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Long Tuck Shrinking
Is there any advantage/reason for making some long tucking forks to get shrink happening further in from the edge of a panel? Or would that cause issues? I'm trying to get a panel to start wrapping downward about 7 inches from the edge on the inside of a fender. Or is it better to block that line while holding the panel on an angle to get the bend started there? Hope that makes sense.
IMG_20181120_155707780.jpg
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Rob 1950 Cadillac 1956 Cadillac Looking to build my own car from scratch Last edited by Steve Hamilton; 11-21-2018 at 01:23 PM. |
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I guess not haha
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Rob 1950 Cadillac 1956 Cadillac Looking to build my own car from scratch |
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You can Rob but it's not really a novice technique. A couple things to keep in mind.
1- Tuck shrinking really only works well when the panel is fairly flat. Once it gets shrunk on the edges, it's much more difficult to get the tucking forks in place. 2- Therefore, start tuck shrinking as deep as you will think you will ever need. Stretching is easy...shrinking is hard so if you over shrink, you can easily stretch it back out. 3- Shrinking happens in a pie shape. If you want a wedge shaped shrink say 3" deep and you want to shrink 1/4 of an inch 3" into the panel. Think about how much the panel has to shrink on the edge...probably 1" and 1/2" about at about 1.5" in. 4- Finally, the way to shrink deeper into the panel is to make a big tuck and just close the EDGE. Leave the bubble above it. You can then, with practice, drive the shrink inboard. It might help you to watch this video of my son Kris demonstrating our approach to tuck shrinking... https://www.youtube.com/watch?v=mkaCJ5gC3jI While you are on youtube you can search for tuck shrinking and there are others. There are lots of ways to do it and folks evolve a method that works for them. If someone is teaching you who says that their way is the only way...find another teacher. Finally, you mentioned you were hammering out your tucks on the floor. I suggest you at the minimum use a piece of 2x12 until you get a stump. Wood seems to hold the tuck up and keep it from sliding open better. You can do it on concrete but you'll get grit in your panel and spend more energy than necessary. When you find a stump (call up some tree surgeons...they can't split big stumps and have to pay to get rid of them. If you ask nice, they'll cut it to length for you. You want it about a couple inches above your crotch.
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Kerry Pinkerton |
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Not sure I understand where you are trying to go from here. If we are looking at the underside of a bowl (all sides curving toward you) and you want the portion by your foot to go away from you, then you are looking at making a reverse, in which case you will want to stretch.
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Jacob Hunsinger Shrinking using a stump: https://www.youtube.com/watch?v=-HAFndATFo4&t=7s Making a reverse using a stump: https://www.youtube.com/watch?v=7PlF1BoMCQI Circular Truss E-Wheel http://allmetalshaping.com/showthread.php?t=15419 |
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When I was looking for a stump I finally found an Elm stump from a guy that dealed in firewood. The problem is to get to someone before they cut it to firewood length.
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Norm Henderson |
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BTW, wheeling will make the panel much easier to work. All the grains in the metal are all screwed up because of the hammering. Wheeling lets them all go back into alignment and relaxes the metal so it's easier to work again.
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Kerry Pinkerton |
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Quote:
I ....DO NOT like to sound that I know it all ! PLEASE KEEP THIS IN MIND before reading the rest .................................................. .................................................. .................................................. .................................................. ... Unfortunately that is NOT the way to Tuck shrinking by hand or on a stump First of all... a tuck can be done on a flat panel and on a bulbous shape,the difference is that on bulbous shape you must use a proper bench dolly,also the tuck must be on the out side of the panel NOT on the inside second the tuck is closed from the end of the V not the front and for a much longer tuck....you can initiated it with the hammer and dolly then finished off with the tuck fork which would mean that you can tuck two feet deep or more (if needed) . When a tuck is made the way shown on the video, there is much more chance to overlap the metal, and it does not put shape needed on the front of the tuck .I am not being critical of your post but simply like to teach the right ways to perform tuck shrinking... YOU HAVE THE RIGHT TO THINK I AM WRONG I AM OK WITH THAT........ if that is the case, simply look at the way the thumb shrinking dies works, on the way in the tuck is made, then the shrinking is started from the back on the way out + When shrinking with a machine (Eckold or others) the shrinking is done by starting at the back, and proceeding towards the edge with heavier and wider area shrinking Peter
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P.Tommasini Metalshaping tools and dvds www.handbuilt.net.au Metalshaping clip on youtube http://www.youtube.com/watch?v=WEAh91hodPg Making Monaro Quarter panel: http://www.youtube.com/watch?v=KIpOhz0uGRM Last edited by Peter Tommasini; 11-21-2018 at 05:53 PM. |
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https://youtu.be/FIoge_zNREo
I made another video showing the progress on my fender And one of my problems with the tuck shrinking. Thank you all for your input.
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Rob 1950 Cadillac 1956 Cadillac Looking to build my own car from scratch |
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As I said Rob, there are lots of ways to do most everything in metal shaping. I described one, Peter another. There are more. If you ask 10 metal shapers the best way to do a thing, you'll probably get at least 12 answers... Do a search for 'Tuck Puck'.
Chose an approach that works for you. Peter, if you watch the video, all we are doing at the front is creating a 'lock' to keep the tuck from slipping away. The rest of the hammer blows start at the back and work forward alternating side to side with a chisel point plastic hammer. Wray Schelin taught me (and everyone else on MetalMeet in the early days) this technique and it works well for me. I believe it is still the technique he teaches although I also understand he uses a dished stump a good bit these days. Some of the guys who have taken his classes can comment if they choose. As far as the way thumbnail dies work, I agree completely but the difference is that the face of the die keeps the tuck from flattening out as it is crushed in the 'smile' area of the thumbnail. Dimpling in the front of the tuck keeps it from just flattening out when you hit it at the back. At least in my experience...which is considerably less than yours. I have never hammered a tuck over using this technique but have seen some folks who did. Like most things in shaping or swinging an axe, you need to be able to hit where you want. That takes practice and in metal shaping, practice makes scrap frequently. I will occasionally use a technique similar to what you describe because I have a bunch of post dollys but generally, I prefer to hammer on wood or plastic. I don't tuck shrink much these days, but sometimes, especially if the panel is too large to get into a machine, it's easier to put a shrink exactly where you want it with a tuck.
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Kerry Pinkerton |
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SAM_4176.jpg
SAM_4177.jpg SAM_4178.jpg SAM_4179.jpg SAM_4180.jpg SAM_4181.jpg SAM_4182.jpg SAM_4183.jpg SAM_4184.jpg SAM_4185.jpg SAM_4186.jpg SAM_4187.jpg SAM_4188.jpg SAM_4189.jpg SAM_4190.jpg SAM_4191.jpg SAM_4192.jpg SAM_4193.jpg SAM_4195.jpg SAM_4196.jpg SAM_4197.jpg SAM_4198.jpg SAM_4200.jpg SAM_4201.jpg SAM_4202.jpg SAM_4203.jpg SAM_4204.jpg SAM_4205.jpg SAM_4206.jpg SAM_4207.jpg SAM_4209.jpg SAM_4210.jpg SAM_4211.jpg Quote:
Here's some pictures, it might help you and save you some time in guessing. Follow the writing on the pictures and on the pattern and you should be right. The sequence should be from start to finish. Let me know how you go. P.S Please do yourself a favor and change that blocking hammer you are using because the one you're using, it's only good to break real walnuts.LOL Cheers Peter
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P.Tommasini Metalshaping tools and dvds www.handbuilt.net.au Metalshaping clip on youtube http://www.youtube.com/watch?v=WEAh91hodPg Making Monaro Quarter panel: http://www.youtube.com/watch?v=KIpOhz0uGRM Last edited by route56wingnut; 11-23-2018 at 06:31 AM. |
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