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Question #: 14405

Question: Can’t find info about all three lead screws in you book or how to secure them

Current Solution

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.

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Other Possible Solutions to this Question

  • 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 respond:
    I couldn't find any information about how to mount the "z-axis lead screw in the book" (Build Your Own CNC)

  • Do you sell leadscrews and ballnuts that are 5 TPI? I'd like 0.001" per step, using a 200 steps/rev (1.8 degree) motor.

    We sell leadscews and anti-backlash nuts at the moment. Ballnuts will be available from us in the future.

    Specifically to your question, you want 0.001" resolution:

    The formula: (we are looking for a minimum of 1000 steps per inch
    steps = (motors steps)/(travel with one motor rotation)

    steps = (200 natural motor steps) x (microsteps ) / 0.5" travel (1/2" leadscrew 10 TPI 5 Starts)

    steps = 200 * microsteps / 0.5"

    multiply both sides by 0.5":

    steps * 0.5" = 200 * microsteps

    divide both sides by 200:

    (steps * 0.5") / 200 = microsteps

    replace steps with 1000:

    (1000 * 0.5") / 200 = microsteps

    500 / 200 = microsteps

    2.5 microsteps will provide .001"

    I would recommend 4 microsteps (1/4 microstepping), so your formula will be as follows:

    steps = steps/inch = (200 * 4) / 0.5" = 800 / 0.5" = 1600 steps/inch

    Click the link to respond:
    Do you sell leadscrews and ballnuts that are 5 TPI? I'd like 0.001" per step, using a 200 steps/rev (1.8 degree) motor.

  • I have just brought your build your own cnc machine book and it talks about PDF downloads. Where do I find them please ?

    You can see the component list on the hardware and plans machine (scratch build machine) since it is the same machine in the book:

    https://www.buildyourcnc.com/Item/cnc-machine-scratchbuild

    Additional Information:

    Click the link to respond:
    I have just brought your build your own cnc machine book and it talks about PDF downloads. Where do I find them please ?

  • how long are your lead screws 3/8 and how much ? looking for 3/8 see my previous question

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

    Click the link to respond:
    how long are your lead screws 3/8 and how much ? looking for 3/8 see my previous question

  • Your book states to cut lead screws to length, are they soft enough to use a hacksaw?

    Yes, you can use a hack saw as these lead screws are not hardened.

    Click the link to respond:
    Your book states to cut lead screws to length, are they soft enough to use a hacksaw?

  • I have a project very similar to cnc machine. I need 3 lead screws of 1.8 m with all set (supports, bearings...etc). and 3 NEMA 42 motors that I can connect with. if those are available, I need the information about shipping to Oman or UAE.
  • Just bought Build Your own CNC Machine book. It is missing the chapter on lead screws that is described on page 181 at the end of Chaprer 16. Where can I get this info?

    It sounds like you got a misprinted book. If you purchased it from us, please contact us directly for a replacement. If you bought it from Amazon or a third party, you'll need to contact them. General information about lead screws is available on this website and at buildyourtools.com.

    Click the link to respond:
    Just bought Build Your own CNC Machine book. It is missing the chapter on lead screws that is described on page 181 at the end of Chaprer 16. Where can I get this info?

  • If using a grease how does one protect leadscrews and rails from corian dust etc.

    If you have abrasive particles in the air from milling, you will want to periodically clean the mechanical parts like the lead screw and anti-backlash nuts. After cleaning the parts, all of the high friction parts that will be in constant contact, lubricating the parts with oils, grease or other lubricants. If the part is of steel material, that material will definitely need to be oiled, greased or lubricated so minimal oxidation will affect the exterior of the steel parts.

    The anti-backlash nut is made of Delrin, so petroleum chemicals like oils, grease or lubricants are ok to use. Abrasive particles may affect the anti-backlash nut over time; however, the spring and bushing of the anti-backlash nut will provide extensive use regardless of the wear.

    Click the link to respond:
    If using a grease how does one protect leadscrews and rails from corian dust etc.

  • i recently bought your book,trying to find pages refered to for building my own cnc

    You can find the web pages that refer to the book at this url:

    https://buildyourcnc.com/Book.aspx

    Click the link to respond:
    i recently bought your book,trying to find pages refered to for building my own cnc

  • how to calibrate stepper motors with ballscrews In mach3

    The easy way is to use Mach3's calibration process to calibrate the axis with the ballscrew coupled to the stepper motor. This is done in the settings tab of Mach3 and clicking the button just above the "Reset" button called "Set Steps Per Unit". A dialog box will appear asking how far you want Mach3 to move that axis. Mach3 will move that axis at a distance that is determined by the existing steps per unit value set in the motor tuning dialog box (config menu -> motor tuning). Not knowing the distance that this axis will travel, it's best to use a very small value.

    The more difficult way and the technique that should be used to create the initial value for the step per unit in the motor tuning dialog box. Use the steps/unit formula. This example will use inches.

    Steps/Inch
    = ((motor natural steps) x microsteps) / (the travel for one complete revolution)

    The travel for one revolution would be the distance a ball nut will travel with one complete turn of the ball screw. This is generally the number of starts / threads per inch. Say the ball screw has 5 starts (5 threads starting from the beginning of the screw) and 10 threads per inch (TPI), then the travel for one complete turn of the screw would be 5/10, or 1/2".

    Say you set the microstepping to be 1/4 on the stepper motor driver and your stepper motor has 200 natural steps per revolution (1.8 degrees per step), then the total steps would be 200 x 4 = 800.

    So, the steps/inch is 800 / 1/2" = 1600 steps per inch

    Hope that helps

    Click the link to respond:
    how to calibrate stepper motors with ballscrews In mach3

  • I want to purchase some items from your co. How do i go about it. I already have the buildyourcnc book and wand to begin.

    For purchasing on our website, our account log in is a safe way to keep your personal data at hand for future orders. However we do not keep any bank information in our systems, it is a single use system.

    Now dealing with the cnc book, you can view our web version of the book with a list of materials and hardware that will be needed here (https://www.buildyourcnc.com/cnckitintro.aspx).

    Adding the items to your cart in the quantity's needed, now for certain items for example, or ACME screws, and aluminum angles will require a total length needed, but the specific lengths required will have to be email here (customerservice@buildyourcnc.com) or called here (281-815-7701) with the completion of your order.

    Click the link to respond:
    I want to purchase some items from your co. How do i go about it. I already have the buildyourcnc book and wand to begin.

  • how long are your lead screws 3/8 and how much ? looking for 3/8 see my previous question what is the minimum length and how much per inch
  • 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

  • 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.

    Additional Information:
    20

    Click the link to respond:
    How do I order specific lengths of lead screws in one order?

  • 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

    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

    Click the link to respond:
    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

  • 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.

    Click the link to respond:
    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

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

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

  • do you guys sell full set of lead screws, machined with bearings and mounts?

    We sell all of those parts and if you need the lead screw machined to a specific spec, we can do this. To provide the specs, please send an email to us from the contact us page, link located in the footer.

    If there is a specific part you need, please let us know and we can let you know if we have it, or if we can start carrying it.

    Click the link to respond:
    do you guys sell full set of lead screws, machined with bearings and mounts?