I've seen others use a cross slide at the wood lathe. I've done a lot of machining of aluminum and brass at the wood lathe with woodturning tools, but free hand. I've also reshaped steel chuck jaws with a Thompson scraper but that was less pleasant. Some possible problems with machining
steel at the wood lathe may be getting the speed low enough to suit, and lubrication. My metal lathe is mounted in a big tray and it always collects oil inside. I shaped the steel jaws on the wood lathe without lubrication. Sharpened the scraper more-or-less like a metal lathe tool bit.
I've also used a metal lathe tool bit with a triangular carbide cutter on the wood lathe to clean up a couple of steel chuck inserts that didn't suit me. Worked fine without lube with the tool bit held by hand. Cleaning up dinged chuck jaws was also easy.
Should be no problem machining aluminum and brass without a cross slide. (All that said, I'd love to find a good cross slide with an adjustable angle.)
Using a cross slide could allow more precision but for the things I usually do don't require precision - sizing with parting tool and calipers and cutting with gouges, skews, and scrapers is sufficient. I've posted pictures of the handle inserts from aluminum, all done with hand-held tools. (I cut rough grooves on purpose in the part that glues into the handle.)
I start with a piece of 6061 aluminum rod cut about 3" long (bought from Online Metals). The only other tool needed for these inserts is a drill press and taps. The set screws are usually too long so I hold them in an allen T-wrench and shorten the at the bench grinder.
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I think I've done three demos so far on turning metals and I know several that make these tool inserts now.
I posted my document here:
I wrote this PFD document for a demo I did on turning metals, primarily aluminum and brass, on a wood lathe with woodturning tools. Relativity easy to do!
For an example I show how I make inserts for lathe tools. The one I show is fairly small but the method is the same for any size.
JKJ
JKJ