Does anyone have a list of recommended proper speed’s for grinding, pre-polish, polish ?
Hi, Mark. I’d be interested in other responses to this. From what I’ve seen, there’s no general agreement on the subject. There’s the obvious factor that higher speed should mean faster cutting, and there is the “hydroplaning” consideration at high speeds.
I have seen specific recommendations, even by lap manufacturers, and it would be interesting to know the reasoning behind them.
I use a 1640 RPM motor with a 4 step pulley. I use the smallest step for polishing, I’m guesstimating about 250 rpm. I use the next to largest step for cutting, guesstimating 850 rpm? Somewhere in my tool pile I have an optical timing light (for measuring rpm on diesel motors), as soon as I find it I will update with accurate speeds.
Nice to see somebody’s watching !
Thank you for the information !
Still on hold for the optical timing light. Haven’t used it for several years, but it’s around here somewhere. Can’t even blame this one on the wife. She likes to move my stuff from wherever I left it to a more ideal location. She then develops amnesia when I ask where she put it.
I use speed as a complement to what I want to accomplish. Speed to me is a reason for me to do it faster, to accomplish more in less time than I want to give in time. I sweep different to to get the effect of the speed to gain efficiency in my cut to flat and meet.
would that be a photo sensor?
tucsonbear may be using the meter I have used. you would place a small piece of aluminum tape on you target. bring your target to speed. point the gage at the target, the gage will read every time the target passes the gage and will display the rpm. I do not know the brand name.
These devices are relatively inexpensive. Look for them listed as “non-contact tachometer”, “optical tachometer”, or “photo tachometer”. Amazon has a wide selection.
I have an optical tachometer. I checked the speed on my facetron. I wanted to have an idea of actual RPM, not just a mark on the dial. Mine was made in 2001. Doesn’t go as fast as the rated speed. I read in a couple different places that low speeds are best for polish. When I’m polishing the dial is usually set between 150 & 375 RPM. I usually use a Diamatrix lap for final polish.
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