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Re: Limited stroke?
I can think of two possibilities, for future reference:
The first is in general to limit the stroke of a longer piston. This can be done by either not allowing it to reach its maximum length or not allowing it to reach its minimum length. We had excellent results last year limiting the travel of the piston that drove our claw using the latter method. We put several plastic standoffs along the rod, between the cylinder and the nut, and it worked great, plus we could have fine-tuned it with washers or sanding a little off the standoffs. In your case, though, adding an extra 6 inches or so to the mechanism might be difficult to fit into your design.
The second is to mount the shorter piston to points on the scissor with shorter ranges of motion - somewhere along the arms between the center axles and the outer axles. This adds the requirement that the arms be strong enough to take the additional force of the piston where it wasn't originally intended.
Best of all is the solution you hit upon, though. Good thinking.
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