Looking at a cnc lathe with a c axis and live milling capabilities

[JimDawson]

Yes much less material. How to attach the the hold down tab without welding?

A light press to slip fit. Once assembled into the tailhousing it can't come apart or even move around.

Here is a better picture of the 7/8 bore of the tube showing the fit of the tab.

 

[alloy]

I like the idea.

The fit needs to be leak proof.

 

[JimDawson]

JB Weld, or #2 Permatex maybe. Or some other sticky stuff that is not silicone.

 

[alloy]

Would the tab hold with just the two narrow sides pressed in?

The top of the tab is open.

 

[JimDawson]

Oh crap, I see now. That tab does not hold the sleeve in place, the tab holds the speedometer gear in place. Maybe a 9 axis horizontal machining center is in your future I need to think about this a bit more.

What holds the sleeve in place?

If I were going to machine that in one piece, I would start with 3'' round bar and machine all of the round parts in the lathe. I would not screw around with trying to do offset turning.

Do all of the 1.125 surfaces in one setup, flip it over and drill & bore as needed. Then over to the mill and machine the tab.

 

[alloy]

It's held in by a single 10x24 bolt and epoxy to seal it up. Yes the tab holds the round speedometer housing and the driven gear in.

The 1-1/4" x 2" x 4" blocks I get for around $8 each in lots of 50. I checked on 3" round 4" long and they are $22 each.

9 axis huh, I can't even envision how that would work, much less fit it in my shop.