Tech tip,B/R holes

[Farrell]

Hi Roger. I've been using the Spurlock system for my key bushings. He has a set of mortice sizing cauls that you insert into the mortices after removing bushings and let the wood dry over night. These seem to work very well. Are you aware of these? Are you suggesting that your method has advantages over the mortice sizing cauls - or just better than not addressing it?

How does the method you describe size the mortice? I'm trying to envision it and all I can see happening is that the bushing is getting ironed.

****After finishing his first cup of coffee - Terry re-evaluates his response to Roger's post.****

Sorry Roger. Itis very early in the morning. I am leaving the above just as an example of how easy it is to misread a post. After re-reading your post for the fifth time, I see you are sizing balance rail holes - not mortices! OK. Now I get it. Geeeesh! Let me grab that second cup of coffee.....

Now for a pertinent question/response to your post: When you run the drill-mounted balance rail pin throught the mortice and balance rail hole from the top, do you make an effort to sweep the pin through the front-to-back extents of the mortice so that the balance rail hole gets its little needed angles to accomodate this movement when the key is installed in keyframe? Or will that make it too loose - maybe induce pulley key? Or do you just go through the middle of the mortice and pump up and down twice (that's what I gather from you description - but it is early of course - or is this post about how to level a keyframe  :-)  ???)?

Thanks for the tip.

Terry Farrell
  
----- Original Message ----- 
From: "jolly roger" <baldyam@sk.sympatico.ca>
To: <"caut@ptg.org"@sktnsk01d050501116.sk.sympatico.ca>
Cc: <pianotech@ptg.org>
Sent: Monday, February 25, 2002 12:15 AM
Subject: Tech tip,B/R holes


> Greetings All.
>                         A tip that may help those that rebush keys
> 
> After steaming out old bushings, the balance rail hole swells to the point
> that they are far too tight.  The following method, I have found to
> perfectly size the balance rail hole.
> 
> Rebush keys and leave the cauls in place for 24hrs to size the bushing cloth.
> 
> Using a new polished balance rail pin that has been polished.  Use the pin
> in a battery operated drill,  pump twice through the mortice and balance
> rail hole from the top side, (this ensures the hole is parallel with the
> bushing cloth.)  just a quick burst of the switch, balance rail hole is
> perfectly sized.  The whole set can be done to perfection in a few minutes.
>  Takes the guess work out of where the friction problem is happening, the
> hole or the bushing cloth.
> 
> Hope this will help  some.
> 
> regards Roger
> 
> regards Roger
>