So I got to thinking and came up with this:
I finally figured out how to trick the CNC machine.
These and the judicious use of 1/4-20 all thread, I should have a dressed up version of the Schlung method. Able to set the max extension, and compression. Plus Preload! That is a n old sachs fork spring, seems to be in the right range load wise.
more to come!
sorry, I get so stoked over these seemingly small victories...
I'd like to see this in action!
looks awesome. i cant wait to see how it works. the fork spring is genius, i might have to steal that idea.
Did you use Nylon? I've used it and it works fairly well but I bet you will find Acetel/Delrin will machine better and works better for that application. But maybe that already is Acetel, anyways just figured I would mention that. Also if you are feeling like experimenting I would suggest something else to build, just think pneumatic and dampened, I'm sending Benji something like that soon for testing.
-naz
Naz,
It ain't nothing fancy, it's .750 inch white acrylic (plexiglass)
When I finalize my design im gonna make it all out of 6061 alum. I might get fancy and order some rod ends from Mcmaster carr
Yeah I looked into somethings after you mentioned pneumatics and hydraulics. What catalogs are you shopping in, i saw some stuff in mcmaster, but it was a little too pricey for me right now, maybe later
we're working on a pneumatic system right now in milwaukee as well, i work in a hydraulics labratory so i've got tons of the stuff laying around.
the idea of using a gas spring had occured to me as well, i'm thinking along the lines of a simple pneumatic cylinder with an accumulator.
you can think easier then that... and I'm running a setup already on my bike and building some more for further testing. I'm sure you could probably come up with something even better though if you have all that equipment sitting around. I'm been riding around for couple weeks now with no issues and really like the damping effect. It smooths out the acceleration dramatically, no more surging etc and seems to be easier to tune the weights.
-naz
are you using a gas spring or just a damper with a regular spring? we've talked about doing both ideas, including doing a remote reservoir system with fluid and an accumulator, but this is the first really nasty AV10 anyone in milwaukee has built, so we have no idea how much force there will be or what frequencies we want to damp out, or how much resistance we want. The idea is that a hydropneumatic system can be easily used like a launch lever, with a controllable needle valve in the system one could adjust instead of having to change weights. We have the engine bracket made, and are working on the frame bracket, but we're waiting on a clutch pulley before we can design the actual strut.
Graham and Naz
Email me, this is tech i want to keep up with...
Already did....
Thank you Naz! I replied!
This is what I have so far, its just kinda jammed in there, it fits sorta. at first I was worried the spring was too short...
How many of you would be in agreement that the spring should probably be biased towards the pulley's side of the whole contraption
haha.
I would be in agreement that it should be biased toward the pulley side.
I love reading this.
hot damn! that is a very solid looking setup.
does anyone have pics of one of these linear springs, custom or not, in action?
Spring thingy that was home made.
-naz
http://moped.wordpress.com/2008/11/03/i-suck-at-blogging-update/snv13534/
another spring that was made in my shop...
-naz
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