Deep, Flat-Bottom Bore

[The Cathedral]

I need to put a flat-bottom bore into a part. The bore is 1.40" in diameter, 11.00" deep in 304 stainless, and needs to be a 63 micro. This will be done on a Multus.

 

Any ideas?

 

Right now I'm thinking, rough drill with an indexable inserted drill, and then finish by doing a helix bore with a long indexable tip endmill. I can imagine the cycle time on that is going to be extreme and keeping the surface finish will be a struggle.

 

Can EDM do things like that? I have to be honest, I have no idea what the capabilites of EDM are.

 

Thanks in advance.

[jlw™]

I don't know what the budget allows but check out the Iscar multimaster tools. They run great in my experience and something like you're describing is exactly where I've used them.

[THEE THAINZ™]

Capto tool holders for length. Iscar makes some good stuff, also look at Walter. They have a good line up of indexable and screw fit endmills.

[The Cathedral]

I don't know what the budget allows but check out the Iscar multimaster tools. They run great in my experience and something like you're describing is exactly where I've used them.

 

That's what I was planning on using. We have one with a massive solid carbide shank extender. I know how expensive they are because five years ago I was deep hole milling in aluminum and it got caught in a harmonic vibration and snapped it before I could even crap my pants. That's probably the way I'm headed, I was just looking for some other options.

[jeff]

Look into the Silent series of tools from Sandvik. Even then a bore that size and that deep is going to be difficult no matter what you use.

Good luck!

[Del.]

EDM would be no problem to finish out the bottom.

[jlw™]

Add to my above statement I prefer to run a Gen2 TA flat bottom.