8501
Share Your GCode / Re: Spindle speed increaser for engraving...
« on: December 16, 2009, 10:45:37 AM »
You have got me thinking about this now.
Early radio sets used a ‘slo mo’ drive on the tuning knob using the differential between two circumferential tracks bridged by ball bearings.
Standard ball bearing races are designed to have a differential circumference ratio between the inner and outer tracks of around 2.6 to 1 therefore by holding the outer ring and driving a modified cage, the inner ring would rotate at 2.6 times the driving speed.
I don’t know the driving torque requirements yet but the cutter loading for engraving tools is extremely small (never stalled one yet).
This may achieve similar results to the proprietary item but without gears.
More thought is needed, but I might just build one to see the result (after I have completed all the other outstanding projects of course).
Tweakie.
Early radio sets used a ‘slo mo’ drive on the tuning knob using the differential between two circumferential tracks bridged by ball bearings.
Standard ball bearing races are designed to have a differential circumference ratio between the inner and outer tracks of around 2.6 to 1 therefore by holding the outer ring and driving a modified cage, the inner ring would rotate at 2.6 times the driving speed.
I don’t know the driving torque requirements yet but the cutter loading for engraving tools is extremely small (never stalled one yet).
This may achieve similar results to the proprietary item but without gears.
More thought is needed, but I might just build one to see the result (after I have completed all the other outstanding projects of course).
Tweakie.