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| DavidA:
When cutting BSF threads there is a formula that allows one to derive the thread root diameter. This is very useful as it means you can turn a bit at the end of the tread to know when you are down to full depth. It is Root Diameter = OD - (1.28066/TPI) Where OD = Outside Diameter and TPI = Threads Per Inch. My question is , is there a similar formula to carry out the same operation on ISO Metric threads ? My specific need being to know the root diameter of an 2 MM pitch thread on a 22 MM bar. Dave. |
| awemawson:
Dave, The depth of thread is independent of the diameter of the bar you are threading, so just look up the depth of thread for any 2 mm pitch then subtract it from your bar size. Or use the factor of 0.614 2 mm pitch has a thread depth of 0.614 x 2.0 = 1.228 http://www.newmantools.com/tech/threadm.htm |
| DavidA:
Andrew, Thanks, that was exactly what I wanted to know. Dave. :thumbup: |
| lordedmond:
David I just deduct the pitch from the dia Ok for tapping drill and single point See ref in above link for 12 mm 2mm pitch yes that's a standard one but in your case the root dia is 20mm Stuart |
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