11-13-2012, 08:03 PM
I believe it's an extremely innovative idea.
I wouldn't worry about three points of fixing, build slight adjust-ability into at least one point. Easiest imo would be the top. Simply lower the knee right down prior to torquing the mount bolts which reside in slightly oversize holes, your could do the same easily at the base.
If you are worried, you could fix the top and bottom. Then build/fix the servo mount onto the end cap of the cylinder thus making it free to move if required while having the cylinder mounted to the more critical points (Knee and base)
Most commercial AND converted cnc mills have three points along the long axis with no ill side effects.
I wouldn't worry about three points of fixing, build slight adjust-ability into at least one point. Easiest imo would be the top. Simply lower the knee right down prior to torquing the mount bolts which reside in slightly oversize holes, your could do the same easily at the base.
If you are worried, you could fix the top and bottom. Then build/fix the servo mount onto the end cap of the cylinder thus making it free to move if required while having the cylinder mounted to the more critical points (Knee and base)
Most commercial AND converted cnc mills have three points along the long axis with no ill side effects.