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From: Richard Smith <null@void.com>
Newsgroups: rec.crafts.metalworking
Subject: Re: FWIW first welding job, 2 years on
Date: Wed, 11 Dec 2024 06:35:58 +0000
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"Jim Wilkins" <muratlanne@gmail.com> writes:

> "Richard Smith"  wrote in message news:m1a5d7bsh1.fsf@void.com...
>
> I have contributed - this has started to happen.  I used "the bubble"
> (spirit-level) on some fabrications, and found that what it cost in time
> to set things off parallel at the first stage was more than made-up for
> by the "ideal" time it took to fit-up and weld the rest.
> Show the approach and the corrections, the owner and designer where on
> the press-brake with dial-gauges, etc., and made adjustments.
> ie. there is something positive going on. ...
> -------------------------
> Could you expand on that?
>
> I found out the hard way how much welds can distort a precise
> alignment, especially a weld across an inside corner. I had to jack
> the sawmill ladder frame parallel (enough) and mill the shrunken gap
> in a bending brake hinge assembled from surface-ground plates. The
> surface welds along the sides of the plate stack didn't destroy the
> 0.005" fork/tongue clearance, but welding inside the fork did.
>
> Do diagonal or fish mouth/tail ends (vs square) improve stress
> distribution and/or reduce distortion in butt joint splice plate
> welds? One end of the splice plate would be bolted, the other welded
> after aligning the beams.
>
> When I was building custom machinery the press brake operator and
> welder compensated for distortion, the all-welded machine frames were
> square to 1/32". They were mostly multiple 19" relay racks that we had
> to fit the equipment panels into, so we would see any error. I knew
> they marked the prints with allowances for bending and welding but
> they didn't share, and the front surface welds had been ground and
> filled as invisible as auto body repairs.
> tia, jsw

You are well ahead of me.  i doubt i can help.

Press-brake - they have a press-brake, yes - good.
Not new when bought.  Is small "fabco.".
Seeing if corrections / calibrations needed to go in to the settings, I think.