sak
noticing nice landscape pebbles
Member since December 2013
Posts: 88
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Post by sak on Feb 9, 2014 13:53:18 GMT -5
Hi all,
In my quest, to source parts for my projects I've come across a large supply of flat aluminum discs. These disks range in size from 2" diameter to 16" inches diameter with Various thicknesses ranging from 1/8 inch through 3/4 inch thick. The underside of these discs have been machined with threaded nipples enabling these discs to be attached to shafts or axles.
I can get them inexpensively and I'm wondering if they would work well for possibly building a flat lap machine?
What do you guys think?
Thanks for your comments. Sak
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Post by Rockoonz on Feb 9, 2014 17:45:45 GMT -5
Male threaded or female threaded? threaded all the way through? If they are machined flat on the flat side you could use them for a lot of things. The larger ones could be bases for SiC PSA backed wet sanding paper to do larger nodules or petwood, or glue on some wool carpet with the polish of your choice. Aluminum is not suitable for grinding with grit but makes a fine base for any kind of lap disc except magnetic.
Lee #2
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rykk
spending too much on rocks
Member since September 2011
Posts: 428
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Post by rykk on Feb 9, 2014 18:32:48 GMT -5
I've seen some on Ebay - maybe yours? I was hoping to find one large enough to resurface the bottom of a 20" vibrating lap pan but they only went to 16 or 18 inches. Still, for smaller pans, they seemed ideal. Rick
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sak
noticing nice landscape pebbles
Member since December 2013
Posts: 88
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Post by sak on Feb 9, 2014 22:26:17 GMT -5
I've seen some on Ebay - maybe yours? I was hoping to find one large enough to resurface the bottom of a 20" vibrating lap pan but they only went to 16 or 18 inches. Still, for smaller pans, they seemed ideal. Rick Hi Rykk I don't have any listing on ebay right now. Regarding what I found, It's a box filled with 100's of disks (all different sizes). I could buy one or I could buy all of them. I was trying to determine potential uses for them because I know if I don't get some now I'll never see them again. If I don't get them real soon, they'll be destroyed. I found them yesterday. I'm new in this hobby and I'm in the process of building a tumbler and I'm contemplating on building a flat lap as well. What are the exact specs of what your looking for? I'm not sure if I'll be able to get back to the place in time before they're destroyed. But I can see if they got you need. Thanks Sak
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quartz
Cave Dweller
breakin' rocks in the hot sun
Member since February 2010
Posts: 3,341
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Post by quartz on Feb 9, 2014 22:30:43 GMT -5
I'd have to disagree with Lee on this, they work fine for us, 1/4" thick 6061 aluminum, 22", 140 R.P.M.. We have a disc for each grit. Most if not all of commercial vib. laps have either aluminum grinding tables or the entire pan is aluminum. Granted, they may well not last as well as cast iron, but inexpensive is good. Lee's thoughts on using them as backer discs are good too.
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sak
noticing nice landscape pebbles
Member since December 2013
Posts: 88
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Post by sak on Feb 9, 2014 23:11:14 GMT -5
Male threaded or female threaded? threaded all the way through? If they are machined flat on the flat side you could use them for a lot of things. The larger ones could be bases for SiC PSA backed wet sanding paper to do larger nodules or petwood, or glue on some wool carpet with the polish of your choice. Aluminum is not suitable for grinding with grit but makes a fine base for any kind of lap disc except magnetic. Lee #2 Hi Rockoonz, Most of what I saw had female threads. Although I did see some that were not threaded and for those I was figuring you could drill a hole and insert a setscrew. I'm not sure I understand what you mean when you say threaded all the way through. Specifically they are machined flat on one side and on the underside you see a small protruding female threaded shaft in the center. I was thinking of using them with a wet sandpaper for the purpose of grinding rocks. I'm not sure I understand what you mean when you say aluminum & grinding with grit. For the purpose of a flat lap, Can you tell me what would be the most convenient or common size disc that I should look to get? Thanks for all your input. Sak
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Post by Rockoonz on Feb 9, 2014 23:36:21 GMT -5
I'd have to disagree with Lee on this, they work fine for us, 1/4" thick 6061 aluminum, 22", 140 R.P.M.. We have a disc for each grit. Most if not all of commercial vib. laps have either aluminum grinding tables or the entire pan is aluminum. Granted, they may well not last as well as cast iron, but inexpensive is good. Lee's thoughts on using them as backer discs are good too. I assume you use 6160-T6 and have the surface shot peened. Does some of the grit embed itself in the aluminum to prevent it from wearing quickly? Both of my vibe laps have aluminum pans and they're still ok but they never see anything coarser than 600 grit and are mostly used for polishing with cerium or aluminum oxice on a piece of carpet, I use a Nelson rotary lap for the coarse grits, the laps are iron. You are right about cheap though, if I could purchase them at scrap prices I would definitely buy them. Lee
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Post by Rockoonz on Feb 10, 2014 0:14:03 GMT -5
sak The size you need is the size that works for the size of rock you want to be able to sand and polish. The most common affordable diamond laps are 6 inch or 8 inch, but they can be purchased larger. PSA sanding discs in SiC can be purchased in whatever size you need. Here's one source... Look at the 2nd down waterproof discs. www.abrasivesales.com/quickord.asp?title=PSA (adhesive backed) Discs for Glass and Lapidary&req=psadglas When I was asking about threaded all the way through I was thinking if you have 6 or 8 inch discs threaded with 1/2 inch threads they would work well as bases for the diamond laps with 1/2 inch holes in the centers. Grit lapping is basically putting the grit and water directly on the lap plate with the rocks on top, the least expensive way to do large pieces, but kind of messy. quartz has a good point about cheap, if you can get them on the cheap you may want to pick up all the largest diameter pieces you can even if you just resell them as lap plates. Even if they have a shorter life it will be money well spent. Lee #2
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sak
noticing nice landscape pebbles
Member since December 2013
Posts: 88
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Post by sak on Feb 10, 2014 0:53:43 GMT -5
@when I was asking about threaded all the way through I was thinking if you have 6 or 8 inch discs threaded with 1/2 inch threads they would work well as bases for the diamond laps with 1/2 inch holes in the centers. quartz has a good point about cheap, if you can get them on the cheap you may want to pick up all the largest diameter pieces you can even if you just resell them as lap plates. Even if they have a shorter life it will be money well spent. Lee #2 Hi Lee, Thanks for your input. Unfortunately the disks that I saw did not have any holes in the center. Is it still worth getting them even thou they don't have a hole in the center? (I wasn't thinking about the reselling opportunity but now you've peaked my curiosity) Thanks again for all your help. Sak
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Post by Rockoonz on Feb 10, 2014 1:24:52 GMT -5
If they are good and flat they have value, but I wouldn't pay a lot more than the scrap value since that seems to be what the current owner intends to do.
Lee #2
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rykk
spending too much on rocks
Member since September 2011
Posts: 428
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Post by rykk on Feb 10, 2014 2:32:16 GMT -5
Hi, Sak - The pan measures approx 19 1/4" inside diameter, so a 19" disk would work well. An 18.5" might do, as well. Maybe I could just build up the gap with metal epoxy. Rick
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Post by deb193redux on Feb 10, 2014 9:52:14 GMT -5
some discs could be floor of vib lap, some with female threads on back could be end-plate on arbor. What is the diameter and thread count. 1/2-13 is fairly common. Those alum polish heads could have decent resale value.
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sak
noticing nice landscape pebbles
Member since December 2013
Posts: 88
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Post by sak on Feb 10, 2014 13:59:11 GMT -5
some discs could be floor of vib lab, some with female threads on back could be end-plate on arbor. What is the diameter and thread count. 1/2-13 is fairly common. Those alum polish heads could have decent resale value. Hi deb193redux, I was also thinking they could be used as arbor end plates or for a flat lap. They were all different diameters & I wasn't able to measure the thread counts. I'm going to go back to that place and see if I can pick some up right now. I think these were custom fabricated. Another member (rackoonz) Suggested that I pay scrap value for them. I'm sure I'll have to pay more than that for these things. Do you know what a fair price should be? I haven't seen these online anywhere. Thanks for all your help. Sak
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sak
noticing nice landscape pebbles
Member since December 2013
Posts: 88
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Post by sak on Feb 10, 2014 13:59:24 GMT -5
some discs could be floor of vib lab, some with female threads on back could be end-plate on arbor. What is the diameter and thread count. 1/2-13 is fairly common. Those alum polish heads could have decent resale value. Hi deb193redux, I was also thinking they could be used as arbor end plates or for a flat lap. They were all different diameters & I wasn't able to measure the thread counts. I'm going to go back to that place and see if I can pick some up right now. I think these were custom fabricated. Another member (rackoonz) Suggested that I pay scrap value for them. I'm sure I'll have to pay more than that for these things. Do you know what a fair price should be? I haven't seen these online anywhere. Thanks for all your help. Sak
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Post by deb193redux on Feb 10, 2014 15:45:54 GMT -5
www.kingsleynorth.com/skshop/product.php?id=97359&catID=1055www.lortone.com/drums.html8" diameter - $ 72.50 1/2"-20, Straight Bore, 8" Dia. #515-021 3/4"-16, Right Hand, 8" Dia. #515-028 3/4"-16, Left Hand, 8" Dia. #515-029 3/4"-16, Straight Bore, 8" Dia. #515-027 Looks like if is 1/2-20 not 13. Also 3/6-16. Good point is LH or RH threads. as that will determine which end of arbor it can go on. If used as a base-plate for horizontal lap, LH/RH would make less difference if motor was reversible. Unless there were ribs for strength (like the cast ones for sale) I am not sure larger then 6" would be advisable. I bought some male threaded ones used at a show for about $15.
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sak
noticing nice landscape pebbles
Member since December 2013
Posts: 88
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Post by sak on Feb 10, 2014 19:22:06 GMT -5
www.kingsleynorth.com/skshop/product.php?id=97359&catID=1055www.lortone.com/drums.html8" diameter - $ 72.50 1/2"-20, Straight Bore, 8" Dia. #515-021 3/4"-16, Right Hand, 8" Dia. #515-028 3/4"-16, Left Hand, 8" Dia. #515-029 3/4"-16, Straight Bore, 8" Dia. #515-027 Looks like if is 1/2-20 not 13. Also 3/6-16. Good point is LH or RH threads. as that will determine which end of arbor it can go on. If used as a base-plate for horizontal lap, LH/RH would make less difference if motor was reversible. Unless there were ribs for strength (like the cast ones for sale) I am not sure larger then 6" would be advisable. I bought some male threaded ones used at a show for about $15. Hi deb193redux, Thanks so much. You nailed it. The stuff you found on Kingsley/lortone is pretty much exactly what I had found. The only difference is that the stuff I saw doesn't have any rubber attached to it. At least now I know what it is. Unfortunately I went to the place but they closed early today so I couldn't get anything. Hopefully it will still be there tomorrow. Thanks for all your help. Sak.
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sak
noticing nice landscape pebbles
Member since December 2013
Posts: 88
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Post by sak on Feb 11, 2014 17:22:08 GMT -5
Hi, Sak - The pan measures approx 19 1/4" inside diameter, so a 19" disk would work well. An 18.5" might do, as well. Maybe I could just build up the gap with metal epoxy. Rick Hi Rykk, I went to the place that has the aluminum discs. I found one that's approx 1 1/8" thick with an approx diameter of around 17 1/2". On the underside it's got what looks like a non treaded pipe attached to it (all aluminum 1 piece). I was able to take some pics but I'm not sure how to attach them here. The shop owner is asking $2/ pound for this disk. (Btw. It's heavy. I would expect it to be at least 35-30 lbs). I don't know what the ebay disks cost but if this is a good deal for you & your willing to pay for shipping I can get it for you. Thanks Sak
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rykk
spending too much on rocks
Member since September 2011
Posts: 428
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Post by rykk on Feb 11, 2014 19:34:24 GMT -5
Thanks, for looking, Sak. 1/8" is too thick, however. The pan, itself, is only approx. 2" deep and such a thick disk would cause splashing of grit out of the pan and, possibly, the rocks might escape as well. I was thinking of something more like 1/2". The diameter would be workable, though. Rick
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sak
noticing nice landscape pebbles
Member since December 2013
Posts: 88
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Post by sak on Feb 11, 2014 21:32:36 GMT -5
Thanks, for looking, Sak. 1/8" is too thick, however. The pan, itself, is only approx. 2" deep and such a thick disk would cause splashing of grit out of the pan and, possibly, the rocks might escape as well. I was thinking of something more like 1/2". The diameter would be workable, though. Rick Hi Rykk - On one hand, I'm sorry I couldn't help you out, but on the other I'm thrilled that I don't have to lug that thing around. I'm telling you, that thing was seriously heavy. I picked up (2) 8" disks for $12 for myself today & they where probably 1" thick as well. Since I'm thinking about a DIY flat lap the thickness shouldn't be a problem for me. My problem is that I haven't finished my tumbler build yet, (still need parts), but I ran across these disks, & that if I didn't get these now, I 'd probably never see them again at this price. Sak.
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rykk
spending too much on rocks
Member since September 2011
Posts: 428
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Post by rykk on Feb 13, 2014 4:34:59 GMT -5
Yeah, at that thickness I'll bet they were really heavy! I was thinking of a disk to resurface the bottom of a lap pan that is probably only 1/8" thick after a LOT of use and also for another that I have that is dished in the center. Rick
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