Deleted
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Member since January 1970
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Post by Deleted on Oct 6, 2016 17:23:35 GMT -5
James, Google "pottery wheel". Images there may turn on a light bulb. Pottery wheel on steroids! Or meth in some cases... Never thought about a pottery wheel. You do need speed, say 800-3000 RPM for 12-14 inch pad. For fast cut anyway. I got that 200 grit pad in the mail yesterday. It is totally different from the rubber pads. Stays wet forever. Put a glass slab on it wet and rubbed it. Instant frosted glass. Because it is spongy it cuts more on the edges making a very slight cab effect. May make interesting polished faces with an old TV screen curvature. Pad rated for 10,000 sq ft of concrete. LOTS of slabs. Spongy also means it can confirm and assist undercutting of soft materials. The beauty of hard matrix cutting is they don't tend to undercut on materials with softer components. Like your conglomerate or sagenite...
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wampidytoo
has rocks in the head
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Post by wampidytoo on Oct 6, 2016 18:03:07 GMT -5
If you are happy with the trade off it looks like you have a winner. Are you going to buy a full set? Jim
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wampidytoo
has rocks in the head
Add 5016 to my post count.
Member since June 2013
Posts: 709
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Post by wampidytoo on Oct 6, 2016 18:16:41 GMT -5
James, Google "pottery wheel". Images there may turn on a light bulb. Pottery wheel on steroids! Or meth in some cases... Pun intended or just being a dick again bobby? Just can't give it up can you. Reminds me of the little man complex. Or you got bullied and picked on when you were a child and you are trying to make up for it now in a way that prevents you from getting beat up. In all honesty, I feel sorry for you. Jim
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jamesp
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Post by jamesp on Oct 6, 2016 19:11:20 GMT -5
Never thought about a pottery wheel. You do need speed, say 800-3000 RPM for 12-14 inch pad. For fast cut anyway. I got that 200 grit pad in the mail yesterday. It is totally different from the rubber pads. Stays wet forever. Put a glass slab on it wet and rubbed it. Instant frosted glass. Because it is spongy it cuts more on the edges making a very slight cab effect. May make interesting polished faces with an old TV screen curvature. Pad rated for 10,000 sq ft of concrete. LOTS of slabs. Spongy also means it can confirm and assist undercutting of soft materials. The beauty of hard matrix cutting is they don't tend to undercut on materials with softer components. Like your conglomerate or sagenite... I see your point. But a convex slab of hard stone well polished would have appeal. The 4 inch diamond pads tend to do that if I had to remove saw marks with the 100 and 200 pad. Because it took a while and was difficult to hold a 5-15 pound half flat against the little pad. I will take some photos of this freaky pad. I find it intriguing.
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Post by tims on Oct 6, 2016 22:19:54 GMT -5
Curious to see a pic of freaky sponge pad.
On a related note i've got a 10" diamond resin disk coming, it's a solid surface disk not segmented. If it's messy i may not get to use it for awhile as it's getting chilly here already.
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Post by captbob on Oct 6, 2016 22:39:21 GMT -5
James, Google "pottery wheel". Images there may turn on a light bulb. Pottery wheel on steroids! Or meth in some cases... Pun intended or just being a dick again bobby? Just can't give it up can you. Reminds me of the little man complex. Or you got bullied and picked on when you were a child and you are trying to make up for it now in a way that prevents you from getting beat up. In all honesty, I feel sorry for you. Jim Actually, it's more an innuendo than than a pun, but take it as you wish. I wouldn't expect you to know the difference. And yes indeed, it was intended. As for the rest of your quackery, that's all it is. Quackery - full of sound and fury signifying nothing. Save it for those feeble of mind enough to be misled by your sophomoric drivel. Gotta give you credit for being amusing though, so I thank you for that. I shall be on the edge of my seat awaiting your next diatribe of baseless suppositions.
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jamesp
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Member since October 2012
Posts: 36,561
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Post by jamesp on Oct 7, 2016 2:52:21 GMT -5
Curious to see a pic of freaky sponge pad. On a related note i've got a 10" diamond resin disk coming, it's a solid surface disk not segmented. If it's messy i may not get to use it for awhile as it's getting chilly here already. Solid ? Got a link ? Resin ? What is the center hole size tims ? This pad is 7/8 inch thick Has a 1 inch hole in the center. Makes for an easy vertical shaft mount. Say a large sprocket from the junkyard with a 1 inch bore for a true turning lapper plate. 4 pins welded or bolt ends sticking up 1/4" to interlock it to the plate. Drill the pad, 4 little holes would not effect it's operation. Have the 1 inch shaft stick up to drop the pad on for centering. Pads could be dropped on and lifted off rapidly. Here is a link. I bought 200 grit 13" pad. 200-400-800-1500-3000 is the available grits www.diamondtoolstore.com/index.php?main_page=product_info&cPath=114_11&products_id=1500
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jamesp
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Post by jamesp on Oct 7, 2016 3:05:01 GMT -5
Looking at a 16 inch tank head with legs tall enough to have a vertical shaft running up the center. 16 inch tank head for 13 inch pad or 18 inch tank head for 17 inch pad. Probably go with 18 inch, that way a 13 or 17 inch pad could be used. Motor mount and shaft bearings mounted on 2 vertical plates welded to bottom of bowl. Those bowls are rigid. Vertical plates can be welded directly to the bottom. Spin pad at 800 RPM, conservative. Even slower. 3600 rpm on 4 inch pad = edge speed 3730 feet/minute--or-- 800 rpm on 13 inch pad = edge speed 2721 feet/miniute, 17" 3558/minute. At 13 to 17 inch diameter 400 rpm would do some fast work. Slab hand held. A 5 pound or heavier rock sawn in half to be face polished may have to be hand held so as not to crush pad. Manage the water with a slinger on vertical shaft just below bowl and baffle to manage it. A partial cover over top to keep mist under control. Lapper plate may have to be made in a machine shop. However, a 1 inch bore sprocket can serve as a mounting surface for a polycarbonate(or similar material) 17 inch disc. Something like this 24 inch tank head fire pit:
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jamesp
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Post by jamesp on Oct 7, 2016 5:51:25 GMT -5
Fooling around with this 13 inch 200 grit diamond pad. Pencil would not penetrate under a lot of force. This is a tough durable pad. Pad similar to a fast draining sponge when pulled out of water. Stays wet though. This blob of water left a wet spot. Once wet, stayed wet. Took some rubbing to work water into pad. Polished quartz tumble Not so polished quartz tumble after 60 seconds rubbing at medium pressure Close in, grinding face Edge view, diamonds sparkling. The pad must wear in use as the diamonds are full depth. Interesting Useless for doing flat slabs. Due the way it deforms in the center of contact and does not hit the abrasive. Note center is not abraded. The rubber pads do not have this problem. They are the opposite; they are hard and not friendly with curved surfaces. Just flat. However these pads may be coup de gras for cabs, tumbles and soft arcs. Think el cheapo expando wheel.(I think expando wheels conform to curved surfaces ??) I could see shaping a cab on a single coarse 80/100 grit cab wheel and all finish done in a jiffy with these pads 200-400-800-1500-3000 quick change lapper style. One lift off/drop on pad lapper plate, six $23 thirteen inch pads, presto. 5 finish step cab finishing machine with one rotating lap face. Me no cab person, just thinking out loud. If these pads are designed for 10,000 sq ft of granite/concrete floor that must equal like 1 million cabs. Check large deformation: Return from deformation after 60 seconds. A temporary shape could be retained radially as the pad rotated to assist abrading a curved surface like a cab.
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Post by tims on Oct 7, 2016 22:19:27 GMT -5
Solid ? Got a link ? Resin ? What is the center hole size tims ? This is from Eastwind Diamond Abrasives.They make resin bond disks up to 24", and will do an arbor hole from 1/2" to 1.5", or no hole, and are available with adhesive, velcro, or magnetic backing. Just got mine tonight and the disk is surprisingly thin ... maybe 1mm thick? There wasn't any info listed on the thickness and i'd assumed they'd be similar to the smaller segmented disks, but no such luck. Hopefully it will hold up. I got the 60 mesh for smoothing slabs. I couldn't find a 10" disk with 1/2" hole anywhere so ordered custom from these guys, and it was expensive ... $120 or so with the magnetic backing (around $8) and shipping, so not a great budget option ...
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jamesp
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Post by jamesp on Oct 8, 2016 2:11:57 GMT -5
Solid ? Got a link ? Resin ? What is the center hole size tims ? This is from Eastwind Diamond Abrasives.They make resin bond disks up to 24", and will do an arbor hole from 1/2" to 1.5", or no hole, and are available with adhesive, velcro, or magnetic backing. Just got mine tonight and the disk is surprisingly thin ... maybe 1mm thick? There wasn't any info listed on the thickness and i'd assumed they'd be similar to the smaller segmented disks, but no such luck. Hopefully it will hold up. I got the 60 mesh for smoothing slabs. I couldn't find a 10" disk with 1/2" hole anywhere so ordered custom from these guys, and it was expensive ... $120 or so with the magnetic backing (around $8) and shipping, so not a great budget option ... More diamond products. All kinds coming out of the wood work. Would have been nice if these products were available during they heyday of lapidary popularity. When so much research and development was invested. Diamond products are evolving rapidly, price dropping and mass production methods on the rise. Please share your findings with this product.
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Post by spiceman on Oct 9, 2016 21:06:06 GMT -5
Went to the local store that buys stuff from other stores going under. Picked up some diamond pads 200, 400.. 4" but only 2 bucks apiece. Bought all they had 15 pcs. They are Called stone medic the website sells them for 47 bucks apiece. Good for marble and granite. Happy with the buy. :) Have to go back and look for a wide range of grit.
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Post by tims on Oct 10, 2016 20:34:54 GMT -5
Tried out the 10" disk from Eastwind today and it works well with flat slabs. It doesn't cut down material as quickly as i'd hoped, but i'm running it slow in order to keep it wet with just a drip cup. The magnetic backing holds well to the 10" cast-iron plate that came with my Gem Maker. I think it would work for some basic shaping, but the disk is so thin i'm afraid of hitting it with edges that might cause a tear.
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