Roger
fully equipped rock polisher
Member since January 2013
Posts: 1,487
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Post by Roger on Feb 26, 2013 22:44:01 GMT -5
Hi all I purchased a used Rock Rascal for a steal of a price. However, all it came with is one well used saw blade and one broken 100grit grinding wheel. I have been on the manufacturers website trying to figure out what grinding/polishing equipment I should have and which will fit/work with this thing. I admit that I have no clue and the website is not much help. Daniel pointed me to the 303c diamond blade - but I have no idea what else will I need and which will work. Can anyone please give a list of accessories for this thing? Thank you VERY much! Roger
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Post by deb193redux on Feb 26, 2013 22:54:13 GMT -5
get a diamond wheel from jadecarver or other vendor. maybe 120g.
i think it can also take an endplate. is the arbor end tapped?
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Roger
fully equipped rock polisher
Member since January 2013
Posts: 1,487
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Post by Roger on Feb 26, 2013 23:57:55 GMT -5
i am not sure. will take a look tomorrow.
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Roger
fully equipped rock polisher
Member since January 2013
Posts: 1,487
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Post by Roger on Feb 28, 2013 23:05:56 GMT -5
the arbor is not tapped. any idea what depth, diameter and thread it would need to be? i am not afraid to try and tap it.
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QuailRiver
fully equipped rock polisher
Member since May 2008
Posts: 1,640
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Post by QuailRiver on Mar 1, 2013 1:32:56 GMT -5
I assume you are referring to the Rock Rascal model T? If it has the original arbor it should be threaded on both ends. If I remember correctly the rock rascal arbor is 1/2" 20tpi. If you are planning to use a Rock Rascal model T for roughing cabs to finish in a tumbler then all you need is a good trim saw blade and a coarse grinding diamond wheel. Any thing from an 80 grit to 180 would work fine. Preforming the cabs with an 80 grit wheel would be faster than with a 180 grit wheel but the preforms would require a longer period of time in the tumbler to remove the 80 grit scratches. If you plan to use the Model T to cut cabs from start to finish by changing wheels between steps, then I would recommend at a minimum; a 180 grit diamond grinding wheel for preforming, a 360 grit wheel for final shaping, 600 and 1200 grit Nova or soft-flex wheels for sanding and pre-polishing, and then a padded cast aluminum spin-on disc with a felt or leather pad and some cerium oxide for polishing.
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Roger
fully equipped rock polisher
Member since January 2013
Posts: 1,487
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Post by Roger on Mar 1, 2013 9:08:44 GMT -5
It is the Model T and threaded both ends. I had in my head that the tap in question was one which woud allow something to be screwed INTO the rod - next to the grinding wheel which is ON the rod?
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Post by jakesrocks on Mar 1, 2013 9:34:40 GMT -5
If you want to tap the wheel end of your arbor, It would be best to have it done in a lathe. It will need to be drilled and tapped 1/4 X 20 TPI, and about 3/4" deep. If you try drilling and tapping yourself without a lathe, There's a good chance that the hole will be off center. This will cause a vibration which will quickly wipe out the arbor bearings.
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Post by Rockoonz on Mar 1, 2013 11:07:38 GMT -5
a 1/2" arbor is way too small to be drilling into the end even if you can put it on a lathe. RPM is way too fast for a polisher on the end anyway. Model T would be good to cut preforms for cabs to finish in a vibe tumbler, a big PITA to use to make cabs by hand.
Lee
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QuailRiver
fully equipped rock polisher
Member since May 2008
Posts: 1,640
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Post by QuailRiver on Mar 1, 2013 12:58:13 GMT -5
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Post by deb193redux on Mar 1, 2013 14:54:13 GMT -5
yes. quailriver is correct. I only asked because I did not know what kind of end the arbor had. Not worth trying to tap when it is threaded.
I think you would have to take the wheel off to use an endplate, but I am not clear on this either.
all of this is moot if you tumble finish. but I noticed that the RockRascal package at theRockShed has an end plate, some sanding discs, and a leather pad.
if you want this ability to finish outside of the tumbler, you might ask Shawn at the rockshed for details about the end plate and how the discs/pads are attached. I assume feathering cement.
anywhere, there are various plates available or threaded 1/2" arbors. just make sure you get right-hand threaded.
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Roger
fully equipped rock polisher
Member since January 2013
Posts: 1,487
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Post by Roger on Mar 1, 2013 18:20:45 GMT -5
i emailed shawn a week ago asking those questions. i also emailed johnson brothers at the samw time. no replies from either.
i think quails link is what i need. it looks right. appreciate all the input everyone, thank you!
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