29hupp 52 Posted November 2, 2020 Share Posted November 2, 2020 Any suggestions as to the best way to bend aluminum roof molding. Need to make new look like original. Link to post Share on other sites
13CADDY 59 Posted November 2, 2020 Share Posted November 2, 2020 is that molding the one the goes around the roof insert ? Tom Link to post Share on other sites
29hupp 52 Posted November 2, 2020 Author Share Posted November 2, 2020 Yes it is Link to post Share on other sites
29hupp 52 Posted November 2, 2020 Author Share Posted November 2, 2020 Several back to back bends Link to post Share on other sites
Mark Gregory 689 Posted November 2, 2020 Share Posted November 2, 2020 I was wondering where did you buy that roof molding as my 1931 Reo Royale needs some also. Plus learning how to bend it is an excellent question. Link to post Share on other sites
1937hd45 3,213 Posted November 2, 2020 Share Posted November 2, 2020 Annealing aluminum to make it soft is as easy as making toast for breakfast. Bob 1 Link to post Share on other sites
29hupp 52 Posted November 2, 2020 Author Share Posted November 2, 2020 9 minutes ago, Mark Gregory said: I was wondering where did you buy that roof molding as my 1931 Reo Royale needs some also. Plus learning how to bend it is an excellent question. Bought it at Snyder's Antique Auto Parts. They sell Ford A & T parts but but it is close to what I needed. Don't forget to get the rubber filler. I am using 1" #4 SS pan head screws to hold it down. Had to put the screws in a drill and take a little off the heads on the grinder for clearance. 1 Link to post Share on other sites
Tinindian 1,706 Posted November 2, 2020 Share Posted November 2, 2020 I would think you would cut the piece a little long, start in the middle and attach it solidly until the first bend. Bend it with your hand and screw it down. Keep on until the end. I don't think you can pre bend it. Link to post Share on other sites
DavidMc 108 Posted November 2, 2020 Share Posted November 2, 2020 Find something flexible to fit into the groove to prevent it collapsing on the tighter bends and able to be removed after the bending . Flexible cabling works if you can find the right size 1 Link to post Share on other sites
viv w 199 Posted November 2, 2020 Share Posted November 2, 2020 I have had good results softening aluminum with a hot air paint stripping gun. Also works a treat, if used carefully, to heat up die cast pot metal if it is bent and needs straightening. An oldtimer friend of mine ,who was a sressed skin worker in aviation industry, also told me , use an oxy torch, first blacken the aluminum using just the acetylene, then heat it up with an oxy /acetylene flame until the black just starts to dissappear. at this point stop heating and it should be soft enough to bend. Link to post Share on other sites
29hupp 52 Posted November 2, 2020 Author Share Posted November 2, 2020 7 hours ago, Tinindian said: I would think you would cut the piece a little long, start in the middle and attach it solidly until the first bend. Bend it with your hand and screw it down. Keep on until the end. I don't think you can pre bend it. Thanks for the suggestions. I agree that pre bending is not the way to do it. Others have suggested annealing which my understanding occurs at about 775 degrees F which would be hard to do while attaching. Because of it's shape it just wants to kink when trying to bend sideways and I need to make a couple back to back bends. Other suggestions appreciated. Link to post Share on other sites
BearsFan315 611 Posted November 2, 2020 Share Posted November 2, 2020 Build a jig and go slowly... talk with Chistech (Ted) or look at his posts. He did this for my 1929 Chevrolet as well as several other vehicles. Link to post Share on other sites
Bhigdog 3,033 Posted November 2, 2020 Share Posted November 2, 2020 I agree with a plywood jig, anneal and pre bend. It's better to under bend and then adjust the radius tighter than over bend and try to adjust the radius larger. Stretching the molding making the bend is easy. Shrinking it not so much............Bob 1 Link to post Share on other sites
13CADDY 59 Posted November 2, 2020 Share Posted November 2, 2020 Did you buy enough extra to practice with ? Tom Link to post Share on other sites
WPVT 90 Posted November 3, 2020 Share Posted November 3, 2020 I seem to recall that bending a preformed aluminum lineal without kinking can be done by filling it with sand. I've never done this, but in theory, at least, it makes sense. Once it's packed well with sand, you would then bind the molding tightly with a narrow, strong tape...something that doesn't stretch . Annealed wire would be ideal, but time consuming unless you only did the bends. The idea is to confine the molding both internally and externally before you attempt the bend. In making a bend, you want to stretch one side of the molding, but prevent the opposite side from crimping. Link to post Share on other sites
29hupp 52 Posted November 3, 2020 Author Share Posted November 3, 2020 3 hours ago, 13CADDY said: Did you buy enough extra to practice with ? Tom No but I now wish I had. I even drove out of my way to Hershey to pick it up. Link to post Share on other sites
Mark Gregory 689 Posted November 3, 2020 Share Posted November 3, 2020 I seem to recall that bending a preformed aluminum lineal without kinking can be done by filling it with sand. I have seen them bend steel hot water heating pipes to make an expansion loop on a high rise building 50 years ago. But they hammered down the ends of the pipe so the sand was confined and would not move. So I do not know how you would keep the sand in place to cause some resistance to stop the crumpling of the aluminium section. Link to post Share on other sites
chistech 3,089 Posted November 3, 2020 Share Posted November 3, 2020 I’ve done quite a few GM roofs with the aluminum trim moldings sold by Bobs Buick. Because I do so many, I made up a jig with a roller bearing on a lever which allows me to bend both side, after simply changing the pattern form to the other side of my jig. I always bend the molding off the roof and where a gentle bend is needed like the sloping of the mid to rear of the roof, I pull the molding back and forth over my leg as I apply light pressure. My blue jeans add just enough friction to slightly warm the aluminum while I’m pushing it down some. The GM type molding resembles angle iron and after it’s screwed down to the car, the top of the “angle” gets swaged over. Most Automotive aluminum moldings are fully bendable as is and don’t need anealing but you will have to test yours. I would make a wood pattern in the shape of your roof and form the molding to it. It usually takes two sets of hands when forming a “one off” molding and sometimes three sets. One holds the start end fast and another can hold the other end applying pressure against the pattern. The third person uses a hardwood flat stick made to fit the molding and starts from the end working with taps of a hammer on the hardwood stick, swaging the molding to the shape of the pattern. I have learned to make my patterns slightly undersized and the bends slightly greater than the actual area. This allows for some bounce back and some elongation as it’s being formed to the pattern. When you put the molding on the roof, you want it to naturally pull itself down on the roof. 8 1 Link to post Share on other sites
Richard Arnett 6 Posted November 10, 2020 Share Posted November 10, 2020 Had to make a few tools to bend the roof molding. Very slow process but I can now move on to the next project. 3 Link to post Share on other sites
Richard Arnett 6 Posted November 10, 2020 Share Posted November 10, 2020 This also 3 Link to post Share on other sites
Roger Walling 638 Posted November 10, 2020 Share Posted November 10, 2020 If you bend it a little and then screw it down, it will not be a smooth bend at the screw hole. It will bend more at the hole and be a sharper bent at that small area. Link to post Share on other sites
BearsFan315 611 Posted November 10, 2020 Share Posted November 10, 2020 !! Ingenuity and Patience !! usually pays off in the end, especially on older vehicles Link to post Share on other sites
Mark Gregory 689 Posted November 23, 2020 Share Posted November 23, 2020 Thanks for the techniques and pictures very appreciated. Link to post Share on other sites
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