has the 40t gear been discontinued?
Posted 30 April 2012 - 10:29 PM
p.s. i'm not going to pull this punch: bevel gears suck.
Posted 30 April 2012 - 10:45 PM
When I was a kid I got one 40T red on a silly bioncle set and I thought it was the coolest thing ever. When I came out of my dark ages I still thought they were cool so I started to try and collect as many as I could. I easily have over 300 of them (in various colors) including over 40 black ones!
Posted 30 April 2012 - 10:50 PM
2010 sets... well the gear is still in production... and is a very good gear for reductions 5:1
Edited by parda, 30 April 2012 - 10:51 PM.
Posted 01 May 2012 - 05:13 AM
that one element speaks of lego precision like no other, imho.
i omitted mention of that one because it's a mail-order supplemental set, but, yeah, it does have four of them, and i suppose it's fair to consider that set as still available, as opposed to the shuttle and the cycle. still, 'been two years....
Edited by KEvron, 01 May 2012 - 06:06 AM.
Posted 01 May 2012 - 05:35 AM
no, but i've compared their masses, as reported at bricklink, and i've found that the bezels are heavier than their spur gear counterparts; 12t weighs more than 16t, 20t weighs more than 24t, etc. superfluous mass can really have a pronounced effect.
you have to get jiggy with the axle hole layouts, but i've found some pretty good meshes for most of them. for 20:8, i like to use two 20t half-bezels, face-to-face. makes a kind of a cage gear. very smoothe.
no, my main gripe with them is that tend have a sloppy fit on the axles, and in that regard, they can be tough to align. poor alignment can really have a pronounced effect.... heh! the half-bezels are worse than the doubles, but they're both worse than the spur gears. spur gears are easier to align, too. usually fall right into place.
and they rub. i can get away with eliminating a bush between a spur and a technic brick, but bezels will rub.
and they're plain ol' ugly. spurs have style.
Edited by KEvron, 01 May 2012 - 11:07 PM.
Posted 01 May 2012 - 05:37 AM
Speaking of bevel gears, I have noticed that the Black 20t bevel gears don't seem to mesh quite as nicely with the 12t Bevel gears as the tan ones do...
Posted 01 May 2012 - 05:48 AM
no, i didn't pursue it that deeply. i'm up to the gills in them, myself, so lego direct didn't occur to me. they tend to keep an educational supplemental set available, so i wouldn't know how to interpret a positive response from them.
to be honest, i've been hoping beyond all that they'd give us at least one more round of color palette gears. the gear's continued absence from the theme only further dashes those silly hopes.
Posted 01 May 2012 - 05:54 AM
That gear has been around since the 70's, so I don't expect it to go away anytime soon...
It comes and goes every few years...
Posted 01 May 2012 - 07:38 PM
like i say, i've got enough of them to last 'til perdition. i just see it as a bad omen.
it'd be nice for them to occasionally release a round of color palette gears, like they did with the slizers. if they were to mix the color choices right, people like me would buy the entire line just to complete the palette (i've got a project in mind that would make use of the various color gears, but it depends on using at least one - two would be better - blue 40t gear, which don't currently own and, considering the asking price at bricklink, i likely never will).
Posted 01 May 2012 - 08:43 PM
You call them ugly, I call them functional. You're just not used to them. They do what they need to do, and they do it very well.
Posted 01 May 2012 - 10:42 PM
the two are not mutually exclusive. to wit: the 40t spur gear is both.
a rather hasty assumption, and one that doesn't change the fact that they're crap compared to the fine precision and sleek styling of the original spurs.
Edited by KEvron, 01 May 2012 - 11:04 PM.
Posted 02 May 2012 - 11:03 AM
It's nice to see you agree with my two other points.
Edited by mahjqa, 02 May 2012 - 11:05 AM.
Posted 02 May 2012 - 11:46 AM
Edited by Erik Leppen, 02 May 2012 - 11:46 AM.
Posted 02 May 2012 - 01:09 PM
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Posted 02 May 2012 - 11:35 PM
i wouldn't mind that, either. a better fit on the axles would be nice, too.
have i unwittingly stumbled into youtube? *snort!*
i would think the 24:8 is stronger arrangement, owing to their smaller diameters.
those holes complete the element. a million and one uses!
i'm not following you, zeeb; do you mean the other + holes on the gear, itself?
Edited by KEvron, 02 May 2012 - 11:36 PM.
Posted 03 May 2012 - 01:05 AM
generally, personal opinions are not subject to refutation. i addressed the points i wanted to address; was there something more you wanted to say, yourself? don't be shy.
not on my end. it's a beautiful part. the quintessential technic element, imho.
Edited by KEvron, 03 May 2012 - 06:17 AM.
Posted 03 May 2012 - 01:38 AM
It has it's uses, so I hope LEGO doesn't get rid of it, but like Paul said, there are plenty on Bricklink.
Edited by dhc6twinotter, 03 May 2012 - 01:41 AM.
Posted 03 May 2012 - 06:14 AM
bricklink is for afol geeks like us, not the general public.
who'd have thought such an innocuous observation would elicit contention?!
....but yeah, it's fun.
ah, i wasn't aware of this. could you explain?
but the masses are substantially different; 36t weighs 3.5g, 24t weighs 1.14g.
Edited by KEvron, 03 May 2012 - 07:18 AM.
Posted 03 May 2012 - 07:11 AM
But larger diameters give less friction. (everything else being equal)
Less friction (at constant torque) seems to be correct, as the contact forces are much smaller on each tooth (and the more contacting teeth can't compensate that).
I may be wrong though, studies about gears were long ago and I didn't really think it over...
EDIT: I'm not sure about the friction thing now, as the friction force is smaller, but acts on a bigger radius. I guess other factors come in to play when calculating friction torque.
(Morning=no habla england)
On topic: I have never had the 40 teeth gear, but I always wanted one. It looks awesome.
Edited by Lipko, 03 May 2012 - 07:19 AM.
Posted 03 May 2012 - 07:37 AM
okay, i get that. by dispersing the sum force over more contact surface, the gear teeth are able to better withstand the force.
...but you don't get something for nothing, right? the greater the diameter, the more input power required to overcome the torque. wouldn't proportionality come into play?
the friction stuff is (even further) over my head. studied mu factors and all that in high school physics, but that was more than a dark age ago.
oh, you need to get on that! a bag of 25 will run you $10 at legoeducation (u.s.).
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