[modeleng] Re: Tap Geometry

I would think the three flute tap would be stronger.  I use almost only two 
flute spiral point taps myself and they are the strongest of the lot by far. 
Two flute taps almost must be guided by a tapping fixture as they are hard 
to start freehand, but the additional strength and free cutting makes them 
worthwhile.  To be correct, spiral point taps are intended for auto-tapping 
machines and holes should be drilled through the workpiece.  However, if 
holes are drilled deeper than necessary, there is no problem.  I just 
recently tapped over fifty #1-72 holes in brass and broke nary a tap.  None 
of those holes were drilled through, but I did use a tapping stand (or 
guide) to keep the taps straight.

Jesse in the USA

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