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Has anyone used a Van Mark brake for bending their spars? According to the person I spoke with at Van Mark, their inside bend radius is 0.09†and not the requisite 0.10†as noted on the plans. This is only 1/100 th of an inch short. Is this within the acceptable allowance? Any feedback is greatly appreciated
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This video is aimed at the zenith aircraft(has a ton of bends to do)....we just need it mainly for the wings..so you can get away with not owning one yourself ... it gives you an idea of what type of brake you need
Originally posted by Lee S View Post
when I first got into scratch building this was the first type of question I asked also
im on the road with spotty cell service so I couldn’t do a real good read on the brake you’re taking about .. but it appears to be a roofing eaves trough type of mobile bending brake...
those brakes just just don’t have the strength to do the bending you need.... the kind of brake you need is much bigger...furnace duct type brake...sheet metal brake
if you’re near an eaa chapter they will have one....or a local metal fabricator, school shop, heating ac guys...but a foot radius tool needs to be used on those as shown in the bearhawk book/plans
..., I’m sure later in the day more guys will chime in on this....
have a good one..Last edited by way_up_north; 08-15-2019, 01:47 PM. -
Won’t work...way too weak. Find someone that has a heavy duty leaf brake like these: https://www.baileigh.com/metalworkin...t-metal-brakes
If you go to a sheet metal shop, don’t tell them it’s for an airplane or they might not do it. Typical brakes will need an additional shoe to get the desired radius. As far as tolerances, get a radius gage set and follow the specs. Gages are cheap and you can’t go wrong.Comment
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Thank you for your responses - all good advice. I know a few people in the HVAC business, so I might go that route. I really like the convenience and freedom of having a brake in my own shop, so I’m likely going to build my own. Thought maybe I could save some time and $$$ and get by with the Van Mark. Guess that was wishful thinking. Thank you “Way up North†for the attached video and thank you Alaskabearhawk for all your YouTube videos! Next time I’m doing the “Kenai flop†for reds, I might look you up and say hi.Comment
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more then you ever wanted to know about bending brakes and theory
Last edited by way_up_north; 08-17-2019, 11:38 PM.Comment
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