.RC.
21st Sep 2016, 09:27 PM
Had to cut a 5mm internal blind keyway in 4140 about 25mm long in a 16mm bore
The cutter is simply a piece of steel I found that already had some HSS brazed onto the end. I had to grind the cutting end to size, of which I did on the surface grinder and also the tool and cutter grinder. The cutting end is square with the shank.
The cutter was then put in the lathe tool post and aligned so it was halfway above and below centre. The workpiece had a line scribed along it's length and some holes drilled, one for the keyway grub screw and another for the end of the slot.
It was put in the lathe and the line aligned with centre height. Then a simple matter of back and forward taking 0.05mm cuts at a time. It cut it quite easily. Was a lot easier then setting it up on the slotter.
I can get better pictures of the cutter in the sunlight if anyone is interested.
The cutter is simply a piece of steel I found that already had some HSS brazed onto the end. I had to grind the cutting end to size, of which I did on the surface grinder and also the tool and cutter grinder. The cutting end is square with the shank.
The cutter was then put in the lathe tool post and aligned so it was halfway above and below centre. The workpiece had a line scribed along it's length and some holes drilled, one for the keyway grub screw and another for the end of the slot.
It was put in the lathe and the line aligned with centre height. Then a simple matter of back and forward taking 0.05mm cuts at a time. It cut it quite easily. Was a lot easier then setting it up on the slotter.
I can get better pictures of the cutter in the sunlight if anyone is interested.