Gallery, Projects and General > How do I??
Insert Madness.....Help Please!
vtsteam:
John, cool! :clap:
Bob, thank you kindly for the advice. I'm sure, now that I have probably ordered the right size of insert, that it's going to be quite wrong kind for roughing out the iron sand castings I'm making!
Oh well......
Also, I notice that in this shape and size insert, there doesn't seem to be much available variety for different metals. I have a feeling these won't last long or work well for what I will probably use them for.
I've also read a comment somewhere else that for roughing, cast iron, they actually liked ordinary cobalt lathe tools (Cobalt 8% or M42 HSCo) nearly as well as specialized carbide inserts. That might be the way to go for me.
krv3000:
hi well when I'm ruffing out castings I use brazed tungsten tip tools I don't by them I make my own up my tool holders for the lathe hold 12mm tooling so I get 12mm stock and grind the relief angle on the end then I braze a used tungsten tip of one of the big milling heads at work then with the ad of a green grinding wheel grind it to shape :nrocks:
vtsteam:
Sounds good, Bob. I don't have access to big milling heads for tips, but I suppose I could just order a brazed Ebay lathe tool in C2 and see how well that lasts. I have a few old C6 tools someone gave me, but those chip easily. I think C2 might last better for this. I do have a green wheel.
vtsteam:
Spotted a C2 brazed 3/8" AR lathe tool bit on Amazon for under 3 bucks, so I had to give it a try. Ordered three at that price. I'm curious to see how C2 holds up.
PekkaNF:
--- Quote from: vtsteam on February 17, 2022, 09:34:36 PM ---Spotted a C2 brazed 3/8" AR lathe tool bit on Amazon for under 3 bucks, so I had to give it a try. Ordered three at that price. I'm curious to see how C2 holds up.
--- End quote ---
By looks and description they look very close to tools I have been cleaning up cast iron. They need a little sharppening often. Just a little careful push on bench top grinder with a cheap greengrit or diamond wheel and quick turn to make good radius. Radius is too big if it is bigger than DOC and too small if the breaks way before dulling. keep clearance angles small to support the tip fully. Sounds like you will not be taking grazy cuts, then you don't need all out clearances, just enough to avoid rubbing.
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