hex socket bolts

[Delwin D Fandrich]

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As far as I know the only tests done on this subject were by Lee Valley tools
and WoodenBoat magazine. In general they found that withdrawal strength was
moderately higher with untapped holes.
 
Del


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From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On Behalf Of
David Love
Sent: September 01, 2005 7:22 AM
To: 'Pianotech'
Subject: RE: hex socket bolts



Terry:

 

Where did you get the long hex bits and the red handled T driver.  Also, what
size do you drill before you tap?  Can these screws be driven in after the hole
is drilled?  After all, I do press in new capstans, though the wood in keys
tends to be somewhat softer.

 

David Love
davidlovepianos@comcast.net 

-----Original Message-----
From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On Behalf Of
Farrell
Sent: Tuesday, August 23, 2005 10:26 AM
To: Pianotech
Subject: Re: hex socket bolts

 

Well, as long as it is show and tell time, I guess I'll jump into the fray!
Below is a picture of the system/parts/tools I am using for plate support and
adjustment. Pretty much the same as Ron N and others, except I think I interject
a little bit of overkill for better sleep. As someone pointed out, often the
original screw holes are not very straight. So I just drill them out with a
half-inch bit and epoxy in hardwood plugs. Then I line up the plate properly and
drill nice straight holes with my overhead drill press. Then I tap the holes
(tap - with extension - is the long silver thing on top). I have a long hex bit
(lower right) that I chuck into an electric drill for most of the screwing
action. Then I use the red-handled hex-bit "T" driver for fine-tuning the
height. Three of the 4" x 3/8"-16 set screws are on the lower left. The left
most is bare, the center one has the thin nylon lock nut that the plate sits on,
and the right one has the acorn nut that goes on top of the plate (I also put a
ss washer between the acorn nut and the plate). This system seems to work quite
well.

 

Terry Farrell

 




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