This is a multi-part message in MIME format. ---------------------- multipart/mixed attachment > -----Original Message----- > From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]On > Behalf Of Sarah Fox > Sent: April 21, 2004 7:31 PM > To: Pianotech > Subject: Re: Action Rail Hole Spacing > > > Hi Thump, > > Not that I posed the original question, but... > > Nothing would be wrong with that. I suppose it's more a matter of the > precision with which one is to do the work and/or the speed of higher > precision production. If you want to turn out beautiful action work, you > should maximize use of jigs and minimize the use of measuring sticks and > pencil marks, IMO. Although I'm not a professional piano tech, I've done a > fair amount of machine work, and in my experience, the human eyeball and the > human hand just don't cut it. But then again, I'm used to measuring > distances in microns (1/1000 mm), so I might be the wrong person to comment > on this. ;-) Still, it seems whenever I resort to pencil marks, my eye > tells me the end product could have been done more accurately. > > Peace, > Sarah > _______________________________________________ I guess the question is "the precision with which one is to do the work." Or, more appropriately, "the precision with which the work was originally done." These scales were laid out on paper tacked to a solid wood panel. True, the wood panel would have had stiffeners screwed, not glued, to the bottom side. But, still.... The spacing would not have been developed mathematically but by the use of a layout fan as illustrated in the attached drawing. The two end points would have been marked off along the hammer strike line with a pencil line and/or a pin-prick and the layout fan would have been arranged across until the appropriate (as determined by the eye of the designer) spacing was achieved. Then the appropriate points would have been pin-pricked through and the points drawn in by hand with pen and ink. Precision even to the width of a pen or pencil line is beyond what most of the early piano designers and builders would have achieved. Or even attempted. Del Delwin D Fandrich Piano Designer & Builder 512 Hanna Avenue Aberdeen, Washington 98520 USA Phone 360.532-2563 Fax 360.537-1262 <mailto:fandrich@pianobuilders.com> <http://www.pianobuilders.com> ---------------------- multipart/mixed attachment A non-text attachment was scrubbed... Name: Layout Fan -- S.jpg Type: image/jpeg Size: 116745 bytes Desc: not available Url : https://www.moypiano.com/ptg/pianotech.php/attachments/e2/40/84/ba/LayoutFan--S.jpg ---------------------- multipart/mixed attachment--
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