Harbor Freight 1/4" indexable carbide insert lathe tool set

[timo_gross]

On the decorative bead form tool, how to you go about grinding that accurately into HSS ?
Seems like that would be tricky.
.

I experimented with milling the basic shapes out of HSS. With a carbide endmill and really tiny cuts roughly 1% of the tool diameter it can be done.

Trial of a diy keyway broach. I think the geometry is not really working good. Buying it would have been easier and better. But it was the proof of concept that I can cut features into HSS.

Shaper tool for internal gear cutting. That went relatively well. (not everything is milled, some portions are ground) 6 mm diameter HSS rod as stock.

8 mm gearhob to cut wormwheels. HSS bar single point threaded on the lathe with a modified carbide insert. (I had to make quite a view of them, because the things chip easy) Then milling the flutes with a carbide endmill and touching of with grinding wheel.
It is not perfect (mainly dimensions) but it worked to some extend.

So what should I say? HSS vs Carbide ... both! I could not make a carbide tool with the method. I could not practice the method without carbide tool.

Greetings Timo

p.s. for the radius, "just" drill a hole and grind part of it away. (just: I tried it with the drillpress, ruined a 4 flute endmill and a ball endmill :-( ), a spade drill (made out of the broken endmill) worked.

 

[Richard Hed]

For the longest time I have been trying to find the secret decoder ring for carbide insert codes. I finally asked Google the right question to give me the answer I've been looking for. https://littlemachineshop.com/info/insert_charts.php

That link gives you both the ANSI insert codes, and the ISO codes. Time to go looking for something in a D or V shape code to let me reach into a tighter corner.

Yes, I had to bite the bullet and find that stuff out too. I finally downloaded a nice and comprehensive chart--now where is that?

 

[Richard Hed]

About 20 years ago, I bot a green wheel thimpfking it was the dux quack for grinding carbide. Well, it ground it but not very well as the grinding wheel simply was like sand being thrown everywhere. The wheel ground down too quickly so I have only used it spareingly when I am desperate. I have found that these tyhpe work much better:
https://www.shars.com/catalogsearch...+CBN+Grinding+Wheels&q=diamond+carbid+grinder