How do you make a two axis pivot?
May 3, 2011
How would you make a pivot that would allow motion in an arc around a tube of a larger diameter by a tube of a smaller diameter? The pivot must be able to be moved along the larger tube for adjustment.
Some starting ideas:
Nested hollow spheres. The inner sphere is split and drilled to fit around the larger conduit. It is held together by recessed cap screws. The outer sphere is drilled and hollow so that it can pivot around the large tube. Perpendicular to the hole there are two pivot axles. Mounted on the axles are two C channels with with bearings which form a box around both spheres. The second smaller tube is attached to the non-bearing sides of the channel-box. -[o]-
Replace the spheres with a ring captured by two clamps which are tightly around the larger tube and enough room between the clamps to permit the ring to pivot around the large tube. The ring has two pivot axles. The remainder of the pivot is similar to idea #1 above.