linear thrust to 90 degree turn 1

[thejack473]

i have this issue where i want to calculate a linear motion of 70 mm to turn an axle 90 degrees or more, it needs to be able to have an overhead because the piston only has 80 mm to use and need the 10 mm for the actuation of actually clamping down on the mechanism that gets turned 90 degrees.
so gearing and other motions that are continuous but cant take the 200 kN, that i'm going to put on it, seems to be out of the question for now.
i made up this simple tried and tested solution but i can't for the life of me find out how i'm going to calculate by forward thrust into angular motion.

https://youtu.be/-MRe2jUK_V8?t=1m36s

i do have an idea as shown in that still in my video of the different slides i've tried. that i can tell by the big circle that if it goes back and forward with 80mm it would turn 45 degrees and if the small circle also follows in that up motion it would be 90 degrees total. or i'm talking complete bollocks. but then i just need to figure out how to get some better lengths because currently the left slide goes into my axle and my right slide doesn't seem to entirely follow the circle in a linear pattern.
i'm sure there is an easy solution, and i'm just being a complete numpty.

many thanks in advance for ANY ideas on different solutions of getting this motion conversion, and/or, a solution to the one i put forth.

i also had one in which it was spring driven at the start but quickly ran into the issue that it didn't go to the full 90 degrees

https://youtu.be/WakhTeYSgPU

so that idea was scrapped for the V shaped thingamajig

 

[jlnsol]

Hey thejack473,
After reading your post and watching the videos I suggest to try avoiding pin/slot mechanisms for this since it will be difficult (nearly impossible) to keep hertz stresses acceptable under a 200kN load. I suggest investigating a bar linkage mechanism like the hydraulic scoop movement of an excavator.

 

[hendersdc]

Rack and pinion gear? [URL unfurl="true"]https://en.wikipedia.org/wiki/Rack_and_pinion[/url]

 

[BrianPetersen]

Dumb questions follow, because you haven't adequately explained why these wouldn't work.

What's wrong with a piston - connecting rod - crank, or something akin to it?

What's wrong with a rack and pinion?

What's wrong with a DeStaCo clamp or some similar over-center mechanism?

https://encrypted-tbn0.gstatic.com/...fBgss3-wHmM00BRfse8g9wYkZ5jjpclYwihcf4Dt4atBP

(there are many variations of this)

 

[thejack473]

good questions, Brian.
just to restate my problem a bit better. i need to make many clamps, which can automatically disengage clamping and turn upwards so that there is free room to lower a plate down onto the jaws that sourround on all four sides of this plate, then they turn back down onto the plate and without stressing that turning mechanism and ONLY the clamping mechanism reengage the 200-250kN of clamping force.
these sit very compactly to each other so the issues are: size (so they can sit closely together), non-continuous turning mechanism (so no stress is transfered to the turning), turning mechanisme needs to use the horizontal hydraulic press that strokes 90mm out, and lastly, the turning needs to be quick enough so that the piston turns the mechanism before it would get too near it (that's around 25 degrees over 42mm MAXIMUM into it's stroke of 90, as i don't want it to try to break itself, so if it can get past 25 degrees in 30mm that's a win).

you can se the theorized maximum turn and ingagement of the clamping forces here:

https://youtu.be/low3Yk6cfSg

the issue with a piston sort of thing turning a crankshaft via connecting rod, is that the turning point needs to be in front of the piston, not under.
the lower position is to so that it will rotate the clamping forces to vertically down, around the axle. also, i don't know how it would release when it turned the necessary amount and the piston do it's thing.

i made a solution based on the rack and pinion that is very scaleable and quite frankly i really like it, yet my colleagues aren't too happy about it as it isn't as simple to produce as the pins.

https://youtu.be/9wTd8YiJ70w

the DeStaCo clamp, i don't fully understand, do you suggest manually turning it? if so, these clamps are supposed to be automated, and with the shear amount of modules, this would become tedius really quickly.
if however you meant to use the "over-center mechanism" to turn press, i don't fully understand how you suggest this would be accomplished

to answer jlnsol, the pins won't be under load at any point more than a few newtons, the issue with the pin bars is that i can't fully get a calculateable distance to rotation translation. if just i could do that. all my issues would be solved... more or less.

 

[IFRs]

https://www.pascaleng.co.jp/us/products/work_clamp/

more specifically

https://www.pascaleng.co.jp/us/products/work_clamp/swing_clamp_7mpa/