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Question #: 7980

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

Current Solution

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.

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Other Possible Solutions to this Question

  • I have the build your own CNC kit 3 Axis CNC Machine 2008, were can I get the Gcode or vector files for it ? I wanted to have it laser cut
  • Can you supply a "KIT" to convert my 4060Z CNC to a Laser Cutter? What is the difference capabilities between the 40Watt and 80Watt?

    We can supply all of the laser components, but you will need to determine how to mount the components.

    Additional Information:
    Alternatively, you can purchase our greenBull machine that has the laser/spindle combo head. You can see the laser/spindle head here: https://www.buildyourcnc.com/item/cnc-machine-laser-spindle-combo-head

    Click the link to respond:
    Can you supply a "KIT" to convert my 4060Z CNC to a Laser Cutter? What is the difference capabilities between the 40Watt and 80Watt?

  • Can you supply a "KIT" to convert my 4060Z CNC to a Laser Cutter? What is the difference capabilities between the 40Watt and 80Watt?

    We can supply all of the laser components, but you will need to determine how to mount the components.

    Additional Information:
    Alternatively, you can purchase our greenBull machine that has the laser/spindle combo head. You can see the laser/spindle head here: https://www.buildyourcnc.com/item/cnc-machine-laser-spindle-combo-head

    Click the link to respond:
    Can you supply a "KIT" to convert my 4060Z CNC to a Laser Cutter? What is the difference capabilities between the 40Watt and 80Watt?

  • Just purchased the book "Build Your Own CNC Machine". Can I get hardware and electronics kits and how?

    The electronics (stepper motors, drivers, power supply and interface board) can be found here:
    https://www.buildyourcnc.com/item/electronicsAndMotors-3axis-425-elcombo

    If your computer cannot connect to the parallel breakout board (the interface card), just make sure to inform us that you need the USB alternative.

    Click the link to respond:
    Just purchased the book "Build Your Own CNC Machine". Can I get hardware and electronics kits and how?

  • am interested in purchasing the 80 Watt Vertical Laser XL 4'x8' Laser Cutter and Engraver, what material depth can it cut?

    The Vertical Laser XL's 80 watt CO2 laser tube is capable of cutting lighter material such as wood and plastic at up to 1/2" or 12mm.

    Click the link to respond:
    am interested in purchasing the 80 Watt Vertical Laser XL 4'x8' Laser Cutter and Engraver, what material depth can it cut?

  • I was wondering what the max depth is for something to go into the 40W C02 Laser cutter and engraver with blacktooth

    Hello, I was wondering if the Blactooth laser cutter can engrave in 3d, different depths in the same piece of wood?

    Additional Information:

    Click the link to respond:
    I was wondering what the max depth is for something to go into the 40W C02 Laser cutter and engraver with blacktooth

  • i want to make a cutter laser machine with 4kwatt power so i want to buy all this laser components can you list the parts and cost thanks

    We can lower the price for just the hardware and also for the structure. However we do not have any files, dimensions, for public access.

    Additional Information:
    Would there be any/enough measurement or info on the instructions to extrapolate the dimensions? What would the new pricing be?

    Click the link to respond:
    i want to make a cutter laser machine with 4kwatt power so i want to buy all this laser components can you list the parts and cost thanks

  • What is the z-axis travel for your largest machine?

    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.

    Click the link to respond:
    What is the z-axis travel for your largest machine?

  • How can I convert from Xylotex to yours, four axis with limit switches. Have parallel PC and steppers on machine.

    Sure, the USB interface has a place for 4 axes of limit switches.

    Each axis can have two limit switches: one for the ++ (positive) end and one for the -- (negative) end. The positive end would be the limit switch at the end of the machine that, say the machine has a 4'x8' area, reaches a bit after the 8 foot mark. The negative end would be the limit switch behind the 0 foot location behind the origin. If the origin is in the middle, the negative would be at a little more than the -4 foot end and the positive would be at a bit more than the +4 foot end. Note that you can have more than one switch on each pin where the NC is connected in serial fashion and the NO is connected in parallel fashion (this can be seen on the diagram in the multiple limits switch section). The software configurations for the limits switches are under File -> Settings -> Limit.

    A typical limit switch has three connections on it. These connections consist of COM (common), NC (normally closed) and NO (normally open). The COM would generally go to GND and the NC or the NO would go to the pin. If the NC is used, then the the switch is constantly connected until the switch is pushed (engaged) then the connection from the pin to gnd is broken (open). Use the settings in software to set whether in NC or NO configuration.

    Let me know if this information was helpful (or not) by adding information to this question. Thanks.

    User response:
    Thank you very much for this helpful information. I'm still a little fuzzy on how the 6 limit switches physically connect to each other and to the USB breakout board. You've stated one switch (home) goes to positive and another switch (limit) goes to negative. Are all the GND prongs from all 6 switches connected to each other and going to GND on the breakout board, or no? And the NC prongs, how exactly are they connected to each other? And to the board? There has to be a diagram somewhere shows this visually, no? I don't know how to wire the switches in series or in parallel. I have already physically installed all the switches on the machine and ran the wires to where the board is. Now I just need to know where to plug these wires into the board. Also, taking into consideration that I'm using the Planet CNC software, the only settings I have pertaining to limit switches is "Enable/Disable" for each axis, and the actual limit for each axis. Nothing about NC or NO. Is that only in Mach3?
    Thank you.

    buildyourcnc response:
    On the USB interface, the COM on the switch connects to GND and the NC or NO connects to the input pin (i.e. x++, y--, etc.)

    Limit switch configuration is rather difficult to understand, especially with series and parallel. You can think of series as a single wire going from GND to the axis letter input terminal (i.e. X++ or X--). If the wire is broken, then the circuit is open (or the switch is engaged in a normally closed scenario). Normally closed is like an actual wire, and when engaged, the switch "opens" (breaks the wire). This is why we recommend in some systems that you can put many switches in series on a single pin. When one of the switches is engaged (breaking the connection) then the entire circuit of switches is broken and the machine stops.

    In a parallel scenario, the state of the circuit is always broken until the one of the switches is engaged and the circuit is then closed or connected. The topology looks like a ladder. All the switches connect to both sides of the ladder and the switches are like the runs of the ladder (the horizontal bars that the feet are placed while climbing). Imagine all of the switches broken in this scenario (normally open). It would be like the ladder could be split in two, but if one of the ladder runs (switches) is closed by engaging it, then that run would connect both sides of the ladder and the two sides of the ladder would have a connection.

    There is a diagram on the USB page of the various limit switch configurations. If you need more information (visual and/or otherwise), please let us know and we will immediately add that information to benefit everyone.

    Click the link to respond:
    How can I convert from Xylotex to yours, four axis with limit switches. Have parallel PC and steppers on machine.

  • Can we order a preassembled version of the blacktooth laser cutter and what would the lead time be.

    We do have the option of assembled blackTooth CNC.
    For further information on lead time and quote; please email (customerservice@buildyourcnc.com)

    Click the link to respond:
    Can we order a preassembled version of the blacktooth laser cutter and what would the lead time be.

  • I have been asked to provide an exhaust for the Blacktooth Laser Cutter CO2 40W. I see no specifications or guidelines for exhausting fumes from the machine. Can someone help me?

    Exhausting the blackTooth laser cutter is a very important consideration and should be taken seriously, especially if you are cutting materials that give off toxic fumes when the material is burned. You will want a 4 inch hose to connect from the blackTooth to a blower, and another 4 inch hose to connect from the blower to the outside. The blower should be sufficient to provide completely negative pressure within the laser enclosure so there will be no escape of gasses.

    The connections at the machine, at the blower and at the location the hose exhausts outside should be thoroughly checked for leaks. Use a gasket, or silicone. Once complete, try cutting a non-toxic material that will give off an odor (wood, or non-toxic plastic) and try the system and determine if the smell is present.

    Click the link to respond:
    I have been asked to provide an exhaust for the Blacktooth Laser Cutter CO2 40W. I see no specifications or guidelines for exhausting fumes from the machine. Can someone help me?

  • I just wanted to know what I can expect to pay to build the blackFoot 4'x8' CNC machine, excluding computer, software and router? Is the kit complete or do I have to purchase additional items to finish?

    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:
    I just wanted to know what I can expect to pay to build the blackFoot 4'x8' CNC machine, excluding computer, software and router? Is the kit complete or do I have to purchase additional items to finish?

  • 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?

  • I am interested in your laser cutter package. Can you create a machine with custom length requirements? ie. 36" length

    For the blackTooth laser cutter and engraver, it is not possible to lengthen within its existing enclosure dimensions. The cable management is a bit tight. Call us to discuss.

    Click the link to respond:
    I am interested in your laser cutter package. Can you create a machine with custom length requirements? ie. 36" length

  • if i purchase the 4 Axis Electronic Combos and the Combo #1 with hardware, plans and DVD what else do i need to have a complete cnc machine

    Other items you will need if you are purchasing the electronic combo (motors, drivers, power supply and computer interface) and the hardware and plans kit:

    You will need the wood to create the structure of the machine. You will need a router to serve as the cutting instrument. You will need a computer to control the machine and the software that will serve as the control program. You will also need lead screws and rails (aluminum angles). If you intend to have faster travel than 20 ipm, we recommend purchasing the 5 start lead screws so you can achieve up to 300 ipm. https://www.buildyourcnc.com/item/mechanical-leadscrews-leadnuts-!5-5-starts-10-tpi

    Click the link to respond:
    if i purchase the 4 Axis Electronic Combos and the Combo #1 with hardware, plans and DVD what else do i need to have a complete cnc machine

  • What resolution and level of repeatability can one usually expect from a kit-built cnc?

    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?

  • I am looking at your 3 axis CNC machine kit(part #101) on Amazon. Is the interface on this kit USB?

    The electronics combo with the sku of 101 on Amazon.com includes a parallel interface.

    Click the link to respond:
    I am looking at your 3 axis CNC machine kit(part #101) on Amazon. Is the interface on this kit USB?

  • Is there any way to bring the cost of https://www.buildyourcnc.com/item/cnc-machine-blacktooth-laser-cutter-engraver-40w down if I only need the hardware and components, not the body? I have a cnc waterjet and could cut these parts if dimensions were provided.

    We can lower the price for just the hardware and also for the structure. However we do not have any files, dimensions, for public access.

    Additional Information:
    Would there be any/enough measurement or info on the instructions to extrapolate the dimensions? What would the new pricing be?

    Click the link to respond:
    Is there any way to bring the cost of https://www.buildyourcnc.com/item/cnc-machine-blacktooth-laser-cutter-engraver-40w down if I only need the hardware and components, not the body? I have a cnc waterjet and could cut these parts if dimensions were provided.

  • So the only way to get one of your machines is to buy it already cut, and/or assembled? I can't cut one on my existing machine?

    That is correct, the only manner to get our machines is to buy one of our kits. We do not provide or sell our plans, the only CNC machine you can find on our website will be the scratch build kit and plans which is a 20' x 40' , (https://buildyourcnc.com/Documents/CNC%20Kit%201-1.pdf).

    Click the link to respond:
    So the only way to get one of your machines is to buy it already cut, and/or assembled? I can't cut one on my existing machine?