Flycutter carbide tool holder

[Lee250]

I just got a 2.5" flycutter to play with and I happen to have a bunch of tng322 and tpg 322 inserts laying around and was wondering if there's a tool holder that will work in the flycutter, takes a 3/8 tool, that will use either of those inserts. I tried Google and I guess those size inserts are about 3/8 or something because that's pretty much all that comes up when searching is just the inserts and not the tool holders.

 

[davidpbest]

Good luck with that search. I'm not sure such an animal exists. A TxGx332 insert has a 3/8" inscribed circle which defines the overall dimension of the insert. When you say your fly cutter takes a "3/8 tool", I assume you mean a 3/8" square shanked tool. Typically a 3/8" square-indexable tool holder will accept a 1/4" inscribed circle insert or smaller.

 

[Eddyde]

Usually for flycutters I use HSS or brazed carbide tools.

 

[pontiac428]

Fly cutters almost always are making interrupted cuts. In light of this, I only use HSS. Works well.

 

[Lee250]

I'll get some HSS tools then. I figured I would try since I have a bunch of the carbide inserts. Thanks. Another question I have is the fly cutter is 2.5" so how big of a tool do I need for it? Like how far can/should it stick out from the cutter on both ends?

 

[Janderso]

I made this a week ago.
Works great.
I haven't tried it on steel yet. Interrupted cut in steel may be a problem with this insert. Time will tell.
I have HSS as a backup.

 

[Janderso]

I'll get some HSS tools then. I figured I would try since I have a bunch of the carbide inserts. Thanks. Another question I have is the fly cutter is 2.5" so how big of a tool do I need for it? Like how far can/should it stick out from the cutter on both ends?

The rigidity of your machine dictates what you can get away with.
That’s been my experience.
The flycutter I made has a .750” arbor, with a 5/8” insert tool.

 

[great white]

I use some old unused brazed carbide in mine. Lots of “extras” rolling around in the bottom of the drawer, so might as well use them up.

I started with hss, but found it dulled far too quickly in fly cutter operations for my liking.

Been using a brazed carbide for a fair bit now and still cuts steel like the day I installed it.

YMMV…

 

[Lee250]

I got an R8 flycutter so it chucks right up in my mill and I have a benchtop pm30mv precision Matthews mill. So I'm going to guess it probably can't stick out too far.

 

[Cadillac]

You only want as much stick out to cover your part. The more stick out means more chances of chatter. Only as much as needed.