Comments on: 3 Studs Wide Differential Lock

By: Sariel

Sariel — Thu, 30 Dec 2010 23:38:12 +0000

@Skel No, there is no kind of movement you're referring to. The gears that sit on both sides of the differential are exactly 1 stud wide both, so there is no space for backlash. If you used 8-teethed gears instead, that would be quite a different story.

By: Skel

Skel — Thu, 30 Dec 2010 23:10:53 +0000

@Skel Consider the last question as obsolete, I found the hellbender model page with enough explanation

By: Skel

Skel — Thu, 30 Dec 2010 23:06:52 +0000

@Sariel

play as in any movement of the lego diff other then the intended rotational movement.

So in this case the diff is supposed to rotate around the axles. But due to the fact that there is not a 100% accurate fit there will be some degree of freedom of the differential in the structure (in this case the black L beams).
This movement is called “play”.

But forget about it if can’t make myself clear with this explanation.

Just noticed a comment about a “hellbender”, how did this differential assembley held up under load?

By: Sariel

Sariel — Thu, 30 Dec 2010 22:45:56 +0000

@Skel I'm afraid I fail to figure out what do you exactly mean by 'play'. Not the angle, I presume?

By: Skel

Skel — Thu, 30 Dec 2010 22:23:34 +0000

@Sariel

Thanks for the quick reply, but that was not what i meant.

Imagine the following; you hold the Differential assembley in such way that you see the L beam as an “L” (sideview). Is the play (if any) of the lego diff a factor to take in account for.
As far as text can be graphical here is the simplistic topview:

Normal:

BLACKBEAM
G |
E DIFF
A DIFF
R DIFF
S |
BLACKBEAM

What i expect:

BLACKBEAM
G \
E DIFF
A DIFF
R DIFF
S /
BLACKBEAM

cheers

By: Sariel

Sariel — Thu, 30 Dec 2010 22:07:02 +0000

@Skel You can't connect the gears outside here, because they have to engage / disengage the transmission driving ring located right next to the differential.

By: Skel

Skel — Thu, 30 Dec 2010 20:55:03 +0000

Hello,

Is there any play with this construction between the differential and the beams?
Normally you would place the diff between a pair of beams and place any connected gears on the outside. I’m sorry for this crappy question but i don’t own any technic lego to build this (yet).
Thanks for answering. regards and best wishes in advance for the future year.

By: Sariel

Sariel — Sun, 11 Jul 2010 08:29:56 +0000

Yes. It’s called GOOGLE.

By: Elijah

Elijah — Sun, 11 Jul 2010 02:50:07 +0000

do u know of a website?

By: Sariel

Sariel — Sat, 10 Jul 2010 07:14:31 +0000

Yes, and you will find plenty of mechanisms like that in the internet.

By: Elijah

Elijah — Sat, 10 Jul 2010 05:49:54 +0000

can u make a mechanism to switch from 2wd to 4wd?

By: Sariel

Sariel — Tue, 21 Jul 2009 11:37:40 +0000

@Sanket D Shah You mean a bevel gear? The differential won't work with less than three bevel gears.