[modeleng] Re: unknown thread
- From: "alanjstepney" <alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Fri, 15 Oct 2004 10:56:29 +0100
Tim,
6BA is indeed 1mm pitch.
For comparison,
20 Thury V 20 BA.
OD / TPI
Thury: 0.189"/208.2 tpi
BA 0.1895" / 211.7 tpi
To me, that looks sufficiently different not to have the same thread form.
Alan
----- Original Message -----
From: "Tim Rickard" <the_viffer@xxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Friday, October 15, 2004 10:35 AM
Subject: [modeleng] Re: unknown thread
Peter the BA thread s a totally metric thread. There is a mathematical
relationship involving non integer powers that lets you calculate the
dimensions of any BA thread starting from 0BA which is 6mm diameter and as I
recall 1mm pitch. There are details in Tubal Cain's Workshop Handbook but
I'm glad to copy it out and either post it here or sent it to individuals if
there is any demand. I dread to think how they set up a lathe to cut them
the first time.
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