Special:
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[DAT] (requires LDraw-compatible viewer)
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Subject:
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Re: Size of electric plugs (4.5 / 12 V)
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Newsgroups:
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lugnet.cad
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Date:
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Tue, 24 Dec 2002 21:46:21 GMT
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Viewed:
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726 times
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In lugnet.cad, Steve Bliss writes:
> In lugnet.cad, Niels Karsdorp wrote:
>
> > I decided to finish the lightbricks (2x2) I have started
> > a while ago. When comparing the socketholes with those used
> > by the 4.5 Volt technic motor 6216m.dat and the plug 766c01.dat
> > I noticed that the size of the metal plugs in part 766c01 are
> > too big to fit in the socket of motor 6216m.dat.
> > Is either the motor modelled too small or is the plug modelled
> > to large?
> > When I measure the size of the socketholes of my 'new' lightbrick
> > I measure 2.8 mm, which is 7 LDU, thus a radius of 3.5 LDU.
> > That matches with those of the motor 6216m.dat.
> > With 'new' lightbrick, I mean the version with three holes, the
> > same kind of socket as the motor has.
> >
> > I have also some older lightbricks (2x2, not the very old 2x4 from
> > the fifties or sixties) with metal borders through the holes.
> > These holes are 2.4 mm wide, which is 6 LDU, a radius of 3 LDU.
> >
> > Shall I use the correct measurements?
> > (And have the plugs never fit inside ;-) ?
> >
> > Niels
> I don't have most of these pieces, so I can't really say what's measured
> correctly or incorrectly.
>
> But in this case, I think you should use the correct measurements.
>
> Steve
I do have these parts, but I'm confused by your statement of incompatibility.
The pins on the plug (s\2775s01.dat) are modelled with a diameter of 7LDu.
The pin holes in the end of the motor (s\6216mb.dat) are also modelled with a
diameter of 7LDu.
If you render this
1 16 0 0 0 1 0 0 0 1 0 0 0 1 6216m.DAT
1 16 0 25 72 1 0 0 0 1 0 0 0 1 766c01.dat
you should still see the edge of the motor pin hole around the partly inserted
plug.
Note that the pins do step down in diameter from 9LDu within the the holder to
7 LDu for the insertable section.
Taking another look at these parts (I have the plus, motor, and both types of
2x2 light brick) I see this.
- The pin holes in the motor and the 3-hole light brick are 7LDu, but the
internal metal part that actually grips the pin (and conducts the electricity)
is slightly smaller.
- Measuring the plug pins with a micrometer (and trying not to compress the
springiness in them) I get between 0.102 and 0.103 inches ~= 6.528 to 6.592 LDu.
- The metal-edged pin holes in the 2-hole light brick are slightly smaller than
7LDu, but NOT as small as 6LDu. Indeed they cannot be this small or the ~6.5LDu
pins would not fit into them - which they do. (I measure an outer diameter of
the metal socket at 10 LDu.)
For consistency and interoperability I think we can model all 4.5V/12V pins and
pin holes with a diameter of 7LDu.
Chris
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Message is in Reply To:
 | | Re: Size of electric plugs (4.5 / 12 V)
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| I don't have most of these pieces, so I can't really say what's measured correctly or incorrectly. But in this case, I think you should use the correct measurements. Steve (...) (22 years ago, 24-Dec-02, to lugnet.cad)
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