To replace or not to replace: roof skin on 77 Trans an - Page 15 - Hot Rod Forum : Hotrodders Bulletin Board
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  #211 (permalink)  
Old 05-07-2017, 04:38 PM
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See pic.

Did my see correctly that the two circled areas have divots when popped up?

If so, take your slapper and dolly into these zones, and ring the slapper ON the dolly to try and stretch these two divots.

Did you perhaps use a flame to shrink where I drew the circles?

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  #212 (permalink)  
Old 05-07-2017, 04:40 PM
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Yes, I used a flame to shrink there. That's how this whole business started out before the disc. The one bad area (furthest up in ur pic) is the problem area. The others turned out ok with a flame and definitely after the shrinking disc.


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  #213 (permalink)  
Old 05-07-2017, 04:45 PM
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We now need to work one step at a time. DON'T DO ANY MORE SHRINKING.
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  #214 (permalink)  
Old 05-07-2017, 05:04 PM
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To go slapper on dolly, go all around one of those zones that you heat shrunk and see if you can get a wee bit of crown happening.

Then to the other zone.

Just take your time . I use a plastic rule to check to see how things are.
Lay the edge down on an angle and look at the gap below the edge.
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  #215 (permalink)  
Old 05-07-2017, 05:06 PM
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Ok. Are you thinking I have over shrunk? I thought oil canning could only occur with stretching though. Video uploading to drop box as we speak. I'll post soon when it's done. It's only 3min and 14sec, but our internet out here in the country blows. It takes forever to upload stuff, watch Netflix, etc.


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  #216 (permalink)  
Old 05-07-2017, 06:00 PM
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Alright fellas. Here is the "better" video. Let me know right away if it doesn't work. This is now being shared through drop box.

https://www.dropbox.com/s/k6rtuwnc8b...84401.mp4?dl=0



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  #217 (permalink)  
Old 05-07-2017, 06:36 PM
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Those videos help immensely. Uhhhhm... I'm willing to go out on a limb and spew my opinion about how to approach the issues. I do think its slapping time and that little or no more shrinking will be called for. Depends on how the bumping and slapping goes. If I walked up to it, (after buzzing it with 80 or 180 grit, the blotchy surface is killing it for me, making it tough to see) I would start at the farthest place away from the center. That puts us in the left rear quadrant, correct? Resist the urge to tap down that biggest halo over on the passenger side. I believe if you work on the outer part of the driver's rear and can relax that area, then you can move in closer to the center and locate the remainder of the blompy-blomp dent. But, man... as far as level of difficulty, you're stepping pretty high. With proper guidance, maybe you can pull this off but in any shop it would probably get a new roof. I would expect the average entry level bodyman to get hung up on this panel.
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  #218 (permalink)  
Old 05-07-2017, 07:28 PM
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Thanks. I'll look into thay. Here's another assessment of the PS

https://www.dropbox.com/s/zklktyn87g...95613.mp4?dl=0

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  #219 (permalink)  
Old 05-08-2017, 03:36 AM
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Quote:
Originally Posted by idrivejunk View Post
Those videos help immensely. Uhhhhm... I'm willing to go out on a limb and spew my opinion about how to approach the issues. I do think its slapping time and that little or no more shrinking will be called for. Depends on how the bumping and slapping goes. If I walked up to it, (after buzzing it with 80 or 180 grit, the blotchy surface is killing it for me, making it tough to see) I would start at the farthest place away from the center. That puts us in the left rear quadrant, correct? Resist the urge to tap down that biggest halo over on the passenger side. I believe if you work on the outer part of the driver's rear and can relax that area, then you can move in closer to the center and locate the remainder of the blompy-blomp dent. But, man... as far as level of difficulty, you're stepping pretty high. With proper guidance, maybe you can pull this off but in any shop it would probably get a new roof. I would expect the average entry level bodyman to get hung up on this panel.
Entry level get hung up??
I think you might get hung up as well.

I'm not an expert on something this extensive, that's for sure.

IDJ, can you desrcibe where exactly you think he should start stretching?
Not the two lows I circled where he heat shrunk the panel?

BTW, the vids I did just showed like a 5: circle popping in and out and then using the disc and tightening it up.
It was nothing the caliber of this.
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  #220 (permalink)  
Old 05-08-2017, 03:45 AM
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Quote:
Originally Posted by Schroeder View Post
Thanks. I'll look into thay. Here's another assessment of the PS

https://www.dropbox.com/s/zklktyn87g...95613.mp4?dl=0

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Holy mother of Gawd!

Try with the two spots on this video.
Slap on dolly to try to stretch the metal back up.
It will take quite a bit of slapping for the metal to stretch.
Go all around just the area you shrunk.

Leave the big area alone. Get some experience on these two small circles first.
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  #221 (permalink)  
Old 05-08-2017, 04:45 AM
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Well I don't have a warm fuzzy feeling now lol. I appreciate the honesty though. I try to not beat around the bush. Should I just eat it and get s new roof skin? I can still use the a-pillar skins.

If you guys remember, this whole skin repair and separation started because I didn't like that the replacement skins didn't have the a-pillar skins. You had to weld the replacement panel to the a-pillar skin. With the structure behind the skin, this means you will have an undressed weld under the skin's butt weld to the a-pillar skins and above the roof structure. This drives me nuts just thinking of it rusting. Well since then I've pulled my entire skin, so I can weld my a-pillar skins to my roof skin and get on both sides of the weld as the entire piece sits on my table. I'll be out $350-$400 after shipping, but I really do wanna move along. I've been working on this roof for a month now and am not getting anywhere except further behind.

At the same time, I have flaring and other metal shaping and working. I think this is a great exercise in understanding how metal works.

I don't think we've stated what this is. Is this overshrinking? All these areas are around the zones I torched and hit with the shrinking disc.


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  #222 (permalink)  
Old 05-08-2017, 06:26 AM
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Schroeder, yep. See post #3. Put a bullet in it.

Pugsy, you thought I might get hung up filling the 33 roof I recently did also.

The 2nd vid is bigger than I want to d/l with a tablet on hotel WiFi. Anything more specific than my previous response will have to wait until I'm at my PC. But we are beating the crap out of a dead horse here. I was hoping Pugsy's coaching magic could get you somewhere but this is huge and you are a beginner and now you're in a situation that would be a struggle for anyone. Time does have value to the hobbyist, as I suspected. I gotta run fix old cars now... for a living.
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  #223 (permalink)  
Old 05-08-2017, 07:22 AM
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To replace or not to replace: roof skin on 77 Trans an

I'll play with it for another week or so yet before pulling the trigger on the new roof.

Again, are you guys thinking it's over shrunk??


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  #224 (permalink)  
Old 05-08-2017, 10:06 AM
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Quote:
Originally Posted by Schroeder View Post
I'll play with it for another week or so yet before pulling the trigger on the new roof.

Again, are you guys thinking it's over shrunk??


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Oh yeah.
It's over shrunk.
When you mentioned an oil can, there is no way we could have fathomed anything as huge as what you have here.

Next time someone says they have an oil can, I will insist on a video before moving forward.
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  #225 (permalink)  
Old 05-08-2017, 10:09 AM
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So I posed this question a few pages back and i don't know if an answer was given; can oil-canning be caused by over shrinking, just like over-stretching? Im guessing the answer is "yes." :-(


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