Re: [CAD_CAM_EDM_DRO] Re: 1/2-12 thread

Hello Ron,
this explains the strange threads I had on a Blanchard
grinder with flat leather belts I rebuilt back in 1995.
We didn't find any information about the year. Serial no about
1587 if I remember right.
I estimated it to the 30's. So it might be even older.
The main castings seem to have been used until the 60's.
Thanks for the information.
Sven Peter

ron ginger wrote:

>
> 1/2-12 was a common US thread on old machinery. I believe the change to
> 1/2-13 was an SAE standard that happened about 1920. I have made 1/2-12
> bolt for several old marine engines.
>
> ron ginger
>
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