[pianotech] antique plate cracks, weld or junk it?

John Delacour JD at Pianomaker.co.uk
Thu Jan 15 23:16:24 PST 2009


At 21:49 -0800 15/1/09, Greg Graham wrote:

>For those who have successfully repaired plate cracks, does this one 
>look workable?  I've never dealt with plate repair, and certainly 
>not an antique, open block plate at that.

Although the few Danish pianos I've come across have been of good 
quality, I haven't come across one by Wulff's successors.  There is 
nothing extraordinary about the case and I'd say that the iron frame 
is designed to crack where it has cracked and could easily crack 
again even if it were professionally stitched.

Early pianos with an open plank almost always had the front bar 
widened in a curve from the tenor upwards reaching nearly to the 
pins, providing rigid support.  This practice was continued well into 
the era of the full cast-iron frame.  When they switched to a 
parallel lock rail the strength provided formerly by 60 mm of 
hardwood was provided by the now customary iron web.

This piano has neither and is therefore intrinsically weak.  The bars 
could be stitched (certainly NOT welded) but at the end of the work 
the value of the piano would certainly not be even a quarter of the 
added labour and materials.

JD





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