CA gluing Grand pinblocks & Uprights My take on it

[gordon stelter]

And wear a carbon filter mask and goggles! I'm sure
breathing this much CA fume is not good for you!
--- Billbrpt@AOL.COM wrote:
> In a message dated 7/30/02 11:30:39 PM Central
> Daylight Time, 
> mfarrel2@tampabay.rr.com (Farrell) writes:
> 
> 
> > One clear thing I have noticed about CA glue is
> that it has little shear 
> > strength. Take two flat pieces of wood. Glue the
> flat faces together with 
> > CA (I would use thick or medium). After cure, just
> tap the end of one of 
> > the boards while holding the other (so that you
> are applying a shear 
> > stress) - they will break apart very easily. I
> often use this to my 
> > advantage when making temporary jigs (like for
> locating bridges, etc.).
> > 
> I haven't been able to follow much of this or any
> recent threads but this 
> caught my eye.  The fact that the shear strength is
> weak is why CA glue 
> pinblock doping actually works.  If the glue could
> really hold the pin, it 
> would be stuck so hard and fast that it could only
> break when trying to turn 
> it.  Yet, the bond gives way on first impact but the
> material has still 
> filled a gap and is nevertheless somewhat sticky. 
> This sometimes makes for a 
> good repair for loose tuning pins.
> 
> This also is the reason why CA glue is good for
> repairing stripped screw 
> holes.  I usually put some glue in the stripped
> hole, dip the screw in the 
> catalyst, then insert the screw.  It goes in easily
> but within seconds, the 
> glue is cured and initially, the screw is stuck. 
> But one turn with a 
> screwdriver and the initial bond is broken, leaving
> a filled gap and a sticky 
> surface.  The repaired screw hole often feels like
> it had been plugged with 
> hard rock maple and redrilled.  If a first attempt
> at this is less than 
> satisfactory, then a repeat attempt will often work.
> 
> One person asked me privately about restringing
> using CA glue as pin driving 
> fluid.  The same idea works here.  If you are
> restringing a piano with pins 
> that had a good feel, using CA glue as pin driving
> fluid will allow you to 
> use the same sized pin again, avoiding the trauma to
> the pinblock of using 
> over sized pins.
> 
> One caution about doing the latter, cover your
> support jack with something 
> disposable because some CA glue could run down and
> glue the support jack to 
> the underside of the pinblock.  But again, even in
> the event this happens, a 
> good, sideways whack with a sledge hammer will break
> the bond instantly.
> 
> Bill Bremmer RPT
> Madison, Wisconsin
>  <A HREF="http://www.billbremmer.com/">Click here:
> -=w w w . b i l l b r e m m e r . c o m =-</A> 
> 


__________________________________________________
Do You Yahoo!?
Yahoo! Health - Feel better, live better
http://health.yahoo.com