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lathe tool for trepanning or face cutting/grooving
- Thread starter Mutt
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- Dec 20, 2012
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- 9,422
Yup, works good, too.
Mutt, a HSS knife tool will do this sort of thing easily. Simple to grind, simple to use, works good for exactly what you are describing
So do ya got a picture of one of these? A knife blade to me is like a parting tool. Seems like the bottom 90% of the blade would be right in the way. Even with a small square bit, the bottom of the square would get right in the way.
Remember our model tools thread? It was one of the tools in the set.
I didn't see this article, do you have a link to it?
So do ya got a picture of one of these? A knife blade to me is like a parting tool. Seems like the bottom 90% of the blade would be right in the way. Even with a small square bit, the bottom of the square would get right in the way.
Remember our model tools thread? It was one of the tools in the set.
I didn't see this article, do you have a link to it?
Here ya go! (it's the first "sticky" post at top of page in Beginners Forum)
https://www.hobby-machinist.com/threads/models-for-grinding-hss-lathe-tools.62111/
It's a long thread @ 17 pages, but the information found within is priceless for us newbie's learning to grind our own tools.
Knife tool geometry found roughly 1/2 way down page 4....
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Thanks for the link. I found the page with the knife tool on it. I'll look thru the little pile of HHS tool bits I have and see if any are similar to this. If not, maybe I can send a piece of this stuff to someone and pay them to grind it for me? I don't have anything to grind tools like Mikey has (yet) but I plan to.
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Sure, the fancy grinders are nice but all you really need is a basic bench grinder. I highly recommend learning to grind HSS tools, it will open up a new dimension of possibilities and it's really not hard to do.
- Joined
- Dec 20, 2012
- Messages
- 9,422
Sorry, I should have put a link or pic up - my fault.
What you need to do is a simple facing operation except you're leaving a rim. Any tool that can face can do this job and since the primary function of a knife tool is facing, it works well for this sort of thing provided the hole is not too deep. If it is, then a boring bar is the right tool for the job. The knife tool has enough relief angle up front to clear most shallow bores and should not rub. I've done this sort of thing numerous times so I know it works.
What kind of lathe are you working with? What, specifically, are you trying to accomplish? Do you own a grinder of some sort? Happy to help but we sort of need to know what we're dealing with.