Subject:
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Re: Video of Cable Shovel In Action
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Newsgroups:
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lugnet.technic
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Date:
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Mon, 3 Oct 2005 17:41:17 GMT
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Viewed:
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4232 times
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In lugnet.technic, danny staple orionrobots@gmail.com wrote:
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On 30/09/05, Benjamin Ventura generaldisarray2005@yahoo.com wrote:
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In lugnet.technic, danny staple orionrobots@gmail.com wrote:
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Most of the noise is coming from the ‘crowd’, the part that pushes the
bucket
back and forth. It uses a bunch of 40, 24 and 8 tooth gears to do it’s
thing:
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=1401966
And they make a ton of noise, the gears. The motors there do not have
built-in
gear reduction, so i had to build my own transmission.
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Cool. Could you get less noise and a reduction in space using a worm
gear? I seem to remember them being less efficient, but they would
give good reduction, and should lower the noise considerably, although
they may require placing motors perpendicular to the output shafts.
Danny
--
http://orionrobots.co.uk - Build Robots
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I probably could reduce bulk and noise by using worm gears, but at the time I
built that part of the machine I only owned two worms and I needed them in
other
places. The ‘crowd’ has two motors and transmissions and I had already used
one
worm gear in the bucket’s jaw..
However, I really like the noise. The machine is big, and the transmission
chattering helps give it an even “larger than life” feel. The hoist is even
better, it has four high-speed motors and transmissions inside of the house
(the
red and white body part). Having all those motors and gears inside of a big
hollow space makes a really cool, deep noise that echos around inside and
sounds
great. But you can’t hear that sound in the video, the upgraded hoist is new
and was in a different configuration at the time of the video’s filming.
On a different subject I have been starting a new project, a drilling rig. I
want to make something like this:
or an offshore oil drilling platform.
I really enjoy building models that are functional, so I want to make one
that can actually put holes in the ground and lay pipe. I have built a
prototype drilling attachment that I think will work, I will post pictures
ASAP.
-Ben
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Ah - understandable. I actually stocked up on them from bricklink, as
I so often found them useful. I admit - I tend to agree with you on
the noise making it “larger than life”. Any chance of videos of the
upgraded hoist then?
One other thing - how are you controlling it? I see the huge battery
and counterweights, but what have you got at the other end of that
bundle of control cables?
I am looking forward to the drilling rig - laying pipe as well means
you might even build a small functional Lego TBM - cool.
Danny
--
http://orionrobots.co.uk - Build Robots
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Re: control, I am using switches and a project box that I purchased at
radioshack. Unfortunately this does not allow for proportional control of
machine functions, it is bang-bang. You can see the tethered remote in the
first two pictures in this gallery:
http://www.brickshelf.com/cgi-bin/gallery.cgi?f=123410
So control is basically an aluminum box with a bunch of 3 position, 6 pin
switches on it (forward, off, reverse).
I will get video of the digging action with the new hoist powerplant.
I think a tunnel boring machine would be an awesome lego project, that is up
there on my list of things to build. I think the ultimate project would be a
working giant bucket wheel excavator.
I don’t have pictures of the prototype drilling rig yet but I’ll get some soon.
Over the weekend I made some progress there: I build a clamp-like lego
structure, that has motorized wheels on the inside of the clamp’s fingers. I
then put a 1/4 inch diameter threaded steel pipe in the clamp. For the drilling
bit, the pipe has an adapter to fit a wider pipe at the bottom, and I used a
dremel to cut 4 teeth into the bottom of the adapter. Then I hooked up a garden
hose to the top of the pipe (with a swivel adapter allowing the steel pipe to
spin, but the hose stay still), turn the clamp’s wheels on, and stuck the thing
on some dirt.
So, the motor-clamp turns the drill pipe, and the water from the hose comes down
the drillpipe & out the bit, and is supposed to remove the material after the
bit cuts it.
It kind of works.. there are problems with friction but I think if I keep at it
I can really get it to dig. Stay tuned!
-Ben
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Message has 1 Reply:
 | | Re: Video of Cable Shovel In Action
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| (...) Ah - now you have pointed it out I see it. I am not a Lego only evangelist, but there is scope for it to be replaced with some Pole Reverser switches and a Lego frame. I am wandering if an RCX could be used with it, to automate it for fun. I (...) (19 years ago, 4-Oct-05, to lugnet.technic)
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Message is in Reply To:
| | Re: Video of Cable Shovel In Action
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| (...) Ah - understandable. I actually stocked up on them from bricklink, as I so often found them useful. I admit - I tend to agree with you on the noise making it "larger than life". Any chance of videos of the upgraded hoist then? One other thing (...) (19 years ago, 1-Oct-05, to lugnet.technic)
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