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Question #: 13831

Question: I want to increase my travel speeds. Can I change the lead screw to make my machine quicker?

Current Solution

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.

Respond:

Other Possible Solutions to this Question

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

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

  • 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.

  • 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.

  • 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.
    - 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 respond:
    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.

  • Is it possible to increase the Z axis on the Blacktoe 2x4? My ideal would be to have 8" of travel.

    Increasing the size on your Z-axis is possible by making the over z axis longer (rails, wood structure). Remember the location of your router/spindle and over all integrity of the z-axis structure.
    Now another way of getting a longer reach is making a adjustable height table, so that you can raise or lower the material section(2' x 4') to add taller material or get a deeper cut.

    Click the link to respond:
    Is it possible to increase the Z axis on the Blacktoe 2x4? My ideal would be to have 8" of travel.

  • i want to make a cutter laser machine with 4kwatt power so i want to buy all this laser components can you list the parts and cost thanks

    We can lower the price for just the hardware and also for the structure. However we do not have any files, dimensions, for public access.

    Additional Information:
    Would there be any/enough measurement or info on the instructions to extrapolate the dimensions? What would the new pricing be?

    Click the link to respond:
    i want to make a cutter laser machine with 4kwatt power so i want to buy all this laser components can you list the parts and cost thanks

  • I just made the book build Cnc machine with the feed rate of 11.19 inch/min as suggested in book. Can I increase it to 20 inch/min? I have 2hp of router attached

    The book (scratch build) will be able to cut at very high rates of speed, but the speed is partly determined by the mechanical setup. Cutting wood is generally recommended between 60-200 ipm depending on the end mill and spindle being used. The larger the end mill (with increased chip load capacity) the faster the feedrate.

    If you are using a standard allthread, you will not be able to have these high feedrates. You will need to purcahse high lead leadscrews: https://www.buildyourcnc.com/item/mechanical-leadscrews-leadnuts-!5-5-starts-10-tpi

    The stepping motors need to turn 13 times to travel one inch using standard allthread (1/2-13 TPI - threads per inch). The higher lead leadscrews shown in the link provided will move one inch with only two turns allowing the machine to move many times faster.

    These speeds are especially important if you are cutting materials that have low melting points like aluminum and thermoplastics like acrylic, Plexiglas, etc. These materials require high feedrates and smaller depth per passes.

    Additional Information:
    20

    Click the link to respond:
    I just made the book build Cnc machine with the feed rate of 11.19 inch/min as suggested in book. Can I increase it to 20 inch/min? I have 2hp of router attached

  • On the blackFoot 4'x8' CNC machine do you have the instructions under one file that I can download, I want to print them out and make notes as I am building the machine.

    WE don't have an actual file that contains the instructions for the machines as they are a part of a larger database file that is queried during the product page's rendering in the browser. The best option would be to print the webpage on a printer and use that as notes.

    I know this will not provide larger images, but you could use the paper version to write your notes while assembling the machine using the larger images on the website.

    Click the link to respond:
    On the blackFoot 4'x8' CNC machine do you have the instructions under one file that I can download, I want to print them out and make notes as I am building the machine.

  • What is the best way to determine speeds and feeds for machine and bit longevity?

    The speeds and feeds are generally based on the amount of flutes that are being used per pass and how hot the end mill is getting when milling.  You want to use as much of the flutes as possible on single cuts.  Make the deepest cuts you can to increase the life of the tool.  For instance, if a tool that is 1 inch in cut length and the depth per pass is 1/4", then only that 1/4" is being used for the cutting.  The 1/4" tip of that tool will wear faster.  
    Make sure the feedrate is as fast as possible without a cost to the edge finish.  This will keep the end mill cool since there will be minimal friction as you are always cutting into fresh cooler material.  
    Use the end mill manufacturer's chip load for the tool to determine the starting feed rate.

    Feedrate (IPM - Inches/Min) = Spindle RPM x # of Flutes x Chip Load
    See each end mill for the chip load value.

    If your machine cannot achieve these feed rates, reduce the spindle RPM using this formula:
    Speed (RPM) = Feed Rate (IPM) / (# of Flutes x Chip Load)

    Click the link to respond:
    What is the best way to determine speeds and feeds for machine and bit longevity?

  • WHAT LEAD TIME CAN EXPECT FOR BLACKTOE SO PICK UP THE MACHINE?

    You can expect a one week lead time for our machines.

    Click the link to respond:
    WHAT LEAD TIME CAN EXPECT FOR BLACKTOE SO PICK UP THE MACHINE?

  • WHAT LEAD TIME CAN EXPECT FOR THE BLACKTOE MACHINE?

    You can expect a one week lead time for our machines.

    Click the link to respond:
    WHAT LEAD TIME CAN EXPECT FOR THE BLACKTOE MACHINE?

  • 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?

  • Hi! can i order a 6 ft long 1/2'' Lead screw with the motor and the gears with it?

    1/2" lead screw can be purchased in one length up to 77 inches (6 feet, 5 inches). Motors are found under the "Motion Electronics" menu, and gears can be found under "Mechanical Components".

    Click the link to respond:
    Hi! can i order a 6 ft long 1/2'' Lead screw with the motor and the gears with it?

  • Since I am using normal all-thread lead screw 13 TPI 1/2" for the book build cnc, what can be the maximum feed rate of machine and how can I change the mechanical setup in mach 3? I am using 1/4" steel carbile endmill with 2 flutes and router is 2 HP with variable speed

    Book build (scratch build), feedrates and recommendation.

    Using standard allthread will provide around 20-30 ipm using 36 volts. Although it allows for a working CNC machine, the RPM of the spindle/router will need to spin at the lowest setting to provide the beat efficiency and life for the end mill at 1/4" cut diameter and higher. The speeds may be fine for smaller end mills.

    If you would like faster speeds, you should change the lead screws on the CNC machine to the 1/2" 5 start 10 TPI which translates to 2 turns per inch which means, the stepping motor will not need to turn as fast to produce faster motion. That is to say, the stepping motor will only need to turn two revolutions for the machine to travel one inch and with the allthread, the stepping motor will need to turn 13 times to reach one inch.

    Link to the lead screw and other mechanical parts needed:
    https://www.buildyourcnc.com/CNCMachineMechanicalParts.aspx

    To change the lead screws you will need (for each axis):

    1. The lead screw for that axis.
    2. Two 1/2" collars to keep the lead screw axially stable.
    3. One Antibacklash nut.

    Additional Information:
    20

    Click the link to respond:
    Since I am using normal all-thread lead screw 13 TPI 1/2" for the book build cnc, what can be the maximum feed rate of machine and how can I change the mechanical setup in mach 3? I am using 1/4" steel carbile endmill with 2 flutes and router is 2 HP with variable speed

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

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

  • I want to cut the ends of steel pipes circularly as preparation for welding by plasma cutter , can you supply small machine?

    Yes, we can supply the parts for a machine that will turn pipes so they can be cut as they are turning. Are you intending the machine to cut using a milling process, or a plasma process?

    Click the link to respond:
    I want to cut the ends of steel pipes circularly as preparation for welding by plasma cutter , can you supply small machine?

  • Is there a thrust bearing you recommend for taking the vertical forces traveling through a Z-axis lead screw?

    We recommend using an anti-backlash nut with collar in addition to whichever coupling you are using.

    Click the link to respond:
    Is there a thrust bearing you recommend for taking the vertical forces traveling through a Z-axis lead screw?

  • 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 respond:
    Can I make my feedrates faster by changing my lead screw?

  • Can I purchase a computer off Amazon (I have a machine I want to use) and still use the USB interface to drive it with LinuxCNC?

    You will need to build the table unit for your machine. There are instructions on how to do this at the bottom of the product page here, https://www.buildyourcnc.com/Item/cnc-machine-blackFoot-v4
    There is no estimate on how much this will cost though, since there are too many variables involved to do this.

    - PC with parallel port and USB port
    - 20awg stranded wires for the motors - http://www.buildyourcnc.com/electronicscombo.aspx
    - 18awg stranded wires for power supply to drivers
    - 24awg stranded wires for breakout board to drivers
    (location and spacing of components varies from one person to another, so we do not provide cables/wires)
    - General purpose extension cord (cut the female end off) to provide power to power supply
    - USB cable to power breakout board
    - Parallel cable to communicate to breakout board
    - Router
    - (optional - instead of router) Spindle with power inverter http://www.buildyourcnc.com/SpindlesAndAccessories.aspx
    - (if purchasing spindle with inverter) General purpose extension cord (240v) (cut the female end off) to provide power to power inverter
    - End Mill(s) http://www.buildyourcnc.com/ProductsEndMills.aspx
    - CAD, and/or CAD-CAM software (to produce geometry, machine operations, and g-code) http://www.buildyourcnc.com/CNCsoftware.aspx
    - CNC control software (to read g-code and control machine) http://www.buildyourcnc.com/CNCsoftware.aspx

    This answer is applicable to most of our machines with the exception of the greenLean and the blueChick since those machines are equipped with a table structure.

    Click the link to respond:
    Can I purchase a computer off Amazon (I have a machine I want to use) and still use the USB interface to drive it with LinuxCNC?

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