Saturday, November 11, 2006
Lego Axis Update!
I've built the (Lego) supports for the Lego Axis, and mounted them to a board. I mounted the motor to the front support with Legos and hot glue, and then attached pair of limiter switches to either end. I used electrical tape to tape down a set of '1x flat' legos to the board, and then just stacked the rest of the bricks ontop of that.
To get enough movement out of it, I had to raise the 'platform' so it would clear the support on the far end. The motor/wires/etc are too much of a liability on the near end, so I built the (grey) limiter stop out on the end; the far side uses the (black) support piece as the limiter stop. The switches are the black plastic pieces on either end (in the top black Technic piece on the near end, the top red Technic piece on the far end) with the 'metal tab' coming out of them. The connectors on the limiter switches are spaced just right to fit perfectly into three technic holes (using the first and third for the ground and 'usualy closed' leads)
Here are pictures of the motor mount, made out of legos. I just extended out from the near support and built up some blocks.
I then hotglued the motor to the legos (didn't feel like trying to drill into my legos, and the hot glue seems to work just fine!)
There's still a little wobble, but it's reduced quite a bit, and the wobble is actually more in the supports/motor than the carrage itself. I also know I'll be able to reduce a lot of that wobble once I get a decent connection between the motor and the threaded rod! (currently just electrical tape that mostly holds in a generally straight manor... hot glue didn't work and I haven't gotten around to getting any CAPA or anything else)
I'd avoid attaching stepper motors directly to CAPA - they get very hot and melt the mountings away!
I don't have enough legos to make the whole thing out of them right now, so it's just this axis for the time being, but my design for the rest could probably be done in legos, and I plan on revisiting that later. I've just got too many ideas/subprojects I'm working on, and not enough time or legos! I'd like to eventually make one entirley out of legos, and see if I can't come up with some lego-style instructions for it...
***A very interesting approach. Mind if I use the photos in my RepRap presentations?***
Go right ahead. I know one of the pictures is blurry; I'm planning on retaking that when i post on the rest of it (after i get the circuit board wired up to run all three axis at once later this week(end)...) I'll also post video of all three axis in motion at that time as well.
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