How to translate from vertical motion to rotational
How to translate from vertical motion to rotational
(OP)
Imagine, if you will...
A valve which is typically actuated via vertical displacement (downward stroke)...
However, I have managed a means to activate the valve via rotational motion.
I was hoping to get a few ideas from the forum on how to translate the vertical motion (I have to deal with this as a prerequisite to design is retrofit to existing product)to rotational.
I need only rotate a 3/8 diameter shaft 50 - 60 degrees...
Any thoughts?
RamPower made RamTough
A valve which is typically actuated via vertical displacement (downward stroke)...
However, I have managed a means to activate the valve via rotational motion.
I was hoping to get a few ideas from the forum on how to translate the vertical motion (I have to deal with this as a prerequisite to design is retrofit to existing product)to rotational.
I need only rotate a 3/8 diameter shaft 50 - 60 degrees...
Any thoughts?
RamPower made RamTough





RE: How to translate from vertical motion to rotational
Linkage connecting a lever arm on your rotational element to the linear element.
RE: How to translate from vertical motion to rotational
http://www.flowserve.com/valves/automation/pages/heavy_duty.stm
RE: How to translate from vertical motion to rotational
Denande
RE: How to translate from vertical motion to rotational
I would use a trick utilized with downhole equipment such as packer or wireline apparatus in the oilfield. Cut a closed J Slot into the stem of the valve, and have a pair of lugs "cam" rotational motion as the stem rises or falls.
Alternatively, you should be able to simplify rotational motion by cutting a helix into the stem and have rotational motion as a consequence to a pair of lugs riding in the slot. This would be more cost effective and easily machinable with a mill. In addition, you get a compact design without the need of a bulky Scotch Yoke mechanism to translate linear to rotational motion.
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada
RE: How to translate from vertical motion to rotational
RE: How to translate from vertical motion to rotational
I have an application where I use essentially Cockroach's alternative (helix) to obtain 60 degree rotation from linear input. The rotation output axis is coincident with the line of action of the linear input.
The pitch of the helix for a given 60 degree rotation determines the linear stroke. The peak force required for the linear input stroke varies inversely with the stroke required and directly with the output torque required.
RE: How to translate from vertical motion to rotational
RE: How to translate from vertical motion to rotational
Gentlemen (and ladies as applicable),
Thanks for all your input! Cockroach, it was scary reading your response. While out of the office I had our prototype shop start fab'g parts with virtually the same methodology / design as you describe. The valve will still have slight vertical motion (a function of the helical slot slope?) however primary motion will be rotational.
Thanks again for the inputs...
Rampower