Blunt start thread/Higbee cut
Blunt start thread/Higbee cut
(OP)
Hello, I have read the post on here a few years back regarding how to remove the feather edge on the end of a thread, but am having trouble describing the process to the machine shop that makes our parts. Does anyone have a diagram or video that would do a good job of showing how it's done? Thanks!





RE: Blunt start thread/Higbee cut
- No diagram, but we describe it as ... "Mill or cut back thread ends to the FIRST FULL CROSS SECTION of thread (i.e. Higbee Cut). The removed portion of the thread MUST be milled down FLUSH or slightly below flush to the thread root, or surrounding base metal." If the root is not completely removed flush or below, the mating parts may bind up.
- For the very heavy mating parts that we use this on, it works great!
1st) It takes away the safety issue of the knife edge.
2nd) It makes the thread ends very damage resistant, and
3rd) It makes the test threading of mating parts together a snap ... just back the threads off until you feel or hear the "clunk" of the thread ends dropping together, and then reverse the direction, and start threading.
- We've been doing this for years on parts that weight as much as 1000 lbs, and if machined properly, it really works great. I am sure you would get similar results with other types of threads. Hope this helps.
RE: Blunt start thread/Higbee cut
RE: Blunt start thread/Higbee cut
www.fs.
Mike Halloran
Pembroke Pines, FL, USA
RE: Blunt start thread/Higbee cut
RE: Blunt start thread/Higbee cut
Found it with Google. You can, too.
Not that many ppts in the results.
I was meaning to bring up the point that verbal instructions to vendors produce inconsistent results. In the case of ISO vendors, no change whatsoever.
You need to figure out exactly what the result looks like on your geometry, and put it on your drawings.
Mike Halloran
Pembroke Pines, FL, USA
RE: Blunt start thread/Higbee cut