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Question #: 12219

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

Current Solution

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.

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Other Possible Solutions to this Question

  • Re: From Sketchup ... There are always software version problems with different computer setups. Please, what is the specific hardware and software used to make this system?

    I need more information to properly answer this question. Are you referring to computer hardware to make SketchUp work, or how to setup a CNC machine to work with SketchUp?

    Click the link to respond:
    Re: From Sketchup ... There are always software version problems with different computer setups. Please, what is the specific hardware and software used to make this system?

  • What 1/2" collet and nut do I use for the Greenbull with the 2KW spindle? I want to order the Onsrud Spoilboard surfacing cutter.
  • i have a redfly box for a greenbull 5x10 do I need to load a firmware to use planet cnc or is it already done

    For our redFly there is no need for firmware, however you will need to purchase a license for the board. Which you can buy here: (http://planet-cnc.com/product/cnc-usb-controller-license/)
    The license is to completely unlock the software Planet-CNC.

    Click the link to respond:
    i have a redfly box for a greenbull 5x10 do I need to load a firmware to use planet cnc or is it already done

  • Im in the market for a laser cutter with the ability to cut 8'x4' boards (different materials) and up to 5" height. I bought a greenbull 10'x5' a while back from you guys

    Here's a link to the blackTooth laser that we sell, https://www.buildyourcnc.com/blackToothLaserCutterAndEngraver.aspx. It will vary depending which materials you are using, but keep in mind on how deep you are cutting since the blackTooth only cuts 1/4" inch(dept) at a time.

    Additional Information:
    We will be carrying a 8' x 4' laser cutter in the near future. We will also design an attachment for the GreenBull to contain a laser tube at the head of the machine to convert a greenBull into a laser cutter.

    Click the link to respond:
    Im in the market for a laser cutter with the ability to cut 8'x4' boards (different materials) and up to 5" height. I bought a greenbull 10'x5' a while back from you guys

  • I am looking at purchasing the greenbull 5X system with the laser/spindle combination. Can the laser do both rastered engraving as well as vectored cutting with the same breakout board and software? If I have this wrong please let me know what would be needed to accompish this.

    You can do raster and vector engraving on the greenBull laser/spindle combination. The methods of this process is not accomplished in the same way as the typical laser machines where CorelDRAW is used. The Mach3 laser plug-in can be used for the raster engraving and standard CNC g-code can be used for vector cutting and engraving.

    The raster method will not be fast on the greenBull since the z-axis is heavy and there are inertial limitation on doing fast raster back and forth movement. Vector is the best use of this machine.

    Click the link to respond:
    I am looking at purchasing the greenbull 5X system with the laser/spindle combination. Can the laser do both rastered engraving as well as vectored cutting with the same breakout board and software? If I have this wrong please let me know what would be needed to accompish this.

  • While motor tuning what are the recommended steps per inch, velocity, and acceleration for the GreenBull CNC?

    In the customer service live, just enter "motor tuning" and it will give you a list of all the recommended or default settings for our machines. However the acceleration and velocity for the greenBull(other machines) will be an actual determination on your trials. You will want the highest possible acceleration and velocity without the motors stalling, so you can do increments of ten to be on the safe side, if it is too slow try increments of 25.

    The steps per inch is dependent on the microstepping:
    Steps/Inch for the x and y
    Steps = 200 motor steps per revolution x 16 microsteps = 3200 steps
    Inches = sprocket number of teeth x pitch of the sprocket = 14 x .25" = 3.5 inches
    steps/inch = 3200 / 3.5 = 914.28
    This is really a starting point. You will then need to use the mach3 calibration function to get the perfect steps/inch value. Use as long a measurement as possible when calibrating.

    Velocity:
    Start with a value of 1000 ipm. Increase this value with a relatively low acceleration at about 10. You will notice at a particular velocity that it will stall. This is your stall velocity. I would take the stall velocity and reduce it by about 30% to 50% which should give you a good final safe velocity.

    Acceleration:
    Once the velocity is found, raise the acceleration until it start to stall at a low velocity. Reduce the acceleration by about the same percentage to stick with a safe acceleration.

    The acceleration is mostly dependent on torque (current) and the top speed is dependent on the amount of voltage.

    Give some tests with all of the axes running at the same time. If you notice and stalling, reduce velocities and acceleration depending on when the stall happens (top end, or acceleration curve).


    X-axis
    “CW8060 (6.0A) Driver”
    Set to 5.43A, 1/16 Microstep
    Dipswitches: 01100110 (“0”=down, “1”=up)
    Mach3 Motor Tuning: 914.29 steps/in
    Y-axis
    “CW8060 (6.0A) Driver”
    Set to 5.43A, 1/16 Microstep
    Dipswitches: 01100110
    Mach3 Motor Tuning: 914.29 steps/in
    Z-axis
    “CW8060 (6.0A) Driver”
    Set to 5.43A, 1/4 Microstep
    Dipswitches: 01100100
    Mach3 Motor Tuning: 1600 steps/in

    Additional Information:


    Additional Information:


    Additional Information:
    4th axis


    Additional Information:

    Click the link to respond:
    While motor tuning what are the recommended steps per inch, velocity, and acceleration for the GreenBull CNC?

  • Whats the maximum recommended speed to lase (engraving not cutting) a shape (say triangle) using the greenBull hybrid?

    The feedrate at which to engrave using a CO2 laser will depend on the material, depth of engraving and intensity of the laser output. For instance, if engraving plastic, you can run the machine at a very high feedrate (i.e. 100-500 ipm) and a very low intensity. In converse, anodized aluminum will require high intensity and moderate feedrate. Engraving woods will require fast or slow feedrate and high or low laser intensity depending on the result desired.

    With the greenBull, be careful with changes in direction at high feedrates as there is a very high amount of inertia with all of the components on the gantry. It is good to test raster vs. vector for some engraving patterns.

    Additional Information:
    I should have specified my exact question better. Sorry. Where you say "be careful with changes in direction at high feedrates as there is a very high amount of inertia", what is the maximum allowed acceleration (conversely deceleration) you recommend using.

    Click the link to respond:
    Whats the maximum recommended speed to lase (engraving not cutting) a shape (say triangle) using the greenBull hybrid?

  • X axis won't move on 5x10 GreenBull, it just shutters unless I manually with my hand give it a push then it will jog. What should I 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:
    X axis won't move on 5x10 GreenBull, it just shutters unless I manually with my hand give it a push then it will jog. What should I check?

  • IF I PURCHASE A GREENBULL 6X LONG Z CNC MACHINE KIT AND MACH3, WHAT ELSE WOULD BE REQUIRED TO ASSEMBLE THE WORKING MACHINE? HAVE CAD SOFTWARE.

    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:
    IF I PURCHASE A GREENBULL 6X LONG Z CNC MACHINE KIT AND MACH3, WHAT ELSE WOULD BE REQUIRED TO ASSEMBLE THE WORKING MACHINE? HAVE CAD SOFTWARE.

  • If I purchase a greenBull 6X Long Z CNC Machine Kit and Mach3, what else would be required to assemble the working machine? I have CAD software.

    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:
    If I purchase a greenBull 6X Long Z CNC Machine Kit and Mach3, what else would be required to assemble the working machine? I have CAD software.

  • I need your assistance... I have two items left to setup on my Pokey57CNC and Mach4, Home switches and Spindle Speed. I have watched the videos, but they are for Mach3 and the screens are different in Mach4. Can someone please explain the setup of these two items in Mach4?
  • I have your USB controller sitting here and want to control it with something other than PlanetCNC control software?

    The USB controller will only work with the Planet-CNC software. This software is well made and will provide great functionality. The planet-cnc software delivers instructions to the microcontroller on the board and the microcontroller will send out the pulse trains needed to move the machine correctly.

    There are two main alternatives if you want to use the mach3 software:
    First, get a parallel port card and add it to your computer and get a parallel breakout board. If you have a laptop/notebook computer, this will not be possible.
    Second, if you have a laptop, or really want to use the USB as the main interface for controlling the machine, you will need to get the smoothstepper board which works with mach3. The price combination is much higher than the USB controller with planet-cnc, but will work with Mach3.

    Additional Information:


    Additional Information:


    Additional Information:
    The planet cnc controller can be prone to electrical interference and has been known to cause such problems. In the first instance try to use a quality double sheilded USB cable, hopefully this will fix your problem. Alternatively you may need to sheild your limit switch, estop and or motor cabling. My pick is that a quality USB cable will fix it though, worked for me.

    Click the link to respond:
    I have your USB controller sitting here and want to control it with something other than PlanetCNC control software?

  • 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?

  • Hello, I have a Greenbull almost ready to work and I am trying to calibrate the machine, what are the specifics values as steps per units (SPU), ….. to load in planet cnc software to do the best accuracy as possible. My currents values are standar: Steps/unit 200.000, int speed 0.00, Maximun speed 0.00 and Acceleration 15.000 for each axes. Thank for your help.

    The greenBull uses roller chain for the X and Y axes. The drive sprockets have 14 teeth and the pitch (from crown to crown, or pin to pin measurement) is 1/4" (0.25 inches). You will need the pitch circumference which is: 14 * .25 = 3.5 inches. We need to find the steps per inch (steps/inch). We now have the inches for one full revolution. Now we need to find the number of steps for one full rotation of the motor. For these sprockets, I find that 16 microsteps is best. Make sure that the drivers for the X and Y axes are set to 1/16 microstepping. The motor have 200 steps per rotation, so the total steps with 1/16 microsteps is 200 * 16 = 3200. So the steps/inch is 3200 step / 3.5 inches = 914.286.

    The velocity should be around 400-1000. Test various values for velocity and make sure that no stalling happens. Start with a very low acceleration and determine it's top velocity. When the top velocity is found, reduce the velocity to give you a good factor of safety. Then increase the acceleration until it stall at a low velocity and then reduce the acceleration to give you a good factor of safety for acceleration.

    Do the same thing for the z-axis. The lead screw pitch circumference is 0.5 inches (2 turns per inch or 5starts/10tpi).

    Click the link to respond:
    Hello, I have a Greenbull almost ready to work and I am trying to calibrate the machine, what are the specifics values as steps per units (SPU), ….. to load in planet cnc software to do the best accuracy as possible. My currents values are standar: Steps/unit 200.000, int speed 0.00, Maximun speed 0.00 and Acceleration 15.000 for each axes. Thank for your help.

  • 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?

  • how do you automatically turn on the router with pokeys57cnc and mach3. Mach3 is different from the mach4 example "step by step guide".

    There is a video on this page:
    https://www.buildyourcnc.com/item/electronicsAndMotors-electronic-component-breakout-Mach4-mach3-USB-ethernet-Board
    that demonstrates the start and stop for a spindle with the Pokeys57CNC controller and Mach3. The video is titled, Spindle Start/Stop Control.

    If you are trying to start/stop a router rather than a spindle, all you need to do is apply the same concept of using the relay by passing the black (live) wire of the power cable through the relay. The Mach3 configuration is the same.

    Click the link to respond:
    how do you automatically turn on the router with pokeys57cnc and mach3. Mach3 is different from the mach4 example "step by step guide".

  • Helo. I'm using Meshcam to generate the toolpaths. What type of files should I "save as" for the greenbull CNC using Mach3 with the UC100 USB to Parallel?

    The file type to save for use with Mach3 is .tap or .nc. Make sure that you specify Mach3 as the post processor in Meshcam.

    Click the link to respond:
    Helo. I'm using Meshcam to generate the toolpaths. What type of files should I "save as" for the greenbull CNC using Mach3 with the UC100 USB to Parallel?

  • For cutting with the BlackTooth, what is the best type of clear plastic/acrylic to use, and can you recommend a source?

    The blackTooth will cut acrylic very easily. The type of acrylic (cast or extruded) is not important since the acrylic itself has 100% absorption with CO2 lasers. Any plastic retailer, even the home improvements stores will have sheets of acrylic.

    Avoid using plastics that will off-gas toxic and corrosive fumes. One example is PVC which is Polyvinyl Chloride. The burning of that material will exhaust chloride into the air and combine with the hydrogen in the air causing a chemical reaction yielding hydrochloric acid which is corrosive and highly toxic to humans.

    Always read the MSDS (Material Safety Data Sheet) for any material that you intend to burn with the CO2 laser.

    Click the link to respond:
    For cutting with the BlackTooth, what is the best type of clear plastic/acrylic to use, and can you recommend a source?

  • Still working on GreenBull 5x10 assembly. Putting together the Z axis my motor mounts don't like the video, so I don't know which one goes where and in what orientation?