Subject:
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Pneumatic Cylinders
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Newsgroups:
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lugnet.technic
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Date:
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Sat, 3 Apr 2004 22:36:44 GMT
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Viewed:
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1334 times
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I've bought quite a few 8455 excavators now and in all of them the pneumatic
cylinders have restricted air flow due to partially blocked nozzles. The amount
of restriction varies, as measured by extending and contracting the cylinders by
hand and feeling the amount of force required to move them quickly.
So far I've used a 1.4mm screwdriver to bore out the nozzles so that air can
flow faster. You do this at your own risk!
I suppose the flow restriction helps the cylinders to move smoothly but I wanted
them to move faster, particularly for doing logic functions when moving other
switches, as it's better to move the switch all the way at once.
Also, in a power application, such as lifting an arm, more source pressure is
required to move a cylinder that has flow restrictions at the same rate as one
that doesn't. It's a bit like friction within a motor. The consequence is more
use of the hand pumps and then a need to release the excess pressure later.
This, in addition to the balloon effect of rubber tubes, makes the system quite
inefficient.
Are the nozzles supposed to be restricted or not?
Have you had the same problem?
Would you recommend boring out the nozzles as I have?
BTW where can I get a 100m reel of the thin tubing used for the flex system? I
would cut this to length and use it for all the straight tubes in a model with
rubber ones only for the corners, reducing the balloon effect to a minimum and
increasing efficiency and speed by saving on the amount of air required to
operate pneumatic models.
Mark
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Message has 2 Replies:
 | | Re: Pneumatic Cylinders
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| (...) Mark, I have never felt the need to modify my pneumatic pistons. I just make things work the way they are. Kevin (...) (20 years ago, 4-Apr-04, to lugnet.technic)
| | | Re: Pneumatic Cylinders
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| (...) Hi Mark, Here is a post by Martin Bruun on the subject that may interest you: (URL) am recopying the text of the message here, as BrickLink only keeps posts for six months and this information may be useful even though it was primarily (...) (20 years ago, 4-Apr-04, to lugnet.technic)
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