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Question #: 1087

Question: when cutting patterns with my cnc router there is significant chatter in the cut-I've replaced the router-what else should I try?

Current Solution

Do you use the same bit?? If so, check if it is not dull or worn. Maybe it is time for a new bit. Additionally, I would check if the z axis mounts are tightened correctly and the router has no wiggle room. If that doesn't help, check all of the play that may be in the structure and where the bearings run along the rails and tighten all loose connections that may be present.

Additional Information:
So confused....is backlash and chatter the same thing or are they completely unrelated?

Additional Information:
Chatter and backlash are different. Backlash is a condition where there is play in the mechanical parts (i.e. a nut not tight against the treads, or two gears not meshing together tightly). Chatter is a phenomenon caused by many possible conditions including vibration, resonance, springiness and flexibility in the system and certain types of end kill and machine movement scenarios.

Additional Information:
Meant to say end “mill” at the end there.

Respond:

Other Possible Solutions to this Question

  • Hi I recently replaced my parallel port breakout bored with a USB breakout board, Motors Earl working properly but my wireless MPG is not working properly, it is jerky when to try to move across the table, is there a setting that I missed?

    Does the machine move smoothly when using the keyboard to jog the machine?

    Additional Information:
    Sorry it took so long to respond. Yes the table moves very smoothly using the keyboard. I try to reinstall of the drivers but it still moves very jerky with the MPG, sometimes moving back-and-forth.


    Additional Information:
    Sorry it took so long to respond. Yes the table moves very smoothly using the keyboard. I try to reinstall of the drivers but it still moves very jerky with the MPG, sometimes moving back-and-forth.

    Click the link to respond:
    Hi I recently replaced my parallel port breakout bored with a USB breakout board, Motors Earl working properly but my wireless MPG is not working properly, it is jerky when to try to move across the table, is there a setting that I missed?

  • i have cnc router. when I do text I have to flip it upsidedown (in software) else it prints backwards. Bottom left is zero and x and y go plus from there. y has dir low checked x does not.

    Is bottom left your zero with regard to screen position, or actual machine position (looking down at the machine)? You will want the zero of the machine to reflect that of the screen. This is to make the safest possible scenario for working with the machine and it insures that the output will match that of the screen.

    User response:
    I'll answer my own question. Unchecked Dir Low on "Y" text now cuts the way you see it in Mach 3. The only thing now is "Y" is plus moving from right to left. I don't think that makes much difference as long as I know that. I'm not sure what will happen if I used a file from someone else. Any opinions?

    buildyourcnc response:
    It is still recommended that the origin is located where you would expect it to be on the machine. It sounds like the origin is at the right. It also helps to orient the keyboard when jogging where the machine movement matches the direction of the arrow keys.

    Click the link to respond:
    i have cnc router. when I do text I have to flip it upsidedown (in software) else it prints backwards. Bottom left is zero and x and y go plus from there. y has dir low checked x does not.

  • What resolution and level of repeatability can one usually expect from a kit-built cnc, and is there a significant difference between timing belt and chain drive systems?

    Repeatability is very good for these machines and can be as low as .001" depending on the way you control the machine. If you use the spindle, you can be moderately aggressive, but you will want to use a finishing pass to make sure the edges are exactly what you would expect. since this is a kit, there will be varying levels of repeatibility depending on how well the kit is assembled and maintained. Calibration, as with all machines, is a critical aspect of keeping repeatibility over time.

    Timing belts and chain are about the same when it comes to precision as long as the chain wraps most of the drive sprocket. There are differences to each of these systems as Kevlar with steel cables impregnated within the Kevlar and the steel used in roller chain have different coefficients of linear expansion (the expansion and contraction over temperature change), and roller chain may stretch over time, so it is important to maintain the machine by tensioning the chain and timing belt, and calibrating the machine over time and when the temperature changes significantly.

    Click the link to respond:
    What resolution and level of repeatability can one usually expect from a kit-built cnc, and is there a significant difference between timing belt and chain drive systems?

  • Can the vertical CNC router do about what a horizontal router can, like cutting out 3/4" cabinet doors from a 4'X8' formica clad sheet? If so, how do you hold it - with Vacuum? Is a vacuum system available?

    Our hold down method is screws. For a 4'x8' 3/4" sheet, we use 6 screws around the perimeter of the sheet. This provides sufficient hold down for milling. For the vertically oriented machine, the sheet also rests on a small ledge, making it easy for the board to maintain position while fastening.

    Click the link to respond:
    Can the vertical CNC router do about what a horizontal router can, like cutting out 3/4" cabinet doors from a 4'X8' formica clad sheet? If so, how do you hold it - with Vacuum? Is a vacuum system available?

  • 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?

    The best way to determine the cutting speed is to determine this with respect to the edge quality you desire. This recommendation generally comes from the major end mill manufacturers.

    The feedrate (travel speed) should be determined by the chip load of the end mill, the number of flutes, material of the end mill (Solid Carbide, HSS - High Speed Steel, Cobalt, etc.) and the RPM of the spindle. You will need to see the manufacturer's specifications of the end mill to determine this information.

    Formula:
    Chip Load = (feed rate IPM)/(Spindle RPM x Number of Flutes)

    or

    Feed Rate IPM = Chip Load x Spindle RPM x Number of Flutes

    Once you find this information, apply this to the material at the full depth of the end mill. If you find that your edge condition is aberrant, pull back on either the speed, or the depth per pass. If the edge condition is acceptable, then push the speed higher until the edge condition starts to deteriorate in quality and then pull back to the accepted level.

    Using this method, you will be able to reduce the wear on the end mil which will be the most expensive consumable on the machine.

    Additional Information:

    Click the link to respond:
    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?

  • When we simulate cutting a part, the part is 40% larger than it should be. Why?

    What software are you using to simulate the CAM machining operations?

    Additional Information:
    I drew my part in ViaCad, opened part in CamBam to produce GCode, then Mach3 to simulate cutting part. Everything worked as it should but part was too large.

    Additional Information:
    It sounds like steps per unit is not calibrated properly. Use the Mach3 to calibrate the axes. In the settings tab, there will be axis calibration labeled just above the reset button. There is a button just just below axis calibration called set steps per unit. When the button is clicked, mach3 will present you with a dialog box asking for a measurement of how far to move the specific axis you need to calibrate (use a number that will not make the machine over run the axis). The machine will move to a certain length. Measure that length and enter it into the next dialog box that Mach3 presents to you. Do this for each axis.

    Click the link to respond:
    When we simulate cutting a part, the part is 40% larger than it should be. Why?

  • I am looking to build a cnc router that will cut 4x8 i wanted to get a cnc kit with some mods i was wondering if there was someone in sales that can help me

    Yes, if you give us a call, we can definitely help you. If you are looking to mod one of our 4'x8' machines, we can provide those changes for you. We have experience with meeting customers' needs where their application requires a machine with small or even large changes.

    Click the link to respond:
    I am looking to build a cnc router that will cut 4x8 i wanted to get a cnc kit with some mods i was wondering if there was someone in sales that can help me

  • I build a 3 axis router CNC the gantry is heavy in aluminium plate, witch plug n'play kit you suggest me 1 or two motor on the longest axis this will be drive with chain?

    What is the weight of the gantry, number of teeth on the drive sprocket and tooth pitch?

    Click the link to respond:
    I build a 3 axis router CNC the gantry is heavy in aluminium plate, witch plug n'play kit you suggest me 1 or two motor on the longest axis this will be drive with chain?

  • Is there a significant difference between timing belt and chain drive systems?

    Repeatability is very good for these machines and can be as low as .001" depending on the way you control the machine. If you use the spindle, you can be moderately aggressive, but you will want to use a finishing pass to make sure the edges are exactly what you would expect. since this is a kit, there will be varying levels of repeatibility depending on how well the kit is assembled and maintained. Calibration, as with all machines, is a critical aspect of keeping repeatibility over time.

    Timing belts and chain are about the same when it comes to precision as long as the chain wraps most of the drive sprocket. There are differences to each of these systems as Kevlar with steel cables impregnated within the Kevlar and the steel used in roller chain have different coefficients of linear expansion (the expansion and contraction over temperature change), and roller chain may stretch over time, so it is important to maintain the machine by tensioning the chain and timing belt, and calibrating the machine over time and when the temperature changes significantly.

    Click the link to respond:
    Is there a significant difference between timing belt and chain drive systems?

  • I'm trying to build my CNC router 3m*1.3m, but i'm not sure what is the type of stepper motor i should pay, all my CNC body is Al. I need to bay 4 Stepper motors, 4 drivers, spindle, inverter, and i don't know what is the type of controller ?

    The size of the stepper motor is measured in holding torque, generally oz/in. You will determine the torque loads of your axes when selecting steppers. Once you know which stepper you need, the drivers and controller board are simple to pair with them.

    Click the link to respond:
    I'm trying to build my CNC router 3m*1.3m, but i'm not sure what is the type of stepper motor i should pay, all my CNC body is Al. I need to bay 4 Stepper motors, 4 drivers, spindle, inverter, and i don't know what is the type of controller ?

  • ReplicatorG says my white ant extruder is at 500 or more. I've replaced the electronics on the printer but that hasn't fixed it what else can I do?
  • I have a blueChick version 4.2 CNC Machine with no schematics for it is there anyway possibly i can get them so i can finish putting my cnc together

    To assemble the blueChick v4.2, you will need two sets of instructions, the assembly instructions for the main body and mechanicals of the CNC machine, and the instructions to connect and test all of the electronics.

    The assembly instructions are located at this URL towards the bottom of the page (click on each picture to get a larger view):

    https://www.buildyourcnc.com/blueChickVersion42CNCMachineKit.aspx

    The instructions to connect and test the electronics can be found at this URL:

    https://www.buildyourcnc.com/CNCElectronicsandWiring.aspx

    Click the link to respond:
    I have a blueChick version 4.2 CNC Machine with no schematics for it is there anyway possibly i can get them so i can finish putting my cnc together

  • I AM PUTTING TOGETHER THE BLACKFOOT AND USING A PORTER CABLE ROUTER. CONFUSED ON HOW TO RELAY ROUTETR WITH USB BOARD. IS THERE ANOTHER SWITCH THAT GOES BETWEEN BOARD ROUTER SO PLANET CNC CAN TURN PERHAPS VACUUM OFF?

    We are currently working on a relay board that will connect to USB breakout board, and the router/spindle for both the on/off function. Unfortunately we still do not have it completed or ready to be placed on our website, but it is in the final stages of testing. Please check back regularly for updated stock!

    Here is a link to a tutorial for a DIY relay circuit:



    There is no vacuum control on the Planet-CNC program, however you could use the same concept of the router/spindle on/off using the relay circuit. Although you will have to use either the flood or mist function for the vacuum.

    Click the link to respond:
    I AM PUTTING TOGETHER THE BLACKFOOT AND USING A PORTER CABLE ROUTER. CONFUSED ON HOW TO RELAY ROUTETR WITH USB BOARD. IS THERE ANOTHER SWITCH THAT GOES BETWEEN BOARD ROUTER SO PLANET CNC CAN TURN PERHAPS VACUUM OFF?

  • The instructions for installing the USB board say there should be a blue LED light up when computer is connected. I get a flashing red LED that goes solid when I start

    This is correct if it is the Mach3 USB controller. You will also get a rapid flashing led if you jog the machine (assuming the machine is not in reset mode or e-stop mode).

    Click the link to respond:
    The instructions for installing the USB board say there should be a blue LED light up when computer is connected. I get a flashing red LED that goes solid when I start

  • GreenBull 5x10 X axis shutters and spins out with acceleration at 1 in StepCon, is there anything else I can check?

    If your axis shutters and will not move unless moved by another force, that sounds like your acceleration is set too high. Lower the acceleration until it works well, then lower it a bit more to have a margin of safety.

    Users response:
    I've lowered my acceleration to 1 in the StepCon program and it still shutters when I jog it, anything else I could check?

    Buildyourcnc response:
    IF that didn't work, try swapping the X and Y drivers. That way you will pinpoint if the issue is the driver. If the proplem persists, then there may be an issue with the motor itself.

    Buildyourcnc response:
    The X and Y drivers can be easily swapped by swapping only the motor wires.

    - Remove the x-axis motor wires from the X driver.
    - Remove the Y motor wires from the Y driver.
    - Insert the X motor wires into the Y driver.
    - Insert the Y motor wires into the X driver.

    Buildyourcnc response:
    Now the Y-axis will move the gantry. Test the Gantry movement by moving the Y axis using the up and down arrow keys (mach3).

    Users response:
    Problem is now solved, I switched the X and Y at the redFly and got the same problem, so then I undid the wires going to each motor and switched them there and it I had a bad solder point in the X axis connector, thank you for the help

    Buildyourcnc response:
    You're very welcome. We will make sure to thoroughly check the solder points on the cable connectors prior to a redFly delivery.

    Click the link to respond:
    GreenBull 5x10 X axis shutters and spins out with acceleration at 1 in StepCon, is there anything else I can check?

  • Hi there, I have a cnc table that I built but I am looking for a higher powered router because I am using the table for flattening slabs with a large straight bit. Would you have any recommendations for the type of router I should buy? Also do you sell large bits for flattening slabs?

    I would highly recommend a spindle and VFD rather than a router.

    Spindles:
    - Have a far longer life longer than a router. You will probably go through a few routers before the end of the spindle's life.
    - Are quieter than routers
    - And the water cooled spindles we stock do not blow the chips into the air. Chips are much easier to capture with or without a dust removal system.

    You can find our spindles here:
    https://www.buildyourcnc.com/SpindlesAndAccessories.aspx

    Once you get your first spindle, you will never go back to routers. Routers are great for handrouting work, but not the best for continuous CNC milling.

    Click the link to respond:
    Hi there, I have a cnc table that I built but I am looking for a higher powered router because I am using the table for flattening slabs with a large straight bit. Would you have any recommendations for the type of router I should buy? Also do you sell large bits for flattening slabs?

  • I have not used my CNC router (Mach3, USB interface board) for several months. When I tried to use it, all 3 stepper motors moved extremely slowly. Where should I start troubleshooting?

    If your motors turn very slowly using your Mach3 USB board, then either the pulse from the board is being output at a slow rate or the motor drivers are set to a higher than expected microstepping:

    The Mach3 USB board outputs the pulse rather than the computer, but Mach3 controls this pulse frequency within the motor tuning section. First, determine if the travel distance is correct with the computer and the physical travel of the machine.

    If the travel is different, then your stepper motor driver's microstepping is incorrect, or the steps per inch/mm in the motor tuning within Mach3 is incorrect.

    If the travel is correct, then simply change the velocity and acceleration parameters to your desired level. If Mach3 will not achieve the velocity you desire, then decrease your stepper motor driver's microstepping setting, readjust the step per inch/mm in mach3 and readjust the acceleration and velocity to your desired levels.

    Click the link to respond:
    I have not used my CNC router (Mach3, USB interface board) for several months. When I tried to use it, all 3 stepper motors moved extremely slowly. Where should I start troubleshooting?

  • Hi, I am thinking of making a CNC router that I can use in woodworking. I am very happy if you can help me with the necessary parts for this

    Ok, sure. Let's get the discussion started. Please respond with your questions on this FAQ

    Click the link to respond:
    Hi, I am thinking of making a CNC router that I can use in woodworking. I am very happy if you can help me with the necessary parts for this

  • My blackfoot 4x8 Starts sending erratic commands to the machine randomly in the middle of a program or freezes altogether. Replaced USB Cable, updated software, updated firmware, tried other computers. What else should I do?

    If the computer has been tested to be functional, it is most likely the breakout board which is faulty. Replace the breakout board and it should solve these issues.

    Click the link to respond:
    My blackfoot 4x8 Starts sending erratic commands to the machine randomly in the middle of a program or freezes altogether. Replaced USB Cable, updated software, updated firmware, tried other computers. What else should I do?

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