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Thread: Threading bit.
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20th July 2019, 07:40 AM #1Most Valued Member
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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.
Attached Images
- 03-07-2019-006.jpg (17.2 KB)
- 19-07-2019-012.JPG (146.0 KB)
- 19-07-2019-013.jpg (109.5 KB)
- 19-07-2019-014.JPG (127.6 KB)
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