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Old 01-30-2019, 11:27 AM   #1 (permalink)
 
Join Date: Mar 2009
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Default Stone pen blank

My son gave me a stone pen blank he picked up. Any hints or suggestions before I put this on the lathe. Realize I am going to need carbide tools to work this and probably should knock the corners off on a disc sander prior to starting. Figuring on drilling on lathe so need to find a way to place a block behind the end to prevent blowout. Just looking for helpful hints since it was a birthday gift.


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Old 01-30-2019, 12:00 PM   #2 (permalink)
 
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What kind of stone? How hard is it? Research mohs scale and test the hardness. If the hardness is below 3-4 you can drill and turn on a standard wood lathe. For mohs 5-6 you might be able to turn with carbide cutters is you are slow and careful. For mohs 7-8 and above you will need a lapidary lathe with a water cooled grinder cutter.

Try masonary bits for drilling. Drill with a small bit and them move up with multiple larger bits to get where you need to be.

Drill and turn with good ventilation, depending on what kind of stone or mineral, you could be breathing some dangerous dust.
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Old 01-30-2019, 12:14 PM   #3 (permalink)
 
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Excellent info Chasper.

My question to Teacher is --
is the blank a stone like sandstone, marble, etc or
is it a Tru-Stone blank.
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Old 01-31-2019, 11:31 AM   #4 (permalink)
 
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Thanks for the info guys, did some you-tube viewing and also called the store where my son bought the piece. They say it was Young-stone(sp), similar to Tru-stone, a mixture of ore & resin. So will give it a go after this weekend. Too many irons in the fire and too cold work in shop. Will post a pic when I get it done.
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Old 01-31-2019, 05:00 PM   #5 (permalink)
 
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Yun-Stone, it's similar to tru-stone. Go slow when drilling, you don't want to build up too much heat. Some colors may be harder than others. Sharp tools, light passes and you'll be good to go!
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Old 01-31-2019, 06:32 PM   #6 (permalink)
 
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Cut your blank long and do not drill all the way through. You can cut the end to open the hole. This will help prevent fractures or breaking out the exit end while drilling.
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