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| what size drill bit? http://w-ww.luthiersforum.com/forum/viewtopic.php?f=10102&t=6439 |
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| Author: | ecklesweb [ Sun Apr 30, 2006 3:01 pm ] |
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What size drill bit do I want to use for Schaller scallop-style tuners with press-fit bushings? 21/64 is a little snug - I'd have to find a way to hammer the bushings down. 22/64 is a little loose - I'd have to put a drop of CA or some other adhesive or maybe wrap a piece of masking tape around the shaft of the bushing. I'm leaning towards the 21/64, I'm just worried about cosmetically damaging the bushing when I try to hammer it home. |
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| Author: | Rod True [ Sun Apr 30, 2006 3:06 pm ] |
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What if you drilled the 21/64 hole and just wraped some sand paper around a 5/16 bit and drilled/sanded slowly to open it up? Just a thought. |
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| Author: | Cocephus [ Sun Apr 30, 2006 3:13 pm ] |
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Tap, tap, tap with a neoprene (plastic) hammer? Depending on how tight they really are... |
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| Author: | Alain Desforges [ Sun Apr 30, 2006 4:06 pm ] |
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10 mm? |
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| Author: | Kim [ Sun Apr 30, 2006 9:34 pm ] |
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I think they may well be 10mm, but test drill some scrap and try it out. When you are fitting them, use a hardwood drift to set them home and you will not mar the finish. Cheers Kim |
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| Author: | Bruce Dickey [ Sun Apr 30, 2006 9:53 pm ] |
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A tapered ream is the proper tool. Shouldn't be too expensive. But then I got mine at a salvage equipment place for fifty cents. |
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| Author: | 1bordeaux [ Sun Apr 30, 2006 11:10 pm ] |
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Jay, If you have a drill press, Chuck a carraige bolt or something similar and use it to press in the bushings. I use a large round head carraige bolt which gives me more of a sight line so I don't over press. |
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| Author: | Phil Marino [ Sun Apr 30, 2006 11:38 pm ] |
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Try either a size "Q" or size "R" drill. Here are the sizes in decimal ( rounded to the nearest 0.001 inch): 21/64 - .328 Q - .332 R - .339 22/64 - .344 Both of these drills are "lettered drills" and are between the two sizes you tried. These are machinist size drills. You can get a complete set of numbered and lettered drills (115 drills, altogether) from Harbor Freight for about $30. These range from 0.040 inch diameter to 1/2 inch. I bought a set recently, and I wish I had years ago. It's great to have the EXACT size drill you need. (or, usually within a couple of thousands of an inch). Right now Harbor Freight has a titanium nitride coated set on sale for $40., but I have a "plain" HSS set from them, and they work great, even drilling steel. Also, if you have a good hardware store nearby, you may be able to buy just the individual drill you need (Q or R) but it's real convenient to have the whole set. Phil |
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| Author: | old man [ Mon May 01, 2006 12:30 am ] |
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My Schallers need a 10mm hole. Ron |
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| Author: | Colin S [ Mon May 01, 2006 12:54 am ] |
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Yep 10mm. Colin |
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| Author: | charliewood [ Mon May 01, 2006 3:22 am ] |
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I have a good trick for turning your regular hammer into a non-marring hammer, that will prevent cosmetic damage you speak of. Take a rubber foot - the ones that go under aluminum round frame fixtures, tables, old man walker's, crap like that and just slide it over your hammer end - voila, I find that it works so good that I use the thing on more than off these days. Its not a drill bit solution but its a hammer that sucker in solution. Cheers Charliewood |
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