Jean

Yes, i have been following....I fear the part is to big for my machine.
That large tapered center bore has me spooked. You could only fit a 1"
boring bar, 10" deep, a 10 to 1 ratio is real tough especially with the
undercut taper....My machine travel is  20".  The length of the part
plus the room to feed the bar and drill well over 20".  The boring bar
has an insert that protrudes 90degrees. That reduces the clearance to
feed in and not crash the corner where the taper drops in...... I could
possibly drill out a big chunk on the VMC with a 1.5" drill..  That
would still leave the inner profile on the lathe, tight,blind and
dangerous with a crap finish because of the vibration of the long thin
boring bar no matter how many passes.That could set up stress risers
internally..
Man, I would really like to help but this part may be unmake-able as a
pure machine piece.....Is this a copy of an existing design because it
is sooooo long.......?????  Maybe somehow breaking it into 2 pieces
would be more doable.....?????

jeff



Paul
This is you had on your mind about the plug?

Jean Prudhomme

Yes but perhaps a bit shorter. Not as long.

It takes a really big lathe to make stuff like this.
I agree with Jeff. It does not need to be longer than
a Lycoming bearing shell.

I have a guy in SZP that can cut it for you.
You may have to buy a large drill.

I'll try to take some pictures of his equipment today.

Paul Lamar


Jeff

How about using a (shell?) mill on the VMC after drilling?
Small cuts will increase the time but maybe doable?

Dan F