[modeleng] Re: Mystery thread
- From: "Jeff D" <jeffdayman@xxxxxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Wed, 21 Nov 2007 12:20:00 +0000
The .216 dia and between 24-28 thread lead me to think that the thread might
be M6x1.0, with a setscrew on the low side. I say so because M6x1.0 converts
to .236 dia x roughly .04 pitch, and .04 pitch is 25 TPI. I've seen lots of
setscrews and machine screws .01" to .02" low on dia. Further, a Lot of
later Rockwell machines were Taiwanese made, and use a lot of metric
threads. You might try an M6 screw in the hole just to see.
Good juck, Jeff Dayman
>From: "Chris Crosskey" <chris.crosskey@xxxxxxxxx>
>Reply-To: modeleng@xxxxxxxxxxxxx
>To: <modeleng@xxxxxxxxxxxxx>
>Subject: [modeleng] Re: Mystery thread
>Date: Wed, 21 Nov 2007 11:14:06 -0000
>
>I never cease to be amazed at some of the insane threadforms some people
>design in, I also try never to be without a supply of sensible grub
>screws and their relevant taps...
>chrisc
>
>-----Original Message-----
>From: modeleng-bounce@xxxxxxxxxxxxx
>[mailto:modeleng-bounce@xxxxxxxxxxxxx] On Behalf Of Harry Wade
>Sent: Wednesday, November 21, 2007 03:41
>To: modeleng@xxxxxxxxxxxxx
>Subject: [modeleng] Mystery thread
>
>I am presently converting a 14" Rockwell wood bandsaw for metal cutting
>and I need to match the thread of a grubscrew (missing) for a David
>Brown reduction gearbox, which I assume was made in the UK. The screw
>diameter measures .216" and the pitch is between a 24 and 28tpi but it
>is neither a 24 nor 28. The .216" is dead-on for a US #12 machine screw
>but it isn't that. Anyone have an idea what this thread might be?
>Regards,
>Harry
>
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