Grantmac said:I REALLY like that! I've thought about using T-bolt clamps plus some sort of backing material in a similar way.
tentman said:The materiel in bike frame tubes is very thin and a principle I learned in building boat masts was to ensure all "load points" had wide, ideally tapered bearing surfaces . . . I liked your first clamp idea better.
Grantmac said:You may need a webbing with less elasticity than polyester. Maybe something like HMPE?
I'd want some sort of backing so the t-bolt strapping doesn't ride directly on the frame. Both a longer mount on the bottom and some sort of conforming top piece.
Grantmac said:It's strong but it creeps so you'll need to retension it multiple times most likely. It's used for running rigging (which controls the sails) on sailboats but not used for the standing rigging (which supports the mast) for that reason. Likewise it's not used for bowstrings (another hobby of mine).
HMPE has basically the same elasticity as steel. I like non-metallic options when possible since they have less chance for galvanic corrosion.
Grantmac said:I wouldn't touch kevlar, it doesn't have the working envelope you want. Specifically almost no resistance to abrasion and it doesn't work well around bends.
HMPE is commonly called by it's trademark name of "Dyneema" and you can buy webbing for climbing or sailmaking. It's brilliant stuff, a single .021" strand will easily hold +100lbs with almost zero stretch.
Skaiwerd said:Myself I’d be hesitant to say done at this stage.
qwerkus said:How about getting helical planetary gears? Less noise, more torque, but you also need bearing able to deal with the lateral forces.
Animalector said:any updates?
Lithium_Bob said:Hi cozy35. Have you had any progress with this project?