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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How do I order 3 specific lengths of lead screws in one order? I could only order a single total amount via the shopping process. I require 36", 60" and 14". If I order 110", I will get 79" + 31". Do I have to order 115" and pay for an extra 5" to get around this?

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?".

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how do I order multiple lengths of HIWIN guide rail with blocks?

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.

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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

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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How do I order a pacific length of lead screw?

Purchase the total length of the product that interests you (i.e. the linear bearing guide) and call us to inform us how you would like it cut. The phone number is located at the top right of each web page by hovering over the "Need Help?" message.

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How do I specify multiple quantities of custom cut lengths of the linear bearing guide?

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.

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Can I increase the travel speed of my machine with different lead screws?

The roller chain lengths for the greenBull 4x is:
- 13 feet for each side of the X axis (total of 26 feet), and
- 6 feet for the Y-axis

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WHAT LENGTHS OF ROLLER CHAIN DO I USE FOR THE GREENBULL 4X CNC?

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.

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how do I get the status of my order?

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.

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I have just purchased 95 in. of 1/2 in screw and I need it cut to different lengths 51" 30" 14". Can do?

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?

Dealing with Tax Exemption forms, please refer to contacting us at customerservice@buildyourcnc.com

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How do I enter tax exemption for my order?

You can find the required components for our scratch build CNC here(https://buildyourcnc.com/cnckitintro.aspx).

Lead Screw needed will be:
X-axis: 52 Inches
Y-axis: 32 Inches
Z-axis: 14 Inches

These will be the bearings that are specified that will be needed:
Bearings 1/2" Inside Diameter - 6
Bearings 5/16" Inside Diameter - 24

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Hi, I need the lead screws and bearings for the 4' x-axis, the 2'(?) y-axis and the 1'(?) z-axis as specified in the book 'Build your own cnc'. I am not sure which to order on your website. Thanks

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.

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How do I keep the lead screw from moving back and forth?

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.

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I need a copy of an invoice. Can you tell me how to find a printable version of a recent order?

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

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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.

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

For order inquiries please call us at 281-815-7701 or email customerservice@buildyourcnc.com. Thank You!

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I would like to add to my oder as well. I had the two nema 34 needing to go to 1 and the one nema 24 going to two. i need lead screws and couplings

If you were logged in when you made the purchase, you can click the "My Account" link at the top of any page on this website and see all of your orders, order line items (with direct links to these items), and shipment information.

Here is a link to the "My Account" page for your convenience:
https://www.buildyourcnc.com/CustomerInfo.aspx

I did not see your username on your internal customer record, so I added this username and you should be able to see the information in the "My Account" page.

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I just tested your accounts page and the cable carrier links are in there. Thanks and please let me know if you need further assistance.

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I have purchased cable carrier chain and would like to know if you could send me a copy of that order as I need to purchase extra lengths of the links I bought. Thanks

To change the direction of an axis in Mach3:
- open Mach3
- Click on the config selection on the top menu
- Click on ports and pins under the config menu
- Click on the motor outputs tab in the ports and pins dialog box
- In the axis row that you wish to chang ethe direction, click on the active low toggle for direction.

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In mach3, how do you flip the direction of an axis?

Yes, you can use 2 motors in the same axis output, however you will still need a driver for that motor! Also depending on the orientation on which you mount the motor you might have to invert the direction of the motor, and that will be simple by swapping the A+,A-, to the B+,B- locations and vice versa, from the driver to the motor wiring.

Also you can run a slave motor using another axis on the board, and setting it up in the Planet-CNC settings.

Planet-CNC/File/Settings/Axes, here you will enter 3 in the Number of Axes location, and then change the Function of the Axis 4 to Slave 1. There you will have the 4th axis or A-axis be a slave for the x-axis.
Slave 1 - X-Axis
Slave 2 - Y-Axis
Slave 3 - A-Axis
Slave 4 - B-Axis
Etc...

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How do I wire two stepper motors for one axis?