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Question #: 4699

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

Current Solution

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.

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Other Possible Solutions to this Question

  • 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.

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    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.

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    To control a spindle using the USB CNC interface, you will need a relay board that contains a transistor that can activate the relay with a power source with enough current that can activate the relay. This video explains all of the information you will need to develop this relay circuit:

    &index=44&list=PLE72E4CFE73BD1DE1

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    i have a breakout usb controller iam using a spindle output to active a relay 5V but it didnt work.... whats the problem, what else i need to active that realy 5v 10A?

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    Click the link to add information to this solution:
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    CAD drawings are not furnished with the purchase of a machine.

    Click the link to add information to this solution:
    I have a greenbull 5x Long Z. I thought I read that I would get the CAD files to the machine when I purchased it? I want to make a couple modifications. Thanks!

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    Additional Information:
    Working area setting

    Additional Information:
    Working area setting

    Click the link to add information to this solution:
    what is the recommended firmware for the awc708c laser controller? I see this download on the Sinjoe site: AWC708 Lite Update Firmware 160901L1

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    Click the link to add information to this solution:
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  • WHAT ARE CURRENT RECOMMENDED IEEE EMF OCCUPATIONAL EXPOSURE LEVELS AND GUIDELINES FOR RADIO BASE STATION ANTENNAS?

    The following answer assumes "radio Base Station Antennas" refers to base stations used for personal wireless communications services such as cellular telephone, Personnel Communications Services (PCS), and Enhanced Specialized Mobile radio (ESMR). In the United States, the frequency band allocated for base stations used for personal wireless communications is 869-894 MHz for cellular service, 851-866 MHz for ESMR, and 1930-1990 MHz for PCS. The IEEE exposure limits (maximum permissible exposure—MPE) for occupational exposure (controlled environments where exposures may be incurred by persons who are aware of the potential for exposure) are frequency dependent and are expressed in terms of incident power density. The appropriate value to compare with the MPE is the incident power density averaged over the vertical cross-section of the human body. The occupational exposure limits are also time-averaged over any six-minute interval. The IEEE C95.1-1991 MPE values are shown in the table below:
    IEEE C95.1-1991 Maximum Permissible Exposure (MPE) Values
    Frequency Band Power Density
    General mw/cm2 W/cm2
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    NOTE: f is in MHz
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    R. C. Petersen
    Manager, Wireless and Optical
    Technologies Safety Department

    Click the link to add information to this solution:
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    Click the link to add information to this solution:
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    Click the link to add information to this solution:
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    Click the link to add information to this solution:
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    If there is play within the motor itself, then that motor may be defective. Call us to provide us more detail on this issue.

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    Click the link to add information to this solution:
    I have NEMA 34 motors for a GreenBull 6x12. After 2 weeks of use, my Y axis motor has developed play in the front but not rear of the motor. Is this a motor defect or has something come loose somewhere? Thanks,

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    Click the link to add information to this solution:
    RECOMMENDED TO GET VACCINATED AGAINST INFLUENZA (THE FLU)?

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    a motor stop working and get very hot

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    I'm using Vectric's Aspire for design on my ShopBot. Do you know which output format I need to generate for the LeanGreen?

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  • WHAT LENGTHS OF ROLLER CHAIN DO I USE FOR THE GREENBULL 4X CNC?

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    Click the link to add information to this solution:
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    BYCNC Response:
    Our 40W laser can cut up to about 1/4" materials ranging from wood and acrylic down through lighter materials such as leather, fabric, foam, etc. Speed and final cut are greatly enhanced by an air assist upgrade. We also offer an 80W laser which has approximately twice the capabilities of the 40W.

    Additional Information:

    Click the link to add information to this solution:
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