### Question #: 978

Question:
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How do I order a pacific length of lead screw?
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**Just specify the full length in the quantity field in the shopping cart and give us a call to inform us of the cut lengths (you can also email customer service - link in the contact us page - link at the footer). We are working on a way to do this at the product page, but won't be finished for a few more days.Additional Information:20**

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### Other Possible Solutions to this Question

**How do I order specific lengths of lead screws in one order?**Just specify the full length in the quantity field in the shopping cart and give us a call to inform us of the cut lengths (you can also email customer service - link in the contact us page - link at the footer). We are working on a way to do this at the product page, but won't be finished for a few more days.

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20**Click the link to add information to this solution:**

How do I order specific lengths of lead screws in one order?**How do I keep the lead screw from moving back and forth?**The lead screw needs to be stabilized axially. The lead screw should turn, but not move any other way. The method to keep the lead screw stable is to use two bearings with ID (inside diameter) that match the diameter of the lead screw. The bearings are positioned before and after a stable structural part. A collar is positioned at one side of the bearing assembly and another collar, or end of a coupling is positioned at the other side of the bearing assembly.

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How many times do you need to turn the handle to move the lead screw 1 inch?

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For our 5 start 10 tpi, the lead nut will travel one inch with two turns of the lead screw.**Click the link to add information to this solution:**

How do I keep the lead screw from moving back and forth?**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 add information to this solution:**

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)"?**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 add information to this solution:**

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**how do I get the status of my order?**If you are needing a status of an order that you purchased from us, you can either log-in and click on the "My Account" link at the top, or call us at 281-815-7701.

The "My Account" link will contain all of the orders and tracking numbers associated with those orders. If the order does not contain a tracking number, call us to get a status of the order. In most cases, we will call you first if there is a backorder in our inventory.**Click the link to add information to this solution:**

how do I get the status of my order?**How do I configure my control program (i.e. Mach3, EMC2, etc.) for lead screw steps per inch?**You will first need to derive the number of turns per inch that your lead screw produces. If there is only a single start (typical all thread screws), then the turns per inch is the same as TPI (threads per inch). If there is multiple starts, then the number of starts is divided by the TPI to determine the turns per inch. For example, 10 TPI with 5 starts is 10 / 5 = 2 turns per inch. Now that we know this, we can get the number of steps per inch as described in the previous question: take the number of steps per revolution that the motor will output. This will be the number of full steps that you motor produces (typically 200, or 1.8 degrees per step) multiplied by the microstepping per step to which the driver is configured. Simply multiple the number of turns per inch and the number of steps per revolution and you will get the steps per inch. Ok, lets see the formula:

200 steps * 16 microsteps * 2 turns per inch = 6400 steps per inch

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14798

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hallo i have cnc with ball screw 2.5mm of pith..n driver stepping 1/16 how to setup step value

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i have ball screw with 2.5 mm of pith n 1 start motor 200 step 1/16 driver stepping

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How do I configure my control program (i.e. Mach3, EMC2, etc.) for lead screw steps per inch?**WHAT LENGTH OF CABLE DO I NEED FOR A BLAKCFOOT**The blackfoot requires a total of 50 feet of cable.

The X axis needs 15 feet

The Y axis needs 17 feet

and the Z-axis needs 18 feet

These are 20 gauge 4 conductor cable.

Additional Information:**Click the link to add information to this solution:**

WHAT LENGTH OF CABLE DO I NEED FOR A BLAKCFOOT**how do I order multiple lengths of HIWIN guide rail with blocks?**Select the desired rail here:

https://buildyourcnc.com/Item/mechanical-rails-HIWIN-Linear

On the product page, enter the total "cut to order" length (in inches). Then call us to specify the cut lengths. Remember that our maximum length is 2000mm or 78.74 inches.

Our phone number is located at the top right of each web page by hovering over the "Need Help?".**Click the link to add information to this solution:**

how do I order multiple lengths of HIWIN guide rail with blocks?**HOW DO I DETERMINE THE AMOUNT OF SCREW WEIGTH THAT MY MOTOR CAN HANDLE**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

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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

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Pls

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1m 16mmdiameter ball screws calculations

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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.

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1**Click the link to add information to this solution:**

HOW DO I DETERMINE THE AMOUNT OF SCREW WEIGTH THAT MY MOTOR CAN HANDLE**How do I enter tax exemption for my order?**Dealing with Tax Exemption forms, please refer to contacting us at customerservice@buildyourcnc.com

Additional Information:**Click the link to add information to this solution:**

How do I enter tax exemption for my order?**Does "Additional Length" for the Lead Screw mean Additional Length in inches? So for the 4' x-axis I have to choose Additional Length=52?**When you add a specific length to your cart, the additional length will be in inches.

So you will need to add the total length which will be 98" in total!

If this is for the scratch build kit (book CNC) the total length (98") of lead screw you will need for this machine is the three axes added together:

X-axis: 52"

Y-axis: 32"

Z-axis: 14"

You will have to specify the dimensions you require by sending a email (with your order details) or call to: customerservice@buildyourcnc.com or 281-815-7701**Click the link to add information to this solution:**

Does "Additional Length" for the Lead Screw mean Additional Length in inches? So for the 4' x-axis I have to choose Additional Length=52?**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.

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

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no

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

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what is the cost of 6 feet lead screw.**Click the link to add information to this solution:**

What is the longest 1/2" Acme lead screw that I can buy?**I couldn't find any information about how to mount the "z-axis lead screw in the book" (Build Your Own CNC)**The details will differ depending on the type of lead screw you use.

For allthread lead screws, you will need the 1/2" square nut, 1/2" allthread lead screw, two 1/4" screws and nuts to hold the square nut in place, two 1/2" ID bearings, two standard 1/2" nuts, and one coupling hub.

Attach the square nut to the nut support using the two 1/4" screw and nuts. The bearings will need to be inserted into the seats of the lower and upper part of the z-axis. Insert the lead screw through the top bearing. Use one of the standard 1/2" nuts and start threading it on the allthread screw just below the bearing. Lower the lead screw to the square nut and start to screw the lead screw into the square nut. Continue until the screw is near the lower bearing. Add another standard 1/2" nut to the screw and keep turning the screw until the screw just passes the lower bearing. Add the coupling hub to the top of the screw just above the upper bearing. Turn the lower and upper standard 1/2" nuts until they are snug against the bearing. If the standard 1/2" nuts become loosened, consider adding another nut to each end against the existing nut to keep them in place.

For 1/2" acme 5 start lead screws, you will need to use an antibacklash nut in place of the square nut. This nut attaches with a flange using two #8 screws and nuts. The standard 1/2" nuts are replaced by clamping collars.**Click the link to add information to this solution:**

I couldn't find any information about how to mount the "z-axis lead screw in the book" (Build Your Own CNC)**Can I make my feedrates faster by changing my lead screw?**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.

- Old lead screw: 1/2" allthread = 13 threads per inch (UNC)

- 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.**Click the link to add information to this solution:**

Can I make my feedrates faster by changing my lead screw?**I need a copy of an invoice. Can you tell me how to find a printable version of a recent order?**Invoices are generally attached to order confirmation emails. If you did not receive an order confirmation with an invoice attached, please contact us by phone 281-815-7701 or email customerservice@buildyourcnc.com and we will provide a copy of the invoice for you.

**Click the link to add information to this solution:**

I need a copy of an invoice. Can you tell me how to find a printable version of a recent order?**How to determine lead screw length needed. My Thomson 1 1:4 rails are 60 inches long roughly for the router I’m building. I know I have to have it long enough to couple up with the stepper motor of course but does it matter if it’s a little long on the other end**It generally does not matter if it is longer at the other end as long as the lead screw provides the desired travel for that axis. The lead screw will only need to be long enough for the travel, plus any structure and lead-nut positioning.

For example:

- The motor that will turn the lead screw will need to be mounted at some position (generally at one end of the axis). In many cases, this positioning will be mounted where some of the lead screw will not be used (the lead nut will not be able to moved close to the coupling of the lead screw to the motor shaft). Add some of the length of the lead screw to be inserted into the coupling.

- If the lead screw will contain bearings at either end of the travel, that portion of the mechanical assembly will need to be considered in the lead screw length.

- The lead-nut will need to be mounted in a position on a structural member of the part that is to move. The distance from the part of the structure that will extend closest to the motor will have some distance to the position of the lead nut. This distance will need to be added to the lead screw length.

Add these discrepancies to the length of the lead screw and the travel length and you will have the final length.**Click the link to add information to this solution:**

How to determine lead screw length needed. My Thomson 1 1:4 rails are 60 inches long roughly for the router I’m building. I know I have to have it long enough to couple up with the stepper motor of course but does it matter if it’s a little long on the other end**How do I cut on the inside of a polygon using CAMBAM?**The apply a machining operation that cuts along the inside of a polygon, you will need to use the profile machining operation located at the top of the user interface, the first icon in red to the left. Hovering over the icons will inform you of what machining operation the icon represents.

Select the polygon and click on the profile icon. A new profile operation will be created in the left drawing pane (outline of machining operations). Underneath the drawing pane, there is another pane with parameters for the profile listed. Find the Inside/Outside parameter and click just right of that parameter to change the setting to inside.**Click the link to add information to this solution:**

How do I cut on the inside of a polygon using CAMBAM?**How do I secure the non-motor end of the lead screw for my 'Book' machine build? Does it just sit inside the bearing or do i use a nut to lock it in place? I did not see any instructions for this in the book.**Use a clamping collar (if you are using an ACME lead screw) or a couple of 1/2 nuts (if using an allthread) against the bearing to keep the bearing in place and make sure there is no axial play.

**Click the link to add information to this solution:**

How do I secure the non-motor end of the lead screw for my 'Book' machine build? Does it just sit inside the bearing or do i use a nut to lock it in place? I did not see any instructions for this in the book.**LENGTH OF THE BRUSH STRIP FOR SPINDLE 2.2KW**The total length of the brush strip for a 2.2kW spindle would be 17 1/4" inches.

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20**Click the link to add information to this solution:**

LENGTH OF THE BRUSH STRIP FOR SPINDLE 2.2KW