Making half-round steel pieces

Gallery, Projects and General > How do I??

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vtsteam:
I'd probably go with option #1, except maybe I'd tack weld them at the ends, and grind those off after turning.

I'd also probably turn between centers, so center drill first, and maybe even weld a temporary bit of rod as a dog on the end to engage the plate slot

After that I'd rough off the outside corners with a hand grinder to approximately 8-side it before mounting for final turning.

I don't think it would take long to turn something that small which was already roughed out.

shipto:
Is the aim here to end up with something like 4 really oversized woodruff keys? I would probably get 2 bits of 2 1/4" by 4 1/4 bits then face them off to fit nicely together and either bolt or weld them at each end before turning them to round and seperating them which I think is your no1 suggestion.
Sounds by far the quickest and most cost effective solution to me.

mattinker:
How about having them flame cut from 3 1/2 plate?

Regards, Matthew

Lew_Merrick_PE:

--- Quote from: AdeV on July 21, 2015, 07:04:17 PM ---Lew - will acrylic glue survive the heat of machining? I'd assumed the use of cyanoacrylate (superglue), allowing plenty of time to cool the bar after taking a cut.
--- End quote ---

Yes, CA adhesives will survive up to (about) 450°F, but they are brittle and shock adverse. Acrylic adhesives are only good up to (about) 230°F, but they are much less sensitive to shock loads. This is why I also recommended making the entire piece longer and installing screws and dowel pins.

AdeV:
For those wondering what it is I'm making... I'm copying the vice jaws of a Manchester Rapidor hacksaw for a couple of guys on another forum. The half rounds are 3 1/2" tall, and rotate within a backstop, and allow you to set the saw to cut at +/- 45 degrees from "straight ahead". They're held in place by a single large bolt, there's a curved slot cut in them which allows them to be rotated.

You can probably see what I'm making in this picture, courtesy of the mig-welding.co.uk forum:

Obviously, the originals were cast, presumably the front faced to give a smooth surface, then they'd be glued(?) together and the outer diameters turned to size.

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