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I Realize That The Motor I Am Using Will Not Provide Much Torque, Especially If I Try To Slow It Down. However, All My Turning Is Done With A Trim Router Spinning A 6 Flute 2" Diameter Slot Cutter At 30,000 Rpm. There Is Virtually No Load To The Spindle Drive Motor At All. In Fact Many Of My Operations I Don't Even Turn It Off To Change Parts, I Use The Spring Loaded Live Center From Taig, And All My Parts Are Turned On Centers.
Torque Is Not The Problem, Vibration Is. When You Turn Small Diameter Long Wood Items Like A Cue Shaft, Speed Will Make Any Vibration Worse. I Currently Spin The Parts At About 200rpm Using The Slowest Speed On The Motor And Step Down Pulleys, But Would Like To Be Down To Around 120rpm.
The Ability To Change The Spindle Speeds Would Allow Me To Experiment To See Which Speed Gave The Least Chatter In The Work Peice. If I Just Machined A New Pulley To Slow It Down Some, I Wouldn't Know If That Was The Right Speed Until I Tried It. That Could Lead To Machining Quite A Few Pulleys.
Driving The Spindle With A Stepper Motor Controlled By The Cnc Only Makes Sense. I Could Experiment With Speeds Very Easily And Home In On The Right Speed For Each Component.
If I Had Easy Access To A Small Dc Motor And Speed Control That Would Also Work, But The Repeatability Would Be A Judgement Thing. You Know, A "I Think I Set Right There Last Time" Kind Of Thing. The Stepper Would Be Easy Set To An Exact Rpm Each Time.
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