Models for grinding HSS Lathe Tools

Might have been. The author had scribed marks on the table as I recall. At the time I didn't have that belt grinder/sander, they are hard to find now. But stumbled across one and bought it.
 
Welcome, Shorton. Not late at all. Much has already been written and there should be enough here to help you grind some tools. If you want to see the models, send a PM to @Z2V to arrange it. Ask any questions you have then give it a shot. If you show us a pic of your tools we'll help you refine them if they need it.
 
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Shorton, if you PM me your contact info I’ll get a set of Mikey’s tool models headed your way. It might take a week or so to get them.
I don’t know how much of the thread you have read so far but the meat and potatoes start on page four. Mikey’s method of grinding tool bits are really easy to follow and result in good cutting tools and a better understanding of how the different angles effect your tool.
Give it a try!!
 
mikey said:
Congrats, and please tell your wife that I had absolutely nothing to do with it - let's blame Jeff, Travis, Dave Harris, DDickey, Twienke and whoever else we can come up with. :D
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Ok guys, I’ll take the blame. I’m sure I was not the first of the bunch to make a belt grinder but I’ve been blamed for so many things for so many years I’ve developed pretty solid shoulders, and a don’t give a crap attitude. LOL

I have a old 8” Craftsman bench grinder I haven’t used since I made the belt grinder.

Ceramic belts are the way to go also

It’s all fun
 
My grinder and I had a little chat today. Threading tools, square tools both with L/R versions. And a knife tool. 36 grit ceramic belt, a quick touch with 150 grit, then honed with diamond cards. They feel very sharp. Planning on trying them out later tonight. Thanks @mikey!

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Looks good! You went to town on that grinder today.

Let us know how they work for you.
 
I got a chance to try some of them out. I did a quick hand facing and turning with the knife and square tools. I needed to radius the square tool a little more, but I got good finish passes and could take deep roughing cuts in 12L14 and 6061. I was also able to do a quick single point thread (3/8-24) which worked great with a couple nuts I had on hand.

I switched to the lower speed range and mostly ran at 250-300 RPM. The only slight issue I had was long stringy chips in aluminum, but I get that with carbide as well and managed to get it under control with speed changes.

Power feed finish passes looked better than the insert tools. The inserts are very sharp though, so I could probably radius those and improve things somewhat.

Overall I think I'll be using these a lot. This batch was ground from the Chinese 50 pack we discussed from ebay a while back.

I need more tool holders. Pffffttt...
 
It takes a while to get used to these tools. Go back and look at the discussion we had with HBilly about testing the tools on his lathe, both roughing and finishing, and see what happens. I also suggest you try grinding a general purpose tool with standard angles you find in the table and compare it to your square tool to see what the differences are. Do the same with your carbide insert tooling so you know what all these tool types can do. Then you can choose the right tool for the job. Good work, Travis!
 
mikey said:
  • Shape: general purpose
  • Relief angles: 15 degrees for side and end
  • Side Rake: 18 degrees
  • Back Rake: 40 degrees
  • Nose Radius: 1/32"
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I want to see if I have understood what I've been reading here.. And re-reading.. :)

To make this, I would start with the basic layout of the square tool, the first two, grinds on the end of the tool would be 15 degrees like the examples. The rake angles would be made by setting the table to 18 degrees, the line on the table to 40 degrees, then grind hanging off the side of the table/belt. Then radius the tip.

Am I close? :)
 
ttabbal said:
Am I close? :)
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No, you're dead on. This is a severe amount of back rake and your hand is close to the belt so be sure to use a push block and concentrate. I do the rake grind in two stages - rough to get close and a bit slower to make sure I stop just as the grind reaches the tip.

You got this, T. You will really like this aluminum cutter.
 
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