Metric or SAE? Have been designing an exercise go cart that keeps the energy in an hydraulic accumulator~

Asked by Jun 03, 2013 at 12:32 AM

Question type: General

Designed all pieces about five years ago....1/8 scale plots went to inventhelp.com that
said that I needed to 'build one' so they could put it before their board of investors for
the small price of $300.00...then they kept my drawings....and the computer with the
pirated version of Autocad crashed and burned taking the data with it...Now I'm going to
use a pencil and sketchpad and if anyone sees fit to use their solid modeler would
make this whole project much easier to understand....down to a yellow pad and
ticonderoga...have the MISU automation components (where I'm getting the pivot pin)
and was thinkin' on Enerpak (cause they are from Milwaukee too) but a bimba cylinder
would probably do it...just need to check actual pressures involved here~...anyways
the machinery's handbook is mostly Society of Automotive Engineers...Not
International Standards Organization (metric)...so 8" stroke 200mm. 20cm is not
intuitive....a learning curve to adjust to normal metric numbers would be one spoiler~

Really if interested in helping with the hydraulic considerations such as reversing the
flow for braking/capturing the forces...then givin' it the go....and man what go if you've
ever seen what the full potential of an hydraulic accumulator can provide....bullet
speed.~

3 Answers

there is a lot of 'sneaky' ideas that sensible Engineers will poo-poo, such as a "roller bearing-motor" in which the inner race is lazer cut and fitted with a banjo style fitting, and the other side too, clamped to the a-frame chassis, and the wheel will follow the flow of the bearing...really simple...what's the big hooot, the three o-rings on the space shuttle~ we can and have done dynamic high pressure seals...don't gimme that~

the seat is the mid-grade tractor seat from Northern Tool- 20cm stroke expands to the full travel of a man's leg motion thru mechanical advantage---actually need to do some math to calculate what displacement or bore...aircraft hydraulic servos are aluminum and designed to withstand pressures....will have to do a little more shopping...the question remains...metric...or not?

209,875

I'd go metric and most designs these days are going that way. But it all depends on the "customer". Some machine shops prefer one set of dimensions over another, but can always be converted. So either way you will be fine. Good Luck.

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