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Post by Bluesky78987 on Sept 21, 2012 0:01:01 GMT -5
Patience, riiight, forgot about that! ;-)
Agreed Diana, chipping does increase with larger diamond particles. More so with some materials than others.
Rockncritter, yeah, the 60 was sort of a humorous hypothetical; nothing soft would ever need to touch it.
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Post by Rockoonz on Sept 21, 2012 0:57:25 GMT -5
If the grit on the wheel and the lap are the same my 2nd guess would be horsepower, actually torque to be specific. A genie is only 1/4 HP but is still a lot more than the Ameritool flat lap, even at full tilt it doesn't take much force to slow the motor down. I use an older Covington Belt drive flat lap with a 1/3 HP motor and there's no way I can slow it down. It cuts fast.
Lee
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Post by johnjsgems on Sept 21, 2012 7:47:59 GMT -5
Lee, you might be right. A lot of the universal motors are "1/4 hp equivalent" rather than 1/4hp. The Genie motor is an industrial Baldor made to Diamond Pacific's specifications (OEM).
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Post by johnjsgems on Sept 21, 2012 8:05:22 GMT -5
A related issue could be how much pressure is used. I sell a lot of Ameritool units but have never used one. I have used my Dremel a lot and can talk about a low torque motor. The more pressure the slower the motor turns and not very much pressure is needed to stall the motor completely. So, I'm guessing, the Ameritool would grind faster using a light pressure and let the diamonds do the work.
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LarryS
freely admits to licking rocks
SoCal desert rats
Member since August 2010
Posts: 781
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Post by LarryS on Sept 21, 2012 20:44:45 GMT -5
When I first used the 80 disc on my Ameritool, it was chipping hard jasp-ag. Solution? Turned the speed down to 1/2 or less and use light pressure. Works fantastic and can shape the cabs in the fraction of time. I jump from 80 to 180 and never even use the 100 anymore. Zero scratches.
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slabbercabber
starting to shine!
Member since March 2010
Posts: 30
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Post by slabbercabber on Oct 23, 2012 19:25:55 GMT -5
Look at it this way. there is only one optimum sfm. If the drum style is set up to that speed then it will grind at optimum aggressiveness. A disk on the other hand has optimum sfm at only one point on it's radius. Since you cannot use that point exclusively, you must keep moving away either faster or slower across that spot. The further you get from that perfect point the slower your grinding will be.
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