[pianotech] Brass Rail

[John Ashcraft]

I had a machinist help me replicate a Kimball rail a few years back. It seem
that we had to order an M3 X .5 tap, which worked fairly well. (The real
challenge in that job was adding the dimples.)

John Ashcraft


On Sun, Sep 19, 2010 at 7:15 PM, John Ross <jrpiano at eastlink.ca> wrote:

> I misplaced my thread guage. Well I obviously put it in a safe place, and
> forgot where it was.
> I probably won't get around to buying the tap and die, but now the
> information is out there, for others to follow through.
> Great list this, a wealth of knowledge, freely shared.
> John Ross
> Windsor, Nova Scotia
>  On 2010-09-19, at 6:54 PM, Ron Nossaman wrote:
>
> > On 9/19/2010 3:49 PM, John Ross wrote:
> >> Thank you very much, Roger.
> >> Your letter explains the dilemma, with apparently no real fix, other
> than do the best you can.
> >> APSCO was where I used to get the exact replacements.
> >> Tuner's Supply also supplied the correct ones.
> >> 3-48 is a size that Micro Mark carries, so I guess that will be the
> closest.
> >> I seem to remember that Mr Schandler (sp) of APSCO continued selling
> screws after Schaff bought him out.
> >> Does anyone know if he still does?
> >> John Ross
> >
> > Hi John,
> > Yep, I looked at the wrong line. Screwed up, sorry. It is indeed a #3,
> but it's neither 48, nor 56 threads per inch. My 26 tpi gauge neatly and
> precisely fits every other thread, which makes it 52tpi. At least that's
> what my jar full of leftovers are.
> >
> > That makes the closest match M3 x .5, which is 0.020" (0.5mm) bigger than
> the original, at about 50.8 tpi, and there are both screws and taps
> available in this size.
> >
> > Ron N
>
>
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