My New (Big) Fly Cutter

I think the reason the CMMT inserts cut freer because they have much less contact with the work, but the round insert gives a better finish because the relief angle is gradual and lets off cleaner than a more distinct point. That's the same findings I have found on HSS flycutters for smaller ones I use a 1/8" corner radius and zero rake, and on the larger ones I use a 1/32" corner rad on a RH turning tool profile with about 7* of rake. Flycutters are fussy for sure!

I wonder if you could use the large double flycutter, and have the CMMT do the bulk of the cutting then have the round insert trailing behind maybe 1/8" and set to a .002" cut? That might be cool!
 
Nice ...very nice. Didn't think those arbors would be machinable. Figured they would be hard hard hard. Is it that they are just case hardened, or are you using some magic your holding out on us?............Looks like it makes a very nice finish....can I ask what RPM you turn the big one?
 
Looks nice, I want to make a large one for doing some items, but it is down the list a bit. The mill came with a small one that is working for now, Jut takes several passes for some items. For some reason all these projects just keep making the list longer, Oh well, some times they get shifted based on what I'm needing at the time, Right now I'm going to have to make a knurler in order to finish a project, First I have to decide diamond or straight.
 
rgray said:
Nice ...very nice. Didn't think those arbors would be machinable. Figured they would be hard hard hard. Is it that they are just case hardened, or are you using some magic your holding out on us?............Looks like it makes a very nice finish....can I ask what RPM you turn the big one?
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Thank you. Yeah I didn't think so either. I figured if anything I better buy an import, but it wasn't the crapiest import. I got the Pro Series from ABS Import tools. They're actually pretty nice & I have a few others from them, full electroless nickel plated.

I new it was hardened but figured it was only case hardened & couldn't be that hard. One of my files was able to bite into it. But I had to take small DOCs to bring it down to size, well for my 12X lathe anyway. This made me worry on whether or not I was able to single point it & tap it. As you can see I managed fine, I did use a Kennametal nitirde coated cobalt vanadium tap which tapped it with ease. I had it on hand as that is what I use for Ti 6-4.

For the big one, I had it spinning at about 1200 RPM.
 
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