Bushings for 30K lift. Order of operations question

[Janderso]

Hey all,
I just finished a turkey sandwich
I have four of these to make. The first one took me way too long.
I don’t work aluminum very often. It took several attempts to figure out which insert, what speed and feed to produce chips rather than a long, sharp, hot curly snake that was coming at me.

At .012” feed per rev. running 625 rpm at .125” I found workable chips.
My insert is a WNMG332. The finish is good For what it is.
I ran a 3/8 pilot then went to my only MT4 taper drill, 1 5/64. Kept the bore to a minimum of time anyway.

I have three more to make, how would you do it.

Thanks for your ideas.

 

[benmychree]

Sometimes it works well to make parts in pairs, back to back, hold onto one then to the other, when finished part them in two and face the big end.
Maybe not the best advice, when you already have one finished, but maybe next time.

 

[Janderso]

Sometimes it works well to make parts in pairs, back to back, hold onto one then to the other, when finished part them in two and face the big end.
Maybe not the best advice, when you already have one finished, but maybe next time.

John, I thought of that but wasn't sure how to hold it in the band saw to part the pair.

 

[benmychree]

John, I thought of that but wasn't sure how to hold it in the band saw to part the pair.

I would use a parting tool in the lathe. My advice was courtesy of an old friend from Kaiser Steel, Harold "shorty" Muller, he used the technique often.

 

[benmychree]

Most bushings made at Kaiser were made of aluminum bronze (Ampco #18) like yellow hard steel not real fun to work with ---

 

[Janderso]

I hesitate parting such a large diameter. Patience wins the day in that areana.
Just about done with number 2. I just need to clean up the edges.
Thanks John!

 

[woodchucker]

what's a 30k lift?

 

[woodchucker]

I hesitate parting such a large diameter. Patience wins the day in that areana.
Just about done with number 2. I just need to clean up the edges.
Thanks John!

nice looking chips..

 

[Ulma Doctor]

Nice Job, Jeff
parting with a big lathe is a lot nicer than parting on a small machine!

 

[Janderso]

nice looking chips..

Some trial and error to finally find the right combination. My aluminum inserts, neutral tool with a sharp positive rake, made long sharp curly strings No matter what feeds and speeds I tried.