The 3/4 flat plate the vice is mounted on is a scrapyard piece into which I tapped a pattern of 3/8 x 16 holes. The vertical axis is provided by the original compound slide that came with the lathe. (G4003G). The angle plate that attaches the unit to the cross slide is from CDCO. (bout $40 I think.) Below is a picture of the back side.
I was originally going to use the webbed plate but when I laid out my bolt patterns the webs were denying me access to areas I needed so I went with the unwebbed plate. It worked out fine. The angle plate is 3/4 inch thick is not flexing at all as far as I can tell. The most aggressive cut I've made was on a piece of 3/4 bar stock. I thinned it with a pass a full 3/4 wide by .100 DOC. I could hear some vibration and feel it slightly on the top of the unit but I couldn't see anything moving. The finish on the piece was good, the dimension accurate and the 3/4 end mill was still sharp. I'm calling that the max capacity of the unit. Cuts less aggressive than that are smooth as glass so I haven't felt the need to make the xslide gibs any tighter when milling vs when I'm turning. The downside to milling on the lathe is visibility. Everything is happening sideways and the milling operation is sandwiched between the headstock and the milling attachment. It's no where near as good as a real milling machine but for me it's this or nothing. It's a whole lot better than nothing.
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