[modeleng] Re: coarse threads

I've seen very coarse threads used for focusing some photographic equipment.
Not really a thread but a shallow, half-round groove with a spring loaded
ball for engagement. Doesn't the Quorn T&C grinder use a very coarse thread?

> -----Original Message-----
> From: modeleng-bounce@xxxxxxxxxxxxx [mailto:modeleng-bounce@xxxxxxxxxxxxx]
> On Behalf Of Alan Stepney
> Sent: Thursday, January 25, 2007 4:17 AM
> To: modeleng@xxxxxxxxxxxxx
> Subject: [modeleng] coarse threads
> 
> I am restoring an old lathe.
> 
> The thread cutting chart attached to its lists threads down to 2 and 1tpi.
> What on earth would use those?
> 
> Alan Stepney
> 
> http://www.alanstepney.info
> Model Engineering & steam engine information pages
> 
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