To replace or not to replace: roof skin on 77 Trans an - Page 11 - Hot Rod Forum : Hotrodders Bulletin Board
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  #151 (permalink)  
Old 04-21-2017, 11:00 AM
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OP: make a very low crown on your practice piece and try your shrinking disc.

You're still talking about using a MIG to shrink????

Or just go straight to your roof skin and skim the shrinking disc across the highs on your roof skin and be prepared to be amazed.
Just get it a bit hot and hit it with a damp cloth.

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  #152 (permalink)  
Old 04-22-2017, 07:57 AM
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To replace or not to replace: roof skin on 77 Trans an

Well I'm hoping the shrinking disc will work but I wasn't impressed with my test plan. I do realize the crown was excessive from the wheel though.

What do you guys think about using this pry bar for a slapper?! They're tough, spring steel. I thought this was a great idea? Of course the edges would have to be ground and rounded. These are cheap at any home store though.





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  #153 (permalink)  
Old 04-22-2017, 08:20 AM
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Those are nice and hard so should work OK.

May end up being too light though.
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  #154 (permalink)  
Old 04-22-2017, 09:04 AM
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Quote:
Originally Posted by Schroeder View Post

What do you guys think about using this pry bar for a slapper?!
No idea here. I can't understand why this particular tool is worth investing one minute of fabrication effort.
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  #155 (permalink)  
Old 04-22-2017, 09:56 AM
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Originally Posted by idrivejunk View Post
No idea here. I can't understand why this particular tool is worth investing one minute of fabrication effort.
You have to put your mindset as a hobbyist.

We will try to spend time making stuff rather than spending dollars.
If I need tools for work, they are bought, not made.
When I need tools to play with my rod, they are made not bought, if it's feasible. I can make a slapper in a couple hours. As much time as going out to buy one.

As a hobbyist, my time is free.
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  #156 (permalink)  
Old 04-22-2017, 10:00 AM
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IDJ, I can see your point. The slappers I saw were all like $30 aside from the harbor freight one you linked to. I plan on picking that up sooner or later. I saw this this morning though, and when I thought of it I thought I should share for others if nothing else.


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  #157 (permalink)  
Old 04-22-2017, 10:51 AM
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Quote:
Originally Posted by 123pugsy View Post
You have to put your mindset as a hobbyist.

We will try to spend time making stuff rather than spending dollars.
If I need tools for work, they are bought, not made.
When I need tools to play with my rod, they are made not bought, if it's feasible. I can make a slapper in a couple hours. As much time as going out to buy one.

As a hobbyist, my time is free.
When we're young, we brag how much things cost. When older, we brag how little things cost. I thought maybe it was just that. Can't really imagine what its like having a bodywork hobby anymore, I had to extinguish that part of me to do it for a living. Perhaps one day I can understand. If I had to make a slapper I would probably reach for that leaf spring and find a bed of hot coals with an anvil nearby. Too many westerns maybe
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  #158 (permalink)  
Old 04-22-2017, 11:04 AM
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Quote:
Originally Posted by Schroeder View Post
IDJ, I can see your point. The slappers I saw were all like $30 aside from the harbor freight one you linked to. I plan on picking that up sooner or later. I saw this this morning though, and when I thought of it I thought I should share for others if nothing else.


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Carry on, I understand that. A lot of people just want their car done, others don't care when. Everybody cares about cost though, even the deep pocketed ones. My tendency to finish things rather than study them won't wash off, because as a person who works on other people's vehicles it would be criminal to put my personal curiosity first. Just go at your own pace and digest fundamentals as the project allows, I'm not wanting to rush you.
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  #159 (permalink)  
Old 04-30-2017, 03:02 PM
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Alrifht guys so I tried out the shrinking disc today. I'm satisfied- I think. Take s look at the pics below. The worked the 3 worst spots. #3 was the worst one that I really boogered up. #2 & #1 weren't as bad.

The before pics show my fingers 1 thru 3 by each dent. The after pics show more of my hand with 1 thru 3 raised up.

1 before


1 after


2 before


2 after


3 before


3 after


I ran a straight edge over each problem area after shrinking. I don't think there are any high areas anymore. The inward dents are about 1/64" deep. Does it get much better than that for a beginner? I would love to get it perfect like you see in youtube vids and such, but I also don't want to end up wearing a hole in my roof skin or something. If this is shoddy work and I need to do more, please say so!!

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  #160 (permalink)  
Old 04-30-2017, 05:08 PM
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It's only shoddy work if you left an oil can popping up and down.

Once you have it all firmed up and no spots are high, it's perfect.

PS: Always trust the "magic" s/s shrinking disc.
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  #161 (permalink)  
Old 04-30-2017, 05:17 PM
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Area 3 has a large oil canning area around it. It's probably 4"-5" in diameter. I though I had found some high spots around and in it, but they were so small I could have just been looking too hard. I tried shrinking these areas and while shrinking the dent would actualy pop in the stay there after cooling. Then I would get the slapper out and smack it from the back side to keep the oil canning from the outside in. I have been chasing this for about 2-3 hrs. I have made no progress and am starting to worrying I'm making ripples in the panel, although I could be imagining this too. How am I supposed to find the exact spots causing this issue? Is oil canning ALWAYS caused by stretched metal? Can excessive shrinking make an oil can?

What's so bad about oil canning anyway? Does it cause paint crack and failure? The panel looks completely flat, it just oil cans.

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  #162 (permalink)  
Old 04-30-2017, 05:29 PM
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Quote:
Originally Posted by Schroeder View Post
Area 3 has a large oil canning area around it. It's probably 4"-5" in diameter. I though I had found some high spots around and in it, but they were so small I could have just been looking too hard. I tried shrinking these areas and while shrinking the dent would actualy pop in the stay there after cooling. Then I would get the slapper out and smack it from the back side to keep the oil canning from the outside in. I have been chasing this for about 2-3 hrs. I have made no progress and am starting to worrying I'm making ripples in the panel, although I could be imagining this too. How am I supposed to find the exact spots causing this issue? Is oil canning ALWAYS caused by stretched metal? Can excessive shrinking make an oil can?

What's so bad about oil canning anyway? Does it cause paint crack and failure? The panel looks completely flat, it just oil cans.

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If it oil cans, it's not flat when it's popped up.

Take something like a flexible plastic ruler and kind of shape it to the panel and take a good hard look.

You still need to shrink some more. Pop it up and go at it.
Keep your disc clean so you are not disillusioned as you are now that the panel is getting thin.

Actually, the more you shrink, the thicker it gets. Maybe it breaks out even with the micro amount of metal that sticks to the shrinking disc.

Use a few drops of soap in your squirt water.
A bit will remain behind for your next round of shrinking.
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  #163 (permalink)  
Old 04-30-2017, 06:14 PM
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The high spots I think I find behave strangely. I will shrink them and as I shrink them the whole dent sucks in. Typically on a normal high spot it seems like the heat makes the outward dent bubble up more so. This area sucks in when what I think is a high spot gets some heat from the disc. It will stay in too at that point. A huge inward dent. So I'll smack it up lightly with my spoon and be back at square one. I have been flipping the skin over and over tying to find a high spot on the outside and underside both. Is there anyway to identify the exact cause of an oil can? At first I was thinking that the spot you press on that makes the oil a effect is the spot that needs shrink. I do not think this is the case though.

I'm chasing my tail on this one guys and a little worried that I'm making the #3 problem spot WAY bigger. Also, I don't know if I have 2 oil can dents right on top of each other or just a huge one. The picture shows a glove pointing to a spot I can press in, and it will not oil can back up. When I press the point I am pointing to with my finger, the first spot will pop back up.




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  #164 (permalink)  
Old 04-30-2017, 06:36 PM
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Just run the disc in the general vicinity and spray with soapy water.
Eventually, you'll find it, the bubble will be gone and you'll high 5 yourself.
Try different places but no to far out from anywhere you've worked.

Trust me....ha...ya right, a keyboard cowboy you don't know....
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  #165 (permalink)  
Old 04-30-2017, 06:38 PM
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Do you mean heat the whole area at once and spray or just keep doing little spots in until I've covered the whole area? Are there tricks to finding the problem area?

You keyboard cowboys have helped me tremendously thus far!!


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