Subject:
|
Re: Pneumatic tubes capabilities
|
Newsgroups:
|
lugnet.technic
|
Date:
|
Fri, 6 Sep 2002 21:19:42 GMT
|
Viewed:
|
449 times
|
| |
|
|
In lugnet.technic, Thomas Avery writes:
> In lugnet.technic, Pedro Silva writes:
> > I have recently developed a pneumatic gizmo to remotely act on my train
> > track points, which is working quite nicely. The thing is, I don't know *how
> > far apart* can I place the compressor so that the loss of charge in the
> > tubes isn't too big. Has anyone tested this?
>
> From my experience, you can have really long tubes (10~20 feet, or more) and
> not have significant losses due to friction. What you should be concerned
> with is the volume of the tubes.
In a way, that was what I meant: since the tubes are made of rubber, they
are somewhat elastic (thus they can increase their volume significantly if
they are long enough).
> Basically, if you have a lot of long tubes, your system will behave as if it
> has an airtank. However, if you keep your system charged, this shouldn't be
> a problem. With your system fully pressurized, the operation of the cylinder
> should be instantaneous with the switch.
Ok, I guess I got it: it can work, but it must be always "on", either to one
side or the other.
Now a second question: one single compressor, equipped with one of the old
9V motors (high speed, low torque), can handle just how many cylinders *very
far apart*?
(just as an exercise, suppose 12 cyls, app 5 m apart each from the compressor)
> If you're operating one cylinder infrequently, the system should have plenty
> of time to charge back up, and you'll never have a delay in operation.
That was my hope. I think my idea can work, I just need to know how many
compressors to place.
Thanks Thomas!
Pedro
|
|
Message has 1 Reply:
 | | Re: Pneumatic tubes capabilities
|
| (...) I don't thing tube stretch is a factor here. The pneumatic tubes do not expand very much at the normal pressures of Lego pnuematics. The tubes are relatively stiff. The volume comes from just the long length of tubing. (Think of a volume (...) (22 years ago, 6-Sep-02, to lugnet.technic)
|
Message is in Reply To:
| | Re: Pneumatic tubes capabilities
|
| (...) From my experience, you can have really long tubes (10~20 feet, or more) and not have significant losses due to friction. What you should be concerned with is the volume of the tubes. Basically, if you have a lot of long tubes, your system (...) (22 years ago, 6-Sep-02, to lugnet.technic)
|
6 Messages in This Thread:
  
 
- Entire Thread on One Page:
- Nested:
All | Brief | Compact | Dots
Linear:
All | Brief | Compact
This Message and its Replies on One Page:
- Nested:
All | Brief | Compact | Dots
Linear:
All | Brief | Compact
|
|
|
|
