david n
Diamond
- Joined
- Apr 13, 2007
- Location
- Pillager, MN
Yeh Hoo! My Latest Shop Made Tooling
Well, I've been running these horrid little forgings for about 3yrs, 1500-2000/year. They suck. Really suck. I hate them. And the first OP was always a real pain to get a nice uniform diameter for the next two OPs. Stand them vertical, hold onto a small little tang, listen to them squeal and chatter, and hope for the best. Did I mention I hate these parts?
When I started these, my customer supplied the first hollow mill. It worked....barely. It was made for the Bridgeport and used brazed carbide turning tools. I used it for the intial run of these parts and with furry and frustrastion chucked it in the scrap bin and made myself my own hollow mill that used those inexpensive indexible toolholders with the TPG style inserts. It worked a little better, but with the interupted cut, lack or rigidity on the Bridgy, the screw on inserts just got beat to heck. So here is phase three:
Shameless MariTool plug.
Got myself some lefthand 80° insert turning toolholders, a hunk of spare D2 I had laying around, a few hours of crankin handles and here we have the Cadilac of hollow mills. 
She's my baby. Works like a charm, very stable, quiet, and inserts last forever.
Here's an action shot:
And the finished 1st OP:
Worked so darn good, I had myself a beer. (And thought this big 'ol piston and connecting rod was photo worthy too.
) And now back to my 2nd beer. 
Well, I've been running these horrid little forgings for about 3yrs, 1500-2000/year. They suck. Really suck. I hate them. And the first OP was always a real pain to get a nice uniform diameter for the next two OPs. Stand them vertical, hold onto a small little tang, listen to them squeal and chatter, and hope for the best. Did I mention I hate these parts?
When I started these, my customer supplied the first hollow mill. It worked....barely. It was made for the Bridgeport and used brazed carbide turning tools. I used it for the intial run of these parts and with furry and frustrastion chucked it in the scrap bin and made myself my own hollow mill that used those inexpensive indexible toolholders with the TPG style inserts. It worked a little better, but with the interupted cut, lack or rigidity on the Bridgy, the screw on inserts just got beat to heck. So here is phase three:
Shameless MariTool plug.
Got myself some lefthand 80° insert turning toolholders, a hunk of spare D2 I had laying around, a few hours of crankin handles and here we have the Cadilac of hollow mills. She's my baby. Works like a charm, very stable, quiet, and inserts last forever.Here's an action shot:
And the finished 1st OP:
Worked so darn good, I had myself a beer. (And thought this big 'ol piston and connecting rod was photo worthy too.
) And now back to my 2nd beer.
),
