Plate pin hole size

[Delwin D Fandrich]

John,

If you're drilling these holes using a very heavy duty overarm drilling machine, it's size
on size. It's not likely that you have one of these in your shop, so... If you're drilling
by hand using a portable electric drill, start with a number size drill bit a couple of
sizes smaller -- A #23 or #24?  I don't remember the diameters of these drill bit off
hand. Number size drill bits are just one more reason for converting to the metric
measuring system. -- and work up. Use the larger drill bits just as reamers. Test as you
go. Use a bit of light machine oil on the pin as you drive it in.

Del

John R Fortiner wrote:

> Dear List:
>         When drilling a hole in a cast iron plate in order to install a
> new plate pin that measures 0.157" should I use a slightly undersized bit
> like 5/32 which is 0.1562 or should I drill a hole that is 0.157" with a
> #22 drill bit?
>
> Thanks so much in advance?
>
>                              John R. Fortiner
>                              pianoserv440@juno.com