dogman dan said:
Pretty easy to make custom torque arms, if you have a few basic tools. Drill, file, angle grinder, and a pair of vise grips.
One thing alot of peeps forget... to mention... is the hardness.
IDKY but Im a metalhed, and I always gotta mention.
Just carbonize it ( the steel.. ).. with a acetylene torch. Make it 100X harder ( case hardened too, so stiff core and hard strong shell).... heat it up red and shoot burnt acetylene ( No O2, turn the O2 off for a carbonizing flame) over it, and let the red hot metal absorb the burnt carbon from the torch ( acetylene burning so rich it produces carbon in atmosphere without regulated O2 feeding the non-stoich lambda of the flame.. creating a carbon shell of hardened metal... ) and you wont ever drill, marr, file,, cut, or break that thing again. Or use the powder case hardening compound: works the same way.
I dont know ( read: highly doubt) anything "lasercyut" is strong enough ( you know the power laser take and what they cost? Anyone who can caters to ebikers has a cheap laser , let me tell you. Lol. No $250,000 machine working for us ebikers, we are to cheap... or poor... ) or any grade of good steel.
qwerkus said:
So what I recommend now is simply ordering the parts at some online laser cutting website. Surprisingly cheap, and perfect tolerances.
Link to the "chep" ones? I only know of the ones wanting alot of money, esp for one offs.
I personally have Mennonite kids who will plasma CNC anything for me.
Grin tq arms are what, stamped, stainless, or shat steel? Anybody?
On emachineshop you can of course choose you metal and whatnot.. : you might even be able to request tool steel and have that lasered.. but the cost of lasering stuff on emachineshop is silly. Plus that edge.
Cracks become the only danger. , but it held...
You will be able to anneal it if you have the time and some more Oxy/ Acetylene for the annealing.
i just welded a big washer to a steel open dropout to a wrench. Then hardened. Holds 8Kw and 50mph impact loading. In aluminum open dropouts. Lol.
It must be cause I can weld that I also think the simple fabrication of a Tq. arm is easy peasy, and if you understand the fundamentals, should be easy to beat the sellers options that we have ..... better and stronger.