Tom
fully equipped rock polisher
My dad Tom suddenly passed away yesterday, Just wanted his "rock" family to know.
Member since January 2013
Posts: 1,557
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Post by Tom on Nov 17, 2013 12:24:12 GMT -5
Hi everyone, This is a problem (maybe) with a 280 grit new from Cab King wheel. I did not know where to actually post this because this is for saws. We need a sub forum for equipment problems in general??? Or am I missing the proper forum? Anyway, I can't seem to get the scratches out from the 220 hard wheel as easy and fast bas it once was. It seems to work great on the edges but the center of the cab takes a long time. Maybe I am not spending enough time on the 220 wheel. But have a look at this, from what I have been told they really should not wear out till you start to see the rubber backing. But this is a factory Cab King and not a nova wheel. I am pretty much certain that the wheel is not contaminated because it works great on the edges/smaller surface areas. Thanks,
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Post by phil on Nov 18, 2013 20:52:36 GMT -5
Show us the profile of your cab. I think you are trying to polish a flat center??? make sure you have a domed shape, however slightly, or you'll have exactly the problem you're stating.
As to which forum? you'd probably have been better off had you posted it in the Creating Cabochons board.
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Tom
fully equipped rock polisher
My dad Tom suddenly passed away yesterday, Just wanted his "rock" family to know.
Member since January 2013
Posts: 1,557
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Post by Tom on Nov 22, 2013 8:20:49 GMT -5
Thanks Phil,
You are correct in that some of my larger cabs would not have a perfect dome, I never thought of that but now that you mention it, its the likely culprit:) Never have a problem on smaller cabs. I will have to work harder at getting a dome on those larger cabs. I think you hit the nail on the head.
Next question I have like this I will post appropriately.
Thanks again
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Post by phil on Nov 22, 2013 12:37:25 GMT -5
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The Dad_Ohs
fully equipped rock polisher
Take me to your Labradorite!!
Member since September 2012
Posts: 1,860
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Post by The Dad_Ohs on Nov 22, 2013 14:51:45 GMT -5
Another possible issue is a corrupted 280 wheel.... if you are using a pusher to spray water up onto the wheel and the same water is used for the coarser grits then you probably have grit contamination on your 280 wheel.
Take and old toothbrush you don't use anymore or buy one and keep it just for this. use a cup of water or clean water in the tray of your cabbing machine. dip the toothbrush into the clean water and run the bristles against the wheel while it is turning. does this to clean the wheel thoroughly and then redo the stone on the 280 wheel and the scratches should come out!! whwn ever you switch from the 220 to the 280, even though they are on the same side, you should empty and clean the water tray on your machine to prevent this contamination from occurring again. also I would recommend cleaning all the wheels on your machine like this as the grit issue can affect all the sanding/polishing wheels from 280 all the way up to 14000 or higher depending on what you have on your machine. I use a machine at my club and clean the wheels before I use the machine and after I am done... only take 2-3 minutes to do the whole thing, and it save grief later on!!
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Tom
fully equipped rock polisher
My dad Tom suddenly passed away yesterday, Just wanted his "rock" family to know.
Member since January 2013
Posts: 1,557
|
Post by Tom on Nov 22, 2013 18:42:52 GMT -5
I don't think its contaminated but it would only take a minute to clean. This is on a Cab King machine so there is always a fresh clean water supply to the wheels. I will clean it just because its a good idea, thanks!!
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The Dad_Ohs
fully equipped rock polisher
Take me to your Labradorite!!
Member since September 2012
Posts: 1,860
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Post by The Dad_Ohs on Nov 23, 2013 12:00:33 GMT -5
I don't think its contaminated but it would only take a minute to clean. This is on a Cab King machine so there is always a fresh clean water supply to the wheels. I will clean it just because its a good idea, thanks!! ah, ok, well if there is always clean water on the wheel, cleaning won't hurt it, but after saying that, you may need to check the curve of your dome.... My teacher used to rub an aluminum gutter nail over the top of the stone and then would work it the next grit until all the scratched came out, this way he was able to check the dome to make sure there were no low spot in it.... sounds like you have a similar problem... a low pot on your dome.
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Post by johnjsgems on Nov 23, 2013 13:19:08 GMT -5
Another source of contamination could be moving the stone from wheel to wheel without cleaning. You should at least wipe the stone between wheels.
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gemfeller
Cave Dweller
Member since June 2011
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Post by gemfeller on Nov 23, 2013 13:31:56 GMT -5
Another possibility, assuming a flat spot isn't the culprit: failure to remove all the 80-grit scratches with the 220. It's easy to make that mistake if you don't dry the cab and inspect it with a loupe at each wheel stage. Rick
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Tom
fully equipped rock polisher
My dad Tom suddenly passed away yesterday, Just wanted his "rock" family to know.
Member since January 2013
Posts: 1,557
|
Post by Tom on Nov 23, 2013 18:41:53 GMT -5
Thanks everyone, I think it may be a combination of everything you say. At least no one said the wheel was worn out:)
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Post by phil on Nov 23, 2013 21:52:05 GMT -5
Nope. Wheel definately not worn out. Worn a little sure which means slower, but not worn out.
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