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Question #: 13832

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

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.

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Other Possible Solutions to this Question

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

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

  • what are the different (feed, travel,rotation) speed to use with planet cnc and a 5x10 greenbull to cut mdf please?

    The feeds and speeds for cutting MDF will depend on the end mill that you are using and at the depth you are cutting.

    The feedrates below are based on 18,00 rpm and using a spindle. Routers will not be able to handle these feedrates.

    Our Onsrud end mills will cut MDF at 3/4" depth per pass at around 300 ipm using the compression end mill. A standard Onsrud single flute will cut MDF at 3/4" depth at 120-140 ipm.

    A general purpose 2 flute end mill at 3/4" depth can cut at around 80 ipm from our experience.

    Click the link to respond:
    what are the different (feed, travel,rotation) speed to use with planet cnc and a 5x10 greenbull to cut mdf please?

  • 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?

  • 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

  • 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.

  • What is travel speed of the blackfoot machine ?? I read in a forum somewhere that it's around 100inches/minute. Is that accurate ??

    The jog speed of the blackToe is 1000 - 1500 ipm (inches per minute). I generally set this to about 700 ipm just to be safe and 700 ipm is plenty fast for most scenarios. The cutting speed will depend on the tool (end mill) that you will use for the application, the material being used and whether a spindle or router is used. In a scenario that a spindle is used and cutting relatively hard plywood at 3/4" full depth using an Onsrud 1/4" diameter compression end mill, you can cut at around 100 - 300 ipm. Using a router would be only half the speed and cutting depth due to the poor torque.

    Click the link to respond:
    What is travel speed of the blackfoot machine ?? I read in a forum somewhere that it's around 100inches/minute. Is that accurate ??

  • 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?

  • 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.
  • I received the electronics for book build cnc machine. I need to know how much weight the z-axis motor can hold since my (craftsman) router seems to be heavy. It is 2HP with variable speed

    The motor is helped by the mechanical leverage of the screw. The 425 oz-in motors that are included in the standard electronics combo has very high torque for that type of machine. You will have no problem using that motor for the book machine.

    We use that motor for very heavy spindles on the blackToe and blackFoot CNC Machine kits.

    You will need to do the mechanical leverage calculation along with the torque of the motor to determine the actual weight it will lift. The calculation will need to consider the type and pitch of the screw and it would also consider the gravity constant of 9.8 m/s/s.

    If you need me to determine this formula and work out the calculation based on the screw you are using, please let me know.

    Additional Information:
    thank you for the reply. I would be really good to know the calculation. The lead screw is 1/2" diameter with 13 TPI. Please provide the calculation. And one more question. If I am cutting 18mm MDF with 6mm cutting bit (so 6mm pass), what can be the maximum speed rate of cutting and spindle speed of router?
    thank you

    Click the link to respond:
    I received the electronics for book build cnc machine. I need to know how much weight the z-axis motor can hold since my (craftsman) router seems to be heavy. It is 2HP with variable speed

  • 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?

  • 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 I control the speed of a 2.2 spindle through your 5 axis breakout board with relay?

    Yes, you can control the speed of the 2.2 kW spindle, and the other spindles we sell, through Mach3 software. It requires making some changes to the settings in Mach3 and in your inverter. It also requires an additional part, which is called a USB to Serial Converter, found on our site here:

    https://www.buildyourcnc.com/item/Interfaces-newbiehack-Interfaces-TTL232R-USB-UART-Serial

    I have some additional instructions, that I will send upon request, by email. I will also be adding a complete tutorial and video, to the website, on how to do this soon.

    Additional Information:
    20

    Click the link to respond:
    can I control the speed of a 2.2 spindle through your 5 axis breakout board with relay?

  • CAN I GET DXF FILES FOR THE UPDATED PARTS OF MY MACHINE?

    Yes, the customer will need to sign our NDA (Non Disclosure Agreement) form and send it back to us. We will then send the dxf of the specific updated part of the machine.

    Click the link to respond:
    CAN I GET DXF FILES FOR THE UPDATED PARTS OF MY MACHINE?

  • 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

  • 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?

  • 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?

  • MY COMPUTER DOES NOT HAVE A PARALLEL PORT. HOW DO I INTERFACE WITH THE MACHINE?

    If your computer does not have a parallel port, all you will need is a low cost PCI parallel adapter card (these can be found on amazon for $15-$20). If you plan on using a laptop (not recommended) you can try to find a PCMCIA parallel adapter, but many people have frequent issues with this setup. A more expensive solution would be to purchase a USB smooth stepper board. Unfortunately, we do not supply any of these adapters and cannot attest to their reliability.

    Additional Information:
    ur gay

    Additional Information:

    Click the link to respond:
    MY COMPUTER DOES NOT HAVE A PARALLEL PORT. HOW DO I INTERFACE WITH THE MACHINE?

  • I wonder if it is possible to do 3d engraving with the 40w laser kit? different depths is the same piece of wood.

    You can cut at varying depths with the 40w laser cutting and engraving machine. Each layer of engraving with the laser will leave behind a black charred film that will reduce the effectiveness of the engraving for deeper layers; therefore, a very strong air assist will be needed to blow this film off of the surface of the material.

    CNC machines are more successful and efficient at carving and should be considered.

    Click the link to respond:
    I wonder if it is possible to do 3d engraving with the 40w laser kit? different depths is the same piece of wood.

  • How much Z-axis travel does the 48x96 greenlean machine have?

    The greenLean Z-axis travel is about 4" - 5"-3/4".

    Click the link to respond:
    How much Z-axis travel does the 48x96 greenlean machine have?

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