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How To - Tips => Doors => Topic started by: Fieroking on February 19, 2016, 06:22:33 PM
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Does anyone have a way to figure out how strong a lift strut is needed for a door? A way to measure the force needed.
Looking for ideas.
Thanks
Joe Sokol (Fieroking)
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http://www.mcmaster.com/ (http://www.mcmaster.com/)
# 6465K7 27.76"
stroke 11.82" compress 15.94"
thats for diablo Adjustable pressure
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Joe,
Determine your mounting point on the door and lift it there with a fish scale. This will tell you how many pounds it takes to lift the door. Measure it through the entire swing to make sure the most force is needed at the beginning of the open. Mcmaster has bunches of good stuff, but you might find Austin Hardware an excellent source for those and other unique stuff. They specialize in custom chassis fabrication like fire trucks, ambulances, horse and utility trailers, etc. It is a one stop shop for everything from door latches to window felt to weatherstripping to cup holders.
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In addition to the previous two valuable comments, I will give my .02 in this regard. From my own experience with 3 real projects so far, I can tell that, no matter the measurements with formulas or software simulations, the only way to properly consider the compress strength of a door gas strut is to test it in the real life, complete with the power window, latch, inner door skin, hand rest and basically everything installed. Sometimes, even couple of kilograms or pounds may lead to improper- or not good enough operation of the gas strut.
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that is why NAERC use Mcmasters , after all door completed ,you can release the pressure to your needs.
Sam did you on his 6.0 build this
https://shop.suspa.com/c16-00357-gas-spring-p94.aspx lot cheaper ( non adjustable)
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My $.02. If you are going to try to save $60 and are using the fish scale and can actually attach it to the mounting point of the strut location on your entirely completed and finished door, I believe that the pull on the scale needs to be on the same angle as the strut from the body mount to the door mount. (Door in the closed position and unlatched)
Save all guess work and headache and just buy the McMasters adjustable strut.
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The adjustable gas struts seem to cost twice as mush, meaning that you are going to pay at least 2-3 times more money since they also require extra tools for measuring the pressure force. Also, you must be very careful with releasing the compressed gas, because it will permanently reduce the compression force, so there is no way back. The good thing about buying 2-3 different regular gas struts is, they are affordable, and after you figure out the proper pair to use in the doors, you can use the rest ones for the engine cover and front hood. And you can go with just one number from each type for the test. It's more likely that you won't lose any money by obtaining a few sets.
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Bobi, most guys with Diablo used Big Mc
The struts are only double then Suspa
Proper length and force . Some have different door inner panels
With dif gadgets on it.
And if you are carefull you release only hit by bit till you get the right move up and down. Lot easy then installing glass LOL
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Thanks for the replies. I got a scale today and it took about 110 pounds to lift the door half way. So I now have a start point to order struts from McMaster Carr.
Thanks
Joe Sokol