Subject:
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modified 4185s
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Newsgroups:
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lugnet.technic
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Date:
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Thu, 20 Nov 2003 20:16:01 GMT
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Viewed:
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995 times
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I'm currently working on a project that needs a lot of Technic Wedge Belt
Wheels (4185) that can freely spin. I realize that modifying Lego parts is
a sin. But other people such as TJ Avery have done this modification. So
i thought that it would be ok as long as i did the modification the correct
way. The following pictures show the end result, the intended use, and the
process used to do the modification.
the pictures can be found on
brickshelf: http://www.brickshelf.com/cgi-bin/gallery.cgi?f=63718
pictures IMG_4283 - IMG_4298 show the process used to mill out the
centers. a milling machine was used so that the centers would be as
accurate as possible. How lucky am i to have access to a milling machine
at work! since i had a lot of pieces to mill i needed to make a jig that
would allow me to swap the pieces rather quickly without re-centering every
piece. i used some sacrificial technic bricks and 2 technic pin long with
friction. the 4185 does not set completely flat because the center is
slightly taller than the outer edge. so the area between the 2 pins on the
technic brick was shaved down a little to allow for the center of the 4185
to set slightly recessed. (i know another sin) A 3/16ths 4 fluted hardened
steel milling machine bit was used. the centers are just right for an axle
to rotate snuggly. i'm hopping that after the holes are debured that they
will spin more freely. the centers are milled using 4 shallow plunges
rather that a single get it all in one shot plunge. this was done to allow
the refuse to clear form the bit and so that the plastic would not over
heat and possibly warp. (i wanted round holes not oval)
pictures IMG_4271 - IMG_4274 show the final product. You will notice that
they have not been debured yet. i will probably use an exacto knife to do
this.
pictures IMG_4275 - IMG_4275 show my intended use. the hook design is
shamelessly copied form TJ. I just don't think that i could come up with a
better and stronger design. Hope you don't mind TJ?
i'm very please with the results. was it over kill? probably. why did i
not use a drill press or a hand drill? hey, i just wanted to learn how to
use a milling machine, ok.
Bob Kojima
bob@fial.com
http://www.bong69.com
http://www.partscatalog.da.ru
Bob Kojima
ko@fial.com
http://www.bong69.com
Fial Incorporated
Telecom Monitoring Solutions
4343 SW Corbett Ave
Portland, OR 97201
503.227.7083
http://www.fial.com
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Message has 3 Replies:
 | | Re: modified 4185s
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| Or, you could have used this part: (URL) so it's not as thin as the wedge belt wheel. I see you grew quite fond of taking pictures of this sinning in the mill. I'm sure Pixel will cry when he see them *evil grin* Are you building an airplane? :) (...) (21 years ago, 21-Nov-03, to lugnet.technic)
| | | Re: modified 4185s
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| (...) ideas. Your mod to the pulley is quite interesting. Let us know how the bored-out wheels perform. It could be a better method than using a drill press. I've had many problems with using a press and not getting the drilled hole to line up (...) (21 years ago, 21-Nov-03, to lugnet.technic)
| | | Re: modified 4185s
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| (...) When I read this I somehow got the idea you would use LEGO as the tool for modification, as this would then be a "politically correct" modification. (For example using a metallic axle piece like in (URL) Jürgen Stuber <stuber@loria.fr> (URL) (...) (21 years ago, 22-Nov-03, to lugnet.technic)
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