We are linking to the manufacturer's home or landing pages, and their specific product pages. With plasma systems you really want a 24V BOB with isolation to provide noise immunity. There can be noise issues with VFDs and spindles, and you may want to consider shielded wires or a 24V BOB. With routers and spindles, you can get by with a 5V BOB, but you need to make sure your spindle is grounded properly and that you keep the 5V wires away from the power cables. * Be a step direction controlled Spindle (2 outputs)?ĥ) Will you need any spindle RPM feedback : an index pulse (1 input) or an encoder (3 inputs - A channel, B channel, Index pulse)?ħ) Will you need any other outputs for coolant, mist, lasers, torches, etc.įor lasers type systems you can easily get by with a 5V BOB. * Use a VFD that needs a 0-10V signal for GCode Speed control and one relay (for ON/OFF) or a second relay (for providing Direction (M3 FWD or M4 REV)?
* Use a single relay to turn it on and off from GCode M3/M5 but not have automatic speed control? * Be turned on and off manually? (no outputs) * Rotational axes typically have a home (index) but may or may not have limits. * Z axes usually only have the limit (home) switch at the full retraction height, and don't have a limit switch at the full depth location (you would have already crushed your bit by that point), but plasma or laser systems may have a second limit on their Z. * X and Y axes typically would have a limit switch at the opposite end of the axes, but don't need to have one. * Each home switch will typically be the limit switch for that end of the axis (slave motors are ignored for limit switches) * Each motor (including master and slave motors) will typically have a home switch for 1 input each (the slave motor has a home switch so the gantry can auto square during the homing process). 4 motor drivers would need 8 output pins.
You will need to do your own research to decide what is appropriate for you.Īs you are trying to decide what you will need, here are some common items to consider regarding your hardware needs:ġ) Your EStop (big red switch) should cut power to the motor drivers, but also supply 1 input to the SmoothStepper so the SmoothStepper knows that an EStop event occurred.Ģ) Each motor driver will need 2 output pins, a Step and Dir CW/CCW or Quadrature A & B. Some will work better than others for your needs, and some may not work at all for your needs. This will list all of the commercial BOBs we know of. Please keep in mind that we are not endorsing any particular BOBs, but rather letting you know which ones we know of. One of the questions we are asked the most, is "Which BOB do you recommend?" Since we don't want to play favorites, we are listing each category alphabetically by manufacturer.
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