Pin without friction and without play

[oracid]

Here is a type of video that is unusual for me. I had so much trouble with the play of the pins that I have wanted to wring my neck out with this problem.

 

[jorgeopesi]

It is a good idea, even being purist with a pair of cuts you gain strengh without spoil the piece, Lego will do that pin...

[Jurss]

Didn't checked, but if this is inserted in frictionless pin  https://rebrickable.com/parts/30374/bar-4l-lightsaber-blade-wand/

maybe then that play maybe is reduced?

[gyenesvi]

Nice idea, I have also been wondering how nice it would be to have a pin with one end frictionless and the other with friction. But it probably does not exist because you would have a hard time distinguishing which one is which :) Just like you'll have a hard time telling these modified pins apart from the unmodified ones.

On the other hand, I realized that something like this does exist in lego, the frictionless axle pin:

The axle end is a strong connection, the other one is frictionless, which is better than both ends being frictionless. It is often used it in steering rigs to reduce play.

  On 11/22/2021 at 8:34 AM, Jurss said:

Didn't checked, but if this is inserted in frictionless pin  https://rebrickable.com/parts/30374/bar-4l-lightsaber-blade-wand/

maybe then that play maybe is reduced?

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You can't put a bar through that one, the hole is narrower in the middle section.

[oracid]

  On 11/22/2021 at 8:34 AM, Jurss said:

Didn't checked, but if this is inserted in frictionless pin  https://rebrickable.com/parts/30374/bar-4l-lightsaber-blade-wand/

maybe then that play maybe is reduced?

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The 32556 or the 3673 is not elastic in the center because they are not cuted. As a result, even though I don't have this piece you show me, I doubt its action.
One of the advantages of pine 2780 is that it is cut in the center, this makes it elastic.

@gyenesvi, Unfortunately the pin axle 3549 is not usable in all situations.

Thank's all.

[Erik Leppen]

  On 11/22/2021 at 9:00 AM, gyenesvi said:

the frictionless axle pin:

The axle end is a strong connection, the other one is frictionless, which is better than both ends being frictionless. It is often used it in steering rigs to reduce play.

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I often use a blue axle pin connecting 2 pinholes without friction in such cases. If there is no risk of the pin falling out (i.e. it is locked in place), then this is the perfect frictionless connection with little play. It works perfectly, without any modifications.

[gyenesvi]

  On 11/22/2021 at 9:06 AM, oracid said:

Unfortunately the pin axle 3549 is not usable in all situations.

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That is true, I only meant situations where you have an axle hole at the end of one of the beams you want to connect.

  On 11/22/2021 at 10:24 AM, Erik Leppen said:

I often use a blue axle pin connecting 2 pinholes without friction in such cases. If there is no risk of the pin falling out (i.e. it is locked in place), then this is the perfect frictionless connection with little play. It works perfectly, without any modifications.

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That's also an interesting usage, in a way the opposite of what I meant (I meant putting the axle end into an axle hole, and using the other end as frictionless, while you use the axle end as frictionless connection).

[Lipko]

  On 11/22/2021 at 10:24 AM, Erik Leppen said:

I often use a blue axle pin connecting 2 pinholes without friction in such cases. If there is no risk of the pin falling out (i.e. it is locked in place), then this is the perfect frictionless connection with little play. It works perfectly, without any modifications.

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I use this all the time if applicable.

[Mr Jos]

I had to close my eyes when you were cutting towards your own hands 

But I do understand why you made it. Like said before the one part  cross, one part frictionless can't be used in many cases. Recently I made a scissorlift (long liftarms, so no axle holes). It's very wobbly because of the play in the pins. I have been thinking about changing them to normal friction pins as the power from the linear actuator should be enough to overcome it. After long use it might become the same as your modded pin.

 

[Erik Leppen]

Use axles :) It's often stronger (less play) than frictionless pins.

You could also use the 3 long black axle pin (pin-axle-axle) and a bush on the axle end to hold the beam in place.