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« on: January 23, 2013, 03:54:22 AM »
Adding more slots will not help as you can only use a single slot in Mach now, well not strictly true so I will elaborate.
Previously you could use a disc with many slots but have one wider as the index, this was set up as a timing signal rather than the Index. It was found however to be no better and likely even worse with regards threading so it was abondoned and now the only valid setup is the Index.
You could have a disc with two or more accurately milled slots and use the spindle pulleys ratio to make Mach read the rpm as 1 per rev. Would it help? I have no idea but it may at the lower revs, the problem you may have however is at higher revs the parallel port input is not fast enough to see the multiple slots and thus you get erroneous readings.
I do not think it is a problem with your input, I think it is likely the way Mach does things in the driver but hopefully Rich or someone else that uses the parallel port can confirm or deny that.
Hood