I know that getting a smooth final cut/finish cut is hard.

[jbmauser]

I know it is tool shape and carriage speed (i think). I can't seem to figure out a tool profile to get a smooth finish.

 

[ttabbal]

What's the nose radius on the tool you're working with?

 

[Canus]

Do you have enough radius on your tool tip?

 

[benmychree]

A lubricant is important too, I use magic tap.

 

[tweinke]

Check out this thread. https://www.hobby-machinist.com/threads/models-for-grinding-hss-lathe-tools.62111 . Much good knowledge was shared about HSS lathe tool sharpening especially for those of us with smaller lathes. Its Mikey's take on how to grind a tool but his knowledge and teaching style are wonderful.

 

[mikey]

Hey JB, maybe show us your tool? I bet the guys can get your sorted quickly.

 

[blaser.306]

First and foremost, actually can't believe no one asked what material are you attempting to cut ?

 

[jbmauser]

Thanks all. I spent last night viewing videos on youtube and realize my radius is probably at fault. I need to grind a new tool this morning and apply what I learned and also apply a solvent. I may be back..... thanks again.

 

[GoceKU]

I agree with all the suggestions above, but i've had good luck with a fast feed rate, this requires lots of power from the lathe and good size tool but. I've gotten reflective surface finish with 400rpm and a fast feed but my lathe has 13,5 hp motor, you can try this metod and see if it works for you.

 

[stupoty]

I agree with all the suggestions above, but i've had good luck with a fast feed rate, this requires lots of power from the lathe and good size tool but. I've gotten reflective surface finish with 400rpm and a fast feed but my lathe has 13,5 hp motor, you can try this metod and see if it works for you.

I find cast iron likes a high feed rate.

(13.5hp is a beast of a motor btw)