Cutting small groove on the lathe ??...

You're right; the relief angle is the angle underneath the cutting edge. That angle that increases from left to right can be ground off so the front is flat with no angle. Then you just need to thin it a little and again, I would just thin it from the right side with a diamond stone.
 
I use the Nikcole Mini-System tools for small grooves, parting thin wall tubing and fine pitch threading . They have grooving inserts from .019" to .073".

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ive seen hacksaw blades mounted to a piece of steel (keystock) used to cut grooves. the thin hacksaw blades cant be used to move back and forth to clean up the bottom but you might have a larger power hacksaw blade. anything that is made of hss and can be mounted to your lathe will work. make sure you use the teeth side of the blade. ( newer blades are weld edge and the back side is just carbon steel and wont work. you could even use an old file ground on the front to what you need and mount it somehow on your lathe and cut your groove. go slow though files are high carbon steel and wont take the heat. any thing that will cut steel will work. bill
 
Actually been making some progress on this,though rather slowly as I'm taking my time and trying not to rush/break anything. Seems to be coming along good just discovering more tools/accessories I could use to make the job easier (like a carriage stop). Still need to drill it to the final bore dimension & thread it 14x1mm LH (have a tap for that). Then cut the flange the muzzle device locking pin will engage once the flange is notched like the in the pic...

 
bfd said:
ive seen hacksaw blades mounted to a piece of steel (keystock) used to cut grooves. the thin hacksaw blades cant be used to move back and forth to clean up the bottom but you might have a larger power hacksaw blade. anything that is made of hss and can be mounted to your lathe will work. make sure you use the teeth side of the blade. ( newer blades are weld edge and the back side is just carbon steel and wont work. you could even use an old file ground on the front to what you need and mount it somehow on your lathe and cut your groove. go slow though files are high carbon steel and wont take the heat. any thing that will cut steel will work. bill
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Thanks...I've been thinking of using something similar for parting. Just need to make a bracket that will hold a spring to keep tension on the blade to keep it cutting.
 
you keep tension on the blade to keep it cutting by feeding the cross slide forward as the tool cuts keep cutting fluid on it and keep it feeding toward the stock. you don't need a spring. maybe I just don't understand what you are saying bill
 
Here's a video I believe was posted by another member show the set-up I was referring to...
 
I saw that and thought it was for cutting off parts could work to cut grooves what I'm talking about is cutting a short piece of hacksaw blade off the end and machine a piece ok keystock to allow the hacksaw blade to sit in the groove set the hole in the blade to screw it to the keystock then sharpen the end like a square nose parting tool and use it to cut the groove it will be better if you could find a used industrial power hacksaw blade its thicker and would therefore be stiffer. bill
 
There is a wright up on here some where they cut cutoff blades from carbide tipped circular saw blades.
 
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