Build Linear Actuators

[Mats_o]

I have tried using a worm gear and gear racks But i cant get it as stable as I want it.

There was on verion on the net but that design was to tight (to much friction on the parts).

The cheat way is to do something like the the threaded version that Jennifer clark used on her white crane

I would need something capable of extending 12-16 studs.

[backbone]

http://www.brickshelf.com/cgi-bin/gallery.cgi?i=1172664

http://www.brickshelf.com/cgi-bin/gallery.cgi?f=448954

Some ideas. Look for 2-section crane boom ideas too.

[Milan]

The best and strongest design is this (from Erik Leppen's gallery, but Swissbager had one built long time ago, don't know who made it first):

I made even smaller and equally strong actuators here:

You can make the ram as long as you want in both cases shown.

Edited October 12, 2011 by Milan

[dhc6twinotter]

The best and strongest design is this (from Erik Leppen's gallery, but Swissbager had one built long time ago, don't know who made it first):

That is a good design, and I used a similar setup on my backhoe. It works well, and it is quite srong.

[Follows Closely]

...

I made even smaller and equally strong actuators here:

...

Can you show us your design?

[Mats_o]

Can you show us your design?

+1 :)

They look very interesting

[Countdown]

+1 :)

They look very interesting

I second that, can't tell your design from your BS gallery

[timslegos]

The best and strongest design is this (from Erik Leppen's gallery, but Swissbager had one built long time ago, don't know who made it first):

I made even smaller and equally strong actuators here:

You can make the ram as long as you want in both cases shown.

So your the genius behind the excavator?!? I loved looking at your excavator as inspiration! Please post photos of the custom LAs!!

tim

[Milan]

So your the genius behind the excavator?!? I loved looking at your excavator as inspiration! Please post photos of the custom LAs!!

tim

If you mean this bigger JCB yes, i did it.

There is one much smaller, but i used normal LAs there.

I dont have MLCad file for this brick builtLA on this computer i am using now, will post it later, but i hope this video can help you a bit:

http://www.youtube.com/watch?v=kI-o7h7Uh9o

[beelzibus]

If you mean this bigger JCB yes, i did it.

There is one much smaller, but i used normal LAs there.

I dont have MLCad file for this brick builtLA on this computer i am using now, will post it later, but i hope this video can help you a bit:

http://www.youtube.com/watch?v=kI-o7h7Uh9o

I too would be very very interested in some more details on these, they look excellent. Good work.

[Alasdair Ryan]

Milan if you like you can send me some pics and i can make a cad file of your actuators.

[timslegos]

Milan if you like you can send me some pics and i can make a cad file of your actuators.

yes please!!! . I am very interested in the design.

tim

[Mats_o]

I have made a prototype of a smaller actuator.

the main benefit is that it's only three studs wide.

Is it done? nope

Can it be improved Absolutly

[timslegos]

nice concept!! Is it strong enough to hold a significant load?

tim

[Mats_o]

Since it's still a prototype it hasn't been tested in a modell yet but it feels fairly strong.

It might not be the best for the heaviest loads though but since it's smaller you can always use two :)

[timslegos]

It looks good. i will build one as well and see how it does.

tim

[Alasdair Ryan]

I will build one too, just for the fun of it.

[Mats_o]

One thing that remains to be resolved is to do the back end of it.

How can that be done the best way?

There is something for you to think about :)

[Alasdair Ryan]

Here is my best linear actuator concept.

I have made a lxf file below so you can build it yourself Ldd did not have the small rack's i used. (if i had know that i would of used a different cad software)

Edited November 5, 2011 by Alasdair Ryan

[timslegos]

Very nice prototype! How would you attach it to a machine though?

tim

[Alasdair Ryan]

I think this should work ok,By using universal joints you could have the motor somewere else.

*I used a 5 axle by mistake replace this with a pin with out friction on ether side.

[SNIPE]

Hi,

I was busy building a linear actuator that had a very sentive stroke as the teeth are very small,

I used a tooshed bar from the monirail set and the winding drum that has the axle hole and teeth on the end

I used the technic beam sleeve/channel and attached the tooched bar onto a technic beam then put it through thatb channel.

However when I get to a certain point in buildig it lego diigital desighner CRASHES due to part incompatibiltiy.

The whole model would be quite thin with a stroke of about 11 or 13 holes of the beam

Edited November 7, 2011 by SNIPE

[Alasdair Ryan]

Hi,

I was busy building a linear actuator that had a very sentive stroke as the teeth are very small,

I used a tooshed bar from the monirail set and the winding drum that has the axle hole and teeth on the end

I used the technic beam sleeve/channel and attached the tooched bar onto a technic beam then put it through thatb channel.

However when I get to a certain point in buildig it lego diigital desighner CRASHES due to part incompatibiltiy.

The whole model would be quite thin with a stroke of about 11 or 13 holes of the beam

Snipe you could send me some pics and i could do a cad file for you if you want.

[SNIPE]

I will try to ASAP

The desighn it pretty good because there is little gap-torerence inbetween the parts which makes it robust. this is down to the technic beam runner brick mainly, the gear rack strips are attached down well too as well as the tiny 30 tooth gears

As we know , when the 'nuts and bolts' are not done up properly bad things happnen..

Edited November 27, 2011 by SNIPE

[SNIPE]

here is the pictures adn LDD file incase others want to see it, it was PM'd prior.

here is the LXF file :http://www.brickshel...ar_actuator.lxf

Edited November 27, 2011 by SNIPE