Best way to mill 13" hole 6.5" deep in 4140

[MaxPrairie]

My point was the machine he wants too use is to small to do the job in a profitable manner, and whats the point if you do not have a gain, just sub it out to a shop that has open time and the right machine , or better yet buy a lathe and have it for next time if it has to be done in house...Phil

Guy shows up an hour and a half late to the party and is wondering why the keg is already tapped...

 

[mhajicek]

My point was the machine he wants too use is to small to do the job in a profitable manner, and whats the point if you do not have a gain, just sub it out to a shop that has open time and the right machine , or better yet buy a lathe and have it for next time if it has to be done in house...Phil

And how many weeks or months would that take? Sometimes you just gotta git'er done.

 

[wesg]

Yeah, sorry, I guess I shouldn't have called it a counterbore. Instead, it is a flat bottom hole. No thru hole on this particular part.

So, technically, a spotface.

 

[AARONT]

So, technically, a spotface.

Technically a pocket...

 

[dandrummerman21]

Technically a pocket...

Technically a hole...

 

[Mtndew]

Technically a hole...

Technically a blind hole.

 

[TeachMePlease]

Technically a blind hole.

Technically a debossed '0' or 'O'.

 

[reckmann73]

On some deep ph17-4 parts I helical interpolated a Walter feed mill down 3.5". It would make chips faster than the through spindle air could get out. I used a Toro electric leaf blower to blow the chips out. Worked like a charm.

 

[dandrummerman21]

On some deep ph17-4 parts I helical interpolated a Walter feed mill down 3.5". It would make chips faster than the through spindle air could get out. I used a Toro electric leaf blower to blow the chips out. Worked like a charm.

I love this idea. I might bring mine in next time.

 

[kuchkuchh231]

I have thru-spindle air but sometimes it's not enough on deeper pockets like this, or with heavy chips. I've found an external air line rigged up to a mag base has helped enough to get the chips out. Got that suggestion from somebody here actually. Worked well enough.

 

[kuchkuchh231]

I guess I shouldn't have called it a counterbore. Instead, it is a flat bottom hole.

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