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Harpsichords and Related Topics

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From:
Richard Schaumloffel <[log in to unmask]>
Reply To:
Harpsichords and Related Topics <[log in to unmask]>
Date:
Sun, 6 Mar 2016 20:04:44 -0600
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Andrew has invited me to respond. Many years ago I was told to use only hide glue I thought for reasons of authenticy rather than understanding the real reasons ie no creep, regluability of broken joints containing glue residue and ability to unglue things for repairs. I eventually changed to titebond purely for commercial reasons ie speed of assembly. This happened because some clients did not appreciate that I had gone to some trouble to use hide glue.

Wilst joints are a good thing in firniture correctly glued joints using the right glue are immensly strong, the Donzelague is an example it has no joinery everything is mitred or butt jointed just like the old hubbard French double kit mine has held together for several horrific summers although I have still not strung it yet

Generally titebond doesn't creep at normal domestic air temperatures on the other hand expose it to extremes  nasty thing can happen a case in point , a new professionally built Zuckermann flemish double was delivered to an important music school in my home town amid some pomp and ceremony some days afterwards it was placed in storage in an uninsulated wooden classroom during a heat wave subsequently everything moved out of alignment. At the time I was kept in the dark about this and was only told about this many years later. My own personal experience with titebond is similar, I have a client who insists in storing a small french single of mine in a converted uninsulated garage at times it would be subjected to the extremes of our summer, it is doing nasty things.

 To sum up if a titebond harpsichord is kept in an old stone or double brick house generally it should be safe even so I have stopped using it except for gluing on hammer heads on fepos because I can adjust them with heat. Other adhesives havn't been discussed much we used urea formaldehyde in the past it is very strong and glass hard but not shock resistant. I fear that in time it may break down and turn to powder. I sometimes use marine epoxy it has some give but I think that is more an elastic effect rather than creep. I do use resorcenol formaldehyde for creating wide boards from narrow it is totally boil proof and probably very permanent. 

Richard

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