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Model Forum / General / Models / July 2010m14 x 0,5 drill
Anyone know what size of tapping drill I would need for the above thread (it's pretty non-standard, and not in my tables), and where to get one? Thanks -- Peter Fairbrother >Anyone know what size of tapping drill I would need for the above thread >(it's pretty non-standard, and not in my tables), and where to get one? > >Thanks > >-- Peter Fairbrother 13.5 should do it. Mark Rand RTFM > Anyone know what size of tapping drill I would need for the above thread > (it's pretty non-standard, and not in my tables), and where to get one? > > Thanks > > -- Peter Fairbrother The core diameter (tapping drill size) for any 60 degree thread (metric, UNC/F) is always the o/d minus the pitch so 13.5mm. That is certainly a most unusual thread size though unless it's a typo. 14 x 1.5mm is much more likely.  SignatureDave Baker M14x1 is used for the headstock of some small lathes e.g.Cowells, Unimat 3. I suspect 13.5 is a bit big, Looking at Tubal Cain's "Drills, Taps and Dies" it would appear that 13.2 would give a 75% engagement. Measuring some of my Cowells chucks gives me between 12.95 and 13.2. Given that some extrusion might take place I would go for 13.2 if you are using a tap. Possibly a bit less for screw cutting in the lathe. -- Roger Woollett > M14x1 is used for the headstock of some small lathes e.g.Cowells, Unimat > 3. [quoted text clipped - 5 lines] > that some extrusion might take place I would go for 13.2 if you are using > a tap. Possibly a bit less for screw cutting in the lathe. What does the tapping drill size for a 14 x 1mm thread have to do with a 14 x 0.5mm one? SignatureDave Baker > What does the tapping drill size for a 14 x 1mm thread have to do with a 14 > x 0.5mm one? > -- > Dave Baker I don`t know.I give up.Please tell. :-) Mark. |
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