[pianotech] Brass plate tap sizes

[John Ashcraft]

Joe,
If you counted *51* threads per inch, that would be 2 X 25.4, which would
work out to .5 mm, which worked for me. Some old screws really are metric.
--John Ashcraft


On Sat, Feb 23, 2013 at 2:25 PM, Joseph Garrett <joegarrett at earthlink.net>wrote:

> Ron said:
> "I worked out the numbers, and these are 3-56, a standard size"
>
> Ron,
> For all practical purposes, yes that is what my gauges tell me.....er
> sorta.<G> Honestly, it did not occur to me to "do the math" conversion!<G>
> If the 4.5mm threaded hole was more than 1/2 inch, it would start to bind
> with a 3-56. At least that's what my gauges are telling me.<G> However, in
> this application, where the threaded material is less than 1/16", it's not
> an issue.
> There still remains, tho, what the heck all of those NOS plates/screws, I
> have, are? As near as I can calculate, the thread count is around 52 tpi! I
> don't know of any "standard" that fills that bill. Go figger.
> Thanks for your help and enlightenment.<G>
> Best,
> Joe
>
>
> Joe Garrett, R.P.T.
> Captain of the Tool Police
> Squares R I
> http://gpianoworks.com/
>
>
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