Previous in Forum: Water Tank Design   Next in Forum: Submerged Electromagnets
Close
Close
Close
3 comments
Participant
Engineering Fields - Mechanical Engineering - New Member

Join Date: Feb 2007
Location: Philippines
Posts: 2

Alternative Linear Mechanism

02/20/2007 8:49 AM

currently, our machine has a moving mechanism that requires long travel. the mechanism was designed to have rollers on a stainless steel runway (square bar ) on its top portion while a pair of rollers and a flat bar on its middle as a guide on its lower part.

any idea on how am i going to improve the design for smoother, accurate, rigid and reliable linear movement?...

Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
Active Contributor

Join Date: Feb 2007
Posts: 11
#1

Re: Alternative Linear Mechanism

02/20/2007 4:09 PM

I would sugget using rollers on the inside of two C-channel runway. Your devise would have a trolley motion inside of the channels. Leaving a gap between the channels allows for your moving mechanism to be attached to the trolley. You can control perpendicular motion by installing guide rollers that fit between the gaps, two in front and two in back that are attached to the trolley. As far as linear motion and where your devise needs to be stopped, that requires more detail. The mass that you are moving, what power source are you using to move the mechanism, both need to be considered. I hope this helps!

Register to Reply
Guru
Brazil - Member - New Member Engineering Fields - Mechanical Engineering - New Member Hobbies - RC Aircraft - New Member Hobbies - Target Shooting - New Member Hobbies - Automotive Performance - Hey there... interested in exchanging information about car performance? Hobbies - DIY Welding - New Member

Join Date: Jan 2007
Location: Porto Alegre - RS - Brazil 30deg01'39.73"S 51deg13'43.45"W
Posts: 831
Good Answers: 28
#2

Re: Alternative Linear Mechanism

02/20/2007 6:29 PM

In the same way of thinking, I remembered that tracks made like a trelice with three tubes, 2 tubes being the car support and one being the support for the other two. This arrangement gives multi-direction support with two tracks. A good arrangement if track rigidity is a must, because you can improve it by placing the tubes and building a 3D trelice, light and stiff.

If you need just vertical suport and linear movement, I've seen a good example on a train leading to the Corcovado mount in Rio de Janeiro. It's a conventional track, with linear gears to push the train uphill. In Santiago de CHile, I've seen something similar, but with steel cables doing the job.

__________________
Humm... suspicious you are...
Register to Reply
Guru

Join Date: May 2006
Location: Placerville, CA (38° 45N, 120° 47'W)
Posts: 6024
Good Answers: 245
#3

Re: Alternative Linear Mechanism

02/21/2007 12:40 PM

Long travel means very different things in different situations! in the machines that I design, long travel means over about 10 cm, whereas the funicular elevators or trains mentioned by the person from Brazil may travel many km, like the one that used to cross the Andes near Mt. Aconcagua.

You also make no mention of the positional accuracy required: If you are moving laser optics for precision cutting, you need to maintain both longitudinal and transverse position within a few thousandths of an inch (hundredths of a mm) or better over the entire range of travel, while a funicular elevator only needs to have positional accuracy at the stopping points. Precision costs money, but an appropriate amount is a necessity!

Give us some details!

__________________
Teaching is a great experience, but there is no better teacher than experience.
Register to Reply
Register to Reply 3 comments
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
Copy to Clipboard

Users who posted comments:

bhrescobar (1); dkwarner (1); dskktb (1)

Previous in Forum: Water Tank Design   Next in Forum: Submerged Electromagnets

Advertisement