Preliminary, and for informational use only. Here is the overall schematic for the enclosure: These two gents have been wonderful to deal with, their products are excellent, and I highly recommend them. Connects to the PC via a serial cable.Īrturo runs CNC4PC and Peter runs Homann. Gives acccess to the 6 pins of a PS/2 style mini-DIN connector.įull on pendant with E-stop, MPG, and the works. Homann Designs Mini DIN breakout board $15 Haven’t made any final decisions, but here are some additional candidates I am considering: We need DC at +5 VDC and +12 VDC for various cards, so the CNC4PC power supply does a reasonable job for about $25. I’ll be using a CNC4PC Variable Speed Control board and a Hitachi VFD. See the VFD and Spindle Control page for full details. Handy little card implements Mach 3 Safety Charge Pump functionality. Use it in place of heavy duty terminal blocks. Has a an available DCM-100 load dump circuit ($59.95) to stop the juice right now! The DCM-100 acts as DC distribution for up to 4 axes. See the description above for what this board does.Ĭontrol up to 25A of AC current with a front panel or other lower voltage signal. I plan to mount one on the CNC electronics enclosure where it’ll be close to the computer console, and the other will be mounted on the mill spindle in place of the current power switch so it’s handy if you’re over by the machine. These are the standard red plungers that must be rotated and unlocked before you can restore operation after they have been triggered. I purchased a couple of E-stop switches from CNC4PC. These boards will also be connected in such a fashion that if the 5VDC supply fails, the spindle and coolant will be shut off. In addition, the +5VDC signal will be used as the +5VDC supply for the spindle control board and the coolant relay board. Removing power from the relay will therefore open the contacts and cut AC power to the servo DC supply. The output provides a 5VDC signal to control the relay which will be run in a Normally Open configuration. I’ll use that output to control a larger solid state relay (I’ll be using a 20 amp / 240 VAC unit) that controls the AC power into the servo DC supply. It’s set up to accept the servo fault signals from Gecko Servo drives (which are a bit idiosyncratic), an E-stop circuit, a charge pump input, and a Start button, and do the right thing with an output. I’ll be using the CNC4PC C17 Master Control Board to handle all this power control. And lastly, the E-stop should be a normally closed circuit, so that a break in the wiring triggers the E-stop. If there is a servo fault (possibly because a back g-code program has the spindle chewing at high speed into my Kurt Vise or mill table!), I want an E-stop. When I hit the E-stop on this beast, I want everything to stop! Also, if the charge pump signal from the PC goes dead, that should trigger an E-stop as well. – Port 3: 6 inputs (3 differential and 3 single-ended)ĬNC4PC Smoothstepper Terminal Board $29.55Ī breakout board to allow point to point wiring for a Smoothstepper. – Port 2: 12 outputs, 5 inputs – or – 4 outputs and 13 inputs In fact, I’ll have a spare 6 outputs and 5 or 6 inputs.ĬNC4PC offers the Smoothstepper and a nice little breakout board to go with it: I need 18 outputs and maybe 5 inputs for this project so I’ll be fine with a Smoothstepper. The Smoothstepper offers 2 simulated parallel ports and a total of 24 outputs and 10 inputs. – Spindle index pulse (in case Mach 3 ever does rigid tapping?): 1 input – A, X, Y, and Z-axis limit switches: Requires 4 inputs. – Coolant 1 and Coolant 2 relays: 2 outputs – VFD start/stop and direction signals: 2 outputs – Aux 1 and Aux 2 Axes Step + Dir, possibly for a tool changer. – A, X, Y, and Z-Axis Step + Dir signals to the Geckodrives. Here are all the control signals that have to get from Mach 3 to the PC to some component in the enclosure: This combination of boards specifically addresses the use of the Smoothstepper motion control board, which improves Mach3 performance quite a bit, as well as the use of servos and the need to have electronics that will stop all motion if a servo faults. PC Interface (Breakout Board) and Control Signal Map for the IH Mill If you’re curious about how something like this helps, see my articles on motion control boards for use with Mach3. Due to a query from a customer, I put together this quick page that shows how I set up my CNC4PC boards and Smoothstepper for the Servo setup on my IH mill.
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