Let the fun begin !!! ???

[PAULRO]

i decided to carry out some more tests and checked the voltage readings between FIV & GND .

i started with the spindle motor tuning and changed the ''STEPS PER'' using different values and checking the result for change

I also changed the spindle pulley max value just to see if that made a difference

all values recorded were fluctuating by + or - 0.1 volts .

i'm guessing that when i had the spindle control wired in and set up in MACH 3 that the issue of it runing on its own was down to the constant prescence of the 1.5 volts between terminals FIV & GND. i cannot seem to reduce this value as the tables reveal. the ''steps per '' value in motor tuning ( increase or reduction) had no bearing on the much sought after 5 volt target.

on the other hand , because Jazz had mentioned the '' spindle pulley max'' as a possible solution to the voltage target i decided to check that out .
the results show a reduction of the voltage towards the target value of 5 volts using M3 S12000 but the M3 S24000 results drifted below the 10 volt requirement . The ''M5 '' results held firm at the usual 1.5 v
so that is the state of play at the moment.
it would appear the the PWM can deliver a variable range of 5 to 6 volts and is constantly delivering 1.5 volts when spindle is programmed off.
Then again i might be reading the results incorrectly because i do not have the required knowledge to take this problem futher. perhaps there is another solution or variable that can come into play that will change the present outcome