Results 1 to 13 of 13

Thread: Moving a radius on sheet metal patch

Discussions of Triumph motor cars

  1. #1
    Member
    Join Date
    Sep 2004
    Location
    PA, USA
    Posts
    37
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Moving a radius on sheet metal patch

    Hello- I’m restoring a 59 TR3A and am doing some major repair of the rear valence. I purchased a “rear valence repair panel” whose quality leaves a little to be desired. One of the major issues is the taillight boss is quite a bit off and I need to move the edge over about a 1/4” to be symmetrical with the boss on the left rear wing. While I have pretty good sheet metal skills, the compound radii are turning this into quite a challenge and I don’t want to bodge this. I thought about making a wood form, clamping the metal to it and working the radius over with a hammer but thought I’d post for other ideas.

    Does anyone have any suggestions on how to do this?

    Thanks

  2. #2
    Jedi Knight Got_All_4's Avatar
    Join Date
    Dec 2004
    Location
    NEOHIO
    Posts
    1,486
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Re: Moving a radius on sheet metal patch

    Pics would help. Can you cut out the boss at the bottom and move it over then fill in the "flatter" panel.

  3. #3
    Member
    Join Date
    Sep 2004
    Location
    PA, USA
    Posts
    37
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Re: Moving a radius on sheet metal patch

    Here is the image of what I'm dealing with...
    Attached Images Attached Images

  4. #4
    Darth Vader
    Join Date
    Nov 2004
    Location
    washington state
    Posts
    2,934
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    10
    Thanked in
    10 Posts

    Re: Moving a radius on sheet metal patch

    Heck the rubber pad, bezel, and light do not fit that good; you would not see that unless you knew. I had a lot of difficulty around the other edge where it goes up, out, and around maybe mostly because I was learning body work and mine was pushed is from the bumpers on both sides. But heck hey that is a difficult area.

    But I guess if it is that bad why not straighten the folds cut it in and 1/8 to a ¼ and refold it to slid it over some.

  5. #5
    Yoda CJD's Avatar
    Join Date
    Feb 2011
    Location
    Southlake, TX, USA
    Posts
    5,007
    Thanks Thanks Given 
    4
    Thanks Thanks Received 
    18
    Thanked in
    18 Posts

    Re: Moving a radius on sheet metal patch

    I'm with Steve. They were about like you have right out of the factory. The rubber gasket hides a lot of that "over-size" you have. You can work hard to make it perfect, but realize that will actually be better than it was when original.

    That said, if you want it better, I would simply heat the area and tap to shape with a properly shaped dolly behind to shape the edge. The wood form would also work, but you have to find a way to anchor the form securely as you work around it with the hammer.
    John

    1955 TR2

  6. #6
    Senior Member
    Join Date
    May 2012
    Location
    Robbinsville, NC; Everglades City, Fl
    Posts
    589
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    4
    Thanked in
    4 Posts

    Re: Moving a radius on sheet metal patch

    You'v already heard from some better body and fender guys than I am, but since you are already working with a patch I would look at removing some material from the left side of the patch to move the whole thing to the left. It would be easier to move the straight bends where the patch meets the fenders than to move that rounded contour,
    Bob

  7. #7
    Jedi Knight Got_All_4's Avatar
    Join Date
    Dec 2004
    Location
    NEOHIO
    Posts
    1,486
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Re: Moving a radius on sheet metal patch

    I'm with Bob. I had the wrong light on my 1st suggestion. Looks like you can trim off a little on the left and move it over. You could split the difference but I'd take the rubber pad and the tail light mount them both and trace the outline of the rubber pad then trim to how you want it to look. Considering that you are doing the same thing to the other side. If not then you would want to match it.

  8. #8
    Member
    Join Date
    Aug 2018
    Location
    Nashville, TN
    Posts
    47
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    1
    Thanked in
    1 Post

    Re: Moving a radius on sheet metal patch

    Another vote for Bob's suggestion. That is a lot of metal to shrink to move the light edge 1/4". I to would cut the left edge move the patch over and work the softer curve of the patch to match the existing rear valance. once you start trying to move the hard edge of the light you will be chasing metal all over the patch. If you don't shrink the metal as you move the edge it will go where it wants to, not where you need it to go. Not impossible but slow and difficult. much easier to move the patch over.
    Frank

  9. #9
    Senior Member
    Join Date
    Jul 2018
    Location
    Perth Australia
    Posts
    110
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Re: Moving a radius on sheet metal patch

    I'm with the "define the new line with hammer and dolly and work the existing line back into the curve" camp. Had to do this with one of the tail lights on my panel. Used a sharp edged round dolly to hammer in the line first. This locks the metal somewhat and then allows you to gently work the old line back into the curve. As John says, if you have an oxy, then heat will allow the metal to move more easily. I did mine cold as I don't have oxy acetylene in the shed.
    I think if you try to move the whole thing accross, as you move the middle part out, it will try to move the upper and lower section further up and down respectively.
    Always more than one way to skin a cat though!

  10. #10
    Member
    Join Date
    Sep 2004
    Location
    PA, USA
    Posts
    37
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Re: Moving a radius on sheet metal patch

    Well, I spent some time today and made a hammer form to move the radius. The profile matched the trunk lid perfectly and if I would have shifted it, the profile would have been off. The hammer form was the way to go. I took a piece of scrap walnut and using the taillight housing, made a line 1/8" out from the housing on the walnut. A bandsaw cut and some light sanding to put a 1/16" radius on the edges and I had a form. I screwed the patch to the form and gradually moved the existing radius over. It really wasn't that bad. I had to do a little shrinking, stretching and hammering to take care of a little warping but that was it.

    Thanks to everyone for the suggestions.
    Attached Images Attached Images

  11. #11
    Senior Member
    Join Date
    Jul 2018
    Location
    Perth Australia
    Posts
    110
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Re: Moving a radius on sheet metal patch

    Beautiful job! Well done for following through and the update.

  12. #12
    Yoda CJD's Avatar
    Join Date
    Feb 2011
    Location
    Southlake, TX, USA
    Posts
    5,007
    Thanks Thanks Given 
    4
    Thanks Thanks Received 
    18
    Thanked in
    18 Posts

    Re: Moving a radius on sheet metal patch

    Very nice!
    John

    1955 TR2

  13. #13
    Luke Skywalker
    Join Date
    Feb 2016
    Location
    Macon Georgia
    Posts
    1,999
    Thanks Thanks Given 
    8
    Thanks Thanks Received 
    17
    Thanked in
    15 Posts

    Re: Moving a radius on sheet metal patch

    Nice work there.

    David
    TR3A TS75524L

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •