I think that a dolly would appear less'rigged' that the addition of wooden rails. The dollies are only about $150. Jon Page At 10:54 PM 04/09/2001 -0500, you wrote: >Susan, Mark, Greg, Jon, Newton, CAUT, > >Some additional info: > >These particular pianos roll quite easily with the existing casters, though >the idea of using a different dolly system would change the potential >'racking' (assuming this means twisting?) by the different location of the >wheels. > >However, it just so happens there is a 1971 U1 in a classroom across the >hall that has been here since new and one I don't ever recall having this >type problem. > >So, I decided to compare the structure of it against a 1998 U1 that does >exhibit this problem. I came up with some interesting dimensional numbers >plus a potential cure for this tuning instability as a result of doing this. > >Here's what I found: > >1) The five back posts are not the same. > 1971 U1 3 9/16" D x 2 5/8" W > 1998 U1 2 9/16" D x 2 5/8" W > >2) The handhold devices in the rear for moving the piano are married >(joined) to the 2nd back post inward from the left and right back post on >the 1971 U1. On the 1998 U1 that does not occur. > >3) The 1998 U1 has what I guess is called a full perimeter plate. The 1971 >U1 does not. > >4) The cabinet sides, front to back are 7/8" longer on the 1971 U1 and are >thicker by 1/8" more. > >5) The feet of the 1971 U1 are 3/8" wider. > >By my measurements, observations and extrapolating, there is definitely >less wood in the back posts, and feet, plus less support between the back >posts due to the different handles. Maybe the full perimeter was an idea >that would compensate for this less wood, maybe not. > >Anyhow, here's the potential cure which I am going to implement upon >approval from the Piano Chair. I have used this following idea for sagging >shelves that had no support, so my thinking says why not for back posts >that have no support between themselves. > >I'm going to take three pieces of hard rock maple 1' x 4" x 57 1/4", locate >them evenly spaced from top to bottom and join the five back posts >together. I feel confident this will make a remarkable change in the >stability. > >Still open to any other constructive ideas that someone might have, or ones >that someone has possibly implemented and had success. > >Thank you all for being a sounding board :-) > >It is greatly appreciated! > >Keith McGavern, RPT >Oklahoma Baptist University >Saint Gregory's University >Shawnee, Oklahoma, USA
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