Can't use those for cutting the shoulders of the wrap groove before leather or linen install. You might be able to, but the right insert does so much better . The fun is in the discovery.It's difficult to go out on a limb since most inserts are made for metal working.
That said, i sometimes use the inserts and bars from my Borite boring bar set.
1/64" tip radius, 11 deg pos rake angle. Again, i typically just mount up one of my boring bars when needed.
IME, borite inserts won't fit other bars, but i have not really explored that.
Borite does make regular turning bar holders, which i intend to order but have not done so yet.
Have a couple decades experience with the boring bars in metal & some wood, none with the regular turning sticks, yet.
Borite sells sets of 5 sticks (holders), too. If you need more than 3 shapes, probably a good deal.
Think i've seen individual 3/8" borite sticks as low as $25 or so. KBC is a good dealer for machine tooling, but you can do your own shopping for cheaper. TT221 pricing is all over the map, too. IMO you don't need TiN coating for wood, so save a buck or 2 by using uncoated inserts.
Honestly, though i use 5/16" square M2 HSS for most wood turning, and grind & hone the tip to suit the app. Can't get any sharper. Can't get any cheaper. You do have to learn to hone as necessary; and reshape/re-grind when needed.
Can't use those for cutting the shoulders of the wrap groove before leather or linen install. You might be able to, but the right insert does so much better
I'll defer to experience.
OP asked about inserts. Assume he'll choose stick holders to suit app.
You highlighted 2 phrases of my response.
The HSS tools can be ground & honed to do anything.
We'd probably all be interested to see pix of the inserts that make your eyes pop.
One of the plastics type? With the big coved sides and sharp point?
Some good choices for anyone who doesn't grind their own. I don't use them because they have no other app. in my shop that can't be addressed with HSS tools.
I'm wondering why you think you need sharper points?I would like to find some carbide inserts with sharper points anybody know of a place. Mine have to much radius. 1/4 inch tool.
Thanks for the help I have a tool grinder.I was just looking for more options because the carbide inserts I have are not pointed enough for shoulders. I guess hss is the best for me, thanks.
Looks like TCGT inserts.
You'll be hard pressed to get a better cut with anything for the work we are doing. This is on a piece of BE maple. If it's cutting this good on maple you can only imagine how ebony or a dalbergia will shave off.
Granted, I have some custom grinds in 5% cobalt blanks for specific profiles but I only wish I had I had all the hours back standing in front of grinding wheel making facing and tenon cutters.
If you feel you would need a sharper inside corner, a single edge razor blade would do the trick in about 5-10 seconds. But in my experience that inside corner is well enough for either linen or leather in a wrap channel.
This particular insert has about a month of cutting on the same point and is still going strong. Phenolic will make you change out more often but they'll last a long time in wood.
These are inexpensive Korloy inserts that can be had for $1-1.25ea if you have good shopping skills. :wink: