[HELP] Mechanical Sliding Blast Doors

[Lego Otaku]

You probably saw something similar in some sci-fi shows and moves, thick blast doors that slides in place to isolate areas. Such as when enemies are trying to infiltrate or escape, etc.

link to LDD: http://www.brickshelf.com/gallery/Lego-0taku/misc/sliding_door_theory.lxf

There should be stops that limits the door to maximum of about 6 and 1/2 studs from fully shut to open. I may need to touch up on alignment a bit but I wanted to make sure it would work. The parts off to the side is another door design that I considered but didn't use. The motor will be mounted and the walls will be built around to hide the gearing. The color aren't final either, I choose mostly grey since it's not as "loud" as colors.

I wish LDD does support gear movement then I could run the motor and test it. I guess it'd be too complex especially with unusual design of sliding doors and no rail other than bricks and tiles holding them in places.

Also if I got my math right and that motor is 380 RPM as I found on internet, then after all the gearing the door travel speed would be about 28 studs per minute or about 2 seconds per stud?

[Zerobricks]

I dont see why this wouldnt work..Just build it and try it :)

[Jeroen Ottens]

It looks like you have two doors that move in the opposite direction, right?

If that is the intention it will probably work.

[sioka]

I have used a system simlar to this many times and while you have the basic arangement right you have missed one thing that I have found is very important to the smoothness of the mechanism. Where you have the rack element across the top of the door being driven by the small gear, you need to add more of these small gears that are undriven and will rotate freely to stop the door from trying to pivot upwards and reduce the friction on the powered small gear. I normaly build my airlock doors in this style with a width of 2 studs, one half has the rack elements on it while the other has long tiles, the door is then held in its runner by the long tiles and the driven gear and its undriven counterparts.

I hope this explanation is of some use.

Edited July 20, 2014 by sioka

[jaumeBCN]

nice (I'm planning to replicate the Titanic's watertight door, and I can use a lot of this...) (actually I plan to put a clutch , release it and door goes down by gravity, engage the clutch and conect motor and it goes up, cut the motor and the door stays up by the magic of wormgear (until you release clutch)

[Lego Otaku]

Hmmm good point on second set of gears on top to keep it level. I'd still have to build one anyway but if it seems to work, good enough for me :D LDD isn't the best for fine tuning part placement or testing strength or something.

And yes I did intend to have 2 section slide in opposite direction like in some shows. You probably saw a few of them in Star Wars ANH when Luke and Hans were blasting their way back to Millennium Falcon after rescuing Princess.

[Lego Otaku]

I redesigned the set a bit:

The color is a bit closer to what I wanted. I flipped the racks sideway with some snotting and I was able to make the area a bit smaller. Also I'm using rubber band pully so clutch gear was redundant, saving me a couple dollars. I used group function to set up 2 parts of the door if you want to slide it and see how it looked. The red pieces in there are just to "lock" the door in place since there's nothing else to hold the door if I moved something. They'd get removed when I build the real one to test with.

http://www.brickshel...or_theory_b.lxf

Missing is a pole reverser and a battery, those aren't in LDD. I'd need a few years worth of otoshidama or some other financial windfall if I wanted to complete the entire project, I can only do a little at a time.

Edited July 21, 2014 by Lego Otaku