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Originally Posted by Tom McCurdy
I was wondering if any team has had any experience using a scissor type arm. It currently seems to be our most likely design and I was wondering if it is something that can work. I am worried about how precise the parts must be made to keep the top level, and how we would need to make it slide at the top.
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Just about anything CAN work, but is it the best choice? If you really want to do a scissors (which I don't generally recommend) I suggest you go down to the local equipment rental place and take a really good look at the scissors-type man-lifts there. They have many subtle features that make them work well for their job.
A few other tips.
Make sure the joints cannot rotate out of plane
Make the sections very stiff
Make sure there is some distance between the line of action on the actuator and the pivots.
Be prepared to fall over a lot
Making the lift parts stiff enough can mean extra weight, generally in places you don't want it.