2013/10/1 andy pugh <[email protected]> > On 1 October 2013 07:59, Sven Wesley <[email protected]> wrote: > > > Ah, but of course! > > This is a machine with a gearbox, switching gear at 580 RPM, I think I > need > > to get rid of the motor and make a direct drive to be able to do what I > > want to do (tapping). > > Well, the fact that the cooling fan is on a separate motor does mean > that the end of the main motor shaft is probably clear, and an encoder > could be fitted. > > However, if there is a gearbox then it probably makes sense to use one > of the gearbox gears and a tooth sensor. > > This is how Jon did it: > http://www.pico-systems.com/bridge_spindle.html > > And this is how I did it: > > http://www.cnczone.com/forums/vertical_mill_lathe_project_log/109301-harrison_universal_miller_conversion-2.html#post1212335 > > Thanks Andy. I think there's too much play for rigid tapping with the gearbox, or do you rigid tap with your Harrison? There is a Maho retrofit with a controlled gearbox, that is one option. The other option is to get another spindle with belt drive or another motor get rid of the gearbox. http://www.youtube.com/watch?v=E0rVbVixMw8
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