HARO50 Posted February 2, 2024 Report Posted February 2, 2024 (edited) This post was recognized by John Morris! "Thanks Haro for submitting this topic. Member What's It's are great topics to be sure, and your images are nice and clear, excellent job!" HARO50 was awarded the badge 'Great Content' and 10 points. Found this in a box of assorted scrap, but curiosity got the better of me! It LOOKS like someone fashioned a slot screwdriver bit out of an old 5/16" drill bit, but the grind looks like it was done by a machine, very neat and even. What REALLY caught my attention was the 5/16" SQUARE hole dead center in the shaft, and about 5/16" deep! The whole thing is 3 1/16" long. Any ideas? There is a diamond on the shank with "WILT" in it, and a "/16", apparently the "5" above it was worn off. Edited February 2, 2024 by HARO50 Cal, Grandpadave52 and DuckSoup 3 Quote
Gene Howe Posted February 2, 2024 Report Posted February 2, 2024 Probably out of some sort of heavy duty cnc milling machine. Grandpadave52, Cal, HARO50 and 1 other 4 Quote
Popular Post HandyDan Posted February 2, 2024 Popular Post Report Posted February 2, 2024 May have been an attempt, successful or otherwise, to make a square drive shaft. A flexible shaft for rotary tools use a cable with square ends. They happen to be the same cable as the speedometer cables used to be. About a 1/8" square hole. That is my wild arse guess anyhow. Gerald, Cal, Gene Howe and 4 others 7 Quote
Grandpadave52 Posted February 2, 2024 Report Posted February 2, 2024 Interesting tool. Haven't got a clue what it is, but if I ever need to borrow one good to know you have it. Cal, Gene Howe, HARO50 and 1 other 4 Quote
HARO50 Posted February 2, 2024 Author Report Posted February 2, 2024 12 hours ago, HARO50 said: What REALLY caught my attention was the 5/16" SQUARE hole Sorry, I had a senior's moment there. the hole is just under 1/8" square. Grandpadave52 and Cal 2 Quote
HandyDan Posted February 2, 2024 Report Posted February 2, 2024 19 minutes ago, HARO50 said: Sorry, I had a senior's moment there. the hole is just under 1/8" square. Falls right in line with the flex shaft theory. Pretty much all of them use that size. Do you have one to try? Grandpadave52, Cal, HARO50 and 1 other 4 Quote
forty_caliber Posted February 2, 2024 Report Posted February 2, 2024 Fine example of redneck engineering. Looks like a pneumatic hammer bit...kind of sorta. .40 Cal, Gerald and Grandpadave52 3 Quote
HARO50 Posted February 2, 2024 Author Report Posted February 2, 2024 4 hours ago, HandyDan said: Do you have one to try? Unfortunately, no. 3 hours ago, forty_caliber said: Fine example of redneck engineering. Looks like a pneumatic hammer bit...kind of sorta. .40 What gets me, the square hole had to be there on the original tool. I looked up "WILT", but that was pretty much a dead end. Grandpadave52 and Cal 2 Quote
forty_caliber Posted February 2, 2024 Report Posted February 2, 2024 4 minutes ago, HARO50 said: Unfortunately, no. What gets me, the square hole had to be there on the original tool. I looked up "WILT", but that was pretty much a dead end. I think the Wilt is for Wilton. The square hole is likely some kind of centering alignment on what used to be a twist drill. I also noticed that the flutes seem a bit wider than normal... carry away more chips maybe? Cal, Grandpadave52 and HARO50 3 Quote
HandyDan Posted February 2, 2024 Report Posted February 2, 2024 27 minutes ago, HARO50 said: Unfortunately, no. What gets me, the square hole had to be there on the original tool. I looked up "WILT", but that was pretty much a dead end. Tool steel can be annealed, reworked and hardened again. Also there are grind marks on it that most likely wouldn't be on a new tool. Gerald, HARO50, Grandpadave52 and 1 other 4 Quote
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