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Rotational to linear movement
2

Rotational to linear movement

Rotational to linear movement

(OP)
Which is the best screw thread to transfer torque into a linear motion? Trapezoidal, Acme or something like that? It will be used several times, so friction must be small such that the thread lasts for some time. The bolt is approximately 30mm diameter.

RE: Rotational to linear movement

For minimum friction, use a ball screw.

Benta.

RE: Rotational to linear movement

Here's a similar question:

What's the best motorized vehicle?  Miata, bulldozer or something like that?  I need it to have an engine and be able to drive both forward and backward.

In all seriousness, we will need a bit more detail to give a meaningful answer.

-handleman, CSWP (The new, easy test)

RE: Rotational to linear movement

(OP)
No worries, in my kind of work I am used to give a general answer in an early design phase based on the information we got, usually very limited. The best engineers I know can do this provided they know what they talk about, and add more information like; The best screw thread for this purpose is *****, but be aware of ****, and do not forget *****. One can't be an expert on everything handleman...;)

RE: Rotational to linear movement

So you expect someone to write you a free dissertation on screw thread selection?  Frankly it's a bit lazy of you.  Based on your information, nobody can say "The best screw thread for this purpose is ******" because you have given no detail about the purpose.  How about things like:

Speed (rotational/linear)
Available torque input
Required force output
Load
Vertical/horizontal
Required positional accuracy.
What does "Several" mean?  15 times in lifetime, or 3x/sec?
What are the operating conditions?  Heat, contamination, liquids, cleanliness requirements?
Required lifetime?


 

-handleman, CSWP (The new, easy test)

RE: Rotational to linear movement

always use acme ... ask coyote ! ... ;)

RE: Rotational to linear movement

For low tech (read as low cost), you cannot beat acme.  If you still have a budget after these last 9 months, go with ball screw.

RE: Rotational to linear movement

(OP)
Thank's...;) I will go for Acme or Stub Acme, we use it all the time in our applications, so it's familiar to us.

Have a nice day...

RE: Rotational to linear movement

A scotch yoke also does a neat job of rotary to linear, depending on your operating parametrs and loads.

RE: Rotational to linear movement

What about a simple slider crank mechanism or a rack/pinion combination.
peace

Fe

RE: Rotational to linear movement

(OP)
Maybe for another application, I must have a rotational nut for this oil tool (expandable plug). Preferrably everything should be as "round" as possible...

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