I have a 1958 Craftsman lathe that I converted to variable speed with a DC motor. Wanting to know it's speed range, I decided to go old school with a disc tachometer. I used discs calibrated for 60hz and they work fine with shop fluorescents. See the video for more details. Included below is a disc pattern I made and is free to use. The youtube video page has a link to the full size graphic.
The knocking sound was a loose set screw.
Last edited by wormil; Oct 4, 2013 at 11:01 PM.
chevysman21 (Feb 27, 2016), DIYer (Oct 7, 2013), kbalch (Oct 6, 2013), rdhem2 (Oct 8, 2013)
Thanks wormil! I've added your Strobe Disc Tachometer to our Measuring and Marking category, as well as to your builder page: wormil's Homemade Tools. Your receipt:
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