Centroid Community CNC Support Forum

An issue we are having is setting up the speeds for the three available in the gear box. The gearbox changes are manual, with two levers pushed on the front of the machine that trigger that trigger switches. I believe that that the switches are wired into the Oak board correctly, the three green lights/dots go on when switched from gear to gear in three different lights corresponding to the gear positions.

The problem is the spindle speeds do not check with a manual tachometer, not even close. Lowest gear is a 19.5 : 1 gear box ratio and parameter 65 is set to .0480, this runs true to the tach, gcode S speeds, as well as the tach on the computer display. Middle gear is 7.5 :1 reduction and parameter 66 is set to .38 . This runs way too slow, and when we tried other numbers in the parameter the speed didn’t change. The top gear is a 1:1 ratio. The parameter 67 is set to .130. This also runs too slow but we tried a bunch of numbers starting with 1 and working down. No effect on the spindle speed again.

What should the parameters be?

Another issue with the X axis is an alert message that “Warning axis home differs by 7122 (number changes) counts. see photo.

Hello,

Your High Range is the default range and 1:1 it does not get set in any of the Ranges or Parameters
Your Low Range, Parameter 65 is 19:5 to 1 so 0.0513
Your Medium Range, Parameter 66 is 7.5 to 1 so 0.13333

You do not have a 4th Range.

The home differs error means your limit switch is sticking and the motor turned farther to clear the switch as compared to the last time it homed.

Your PLC program appears to recognize only high range and low range.

If you want INP14 "SpinMedRange_I" to cause selection of the second gear (low-mid, Parameter 66) then you will need to add a line to the PLC program, around line 2435.

For example, change: to: Calibrate the high-range maximum spindle speed, on the Control Configuration screen, first (with the spindle in high range of course). Once you have accurate speeds in high range, then set Parameters 65 and 66 for low and mid range.

Wow thanks, that worked! It took a little guessing to find the right directory but there it was in front of us. I still have a few minor mechanical things to finalize like the sticky over travel switch and some wire ties in the electrical cabinet and I will be ready to make some chips!