hound593
off to a rocking start
Member since April 2016
Posts: 8 
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Post by hound593 on Jun 27, 2016 21:11:22 GMT -5
i know this has been asked before, but i can never find the info when i need it. i am making a 12" flat lap and need to know the rpm to use. should i say the sfm as that would be more usefull. i plan on using both diamond laps and loose grit. any info would be most helpfull.
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Post by roy on Jun 28, 2016 10:58:26 GMT -5
if your going to use both diamond and loose grit i would suggest a speed control cause diamond pads need to turn much faster than loose grit
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hound593
off to a rocking start
Member since April 2016
Posts: 8
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Post by hound593 on Jun 28, 2016 13:03:51 GMT -5
variable speed dc motors are expensive, that is way i am using an ac moter with step pulleys. so i need the rpms for both so when i make my pulley i can hit both ranges.
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Post by johnjsgems on Jun 28, 2016 13:58:49 GMT -5
I think the old loose grit laps ran 600 or less. Otherwise it is a grit slinger. Once you try diamond you won't like the grit. Are you using magnetic backed diamond discs?
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hound593
off to a rocking start
Member since April 2016
Posts: 8
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Post by hound593 on Jun 28, 2016 21:10:15 GMT -5
no, the dia. lap has a 1/2" arbor hole. also, plan on using sc disc.
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Post by Rockoonz on Jun 28, 2016 22:32:28 GMT -5
My 18 inch nelson grit dropper lap runs 145rpm, 683FPM at the edge, which works nicely.
215ish RPM will net you the same surface speed at the edge, don't know what it will do with the slurry though.
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