I am looking for a rotating joint
I am looking for a rotating joint
(OP)
DRIVING rod: This rod is making a simple in-out movement. 4" (10 cm) movement.
DRIVEN rod: This rod follows DRIVING. This rod also rotates (2 revolutions).
Both rods are about 1" (2.5 cm) in diameter. End surface of the rods has a tapped hole, on the axis of the rod.
I need a joint that connects the two, transferring 4" movement from DRIVING to DRIVEN, allowing DRIVEN to rotate. DRIVING does not rotate. I can drill/tap additional holes to both rods. I can modify both rods.
DRIVEN rod: This rod follows DRIVING. This rod also rotates (2 revolutions).
Both rods are about 1" (2.5 cm) in diameter. End surface of the rods has a tapped hole, on the axis of the rod.
I need a joint that connects the two, transferring 4" movement from DRIVING to DRIVEN, allowing DRIVEN to rotate. DRIVING does not rotate. I can drill/tap additional holes to both rods. I can modify both rods.





RE: I am looking for a rotating joint
DriveR: reciprocating linear movement (4"), 1" diameter
DriveN: reciprocating linear movement (4"), 1" diameter, also rotates (2 revolutions, whatever that means?)
I'm taking a complete shot in the dark and I'm just going to leave you with the term "Barrel Cam".
You need to be more specific on what you're trying to do, preferably with a diagram.
RE: I am looking for a rotating joint
DriveN is what you see. DriveR is not seen.
RE: I am looking for a rotating joint
RE: I am looking for a rotating joint
RE: I am looking for a rotating joint
RE: I am looking for a rotating joint
RE: I am looking for a rotating joint
RE: I am looking for a rotating joint
Are the driven rod and driving rods collinear?
If so, I would be looking at some kind of coupling assembly where the driven rod is fixed to the inner race of an angular contact bearing, and the driving rod is fixed to the outer race. Another possibility is a spring loaded assembly using thrust bearings between the fixed and rotating surfaces.
RE: I am looking for a rotating joint
What loads and "rpm" are involved?
http://www.yourhondaparts.com/media/images/oe/coll...
http://www.gglotus.org/ggtech/m100-lcu-manual/m100...
Indepenedent front suspension ball joint. One handles radial and axial (holding up the car) forces, the other (in a non macphersone strut suspension) one handle primarily radial forces.
Rotates thru ~ 90 degrees, but that is limited by the rest of the car, not the ball joint.
Suspension Ball joints can Transmit axial force primarily in one direction based on suspension design, but often are preloaded with springs, etc for zero clearance, which might result in quite modest axial capacity in the "wrong" direction.
If the shafts are not aligned VERY well coaxially the ball joint would be subjected to radial forces, which it would resist strenuously.
Some kind of a flat faced washer in place ot the ball would allow radial shift.
RE: I am looking for a rotating joint
I checked the straight spherical joint. It allows rotations/pivots but is not designed to allow 4 rotations in a second (2 CW and 2 CCW). I need a bearing of some kind.
sensij1,
Yes, both DriveR and DriveN are colinear. I plan to use a pneumatic cylinder (double acting) as the DriveR.
tmoose,
The joint I am looking for needs to be capable of 4 revolutions a second.
I need a bearing-based joint. If there is off-the-shelf type available, please let me know. Thanks.
RE: I am looking for a rotating joint
I can imagine a few ways to accomplish this.
RE: I am looking for a rotating joint
RE: I am looking for a rotating joint
RE: I am looking for a rotating joint
RE: I am looking for a rotating joint
But there are many suppliers of custom lead screw shafts and linear motion components that could supply what you need, either to your drawings, or design what you need if you give them quantifiable criteria.
RE: I am looking for a rotating joint
RE: I am looking for a rotating joint
RE: I am looking for a rotating joint
Rotating motor drives gearbox drives crank arm.
Crank arm has a combination clevis and thrust bearing that imparts a oscillating linear motion to the shaft.
The shaft has a lead screw thread on the opposite end that reacts against a fixed nut to create the rotation.
My suggestion:
Motor drives hollow-quill gearbox with ball spline nut mounted to the gearbox.
Ball spline nut drives ball spline on one end of the shaft. This imparts rotation to the shaft.
The other end has a self-reversing screw thread. The reaction of the nut on the thread imparts the linear oscillating motion.
RE: I am looking for a rotating joint
RE: I am looking for a rotating joint
Ignoring the whole redesign thing, doesn't he just need a thrust bearing to link one reciprocating shaft to another, while allowing rotation? Double row tapered roller? Maybe just a deep groove ball lying on someones desk? You just need to let a machinist turn up a shaft and housing for a bearing in the morning, barely even need to give them any instruction.
Am I thinking too agricultural?