Subject:
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Re: 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 20:26:49 GMT
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Viewed:
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441 times
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Damraska skrev i meddelandet ...
>
> 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.
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 raised to
the top by the worm, the normal gear engage the axle, and the worm 'slips'
(not the right word).
You probably need to balance out the weight a bit, strings and pulleys and a
counterwight somewhere should fix that.
Trying to draw, fixed font recommended:
| | XX
--- | -|-------- top plane, motor
| === gear
| |
--------|- | 'bottom' plane, with axle
| ===== | cog, gear
|> |
|> | |
|><|> | cog, worm
|><|> |
|><|> |
|> | |
|> | |
| |
===== ======= gear, gear
You're not saying anything about size, and how much 'hidden' space there is,
so I don't know if this is a feasible solution, although it should work,
technically.
> 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.
The same method as above for raising and lowering, and then a gear train (plus
strings, pulleys perhaps) for the sliding doors. You might have a problem with
the load on the motor here, perhaps two or more in parallell are needed.
Just my SEK 0.02
--
Anders Isaksson, Sweden
BlockCAD: http://user.tninet.se/~hbh828t/proglego.htm
Gallery: http://user.tninet.se/~hbh828t/gallery.htm
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Message has 1 Reply:
 | | Re: Two Design Problems
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| Anders Isaksson <isaksson.etuna@REMO...tninet.se> wrote in message news:G3oBM1.4MI@lugnet.com... (...) to (...) motor (...) lowers (...) straight (...) to (...) a (...) is, (...) Anders, that's perfect. Your mock-up is similar to what I already (...) (24 years ago, 9-Nov-00, to lugnet.build)
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Message is in Reply To:
| | Two Design Problems
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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 (...) (24 years ago, 7-Nov-00, to lugnet.build)
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