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Post by DirtCleaner on Mar 31, 2015 21:50:06 GMT -5
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Post by DirtCleaner on Mar 31, 2015 21:51:35 GMT -5
Funny, the videos seemed to have morphed into their own shape as well. Will add that problem to the mix. This attempt was through Youtube, the first was direct from Photobucket.
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spiritstone
Cave Dweller 
Member since August 2014
Posts: 2,061 
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Post by spiritstone on Mar 31, 2015 22:14:12 GMT -5
That is very cool to watch in action. I noticed your grinding bits seem to have more of a circular cup shape to them and the polish pads dont. Could be your problem why it's not staying in place. Any way to reshape the polish pads?
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Post by jakesrocks on Mar 31, 2015 22:26:49 GMT -5
Exactly what spiritstone said. Your polish pads need more of a cup shape to hold the sphere. You may have to cut a thin pie shaped wedge out of each, to allow them to fit deeper into the cups.
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Post by Rockoonz on Mar 31, 2015 22:38:52 GMT -5
I have always seen rings cut from the pads and attached with velcro to PVC pipe fittings like the ones you use for grinding.
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Post by Rockoonz on Mar 31, 2015 22:44:48 GMT -5
Starting at about 30 seconds...
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Post by DirtCleaner on Mar 31, 2015 23:05:59 GMT -5
Since the Sphereheaven grinding cups worked so well I figured their polishing pads would too. They have a video up showing their pads working. What I see is much less allowable movement in the whole rig. I will try to tighten up everything some. If that doesn't work then the PVC will be tried next. For those that use the PVC ends; How do you get them to attach to your machine? Drilling and tapping a cap or are there ready made ones. I could go with 3/4" or 1" pipe or 5/8X11 threads without much trouble. |
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juzwuz
has rocks in the head
Member since April 2010
Posts: 526
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Post by juzwuz on Apr 1, 2015 14:03:08 GMT -5
I think if you can set up your machine with a lot less back-and-forth movement, it will work better. I have hard-stops on my machine that I can adjust which limits the movement. I also use diamond polishing pads and to make a slight "cup" shape, I cut 5 radial slits in the pad starting from the center and place several layers of velcro around the rim of the pad holder. Then when I stick the pad onto the holder, the radial slits allow the pad to form a slight cone shape.
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Post by Rockoonz on Apr 1, 2015 22:21:58 GMT -5
There are PVC threaded adapters in all sizes, any home improvement store will have them.
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Post by DirtCleaner on Apr 2, 2015 20:55:30 GMT -5
 Will check that out soon. Right now I am in the middle of my first year of making maple syrup. Idle hands are... |
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jerrys
spending too much on rocks
Member since February 2014
Posts: 263
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Post by jerrys on Apr 23, 2015 17:55:58 GMT -5
I use PVC cups. I shape them with a sphere and 60/90 grit for about 5 to 10 minutes. Then I use CA to attach velcro that mates with the polish pads. I cut the polish pads into rings with a sharp utility knife blade. The hole in the center and the PVC cup hold the spheres in place.
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Post by DirtCleaner on Apr 23, 2015 20:44:27 GMT -5
I use PVC cups. I shape them with a sphere and 60/90 grit for about 5 to 10 minutes. Then I use CA to attach velcro that mates with the polish pads. I cut the polish pads into rings with a sharp utility knife blade. The hole in the center and the PVC cup hold the spheres in place. CA? Cyano Acrylate? What PVC fittings do you use? The pipe reducers are $2.50 to $3 each. |
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jerrys
spending too much on rocks
Member since February 2014
Posts: 263
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Post by jerrys on Apr 24, 2015 11:59:36 GMT -5
I buy Starbond CA (Cyanoacrylate) in 16 oz bottles from www.starbond.com I use PVC reducers for the cups. I prefer PVC since they are less weight for the motor to drive. I prefer PVC fittings since I can shape the bevel to fit the sphere with using 60/90 grit in less than 10 minutes. I don't have a metal lathe to shape the metal reducers. PVC reducers are available at Lowes, Home Depot, or Ace Hardware in the plumbing or irrigation section. Agricultural or irrigation supply stores will also have them. I brazed the diamond rods on to the metal reducers that were broke in using grit for rough in. I also use SiC snagging wheels for rough in. For the marbles machines, I use sockets. I drill the square hole to fit the motor shaft. Then drill another hole and use a set screw to hold them on. Watch garage sales, estate sales, or pawn shops for the sockets. |
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jerrys
spending too much on rocks
Member since February 2014
Posts: 263
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Post by jerrys on Apr 24, 2015 12:13:42 GMT -5
If you're using metal cups, don't forget to use anti-seize on the threads.
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Apr 30, 2015 18:10:47 GMT -5
Looks to me like you sphere isn't spherical. Does your machine have machine screws behind the hinges? If so tighten them hand tight to greatly abate the wobble.
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Post by DirtCleaner on Apr 30, 2015 23:04:44 GMT -5
Each of the three hinges has a single set screw on one side. I could add one to the other side to stop the side to side motion. I have had some success with using pipe reducers to hold the diamond pads. The springs were a bit loose and I did not run the water for these few seconds. In the process of making finer grit cups.
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Apr 30, 2015 23:50:36 GMT -5
It says to "Please sign in to view this video"
Jim
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Post by DirtCleaner on May 1, 2015 18:53:27 GMT -5
It says to "Please sign in to view this video" Jim Changed the video setting to public. Should work now. If not let me know. Thanks for the heads up. |
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jerrys
spending too much on rocks
Member since February 2014
Posts: 263
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Post by jerrys on May 4, 2015 10:33:30 GMT -5
Looking good!
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Post by glennz01 on May 6, 2015 19:20:50 GMT -5
could it be partially that your not using water (by the looks) and the pads are getting hot / melting thus grabbing? I have those pads and they can do that ... also your using soft backing pads? I would think you need hard backers
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