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Post by Jugglerguy on Sept 23, 2018 18:09:13 GMT -5
I picked this rock up several year ago, and then decided that I don't like granite. I took it to my in-law's cottage to dump it, and my mother in law has had it on the deck ever since. This summer she asked me if I'd polish it for her. I started it in a 12 lb. Lortone barrel, and then finished it with my Makita wet grinder. It turned out pretty good, but it was originally more yellow. The yellow was some sort of surface staining or oxidation, I guess. This rock is almost spherical, which made it difficult to keep track of where I had ground on it an where I hadn't.  |
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Post by fernwood on Sept 23, 2018 18:12:36 GMT -5
Nice granite.
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Post by Drummond Island Rocks on Sept 23, 2018 20:38:50 GMT -5
Looks good. Do you hold the stone in your hand while using the Makita grinder or do you clamp it down? I am so used to holding and moving a stone against a wheel that it would be awkward to move a wheel around a stationary stone. I still need to try mine out but another summer has past and that is not a fall and winter activity.
Chuck
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Post by Jugglerguy on Sept 24, 2018 5:26:46 GMT -5
I have two 2x4s screwed to the piece of plywood I work on. Most rocks can be pushed up against one of them or nestled in between them. This one was pretty small, so I screwed two more small pieces of 2x4 next to one of the longer ones to make a triangle. That mostly worked to hold it, but it rolled out several times. I can’t clamp it too well because I have to keep rotating it. I tried holding it in my hand and the grinder in the other hand, but that was an accident waiting to happen.
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Post by Drummond Island Rocks on Sept 24, 2018 6:38:36 GMT -5
I have two 2x4s screwed to the piece of plywood I work on. Most rocks can be pushed up against one of them or nestled in between them. This one was pretty small, so I screwed two more small pieces of 2x4 next to one of the longer ones to make a triangle. That mostly worked to hold it, but it rolled out several times. I can’t clamp it too well because I have to keep rotating it. I tried holding it in my hand and the grinder in the other hand, but that was an accident waiting to happen. I was wondering if the grinder could be mounted so that the pad was horizontal and pointed down. Like a Richardson rock sander. That way you hold the rock and push it up to the wheel.  Chuck |
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Post by Jugglerguy on Sept 24, 2018 9:27:06 GMT -5
I have two 2x4s screwed to the piece of plywood I work on. Most rocks can be pushed up against one of them or nestled in between them. This one was pretty small, so I screwed two more small pieces of 2x4 next to one of the longer ones to make a triangle. That mostly worked to hold it, but it rolled out several times. I can’t clamp it too well because I have to keep rotating it. I tried holding it in my hand and the grinder in the other hand, but that was an accident waiting to happen. I was wondering if the grinder could be mounted so that the pad was horizontal and pointed down. Like a Richardson rock sander. That way you hold the rock and push it up to the wheel. Chuck I suppose it could be. A long time ago, I made a thing to hold my regular, dry grinder so I could shape tumbling sized rocks on it like jamesp does. James has his set up with some safety measures, but mine was a completely exposed cup grinder. It moves at something iike 10,000 rpms and has a jagged surface that would rip skin off. The thing scared me, so I only used it a couple times. I like the idea of using a slower grinder with water (like my Makita) for this purpose. I also like pushing up to the blade as a bit of a safety mechanism, but it would make it more difficult to see what you're doing. Honestly, I usually do much larger rocks, which don't roll around so much, so I don't think it would be worth the effort to build a jig. I've never seen that Richardson machine, so thanks for sharing it. |
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Post by TheRock on Sept 25, 2018 2:05:23 GMT -5
Nice Grinding work Rob!  |
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