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#1 Jack Zuraw

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Posted 11 September 2003 - 11:07 AM

Greetings All,
I do not remember ever reading an explaination of the crescent or circular shaped marks cut into the seat below the pads on the Lachenal concertinas that I have seen. Do these aid the separation of the pad from the wood surface? Were the pads intended to seat witin this circle? Were the pads trimmed in place? In a cost conscious production shop these marks can't be random, can they?
Jack

#2 d.elliott

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Posted 11 September 2003 - 11:35 AM

These scribed circles are used on lachenal, wheatstone and other 'traditional' makes, I was told by Steve Dickinson that their purpose is to help align the pads on assembly. Certainly when they are not present I usually put faint pencil marks on the pad board for that purpose. I can only accept that Steve is right, and use them with thanks to the chap who had the idea in the first place.

Dave

#3 JimLucas

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Posted 11 September 2003 - 02:07 PM

I suspect the marks are no extra effort to add, either. Cutters for drilling big holes are just blades (or gouges, or whatever you want to call them) mounted in an arm on the the drill that drills the center of the hole. Add a second one, not so deep, and it will not only score that little circle, it will tell you when to stop with the deeper one.

#4 d.elliott

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Posted 12 September 2003 - 02:12 PM

funny you should make that deduction, I had always assumed a two stage cutter as well, but I am currently servicing a very nice edeophone baritone, and this has some of the scribed circles eccentric to the relevent pad holes. :blink:

Dave

#5 Jack Zuraw

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Posted 12 September 2003 - 02:52 PM

... currently servicing a very nice edeophone baritone, and this has some of the scribed circles eccentric to the relevent pad holes...

Interesting. Are/were the pads the same diameter of and located within the circles?
Jack

#6 d.elliott

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Posted 13 September 2003 - 09:33 AM

... currently servicing a very nice edeophone baritone, and this has some of the scribed circles eccentric to the relevent pad holes...

Interesting. Are/were the pads the same diameter of and located within the circles?
Jack

Jack,

There are two different pad diameters fitted, some of which have been clipped to fit. The location of the smaller pads (16mm) is more or less to the scribed circles, but this location is never too precise anyway. The bigger 20mm pads have no inscribed circles, so its by eye and experience. I use four small pencil marks as guides.

Dave




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