#1
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patch help
This is probably a no brainer for all of you in here. But when making a patch panel, do I make the patch fit the hole or the hole fit the patch?
Thank you all in advance
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TJ Ratzlaff |
#2
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I'd say a bit of both.
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Ray R |
#3
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And no square corners.
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Dave Bradbury |
#4
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Which ever is easier to do.
The patch is able too be worked on at a bench or in a vice, or claimed to the bench. Good light and a comfortable working position makes trimming accurately much easier. If the patch is small or hard to hold, then place it over the panel, scribe a line tight to the patch edge. Snip, grind, sand or file, to get the best fit possible. Time spent on good fit up will make the welding go much better and quicker. Also less welding heat will cause less warpage, which means less panel finishing. Steve
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Steve Hamilton Hamilton Classics Auto Restoration & Metalshaping |
#5
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sometimes the panel is in a darkened location making it hard to see or awkward location, etc where I prefer initial cut there and final cut on the patch where you can move to better lighting, rotate the smaller patch around for an easier cut to get a more precise fit. Here’s a sample of what we did on the hood in the shop now, shows a bit of the marking and trimming.
Quote:
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Robert Instagram @ mccartney_paint_and_custom McCartney Paint and Custom YouTube channel |
#6
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Very good explanation Robert.
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Phil |
#7
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If the hole is somewhere that will not allow access to the back side of the weld, and enlarging the patch by an inch will allow access, adjust hole then make patch to fit.
One other way I have found to get precise fit is to lay patch behind hole and hit it lightly with spray paint. That eliminates line width of a marking tool but the patch must fit contours well.
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Matt |
#8
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Thank you all for the great info. Much appreciated.
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TJ Ratzlaff |
#9
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Another tip I read if no access behind is to raise HAZ area up some before welding. Antone doing this?
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Phil |
#10
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Ditto in other shops - tack all - then hammer HAZ, skip weld, hammer that, skip weld, hammer, weld, hammer... done. Keeps it flat and in control all the way.
P1120267 copy.jpg P1120245 copy.jpg P1120260 copy.jpg straightedge used to check flatness old school
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Kent http://www.tinmantech.com "All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919. |
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