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« on: February 26, 2014, 05:23:58 PM »
I think the Enc module and the encoder inputs on the IP-A are the same and if I recall Wojtek or Andrew said they were min of 3MHz. On the Chiron I am using the Enc module for rigid tapping and my spindles encoder is set to 32,768 ppr so that is just over 2MHz at max RPM. I am hoping to get time soon to make up a belt and pulley setup for the spindle so that I can get 8,000rpm instead of my current 3,800 rpm, I will just reduce the interpolation of the drives encoder output so that I end up in the 3MHz kind of range.
Regarding the threading, there is the issue of the delayed pull out at the end of each pass and thus an annular groove is cut and that is the only reason I have not bought an IP-A for the big lathe yet as that is not acceptable for a lot of the threads I do.
On the small lathe (Conect) , which has the IP-S, I have done a fair amount of testing and apart from the afore mentioned problem (its a Mach issue BTW ) it threads very well. I can slow the spindle or stop the spindle or speed up the spindle during threading passes via the spindle override and it tracks beautifully in all tests I have done. I even stopped it via the override for quite a while, maybe 10 mins or more, then wound it back up and the thread continued as if nothing had happened.
On the Conect my spindle encoder is 8,000 ppr and geared 2:1 so 16,000 pulses per spindle rev.
I had asked if Andrew could do a M76 in the CSMIO, similar to the M84 for rigid tapping and he said it could be done but time was short for him, so it was unlikely to be done as Mach4 will reportedly solve the problem. Maybe I should ask again if there is any chance of it as looks like Mach4 Turn is not on the horizon yet.
Hood