Pneumatics General Discussion

[Aurorasaurus]

@Milan Maybe these topics should be merged?

[Milan]

1 hour ago, Aurorasaurus said:

Maybe these topics should be merged?

[tungpham]

On 1/31/2025 at 11:19 PM, SAM1626 said:

Does anybody else absolutely love lego Pneumatics (LPE's, simple functions, etc.)? I would love for this topic to just be a thread where we can share creations made with pneumatics, hopefully I am not the only one.

I’m also a big fan of pneumatic systems. My first pneumatic set was the 42043 - Mercedes-Benz Arocs, and I’ve owned all the pneumatic sets since. My favorite set recently is the 42157 John Deere Skidder because it’s not very often that we have five large cylinders in a set. I’ve also managed to create an alternate build that utilizes all five cylinders.

Details of this alternate build have been posted here.

 

Edited February 2, 2025 by tungpham

[ord]

Has anyone noticed much higher friction in the 6L pumps compared to the old 5.5L pumps?

I ordered some 6L pumps from Pick A Brick for my compressor but the motors struggle to pump them (even with extra down-gearing), making compression slow and the batteries drain fast.

[dhc6twinotter]

On 3/21/2026 at 6:21 PM, ord said:

Has anyone noticed much higher friction in the 6L pumps compared to the old 5.5L pumps?

I ordered some 6L pumps from Pick A Brick for my compressor but the motors struggle to pump them (even with extra down-gearing), making compression slow and the batteries drain fast.

I have not noticed this, but I assume the 6L pump has more volume to push than the 5.5L pump.  It makes sense for the motor to require more force, but I'd think it would be a pretty negligible amount.

[ord]

I think the volume is the same since they both have a 2L stroke.

The new ones (for me anyway) are noticeably harder to push/pull, and I think when doing this hundreds of times per minute this becomes an issue.

[allanp]

11 hours ago, ord said:

I think the volume is the same since they both have a 2L stroke.

The new ones (for me anyway) are noticeably harder to push/pull, and I think when doing this hundreds of times per minute this becomes an issue.

They should be about the same I think. Are all your 6L pumps the same?

[ord]

They're all similar (and similar to my other cylinders). It's the 5.5L pumps that seem to be the odd ones out - moving them is almost effortless.