John P
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| posted on 8/5/26 at 04:47 PM |
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Cutting 22mm Mild Steel Bar Lengthwise
Hi,
I need two 200mm lengths of 22mm diameter 1/2 round steel which wants to be as close to a full semi-circle as possible.
Most stockists sell the flattened 1/2 round section used for handrails but I can't use that.
I only have hand tools so am considering cutting a piece of 22mm bar lengthwise to create two half round sections. I don't really fancy
hacksawing it so am thinking of trying to cut it with an angle grinder fitted with a 0.8mm cutting disk but suspect it will be very difficult to make
a straight cut.
I appreciate it could be milled but paying an engineering shop to do so wouldn't really be viable.
Any advice / experience of doing this?
John.
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Slimy38
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| posted on 9/5/26 at 07:07 AM |
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How about something like this;
https://www.youtube.com/watch?v=jpuuDENxYqU
Here it's used to cut a tile at a specific height, but there's no reason why you couldn't do the same for a clamped down piece of
metal? I'd go for maybe a 250mm length, bolted either end then you can cut it to length once the deed is done?
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coyoteboy
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| posted on 9/5/26 at 10:28 PM |
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Honestly I can't think of anything that is accurate and half way sane. And it's probably cheaper to get someone to flat it, for a local
machinist it'll be probably less than the cost of the material to do the job. You can buy half-rounds but not at 22mm, only 20, 25 and 30 IIRC.
https://www.fixmystreet.com/
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nick205
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| posted on 11/5/26 at 08:33 AM |
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John P
For what you're doing/making, does it have to be half Ø22mm?
Could you get away with Ø20mm or Ø25mm?
Could you use Ø20mm and form a skin of something around that to make it Ø22mm?
(Just trying to move around the issue)
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MikeR
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| posted on 12/5/26 at 06:53 AM |
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Or could you get half round at a larger size and then have it turned in a lathe down to 22mm. Do an inch at a time and have a collar to keep the thing
from flapping around and held together at the tail.
Can we ask what it's for as knowing the application may give an alternative idea
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MikeR
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| posted on 12/5/26 at 06:56 AM |
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Could it be tube instead of bar?
22mm tube, 11mm right angle tested against it and draw a line. You now have a perfectly straight guide line. Work out the opposite side and draw
another line.
Now cut the lines. Should be more accurate than trying to do a cut all the way through.
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nick205
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| posted on 12/5/26 at 12:14 PM |
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Could you use (if it's available) half round tube (like gutter) ?
Also (out of curiosity) what are you wanting to make ?
If you can share the goal people might have more solutions.
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John P
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| posted on 12/5/26 at 03:08 PM |
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Actually they are to make the "side irons" which mount the folding windscreen an an Austin Seven Ulster.
Although my car is not original I am trying to make it look as correct as possible.
At the moment I'm thinking I could probably use 26mm section (which appears to be available) and file the sharp edges to a radius thus slightly
reducing the width to be nearer to what would be correct.
The sketch below (not drawn by me) shows what the original section was:
[img]
 
Description
[/img]
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MalP
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| posted on 15/5/26 at 08:37 PM |
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Half round steel
Steel in half round form is readily available.
As a starter look at this website
buymetalonline.co.uk
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coyoteboy
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| posted on 18/5/26 at 12:57 PM |
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quote:
Originally posted by MalP
Steel in half round form is readily available.
As a starter look at this website
buymetalonline.co.uk
We already pointed that out, but it's only readily available in the wrong dimensions 
https://www.fixmystreet.com/
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nick205
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| posted on 22/5/26 at 12:52 PM |
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Does it have to be steel?
Could you get away with brass or another metal / alloy if available in the right size?
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Schrodinger
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| posted on 23/5/26 at 07:51 AM |
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Does you have an engineering workshop nearby who might be able to roll something out for you?
Keith
Aviemore
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jacko
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| posted on 23/5/26 at 04:46 PM |
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At 200mm long I would get my hacksaw out you would cut it in a few minutes
Or cut tube and fill with Liquid Metal
G
555
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