In checking my unit values against the chart shown on the Shopbot wiki,
it appears that my settings do not match what I *think* my motors are.
I have a (No upgrades) 2001 PRT
The circuit board is labeled 2.07 and there are 4 drivers on it.
There is a paper label marked PRT 13101-00409
The software I'm using is Ver 3.4.27
Control box firmware ver = 106
Ini ver 4.27
The motors are Vexta PK296A1A SG 7.2 2phase .25/step with gear boxes built onto them as supplied by Shopbot
The motors each have 4 wires connected. Black, Green, Blue, Red connect to the Shopbot cables with like colors connecting and White on the Shopbot cables connecting to Blue on the motors.
The pinions on X and Y are 30 tooth
The pinion on Z is 25 tooth
My unit values are set at
X & Y 611.1552
This is what the chart says it should be for the 3.6:1 gear ratio and 30 tooth pinions.
Should I assume the Z is also a 3.6:1 gear ratio? If it is, the unit value that works is not what is listed on the chart for my 25 tooth pinion.
Is the chart correct? If it is, then I should be using 733.386 but that doesn't work.
Does the 7.2 label on the motors mean it has a 7.2 gear ratio?
The specs on Oriental Motor web site states they are 7.2:1 gear ratio motors
The Z unit value I am set at is 1833.4656
On the chart in the wiki, that unit value is for the 7.2:1 ratio and a 20 tooth pinion. My pinion on the Z is 25 tooth. I didn't count the teeth but I can see the stamp on it that says 25. The motor is the same as the others. If the motors are using a gear ratio of 3.6:1 why would the unit value not be 733.386? Are the gear ratios on the Z motors different than the X & Y motors even though they are labeled the same?
According to the chart, if I have a 7.2:1 gear ratio and 25 tooth pinion, the unit value should be 1466.772 but that does not travel the correct distance. If I have a 3.6:1 gear ratio and a 25 tooth pinion the chart says the unit value should be 733.386. This also does not work.
As much as I'm able to measure the Z travel, my unit value of 1833.4656 appears to move the correct distance, but it's possible that it's very slightly off - however that unit value is for a 20 tooth pinion and 7.2:1 gear ratio. So this really has me confused now!
All the driver chips on my circuit board are the same. They are marked IMS IM481H