Deep Face Grooving in 316SST

[Wallaby]

Greetings All, I am looking for an alternate face grooving tool similar to the old Manchester style tools that are pretty rigid and will not chatter. With current set-up, we're achieving 70% yield and are looking for opportunity to improve as quantity demand for part increases.

The feature we are cutting is a .30" wide face groove (15.334" ID x 14.734" OD) by approximately 2.40" depth in 316LSST forged rings.

Currently, we are using a Tungaloy EFPR-5-200500. Tool works okay with shallow groove depths but creates chatter on OD and ID surfaces at deeper depths. We are roughing groove at 300sfm at .004" feed-rate on Doosan M400 Lathe in 6 jaw chuck. Finishing of groove uses same style of blade with 240sfm at .006" on same machine/chuck.

Haven't had much luck with local cutting tool vendors and distributors finding a more robust alternative. Any suggestions on if such an off the shelf tool exists other than what we are using?

 

[guythatbrews]

I'm almost universally disappointed with the local guys. They are my last resort.

That is a bigger, deeper trepan than I've ever cut but I'd look at iscar first. They are my go to for bigger trepan tools.

 

[gregormarwick]

I think the problem is that the depth you require is beyond any off the shelf face groover other than the blade type you are already using. You are also right at the maximum overhang of your Tungaloy bar, so it's no real surprise that you are fighting chatter...

Solid face groovers tend to top out at around 50mm.

The most robust by far face groovers that I have used are in Sandvik's SL70 range, but your depth would be a custom, and hence expensive and long lead time. Nonethess, available.

 

[EmGo]

Greetings All, I am looking for an alternate face grooving tool similar to the old Manchester style tools

That sounds even bigger than any of the Manchesters I saw, but there's supposedly a place making the Manchester lineup. Search here for "Manchester" and you should find it. They were in Ohio, maybe ?

That's a pretty big face groove, I'd be surprised if anyone had a really good off-the-shelf tool. I know a couple custom tool places that do nice work, if you can't find anything else.

 

[Ox]

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[Joe Gwinn]

That sounds even bigger than any of the Manchesters I saw, but there's supposedly a place making the Manchester lineup. Search here for "Manchester" and you should find it. They were in Ohio, maybe ?

That's a pretty big face groove, I'd be surprised if anyone had a really good off-the-shelf tool. I know a couple custom tool places that do nice work, if you can't find anything else.

Yes. What occurs to me is to use a repainting core drill, this being a solid cylinder with a few teeth on the business end a pump to push coolant down the center, with chips and coolant washing out around the outside. I've seen this done on scale, used to core a very large steel rod.

 

[4GSR]

I was thinking of a trepanning tool as Joe Gwinn mentioned but with only one cutting edge and wear pads that support the core drill in the cut. Multiple cutting edges on this type of core drill don't work very good.

 

[EmGo]

I was thinking of a trepanning tool ...

I almost said Hougen Rotabroach, but then noticed the size