Re: [CAD_CAM_EDM_DRO] Re: Stuart 10V Steam Engine

Mike,

As I'm learning, "BA fixings" are probably the best made for our model
use. I sure am not anxious to tool up for metric sizes, and new
taps/dies. I'm still trying to educate my 18 & 21 year old sons.
Recently I found a 6-32 tap in the drill press! Seems my son thought he
could route/cut plastic sheet with it (he probably saw me using a small
mill)! So yeah, we're still learning here!

Alan

Michael Jones wrote:

>
> >I remember Cole from H.S., and will get their catalog. I was wondering
> >about the "BA fixings", they aren't metric, I wonder how they got
> >different from us (or us from them)? A long...long...time....ago.
>
> Actually, they are metric in pitch and diameter. BA threads were
> derived from a Swiss series used by watchmakers in that country. The
> preferred tapping and clearance drills are all in metric sizes. The
> 471/2 degree thread angle was empirically developed as working best
> in the materials and sizes normallly associated with Swiss watch and
> clock making.
>
> Mike Jones
> OId Lyme, CT
> Mike Jones
> Old Lyme, CT
>
> Please note my new e-mail address: mwjones99@...
>
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