to an acme 10 tpi 5 start lead screw. What numbers do I put into the motor tuneing boxes.**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! (

)**Click the link to respond:**

On the book build machine I changed the Z axis from a 13 tpi lead screw to an acme 10 tpi 5 start lead screw. What numbers do I put into the motor tuneing boxes.**Is a cahin driven y axis that is six feet feesable? What is the best setup other than ballscrew?**The main reason why we chose a chain driven CNC machine is to keep cost down, and works perfectly! It is also pretty simple to setup, so in your application it is feesable!

We currently have our largest CNC machine (greeBull 6X) which runs roller chain for both the X-axis(12Ft.) and Y-axis(6Ft.).

In longer lengths the Lead Screw, and Ball Screw will be hard to get in those lengths without any bends or having it perfectly straight at a low cost, and maybe be harder to accomplish.

Most larger CNC machines, will have to use rack and pinion for the larger lengths, which will have a more complex assembly.

Both the ball screw and rack and pinion will both run (mostly) on aluminum machines.**Click the link to respond:**

Is a cahin driven y axis that is six feet feesable? What is the best setup other than ballscrew?**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 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.

Additional Information:

Additional Information:**Click the link to respond:**

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