Subject:
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Re: Custom Pneumatic Parts
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Newsgroups:
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lugnet.technic
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Date:
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Tue, 13 May 2003 12:44:19 GMT
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Viewed:
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953 times
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Actually Dave I was thinking of modifying a cylinder by using the end caps
and replacing the tube with a custom length and a rod/piston assembly to
match. Replacing the connector on the end of the rod would be easy using a
#1 angle connector that was drilled and tapped. The two main obstacles I
see are finding the correct size tubing for the body of the cylinder and
machining the caps so they could be re-attached to the new tube. As long as
the end caps don't crack during the machining process, it should be fairly
straight forward to glue them onto a new tube. This will retain the
compatibility with the "standard" pneumatic tubing and the pin connectors on
the base.
Now I just have to find the tubing needed. Does anyone know if there are
any particular properties to the plastic used in Lego parts? I have a local
plastic supplier I have dealt with before, if the tubing exists they should
be able to find it.
Greg
"Purple Dave" <purpledave@maskofdestiny.com> wrote in message
news:HEtrxA.1DwG@lugnet.com...
> In lugnet.technic, Gregory Muri writes:
> > I was just curious if anybody had ever tried to make any custom length
> > cylinders that were functional with the Lego pneumatics. I was thinking
> > about it the other day and it seems like it shouldn't be that difficult.
>
> It might be more difficult than you'd think. If you try to splice • two
> tubes together you could very easily ruin the integrity of the internal • seal
> (either by creating a bump where it'll catch or a void where it'll lose • its
> seal), causing your cylinder to stall out when it hits the midway point.
> Also, extending the existing shaft would require either welding or • brazing,
> either of which will pretty much destroy any attached plasticky bits. If
> you're interested in doing this, you'd probably need to find tube and • shaft
> to match the existing cylinder, completely strip the existing tube and • shaft
> from the cylinder you want to extend, and swap the new pieces in. If the
> pneumatic cylinders had wholly seperate end-blocks it would be a lot • easier,
> but the one that I've got in front of me (Mindstorms: Universal Building
> Set) has the tube formed into the bricky end-block, and has special clips
> and the opposing pneumatic fitting formed into the other end. This means
> that in order to extend that cylinder, you'd need to cut it in the middle,
> true up the ends, splice in a third section, and somehow manage to polish
> the joints smooth on the inside with something flexible that could fit
> through a hole that's just under 1/16" in diameter. It would be far • easier
> to build a series of unmodified pneumatic cylinders (I know of a company
> that does it for pushers on conveyor systems).
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Message is in Reply To:
 | | Re: Custom Pneumatic Parts
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| (...) It might be more difficult than you'd think. If you try to splice two tubes together you could very easily ruin the integrity of the internal seal (either by creating a bump where it'll catch or a void where it'll lose its seal), causing your (...) (21 years ago, 13-May-03, to lugnet.technic)
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