OK Hood and Angel-Tec, explain this! I bought my secondhand computer off the internet, not that I'm tight but didn't want the hassle of 64 bit (well I am a bit tight when it comes to money). The computer came with loads of programs on it and it had obviously been linked to other computers in an office or school.
I was confused because this creep problem only started when I connected the new computer to my machine. I accidental left the power to my machine on from the last time I was messing with it, so it was still on when I pressed the on button to start the computer. As I pressed the button the spindle started even before I had called Mach3.
That got me thinking is there a signal going down the printer port? As I mentioned there were loads of programs on the hard drive so decided to dump them all as the computer was only going to run Mach3. I dumped AVG software, Kodak printer and photo suite, loads of little files like spybot whatever that is, plus countless interface files. Well touch wood been using the CNC milling for the past hour and the creeping spindle has gone. Could it have been one of the software programs I have deleted that was sending a signal down the parallel printer port connection? That 2.2v signal has disappeared and the spindle has started maintain a constant speed I requested (got a digital rev counter to check the spindle speed). Don't want to speak to soon but I may have solved it, keep you posted. If I have I'm going to write to those guys controlling the Mars Lunar Landing Vehicle and see if they want any help drilling those holes in the Mars landscape.
Hood and Angel-Tec would welcome your thoughts as to if this could have been the problem or was it the fact that I waved a sledge hammer at the spindle earlier in the day. Jim