How to modify a LEGO pneumatic switch for optimal air flow by Techbricks.nl

http://www.techbricks.nl made a video about how to open and modify a LEGO pneumatic switch (part no: 4694) for a optimal air flow.
After removing the back plane of the switch, 3 pieces of plastic (that defined positions of the switch) must be removed. By removing this, the switch can now easily be moved back and forth. Then the nuzzles (inlet and outlet) are drilled up to 2mm diameter. All the detrimental plastic particles and old glue residues are removed (cut away) in order to fit the back plane to the switch body smoothly. Finally the switch must be cleaned with compressed air, the parts are lubricated and the back plane of switch sealed with epoxy glue to the switch body. Using this switch in a LEGO pneumatic engine (LPE) results in a much faster moving piston.
Click here to see more info: http://www.techbricks.nl/My-pneumatic-LEGO-projects/how-to-modify-a-lego-pneu...

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Education

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• nozzle
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• inlet
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• drilled
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• back
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• epoxy
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• compressor
• compressed
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• optimized
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• drilling
• LPE

[Symnogtx]

I know that modified switches leak a bit, but si it possible to modify them without leaking?

[techbricks]

@Symnogtx : check my techbricks dot nl web site for more info.

[SpeedyGonZohan]

Now on your website you say you use a glue that you mix up yourself (for re-sealing teh back plate on) An at 8:31 you say use an Epoxy. Which one do I use?

[techbricks]

@SpeedyGonZohan : I use epoxy glue. Before glueing you must mix the two components of the glue.

[ofcadoneghe]

Do you cut also the pin in order to remove the back plane?

[techbricks]

@ofcadoneghe : Sure you can, but I alway try not to break ik at all. But that doesn't happen very offen.....

[rocketman468]

THANK YOU!! just what i wanted :D

[japsujipsu]

show what is the difference

[funes79]

I tried this but the switch leaks. So I do not recommend to open the switch, just to drill bigger holes which will help the airflow. I dont know how they assemble the switch in Lego, but they have to create an extreme force to push the lever when they glue it.

[TheTrainguy10]

quick question, will this modification work with the other version of switch? cause my switches leaked after modification. PS: i know your website lol

[subtotal17]

HOLY JESUS, your hands are sHaKiE

[ruben4884]

i have a big problem. i can't open it. do you now why? do you sell them?

ruben wynia

[usernamen0tfound]

Thanks for the video, my engine wont run without this.

[SMGJohn]

I cut my finger off. Is this suppose to happen or maybe I was just to careless??

[WorldofMindstorms]

If you modified your switch and cylinders but also needed a T split in between, would you need to modify that as well to keep the speed?

[ruben4884]

I build a motor to and I want 4 modified switches but I can't open it. can i maybe buy it ? I have 3 switches but i don't now if it the right one.

ruben.

[Buemmo]

i used this to get my pneumatic locomotive working and now it finally does! Thx a lot!

[Jackcabbit]

A small tip: Nail clippers are surprisingly effective on legos.