Centroid Community CNC Support Forum

Solder the shields to the outer shell of the DE9 connectors. That will connect them to chassis ground.

Just out of curiosity, does it make a difference if you ensure that the feedrate override is at 100% all the time that the threading cycle is running? It should not matter, but I have heard one report of a situation where threading pass starts were not consistently synchronized with the index pulse ...

You may want to test the encoder / prox switch / line driver combination isolated from the control board. Use an external supply to apply +5VDC to pin 9 of your DE9 connector, and 0VDC to pin 2 of your DE9 connector; then measure the voltages on the driver output pins.

If the line driver chip is functioning properly, you should never have 0V across pins 5 and 6. You should either have +3V or -3V, because either pin 5 is high and pin 6 is low, or pin 5 is low and pin 6 is high. The voltages at pins 5 and 6 should never be equal. If you measure 0V across pins 5 and ...

The line driver (transmitter) output is pins 5 and 6, not pins 6 and 7. Line driver pin 5 (DO+) goes to DE9 pin 6. Line driver pin 6 (DO-) goes to DE9 pin 3. If you are measuring voltage from pin 6 to pin 5 (meter on DC volts, red probe on 6, black probe on 5) then you should see about +3VDC when th...

Yes, you can do that. You will need to run the proximity sensor's signal through a line driver interface, so that you get the necessary differential signal going to the encoder input. Attached is an example of the wiring to do this with a DS8921 chip. You could use any of a number of other interface...

Your pulse generator has a single-ended TTL output. The MPU11 and All-in-one DC require a differential line driver input. You either need to replace the pulse generator with one that has line driver output (recognizable by the complementary channels: A, /A, B, /B) or you need to install a TTL-to-dif...

Shouldn't there be an x and y value for each line starting at 14, or am I misunderstanding?

Not necessarily. If you specify I and/or J for the arc center, and leave out X and Y, then the endpoint is implied to be the same as the start point, and you get a full circle.

I am guessing you wanted Z values on each of the G3 circle moves. As the postprocessor wrote it out, you have a G1 move to Z0; ten G3 circles with no Z movement; then a G1 move to Z-.8. So you need a postprocessor that will output Z endpoints with the arcs (or, more generally, will output helical ar...

Yes, that will require explicit support in your PLC program. The M94/4 code just sends a request bit to the PLC. It is up to the PLC logic to decide what, if anything, to do with it. Ajax can probably help you add M10/M11 support to your PLC program, to work in addition to the Aux12 key. If they can...