Subject:
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Re: Pneumatic Cylinders
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Newsgroups:
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lugnet.technic
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Date:
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Sun, 4 Apr 2004 04:16:26 GMT
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Viewed:
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1327 times
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In lugnet.technic, Mark Bellis wrote:
> 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?
Mark,
I have never felt the need to modify my pneumatic pistons. I just make things
work the way they are.
Kevin
>
> 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 is in Reply To:
 | | Pneumatic Cylinders
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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 (...) (20 years ago, 3-Apr-04, to lugnet.technic)
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