Models for grinding HSS Lathe Tools

[Aukai]

Will do, thank you. It's a South bend from Grizzly, and my previously not finished one for the Samchully chuck.

 

[mikey]

I remember having a bit ground specifically for cast iron but I don't know what happened to it. The last plate I cut was done with a Square tool and it worked fine for me. It helps to keep the tool sharp and you may need to touch up the edge at some point. You'll know it needs attention if it starts singing to you.

 

[Aukai]

Like a Thomson bar?

 

[mikey]

I said singing, not crying!

 

[Aukai]

ROTFL, at least I gave it the good old Collage try, and saw some amazing small machine reactions. I still do not know where a .010 deflection comes from on a facing cut that doesn't cut

 

[Aukai]

I would like to use a form tool to make a round groove, this is the basic shape so far, what other geometries does it need?

 

[finsruskw]

I'm still sitting on the models if anyone wants them!
They are in Iowa.

 

[mikey]

Looks good to me, Mike, except the top needs to be honed a bit more. See that bright edge along the rim? That means the relief angles underneath and the top surface are not making a clean intersection. Just hone it until that bright edge is gone and it will be sharp.

Remember that a form tool has a huge area of engagement so you have to run the lathe slower and feed carefully. By that, I mean you need to run really slow and make sure you feed fast enough to keep the tool cutting constantly. As you go deeper, cutting forces increase dramatically because more of the edge in engaged and you may need to slow down even more. Much depends on what you're cutting into but if you get the speed and feed right, it should go okay.

 

[mikey]

I'm still sitting on the models if anyone wants them!
They are in Iowa.

If no takers in a week or so, please contact Jeff to arrange to return them to him. Thanks!

 

[benmychree]

Depending on what tool holder is used, the front clearance looks quite excessive, this could weaken the cutting edge and also cause it to hog in.