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Post by TheRock on Oct 21, 2018 14:13:22 GMT -5
Jim, I Got MaryJane one of these Drill Presses Fron Rio Grande It Has A Chuck And You Can Adjust The Height She Drills Beach Glass and Makes Necklaces With It. You Can See It Here. It's Not Like My Big Dayton Floor Drill Press I have In My Garage Shop with a 1 horse MTR on it but it may do the job 4 you I dunno. She Has A Pan With A Piece of Wood Under Her Glass She Drills And Covers The Object With Water To Keep It Cool. ![](http://www.rockshow.rocktumblinghobby.com/i.php?/upload/2017/12/26/20171226163416-8dc3d9f7-me.jpg)
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jamesp
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Post by jamesp on Oct 22, 2018 7:34:30 GMT -5
Gee Bill, I don't see a way to break a small bit. I would think that much down pressure would have easily broken the agate or glass. I've broken 1mm bits when drilling by hand for eye-ups. I don't know what the reviewers were drilling or what size bit they were using. Thinking it might have been a thin bit into steel with too much pressure on a drill that wasn't coming down perpendicular. I see. I just never put much pressure.
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jamesp
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Member since October 2012
Posts: 36,353
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Post by jamesp on Oct 22, 2018 7:35:37 GMT -5
Jim, I Got MaryJane one of these Drill Presses Fron Rio Grande It Has A Chuck And You Can Adjust The Height She Drills Beach Glass and Makes Necklaces With It. You Can See It Here. It's Not Like My Big Dayton Floor Drill Press I have In My Garage Shop with a 1 horse MTR on it but it may do the job 4 you I dunno. She Has A Pan With A Piece of Wood Under Her Glass She Drills And Covers The Object With Water To Keep It Cool. ![](http://www.rockshow.rocktumblinghobby.com/i.php?/upload/2017/12/26/20171226163416-8dc3d9f7-me.jpg) Got as speed range you can share ? Oops, at bottom of description 5000-6500-8500, perfect. Perfect price too @$60. Thanks Duke.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,353
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Post by jamesp on Oct 22, 2018 8:51:09 GMT -5
Hole quality substantially better with 3mm core bits as opposed to solid end bits. Less wandering at entry. Best to move a core bit up and down out of hole a few times as hole progresses to break of core as it forms. Otherwise the core gets stuck in the core more often rendering bit useless till core is removed. ![](https://c2.staticflickr.com/2/1923/45443338392_ec75b9354e_c.jpg)
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Post by hummingbirdstones on Oct 22, 2018 9:11:20 GMT -5
Those holes look substantially better. ![:D](//storage.proboards.com/forum/images/smiley/grin.png) Always best to move the bit up and down to flush out the debris when drilling glass or stone.
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jamesp
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Member since October 2012
Posts: 36,353
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Post by jamesp on Oct 22, 2018 10:36:42 GMT -5
Those holes look substantially better. ![:D](//storage.proboards.com/forum/images/smiley/grin.png) Always best to move the bit up and down to flush out the debris when drilling glass or stone. It takes comfortable seating and close viewing access to get near perfect holes. The flex in the drill press bracket has been the worst issue. Is see the need for flushing. The hole gets dirty in a hurry. Another tool I want to address is a bead grinder that would cut round/oval focal sized beads. I have seen the ones that grind round beads but only occasionally and don't remember much about them. Have you seen one ? They have a rotating part that looks similar to this: ![](https://s-media-cache-ak0.pinimg.com/736x/04/26/70/0426703c79fe42f7b464228d25e69913.jpg)
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Post by Drummond Island Rocks on Oct 22, 2018 11:06:23 GMT -5
Those holes look substantially better. ![:D](//storage.proboards.com/forum/images/smiley/grin.png) Always best to move the bit up and down to flush out the debris when drilling glass or stone. It takes comfortable seating and close viewing access to get near perfect holes. The flex in the drill press bracket has been the worst issue. Is see the need for flushing. The hole gets dirty in a hurry. Another tool I want to address is a bead grinder that would cut round/oval focal sized beads. I have seen the ones that grind round beads but only occasionally and don't remember much about them. Have you seen one ? They have a rotating part that looks similar to this: ![](https://s-media-cache-ak0.pinimg.com/736x/04/26/70/0426703c79fe42f7b464228d25e69913.jpg) Covington bead mill forum.rocktumblinghobby.com/thread/72504/bead-mill?page=1forum.rocktumblinghobby.com/thread/72580/wip-marble-batch-photos-pageChuck
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Post by hummingbirdstones on Oct 22, 2018 12:04:03 GMT -5
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jamesp
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Post by jamesp on Oct 22, 2018 13:44:05 GMT -5
Give me a sintered diamond wheel with about 40 grit and a 1 inch to 1 1/8" diameter section of a spherical concave divot. A dome say 1/3 the diameter. I believe you could grind out small spheres quickly and close to perfect round with such starting with a sawn cube. I did this on the flat lap in 8 minutes, 1 3/8" including sawing 8 corners. Fairly worn 60 grit diamond plate. ![](https://c2.staticflickr.com/2/1946/44775235114_286dfcd863_z.jpg)
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jamesp
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Post by jamesp on Oct 22, 2018 13:49:41 GMT -5
There might be a more industrial machine that does small spheres. Looks similar to this : ![](https://i.ytimg.com/vi/liZbOki2T7k/hqdefault.jpg)
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jamesp
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Post by jamesp on Oct 25, 2018 12:33:32 GMT -5
To use this heavy duty old school Dremel drill press requires discontinued Dremel models 275-285-395. New Dremels do not fit it. These old models are sold on EBAY, some brand new. Dremel still has most of the parts for Type 5 and Type 6 series 275-285-395. i bought one of the discontinued units, can't deal with the flex in that new press. The old 212 press, very rigid: ![](https://c2.staticflickr.com/2/1911/44825078364_b8e14a44a4_c.jpg)
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Post by grumpybill on Oct 25, 2018 12:56:02 GMT -5
I test drove my newly acquired 212 last evening. My old Craftsman-branded Dremel fit perfectly.
It was also a test drive for the THK bits I bought. They're definitely superior to the ones I'd been using. Drilled 4 thick sea shells (just to get the feel of the 212), an agate, 2 jaspers and 2 amethysts before the first bit started screeching.
EDIT: After cleaning the tip of the screeching bit, I drilled 2 more jaspers and a granite pendant with it and it's still going strong. In my (not so) humble opinion, the THK bits cut faster and last much longer than the ones The Rock Shed sells...and they're cheaper.
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Post by vegasjames on Oct 25, 2018 13:17:02 GMT -5
Hole quality substantially better with 3mm core bits as opposed to solid end bits. Less wandering at entry. Best to move a core bit up and down out of hole a few times as hole progresses to break of core as it forms. Otherwise the core gets stuck in the core more often rendering bit useless till core is removed. ![](https://c2.staticflickr.com/2/1923/45443338392_ec75b9354e_c.jpg) There are carbide glass bits that work great. I have used them on glass and hard stones like jaspers.
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jamesp
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Post by jamesp on Oct 25, 2018 14:05:44 GMT -5
I test drove my newly acquired 212 last evening. My old Craftsman-branded Dremel fit perfectly. It was also a test drive for the THK bits I bought. They're definitely superior to the ones I'd been using. Drilled 4 thick sea shells (just to get the feel of the 212), an agate, 2 jaspers and 2 amethysts before the first bit started screeching. That press is really cast heavy. Like it a bunch. Good to hear it worked for you. Can't wait to get the old style Dremel and crank it up. Gott several different THK bits. all 3 of great quality. Some other brands are sure enough junk though.
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jamesp
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Post by jamesp on Oct 25, 2018 14:06:33 GMT -5
Hole quality substantially better with 3mm core bits as opposed to solid end bits. Less wandering at entry. Best to move a core bit up and down out of hole a few times as hole progresses to break of core as it forms. Otherwise the core gets stuck in the core more often rendering bit useless till core is removed. ![](https://c2.staticflickr.com/2/1923/45443338392_ec75b9354e_c.jpg) There are carbide glass bits that work great. I have used them on glass and hard stones like jaspers. Never thought about carbide James. Can you resharpen them ?
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Post by vegasjames on Oct 25, 2018 17:27:35 GMT -5
There are carbide glass bits that work great. I have used them on glass and hard stones like jaspers. Never thought about carbide James. Can you resharpen them ? Not sure, never tried. They are inexpensive. You can find them at hardware stores and even stores like Walmart. They look like spades. Here is a 10 piece on Amazon for about $1 per bit.
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jamesp
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Post by jamesp on Oct 25, 2018 19:55:46 GMT -5
Never thought about carbide James. Can you resharpen them ? Not sure, never tried. They are inexpensive. You can find them at hardware stores and even stores like Walmart. They look like spades. Here is a 10 piece on Amazon for about $1 per bit. Oh yea, I have used those on tiles. They work well on about all of the hardest tiles. I hope I can find them in 3mm.
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Post by vegasjames on Oct 25, 2018 21:30:53 GMT -5
Not sure, never tried. They are inexpensive. You can find them at hardware stores and even stores like Walmart. They look like spades. Here is a 10 piece on Amazon for about $1 per bit. Oh yea, I have used those on tiles. They work well on about all of the hardest tiles. I hope I can find them in 3mm. Here are 3mm bits:
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jamesp
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Post by jamesp on Oct 26, 2018 4:43:51 GMT -5
Oh yea, I have used those on tiles. They work well on about all of the hardest tiles. I hope I can find them in 3mm. Here are 3mm bits: Nice James. More tools for the arsenal ![:)](//storage.proboards.com/forum/images/smiley/smiley.png) . Thanks
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SirRoxalot
freely admits to licking rocks
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Post by SirRoxalot on Nov 3, 2018 14:39:11 GMT -5
$60-80 gets you a proper, relatively decent benchtop drill press. Your holes seem awfully big, wouldn't it be better to go smaller? Start each hole with a ball-tip bit in a dremel, that keeps the drill bit from dancing around and ruining the stone. Drill with pulsing action, one second down, three seconds up, slowly does it. Your glass looks phenomenal!
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