Models for grinding HSS Lathe Tools

thanks! I'm getting the feel for it, it's fun! I have a bench grinder, no space for a belt.
 
Tim, I agree with Jeff. It looks like you're off to a good start. However, the views are a bit confusing. Let me try to be more specific.
  • The threading tool view is upside down and we cannot see the upper surface. It looks fine, though, from what I can see and it will work if your tool profile is at exactly 60 degrees.
  • The knife tool's rake surface is not ground all the way to the tip so it will not cut well. You need to grind it until the grind is fully at the tip and no further. It will cut if you do that.
  • The turning tool pic is confusing. It shows the tools from the bottom. This makes it hard to evaluate. Not sure what the scalloped side is meant to do. Also, if the tool to the left of that scalloped tool is also upside down then why is it ground underneath?
I'm probably not seeing the tool the way you intend. Please shoot pics directly from the sides, directly on top and from the tip and we'll go from there.
 
got it. I'll try to in a bit. Many thanks!
Tim
 
Tim, the turning tool and threading tool look pretty good. However, the knife tool needs to be re-done. Go back to page 4, post #104 of this thread and look at how the knife tool is ground.

The first step is to grind the left side of the tool. You are grinding the side relief angle with the tool parallel to the face of your wheel. As you grind that side, it will cut at the lower edge of the blank and as the grind progresses, the ground part will rise toward the top of the tool. Stop just as the ground part reaches the top part of the tool. This creates the side cutting edge.

Second step is to grind the end at about a 65 degree angle.

Third step is to grind the top rake angles, which you already know how to do.

Keep at it. You're doing well! Show us the knife tool when you're done with it.

This tool grinding thing is not hard to do but in the beginning, it takes a bit to learn how to move your hands and get your head around what they're doing. Like almost everyone else here, you're doing a heck of a lot better than I did at your stage of the game.
 
thomas s said:
Nice job it just takes practice and Mikey makes it look easy.
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Thanks, Tom. Yeah, its easy for me now but it wasn't always so. I clearly remember how I started and that keeps me humble. You saw my early tools - I just cannot be arrogant about anything after showing you that!
 
mikey said:
The first step is to grind the left side of the tool. You are grinding the side relief angle with the tool parallel to the face of your wheel.
[/QUOTE When you say "you are grinding" here about the knife tool, do you mean I SHOULD be or did but should NOT be?

Mike,
You're the world's best teacher. Many thanks.
Tim
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Z2V said:
Tim, It looks like you are off to a good start. I’m sure Mickey will stop by soon. Are you using a bench grinder or do you have a belt grinder?
I do not have any members on the waiting list at this time so feel free to hold on to the models.
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Grinding good cutting tools been my current stumbling point of late. Had been trying to use some carbide inserts that I had inherted with varriying results and came to the conclusion that due to the size and power of my equipment HSS would do better and be cheaper.(?) I had expressed an interest in the model/examples some time ago but did not follow up on that... SO... not yet sure that'll need them now, Getting a larger 8" grinder tomorrow, only had a weak little 5" and my results were kind of hit and miss. Good to revist this thread and will be trying more again soon.
 
You should use the models, and I have extra keystock if you want some. So much easier when you read the text AND have the model in your hand.
Tim
 
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