[ Log In ]
[ Register ]
NEW: CNC Router PLANS Available for all of our Newest CNC Models!! Click here to "Design Your CNC".

Question #: 835

Question: 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?

Current Solution

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.

Respond:

Other Possible Solutions to this Question

  • 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?

  • 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 am looking at 2 of your motor drivers. 1 is the 1/64 step and the other is 1/256. What is the difference between the two?

    Stepper motors are designed to move in specific increments; these increments are called "steps". For example, a common standard is for 200 steps per full revolution. Microstepping is a method to send signals to the motor to move only a fraction of a full step at a time. For example, if a motor has 200 steps per revolution and is microstepped 1/16, then effectively there are 3200 small step movements (microsteps) per revolution instead of 200 larger ones. This makes the motion of the motor much smoother and more precisely controllable, at the cost of decreased holding torque.

    Here are is a good references for stepper motor theory: http://users.ece.utexas.edu/~valvano/Datasheets/StepperMicrostep.pdf

    And Wikipedia has a good overview as well:
    https://en.wikipedia.org/wiki/Stepper_motor

    Click the link to respond:
    I am looking at 2 of your motor drivers. 1 is the 1/64 step and the other is 1/256. What is the difference between the two?

  • I am looking at 2 of your drivers. 1 is the 1/64 step and the other is 1/256. What is the difference between the two?

    Stepper motors are designed to move in specific increments; these increments are called "steps". For example, a common standard is for 200 steps per full revolution. Microstepping is a method to send signals to the motor to move only a fraction of a full step at a time. For example, if a motor has 200 steps per revolution and is microstepped 1/16, then effectively there are 3200 small step movements (microsteps) per revolution instead of 200 larger ones. This makes the motion of the motor much smoother and more precisely controllable, at the cost of decreased holding torque.

    Here are is a good references for stepper motor theory: http://users.ece.utexas.edu/~valvano/Datasheets/StepperMicrostep.pdf

    And Wikipedia has a good overview as well:
    https://en.wikipedia.org/wiki/Stepper_motor

    Click the link to respond:
    I am looking at 2 of your drivers. 1 is the 1/64 step and the other is 1/256. What is the difference between the two?

  • I was wondering what was the difference between the two pair of goggles you are selling for the blacktooth. The tinted laser goggles and the Honeywell laser CO2 goggles

    The Honeywell brand goggles meet ANSI certification Z136.1, relating to the safe use of lasers, and are calibrated to optimally block the specific wavelengths of light produced by CO2 lasers (the details are available in the website description here: https://buildyourcnc.com/item/laser-components-goggles-safety-honeywell.) The generic tinted goggles also block the specific CO2 laser wavelengths, but a good deal of other wavelengths as well. That and frame style variation is the basic difference.

    Click the link to respond:
    I was wondering what was the difference between the two pair of goggles you are selling for the blacktooth. The tinted laser goggles and the Honeywell laser CO2 goggles

  • What is the difference between a NEMA 23 and NEMA 24 motor? can I use either one on a machine?

    The frame size difference of the NEMA 23 and 24 is very slight and, depending on the motor mount both will most likely fit. The bigger difference between these stepping motors is the torque. Make sure that the motor that you purchase has the appropriate torque for the axis that it will move.

    Is is safe to go with the higher torque? Or if the torque is too high for what i need is that bad?

    You can use a motor with higher torque. Just make sure to select the correct driver for that motor.

    Additional Information:
    The frame size has nothing to do with torque. Nema 23 means a 2.3" frame. Nema 24 means a 2.4" frame. That's all. Either could have more or less torque depending on speed and power.

    Click the link to respond:
    What is the difference between a NEMA 23 and NEMA 24 motor? can I use either one on a machine?

  • What is the difference between a NEMA 23 and NEMA 24 motor? can I use either one on a machine?

    The frame size difference of the NEMA 23 and 24 is very slight and, depending on the motor mount both will most likely fit. The bigger difference between these stepping motors is the torque. Make sure that the motor that you purchase has the appropriate torque for the axis that it will move.

    Is is safe to go with the higher torque? Or if the torque is too high for what i need is that bad?

    You can use a motor with higher torque. Just make sure to select the correct driver for that motor.

    Additional Information:
    The frame size has nothing to do with torque. Nema 23 means a 2.3" frame. Nema 24 means a 2.4" frame. That's all. Either could have more or less torque depending on speed and power.

    Click the link to respond:
    What is the difference between a NEMA 23 and NEMA 24 motor? can I use either one on a machine?

  • 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?

  • What is the difference between the tinted laser goggles and the Honeywell laser CO2 goggles

    The Honeywell brand goggles meet ANSI certification Z136.1, relating to the safe use of lasers, and are calibrated to optimally block the specific wavelengths of light produced by CO2 lasers (the details are available in the website description here: https://buildyourcnc.com/item/laser-components-goggles-safety-honeywell.) The generic tinted goggles also block the specific CO2 laser wavelengths, but a good deal of other wavelengths as well. That and frame style variation is the basic difference.

    Click the link to respond:
    What is the difference between the tinted laser goggles and the Honeywell laser CO2 goggles

  • What is the difference between the 3 Blacktooth laser packages offered? Specifically, one with/without a computer? Why do I need one? Also, is the $2100 assembled vs the $1700 which is not? What am I paying $400 more for?

    If you read the description the first uses a parallel interface for computer hookup. The second uses USB interface for computer hookup. The third utilizes an integrated computer which is built into the package thus you do not need an external computer.

    Click the link to respond:
    What is the difference between the 3 Blacktooth laser packages offered? Specifically, one with/without a computer? Why do I need one? Also, is the $2100 assembled vs the $1700 which is not? What am I paying $400 more for?

  • In my 4'x8' Blackfoot rig, there is a maximum wire length of 16" between drivers, breakout board, and power supply as well as a maximum wire length of 10' from drivers to motors. What AWG wires should I use to connect power supply to drivers, drivers to motors, and drivers to breakout board?

    What we intend our customers to use for wiring the motors to the drivers will be 4 conductor 20 AWG cable, now for the PSU to Drivers; 16-18 Gauge wire should be used, and drivers to BB(Breakout Board) should be a 24 AWG wires.

    Click the link to respond:
    In my 4'x8' Blackfoot rig, there is a maximum wire length of 16" between drivers, breakout board, and power supply as well as a maximum wire length of 10' from drivers to motors. What AWG wires should I use to connect power supply to drivers, drivers to motors, and drivers to breakout board?

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

    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.

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

  • what is the difference between parallel and USB electronics. I have a laptop that will run the mach3 program.

    The parallel (printer cable) port is uses the computer as its main source of pulse trains to operate the motor driver directly. Parallel ports are a direct connection from the processor commonly referred to as GPIO pins (General Purpose I/O pins) and provides a convenient and powerful way to interface with the computer. The parallel breakout board is included in those kits only to condition those signals for use with the drivers.

    The USB serves at the actual controller, sending the pulse trains, but the computer sends simple human readable instructions to the USB controller to tell the controller how to send pulses.

    The non-technical differences that may serve as the most important information to you is that the parallel configurations allow for a wider variety of industry standard software that can be used to control the cnc machine. The USB that we offer requires the operator to use a software called Planet-CNC software which is a very well made and feature full cnc control software.

    Additional Information:


    Additional Information:

    Click the link to respond:
    what is the difference between parallel and USB electronics. I have a laptop that will run the mach3 program.

  • Which Porter Cable router should I purchase? The instructions say the 800 series, but I can't purchase an entire series, and don't know the difference between them.

    The 800 series of Porter Cable routers all have the same diameter; therefore, you can purchase the latest model of that series and you should be fine with the fit for our router mounts.

    Click the link to respond:
    Which Porter Cable router should I purchase? The instructions say the 800 series, but I can't purchase an entire series, and don't know the difference between them.

  • Is there any precision or accuracy difference between the vertical and blacktooth lasers?

    I will address the two separately (precision and accuracy):

    Precision (repeatability):
    This is most closely related to the resolution. The blackTooth uses the same mechanical drive (timing belts and pulley) of the same ratios and specifications, so the two machines will be the same in this respect.

    Accuracy:

    The output of the machine (the final physical work) matching the input given to the machine (the design data or instructions for the machine to product the physical work. This has to do with both resolution and how well the machine will hold up over time and through environmental changes.

    With that said, both machines have very similar attributes in mechanics and structure. The overall structure is made of MDO (Medium Density Overlay) and has a very low coefficient of linear expansion with regards to temperature change, so accuracy will not be affected in any appreciable manner over time with the two machines. The Vertical Laser XL does use more industry standard rails to hold the heavy gantry, but this will be differ appreciably since the blackTooth will exhibit rigidity by virtue of its size.

    It really is best to consider the application and size as the main aspects of deciding between these two machines.

    Hope this helps.


    Additional Information:
    We're looking at getting the vertical so we can run both large and small jobs on the same machine. It sounds like running a small job on the vertical (using a positioning jig) would provide results at least as
    good as running the same job on the blacktooth. Does this sound about right?

    Click the link to respond:
    Is there any precision or accuracy difference between the vertical and blacktooth lasers?

  • I'm intending to order a black toe machine for shipping to New Zealand. Postage will be a very significant part of the cost. What components do people buy in follow up ordets that may make sense to add to my order?

    To have a complete kit, these will be the following items that are most common to add to the order:
    Motor Cable (20 AWG 4 conductor) = 30Ft (X-axis 9Ft, Y-axis 10Ft, Z-axis 11Ft)
    Spindle/Inverter 2.2kW either 110V or 220V
    Silicone tubing 1/4" ID - 3/8" OD (desired length or 24' to have your water cooling container right next to the machine)
    Water pump either 110V or 220V
    Cable carrier (cable management), default length: 5Ft.

    Other accessories:
    Different collets 1/2" or 1/8"
    End Mills

    Please call: 281-815-7701 for further assistance on purchase

    Click the link to respond:
    I'm intending to order a black toe machine for shipping to New Zealand. Postage will be a very significant part of the cost. What components do people buy in follow up ordets that may make sense to add to my order?

  • I can't spot the differences between 4'x8' blackFoot and the 4'x8' greenBull (except for laser head option): please, can you tell me?

    Only our greenBull CNC machines will be able to use the long Z-axis, due to structural construction of the greenBull over the blackFoot.
    The height from the table top to the bottom of the gantry is: 4.25"

    Both the maximum cutting height and diameter, will be dependent on the specific end mill/router bit you plan on using, since they can vary in length.
    The maximum cutting height (useful to engrave or cut material)is: with spoil-board 3.875", without a spoil-board is 4.625"
    The maximum diameter will (estimated) is: 3"

    Specifically dealing with our greenBull long Z-axis CNC machines, depending on how you specifically design the table you can have more cutting height and a larger diameter clearance. If you only create a frame for the machine with a hollow center(adjustable midsection), allowing you to have a greater clearance.
    Similar table image here: (https://buildyourcnc.com/Item/cnc-machine-greenBull-v4-6X#prettyPhoto/5/)

    Click the link to respond:
    I can't spot the differences between 4'x8' blackFoot and the 4'x8' greenBull (except for laser head option): please, can you tell me?

  • WHAT IS THE DIFFERENCE BETWEEN PARALLEL AND USB ELECTRONICS COMBOS MOTOR KITS

    The parallel (printer cable) port is uses the computer as its main source of pulse trains to operate the motor driver directly. Parallel ports are a direct connection from the processor commonly referred to as GPIO pins (General Purpose I/O pins) and provides a convenient and powerful way to interface with the computer. The parallel breakout board is included in those kits only to condition those signals for use with the drivers.

    The USB serves at the actual controller, sending the pulse trains, but the computer sends simple human readable instructions to the USB controller to tell the controller how to send pulses.

    The non-technical differences that may serve as the most important information to you is that the parallel configurations allow for a wider variety of industry standard software that can be used to control the cnc machine. The USB that we offer requires the operator to use a software called Planet-CNC software which is a very well made and feature full cnc control software.

    Additional Information:


    Additional Information:

    Click the link to respond:
    WHAT IS THE DIFFERENCE BETWEEN PARALLEL AND USB ELECTRONICS COMBOS MOTOR KITS