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Thread: Threading bit.
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20th Jul 2019, 06:57 AM #1
Threading bit.
Hi Guys,
Some of you might recall that I found a tin of various bits and pieces recently. (See thread "Scrap Yard Goodies") One of the items in the tin was a threading tool.
03-07-2019-006.jpg
This is the tool circled in red.
19-07-2019-013.jpg 19-07-2019-014.JPG 19-07-2019-012.JPG
It is a 55 degree threading tool bit. As it happens I needed one today and this was all that I had. It wasn't until I had used it that I discovered that it was actually a carbide tip. It was brazed onto a piece of 5/16" mild steel bar and obviously ground using a tool and cutter grinder. At 50 rpm it did a very reasonable job of single pointing a 7/16" X 18 tpi thread (7/16" BSF).
Bearing in mind how old the other items in the tin could have been, I find it remarkable that someone hand made this thread cutting tip. The 60 degree counter sink bit, just to the left has also been hand made.Best Regards:
Baron J.
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20th Jul 2019, 07:41 AM #2
Its not all that hard to do, if you have the gear and the patience. It was a common occurrence when I was an apprentice.
Hafco AL320G Lathe
Toolex RF31 Mill/Drill
Saber Bandsaw
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20th Jul 2019, 09:30 PM #3Member
- Join Date
- Nov 2009
- Location
- australia
- Posts
- 57
Nothing new about that at all, it's still done today --------
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