O/T:IN SEARCH OF BIG TOOLING!!!!!

[RStuart]

Okay, sorry to yell guys but as usual I have to make a part and they will not buy me the tooling I need to do it productively. Difference is this time I cannot find a tool anywhere. Maybe you guys can help me. I need an Internal grooving tool with an inch, yes 1" of overhang and no bigger than a 3" shank. Would prefer no smaller than a 3" shank also. Any ideas guys? Without having one made.

[jeff]

Cut a part-off blade in half and weld it to the end of a shaft.

we did this when we had to put in an id groove that was 2" deep per side.

Wuhoo! what fun.

[RStuart]

Ah yes that would work.Had thought of that. But unfortunately I need to turn with it. I guess I should have mentioned that. Not sure if that trick would be rigid enough. Cutting stainless and it needs to reach 4.75"deep. Guess I should have mentioned that too. The part is basically a hollowed out sphere with a hole through the center.

[Harryman]

Check out Iskar, maybe a square shank tool with short chunk of cut off blade.

[RStuart]

I guess its worth a try. Wanted to stay away from that but if there is nothing out there then I guess I have no choice. Thanks.

[crazy^millman]

I made my own for this at a shop years ago. I took a piece of 5" 4150 HT and made us a external internal boring/turning bar. We use to take out the gap and turn 38"od SS rings on a 30" lathe that where 2.5 tall. We would mount regular tools in that and we had the ability to extend it out 40" if need be for those hard to reach places. I am thinking 2 regular straight mount groove tools a left and right tool so you can go at one side and keep rigidity on the tool and then the other side to get the best finish possible.

 

HTH

[jeff]

Also try attatching a VNMG neutral tool to the end of a bar.

We have done a job similar to what you describe and it worked.

[Scott Bond]

We bought a big boreing bar, and its mount for our lathe. Then we cut a knoch in the end and put in set screws. This alows several store bought tools to fit,,,and you can adjust the depth by moveing the tool. Our cuts are 12.5 deep 1.625 step.