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Question #: 14524

Question: i zero out the z axis on a file and about half way through, the bit is lower then it started. about 1/8 off

Current Solution

Sounds like it is stalling as the z is trying to move up. I would first try putting 3-in-1 oil on the screw and run the z up and down a lot as fast as possible so you can confirm the z is capable again. It could also be the shaft or the lead screw slipping in the coupling. Finally, check the wiring where there may be zip ties or other places where the wires are fastened and look for chafing. This can cause intermittent shorts in the wires.

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Other Possible Solutions to this Question

  • i zero out the z axis on a file ad about have way through the bit is lower then it started. about 1/8 off

    Sounds like it is stalling as the z is trying to move up. I would first try putting 3-in-1 oil on the screw and run the z up and down a lot as fast as possible so you can confirm the z is capable again. It could also be the shaft or the lead screw slipping in the coupling. Finally, check the wiring where there may be zip ties or other places where the wires are fastened and look for chafing. This can cause intermittent shorts in the wires.

    Click the link to add information to this solution:
    i zero out the z axis on a file ad about have way through the bit is lower then it started. about 1/8 off

  • My CNC machine has suddenly started going in only one direction in the Y axis. It was working fine for several days and then started going in a single direction when I would do a manual job.

    We have ran across this issue on occasion, and usually results is there is something along your wiring that is causing a fault or is not getting good contact.
    We would recommend going through the wiring thoroughly and checking continuity with the y-axis wires, going from your USB or Parallel BoB to the driver.

    Click the link to add information to this solution:
    My CNC machine has suddenly started going in only one direction in the Y axis. It was working fine for several days and then started going in a single direction when I would do a manual job.

  • How do I get started I would like to build a cnc router. Making the machine I can do, but I am weak on cad,cam and mach3. I am thinking about a 4’x4’. Do you have plans I can buy?

    We are developing plans for our machine, but they are not completed yet. Please let me know if you would like to be added to our list of customers wanting plans. Thanks,

    Additional Information:
    If you have specific questions regarding CAD, CAM and Control, please add another question to the customer service and I will answer them in detail.

    Click the link to add information to this solution:
    How do I get started I would like to build a cnc router. Making the machine I can do, but I am weak on cad,cam and mach3. I am thinking about a 4’x4’. Do you have plans I can buy?

  • I there a tutorial on hooking up a Z axis zero touch plate to the usb controller?

    To use a touch plate on any controller, all you need is a conductive flat material with a known thickness and some wire and alligator clips. Solder a wire to the touch plate and connect the other end of the wire to the free input terminal of the controller. Connect a wire with an alligator clip to the ground of the controller (on the Mach3 USB controller, this ground is the DCM terminal, or the digital gnd on the 24VDC power supply). Connect the alligator clip to the end mill.

    You can either use a script to serve as the probe, or you can use the ref all home button and setup the touch plate as a home switch.

    Click the link to add information to this solution:
    I there a tutorial on hooking up a Z axis zero touch plate to the usb controller?

  • [790] Is there a way to build a 2x8 flat cnc with a 4 th axis on the side so I can do 24” diameter objects. Or have the z axis that tall

    a 2' (24 inches) diameter workpiece for a 2'x8' machine may be a bit too much for an overhang. I would recommend the 4'x8' that can house a 4th axis in a cavity within the limits of the machine for a 24-inch part. If you need the rotary axis on the side of the machine, I can design a machine that would work.

    Click the link to add information to this solution:
    [790] Is there a way to build a 2x8 flat cnc with a 4 th axis on the side so I can do 24” diameter objects. Or have the z axis that tall

  • The spindle has started on my Machine while the machine was sitting idol, I'm not sure if the relay has failed on the breakout board. Is there a way to test this?

    First, you should check the configuration in your CNC control software and determine if the spindle control pin is correctly set. That pin will engage the relay.

    The P and O position of the relay is set as Normally Open where the relay is open (open circuit, or no connection) at idle and when engaged will be closed (closed circuit, or connected). If you suspect that the relay is damaged, the recommended action would be to disconnect the spindle from the relay and operate the spindle/VFD manually using the Run and Stop buttons on the face of the VFD (until the breakout board can be replaced).

    Click the link to add information to this solution:
    The spindle has started on my Machine while the machine was sitting idol, I'm not sure if the relay has failed on the breakout board. Is there a way to test this?

  • HI..I am having a problem with my machine going off axis and not returning to zero

    Hi, can you elaborate on what you mean off axis? If the CNC router is milling correctly and then suddenly in a location that you would not expect, then you are exceeding the torque of the stepper motors and stalling. If the cnc router stalls, then the cnc router will continue but the software controlling the cnc router will not have the correct position of the cnc router.

    If this is the case, then you need to either reduce the acceleration, reduce the velocity, or both. Does the problem occur during the milling process or during the jogging (rapids)?

    Click the link to add information to this solution:
    HI..I am having a problem with my machine going off axis and not returning to zero

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

  • I have a KL-4030 stepper motor driver that I only have about an hour use on it but seems to be bad already. Has anyone out there had the same problem?

    The KL-4030 is a Keling 3.0 amp stepper motor driver. These are generally pretty robust drivers. You mentioned in the question that it worked for one hour. This sounds like it could be a contact issue with the wiring in the terminals. I would recommend that you check all of the connections. The terminals that are used in these drivers have terminals that are easily used incorrectly.

    Make sure to open the terminal all the way using a small screw driver. Then insert the exposed wire into the opening and re-tighten the terminal. Make sure of a good connection by tugging on the wires.

    Also, check kthe digital wires that connect from the driver to the control board.

    Click the link to add information to this solution:
    I have a KL-4030 stepper motor driver that I only have about an hour use on it but seems to be bad already. Has anyone out there had the same problem?

  • hi, i ordered a bunch of stuff from you, the payment went through, it's been 3 weeks, any word on shipping date, I ordered 6 linear rails with block and some sprockets

    John Parent,

    We are currently waiting for rails to come in as they are out of stock. We appreciate your patience. Please email customerservice@buildyourcnc.com and let us know if there is anything we can do.

    Click the link to add information to this solution:
    hi, i ordered a bunch of stuff from you, the payment went through, it's been 3 weeks, any word on shipping date, I ordered 6 linear rails with block and some sprockets

  • Can I make the whole for the router larger? This is for a blacktoe and the whole is about 1/4 inch in diameter too small.

    If you are using a router that will not fit into the router mount, it is best to have the mount requested from us. The mounts were designed with the appropriate thickness of material for structural purposes and to maintain this structure under load.

    Click the link to add information to this solution:
    Can I make the whole for the router larger? This is for a blacktoe and the whole is about 1/4 inch in diameter too small.

  • On the Book Build: I'm changing the 13TPI 1/2" lead screw with the 1/2" 10 TPI Acme screw with the anti backlash nut. This is for the Z axis only. What should I know about installing it and what are the numbers I need to plug into the motor tuning area.

    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! (

    ).
    Here is a default setting that you might be able to tune and adjust accordingly: 1600 steps, accel 400.02, velocity 5.

    Click the link to add information to this solution:
    On the Book Build: I'm changing the 13TPI 1/2" lead screw with the 1/2" 10 TPI Acme screw with the anti backlash nut. This is for the Z axis only. What should I know about installing it and what are the numbers I need to plug into the motor tuning area.

  • When I run a file with a lot of z movements, the Z seems to get lower

    Sounds like it is stalling as the z is trying to move up. I would first try putting 3-in-1 oil on the screw and run the z up and down a lot as fast as possible so you can confirm the z is capable again. It could also be the shaft or the lead screw slipping in the coupling. Finally, check the wiring where there may be zip ties or other places where the wires are fastened and look for chafing. This can cause intermittent shorts in the wires.

    Click the link to add information to this solution:
    When I run a file with a lot of z movements, the Z seems to get lower

  • I am wiring my breakout board and it has a USB port on it. Is the USB port there to supply the 5 volt power to it?

    For our parallel breakout board (https://www.buildyourcnc.com/item/electronicsAndMotors-parallel-breakout-relay#prettyPhoto/2/) the schematic will show the connections going from the BB to the drivers. The parallel breakout board uses the 25 pin parallel connection to communicate from the computer to drivers, and the USB is used to power the main-board itself, supplying 5V.

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    Click the link to add information to this solution:
    I am wiring my breakout board and it has a USB port on it. Is the USB port there to supply the 5 volt power to it?

  • Spindle is making a strange sound for a few seconds then shuts off. It is also tripping the breaker on the surge protector. Is this fixable? https://youtu.be/aofbvY3RnIw

    Yeah, that is not right at all. I think you either have an issue with the shaft, or the bearings are bad. Probably the latter. How old is the spindle?

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    I bought this off craigslist so it is at least 3-4 years old. I've been hearing an odd noise for the last week or two so I'm thinking it was starting to fail.

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    I would say that it has lived its life. In CNC routers, routers will last far shorter time. Spindles are relatively inexpensive, so I would just replace it.

    Click the link to add information to this solution:
    Spindle is making a strange sound for a few seconds then shuts off. It is also tripping the breaker on the surge protector. Is this fixable? https://youtu.be/aofbvY3RnIw

  • I need a resource, we bought 2 redfly systems and mach 4, We put one motor on for the x axis but cannot get it move. Can you direct us to some tutorial?

    Could you specify which breakout board you have? If you have a parallel port version, be sure that you have purchased the "legacy" parallel port version from Mach4. If this proves not to be the problem, please feel free to email us directly at techsuport@buildyourcnc.com or call 281-815-7701 for troubleshooting instructions.

    Click the link to add information to this solution:
    I need a resource, we bought 2 redfly systems and mach 4, We put one motor on for the x axis but cannot get it move. Can you direct us to some tutorial?

  • What tolerance can I expect from your largest cnc machine and the laser cutter? Also, what depth can I get on the z axis?

    The largest CNC machine we make at this time (12/04/2015) is the GreenBull 6'x12' model. This model has 2 options for Z-axis travel.

    The short-z option has a total Z travel of 5.75 inches. From that you would subtract the length of the end mill used and the thickness of the spoil board to determine the maximum material thickness. (Example: If the end mill extends 1.25" from the collet and the spoil board is .75", then the material could be up to 5.75 - 1.25 - 0.75 = 3.75 inches in thickness). This is good for most sheet-type materials.

    The long-z option, used mainly for large 3D carvings, requires a custom frame and allows for up to 36" of travel.

    The tolerance of our machines, like any machine, depends on several variables. The major variables include the manufacturing tolerance, the type of machine control used, the precision of assembly, the thoroughness of maintenance, and the initial and ongoing calibration of the machine. Because we sell kits only most of these variables are outside our control. Therefore, we are hesitant to guarantee a certain level of tolerance for an end user. However, in our experience, tolerances of .001" are readily achievable with our machines.

    Additional Information:

    Click the link to add information to this solution:
    What tolerance can I expect from your largest cnc machine and the laser cutter? Also, what depth can I get on the z axis?

  • USING MACH3, MY MACHINE STOPS IN THE MIDDLE OF A PROJECT. HOW CAN IT BE STARTED AGAIN FROM POINT STOPPED?

    Dealing with a mid-stop cut via Mach3, you will have to be careful if it is intentionally or unintentional. If you desire to stop your machine while in the middle of a cut be sure to stop it when the machine is moving in an upward motion on the z-axis and the X/Y-axis are stationary. Then you can choose the point (G-code) where the machine was left off and click on the Run from here button on the Program Run screen (left hand side) right above the Reset button.
    (Make sure spindle/router is running before hand!)

    Now if the machine stops unintentionally, and was moving in either the X/Y-axis, then it will be difficult to run the machine from the original point dealing with the coordinates might have been lost due the the machine continuing motion but via Mach3 the machine has stopped.

    If this occurs to fight this issue before hand, is marking your home with the spindle/router to make a hole were your home is. Although moving it manually back to home the machine can be off by the smallest amount and could cause an inconsistent cut. If accuracy is something that can not be risked, then you can home the machine about a 1/4" or 1/2" down from the original home to start your cut on the same material but loosing that small piece.

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    My typical go to solution is:

    - Note the current g-code line where the machine stopped.
    - If Mach3 errored and you cannot control the machine, Exit Mach3 - you may find that reset, stop does nothing to stop the spindle. When you exit mach3, the spindle will stop automatically.
    - Restart Mach3. The DRO (Digital Readout) should show the correct coordinates where the machine position was before exiting Mach3.
    - Scroll to the g-code line where the machine stopped. You may need to go a few lines prior to make sure you are not skipping any machining operations (which is why it is a good idea to learn the basics of g-code - don't worry, it's easy)
    - Click on the "Run from Here" button.
    - Mach3 will present you with a "Preparation Move" dialog box with the location that it will move to. If the coordinates shows a position that is into the material, make sure to specify a rapid height (clearance height) so the machine will move up first and then move to the location before moving down into the material. If the spindle is automatically controlled by Mach3, make sure to check the turn spindle on checkbox. If not, make sure the router or spindle is on before clicking OK.

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    My cnc router stops at gcode line 50,000 and cannot finish program. They are about 150k of lines total. I have Mach3 and have bought the additional line capability. Is 50,000 (or around that) the limit? Is Mach 4 hobby license better and in what ways? Thanks! Mike Huber

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    If you have a license for Mach3, then you should be able to run g-code indefinitely. I think there is something else going on.

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    If you have a license for Mach3, then you should be able to run g-code indefinitely. I think there is something else going on.
    What else could be going on?

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    USING MACH3, MY MACHINE STOPS IN THE MIDDLE OF A PROJECT. HOW CAN IT BE STARTED AGAIN FROM POINT STOPPED?

  • mach3 freezes in the middle of a run, I don't get any message. I have press reset and then the jog buttons work. I have to reset the zero and start from the last line when the machine stopped. It happens mostly during the finishing part of the g-code file

    What interface board are you using? Typically, this will be an issue with the computer that MAch3 is installed. The only other component that may affect this would be the interface between the computer and the machine.

    Click the link to add information to this solution:
    mach3 freezes in the middle of a run, I don't get any message. I have press reset and then the jog buttons work. I have to reset the zero and start from the last line when the machine stopped. It happens mostly during the finishing part of the g-code file

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