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General Mach Discussion / Re: Spindle speed sensing on a Bridgport
« on: July 25, 2012, 09:17:22 AM »
When I had the old step pulley Bridgeport I just cut a slot in the top pulley as I never used that ratio with the VFD. I then used an opto, Optek OPB917b.
If you are going to be making the pulleys then it should be fairly easy just to leave a bit extra meat on the top then shove in a grooving tool deep enough for the opto to fit in and then just slot out a bit about 10mm wide on the mill to trigger the opto.
Hood
If you are going to be making the pulleys then it should be fairly easy just to leave a bit extra meat on the top then shove in a grooving tool deep enough for the opto to fit in and then just slot out a bit about 10mm wide on the mill to trigger the opto.
Hood