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Old Feb 23, 2003, 09:35 PM
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Inside Story - February 2003




Inside Story - February 2003

By Graham Stabler

This month, Graham and crew are back a very large, six section column. (Actually, it is a column, a tip section, and four mini-articles.) It starts with an in-depth discussion about motor constants, which has more hard-core equations than any EZone article, and then moves on to articles on actuators, servos, receivers, and a section devoted to building a cheap wattmeter, "Rapid Prototyping in the Microwave", and finally, and "LiPoly Voltage Monitor". new
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Old Feb 24, 2003, 01:04 AM
del is offline
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Grahm.
Good work on the latest Inside Story.
Cudos to all.

But, hey, can ya get the E-Zone folks to pump up the font size?
I'm gettin' radiation burns from moviig my face so close to
the CRT, and neck cramps from tilting my head back to bring my
trifocals into action...

As for home-brewed props, ya might wanna aim folks at my web page:

http://n-lemma.com/indoorrc/propcalc.htm

I include a bit of the math behind carving a prop form.

--del
Old Feb 24, 2003, 11:31 PM
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In the article on servo lightening I wrote I didn't know the weight of the motors in the HS50 and Pico servos. Thanks to Matt Keennon I now know. The smaller motor in the HS50 weighs 0.40g less. So, that is what accounts for the HS50's lighter weight once everything else is lightened. There may be some wire differences and moldings, but that is probably most of it.

Gordon
Old Feb 25, 2003, 10:02 AM
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Quote:
Originally posted by del
Grahm.

But, hey, can ya get the E-Zone folks to pump up the font size?
I'm gettin' radiation burns from moviig my face so close to
the CRT, and neck cramps from tilting my head back to bring my
trifocals into action...
--del
That's one of the *main* reasons I use the Opera browser (www.opera.com). You can download a free (advertising) version. Works on 99% of websites. I only use the (slower, big fat) I.E. for sites that Opera can't handle.

To increase /decrease the fonts (up to 1000%), you just hit the
NUMPAD +/- keys.

As I'm getting older , and had to recently start using reading glasses, many web sites are unreadable for me without, which I prefer not to wear if I don't have to.

Mike
Old Feb 27, 2003, 04:20 PM
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Hi,

Netscape 7.x lets you zoom up the fontsize quite easily.

Included you will find a spreadsheet with the formulas of my motor constant article. It works with MS Excel, MS Works and OpenOffice. The data in the spreadsheet are from a pager motor, but you can easily put in your own measurements.

Regards, Jochen
Old Feb 28, 2003, 02:28 PM
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I'll put that in next months column as well, I forgot all about it this time around.

Graham
Old Mar 16, 2003, 05:39 PM
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Hi all,

I have been asked for an example of my formulas with real values so that everybody can follow the formulas more easily without having practice in math stuff. So, here is a pdf file of all the formulas with all the values of the KP00 motor in it.

Find the file here.

Regards, Jochen
Old Mar 17, 2003, 08:15 AM
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Jochen,

Thanks much for the extra effort to an already excellent article.

Dave Wulff
Old Mar 17, 2003, 09:44 AM
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Great article, thanks for sharing!
Old Mar 17, 2003, 10:55 AM
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Jochen,
Thanks. Your article is what I've been reading among other things on my train ride to get ready to estimate constants for some newer micro motors.

Gordon
Old Mar 17, 2003, 05:54 PM
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I have been missing articles like The Inside Story in Ezone for a while.

What a chance to learn more and get new ideas!

Congratulations

Hans


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