meta7
starting to spend too much on rocks
Member since June 2010
Posts: 164
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Post by meta7 on Jun 25, 2011 10:46:45 GMT -5
Does anyone have info (or preferably a chart) about what speeds various diameter rotating flat laps should be run at?
My motor is the standard 1725 rpm. And I will be using diamond disks, so there is no need to slow down so as to keep the Silicon Carbide on the plate, because it will be all diamond hard and soft discs and no SC.
Specifically, I would like to know for 10" diameter, 12", 16" and 18" diameter discs.
My flat lap will be horizontal (flat surface is parralel to the ground)
Can an 18" diamond disc be run at 1725 rpm?
Thanks, Dave
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Post by Jack, lapidaryrough on Jun 25, 2011 12:06:03 GMT -5
grindglass.com/ The link above has some RPM speeds for diamond disk. I have a SC - 18" Rotary cast iron, RPM 178. I`m thinking about the DP - magnetic disk for it. Though i`l need to speed it up. myself i well run RPM on it at 500 - 600. I have a 24" lamb wool rotary polish lap, RPM 265. high the diameter the slower. did a google search, could not find a chart for speed. Call Some of the builders of large flat lap. Diamond Pacific, Kingsley North. The link i shared, Diamond Pacific dos make a rotary 18" Though i could`t find RPM on the unit. Good Luck Jack
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Post by Jack, lapidaryrough on Jun 26, 2011 9:55:45 GMT -5
Meta7
i`d run the disk same speed as the diamond blades. SFPM this should get you in the wright ball park.
MK-Diamond has some tech help on staff, and a chart for blade speeds. on their site - diamond pacific.com
thinking the cutting, Would be same as a saw blade cutting stones. i know your working all the Radius, check the cutting action,
And use lots of water.
Jack
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rallyrocks
fully equipped rock polisher
Member since November 2005
Posts: 1,507
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Post by rallyrocks on Jul 22, 2011 18:10:39 GMT -5
Many horizontal laps have variable speed motors and let you set it as you'd like-
one thing to keep in mind, the speeds of rotation for wheels and saws on an arbor generally deliver a fixed linear speed at the point of contact for the abrasive, which is very different from the situation on a flat lap where the distance from the center also has a direct effect on the effective linear speed at the point of contact.
So for example- if you are working closer to the center of the lap (where the abrasive is moving around a small circle of say 4-8 inches distance per rotation) you would need a higher RPM to get the same cutting effect you would get working closer to the edge (where the abrasive might be moving 20-30 inches each time around).
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rockhound97058
freely admits to licking rocks
Thundereggs - Oregons Official State Rock!
Member since January 2006
Posts: 760
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Post by rockhound97058 on Jul 23, 2011 23:17:40 GMT -5
Some time ago I built a 24" Flat Lap for a buddy of mine - and I've also built a couple smaller 18" for other people and one for myself. The machines I put out spin the plate at roughly 55 RPM which is just about perfect. Too fast and the grit flies off too quick, and too slow and the grit will remain in the center and not spread out across the plate. I keep thinking about buying those diamond laps, but hate to spend the money for a trial and error type deal. If you planned on trying to spin your flap lap at 1725, especially with a 18" plate - You'd have to make dang sure it was machined very close - or else that thing would shake apart at those speeds. Here's an Oregon dealer who build laps - Might be someone to contact as well. www.ultimategrinder.com/Flat_Laps.htmlMy next deal I plan to build is a high-speed sander. The one I plan to build is going to be 12" diameter and spin between 2 and 3000 RPM and use PSA backed silicon carbide discs. It's the same principle as the machine's on the above website, however I don't need the expando drum. Jason
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rockitman
freely admits to licking rocks
Member since September 2007
Posts: 771
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Post by rockitman on Aug 25, 2011 1:04:41 GMT -5
Ya might think about it this way meta. If you turn an 18"disc at 1725 RPM. Get ready to duck and run. The outside edge of the disc will be traveling at......you ready?...... over 92 miles per hour! You talk about slingin rocks. Ye Ha.
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