Ray at Explorer PS in Santa Fe Springs, CA found this thread and contacted me with a sample of their Lexsoap powdered hand soap - I found it cut grease better than Boraxo.
FredC wrote
“On your C10 copies, the radius reliefs maybe for limited contact to enhance squareness when tightening the tools? Or the guy building them may have been quirky”
Two good thoughts.
I always thought the unmarked holders I have were aftermarket and the only purpose I could ever think of was ease of broaching - if that was the way that rectangle was cut?
I have other unmarked with straight sides. The Quality and hardness are same as Hardinge.
I misread your second sentence when I responded: “Yes you are correct”
Should have replied: Not true from my experience, it clamps very tight. I’ve never had it slip and I usually take heavy cuts on 4140 and 4340
Yes insert tools are great and I use them most of the time but a few times a year when I need a special shape I can grind a tool bit immediately without having to order and wait days to finish a job.
I love McMaster, my shop is 15 minutes from the LA McMaster however recently I needed two sight glasses so of course I checked McMaster No Luck!
I think most of us ”professionals“ go wherever needed to find what we need.
This is what my friend uses: It is a Beseler slide duplicator with a digital camera mounted to it. It can shoot 35mm up to 6 x 7 cm film negatives and transparencies.
If you don’t want to get this fancy all you need is a copy stand, 100 macro lens and a light box that is 5500 or 5000 kelvin...
I have 3 Waldes Truarc Grooving Tools - anyone remember those? - I bought one around 1980, $500 - $600 and needed another in the 1990s they were $1200 - $1300. I check eBay occasionally
and see no evidence of them selling.
This 29.5 degree discussion always reminds me of high school shop class!
I’ve been single point thread cutting of many sizes and materials for 50+ years and never waste my time with this, there are more important details to focus on.
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