Gallery, Projects and General > How do I??

Making half-round steel pieces

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DavidA:
Ade,

Just get your supplier to cut a length off the stock and then ask a local engineering firm to slice it down the middle with a band saw.

The company I worked for had a parallel bandsaw that would cut up to a foot thick with ease.
On the usual 'pivoted at one end ' saws we cut pipes up to 24 inch diameter on a regular basis. The trick is to keep the blade feed rate down so it doesn't wander off.

John Wilson (steel), Keighley will supply and cut the stuff a you want it.

Dave.

p.s.
It may be cheaper to buy 4" bar and then split it off-centre. Then cut the slightly more than half diameter  sections to length and mill to exact 1/2 diameter .
You will,  of course, need twice the length using this meth0d. But it may be cheaper than buying over size bar.

Lew_Merrick_PE:
Ade,

You do not need a perfect half cylinder for your vise.  So long as the two pieces are (reasonably close to being) the same thickness from the pivot face, it will work just fine.  If you cannot cut the ø4 inch bar accurately with your (existing) power hacksaw, then there is almost certainly somebody within a reasonable distance who can cut it for you.  Then it is only a case of mounting the two pieces together with an appropriate shim using screws and dowels (or roll pins) in the excess, turning the OD as required, and cutting to actual length.  ???

shipto:
ok now i know what your making I have a suggestion. What about taking a bit of 4" X 3.5" X 3/8" plate a bit of 3" thick wall tube and a bit of 4" thick wall tube and arrange them as in the pic. You could fill the gap in the smaller tube then machine it all to make it pretty.

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