Subject:
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Two Design Problems
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Newsgroups:
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lugnet.build
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Date:
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Tue, 7 Nov 2000 07:49:17 GMT
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Viewed:
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405 times
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I am having a hard time solving two design problems related to the base I am
building.
Problem 1:
I want to use a single motor to (slowly) raise a vertical shaft (e.g., a
Technic axel mounted vertically) 8 to 16 studs. After raising the shaft to
full extension, the same motor needs to engage the shaft, causing it to
rotate. While rotating, the shaft does not elevate further. When the motor
reverses directions, it disengages from the shaft and then (slowly) lowers
it. There will be a fair amount of weight at the top of the shaft. That
is, the system has to lift a mass approximately 8 to 16 studs, rotate that
mass, and then lower it by reversing polarity, all using a single motor. Is
this doable? If not, is it doable with two motors, or one motor and one
micromotor, or by some other means I have not considered? The important
think is that the system work by remote control without any sort of
precision control by the operator.
If possible, the cross section of the housing should look something like
this ('XX' denotes where I was seating the motor in my building trials):
| XX |
------ ------
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--------
Problem 2:
I want to build fully functional (i.e., motorized) landing pads a la Space:
1999. A given landing pad needs to measure approximately 70 studs by 70
studs and lower into a housing 15 to 20 bricks deep (or even deeper). After
the pad lowers approximately 10 studs, doors need to slide in from under the
deck to close off the hole left by the cross shaped portion of the landing
pad that descends to the hanger level. All of the machinery must reside
below the landing pad, but size of said machinery does not really matter. I
think some sort of pulley system would probably work best but I cannot think
of anything that will support the weight and remain stable.
Thanks in advance for any and all advice and/or suggestions.
-D
--
^V^^V^
I am: Damraska@Excite.com
Minifig Suns: http://pages.prodigy.net/damraska/
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Message has 2 Replies:
 | | Re: Two Design Problems
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| (...) I would mount your rotating axle on an upright micro-motor. Then, stand the micro-motor on a base which you raise and lower. The axle could go up through a hole in a technic plate if you want to hide the mechanism underground. This brings us (...) (24 years ago, 7-Nov-00, to lugnet.build)
| | | Re: Two Design Problems
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| Damraska skrev i meddelandet ... (...) Not tested at all, just an idea, sorry for my lack of English: Use a worm drive (is that the right word for the 'screw' gear?) and straight cogged pieces (word?) to do the raising. When the cogged pieces are (...) (24 years ago, 7-Nov-00, to lugnet.build)
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