Technic Parts We Would Find Useful

[Stereo]

A thin liftarm with half-offset axle holes at one end would be nice to have.  Like the cam piece but not 2 studs wide.  Maybe 5 long with 3 pinholes, then 3 axleholes overlapping.

[gyenesvi]

  On 6/29/2024 at 6:24 PM, 1gor said:

Today I was praying for exactly that part...

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Maybe I heard it :D

  On 6/29/2024 at 7:25 PM, astyanax said:

I'm quite sure I was already arguing in favor of exactly this part on the first page or so. 

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Better later than never :D Sorry for being slow.. Not that this render would change much about the situation..

  On 6/29/2024 at 8:43 PM, Stereo said:

A thin liftarm with half-offset axle holes at one end would be nice to have.  Like the cam piece but not 2 studs wide.  Maybe 5 long with 3 pinholes, then 3 axleholes overlapping.

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Indeed, that one as well. I guess even a 2L version with 3 axle holes would be doable based on the cam piece, though may be too weak..

Edit: just realized that a 2L version with 3 axle holes would be pointless; it's impossible to insert two axles with 0.5 spacing. So the shortest meaningful one would be 2.5L (kind of too similar to existing 2L). In case of overlapping axle holes, some reinforcement seems necessary, like in case of the cam piece (wider around the axle holes).

Edited June 29, 2024 by gyenesvi

[Stereo]

  On 6/29/2024 at 10:32 PM, gyenesvi said:

In case of overlapping axle holes, some reinforcement seems necessary, like in case of the cam piece (wider around the axle holes).

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Yeah, the way parts like the 24t gear have been modified over the years (getting rid of its diagonal axle holes) makes me think they're more cautious of parts that can break into small pieces now.  So maybe more viable is something like a 2.5 or 3.5 stud beam with axle holes at both ends and nothing in the middle.

[1gor]

  On 6/29/2024 at 10:32 PM, gyenesvi said:

Maybe I heard it :D

 

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Well, you're not that far away 

[howitzer]

  On 6/29/2024 at 8:43 PM, Stereo said:

A thin liftarm with half-offset axle holes at one end would be nice to have.  Like the cam piece but not 2 studs wide.  Maybe 5 long with 3 pinholes, then 3 axleholes overlapping.

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I've been wanting for a long time more parts for making half-stud offsets and something like this along with the forementioned 4-pinholes+axlehole part would be greatly useful. The current selection of such parts are much too restricted in the ways they allow connections.

[msk6003]

While building my TC27 entry, I find I need this kind of beam.

[NV Lego technic]

I'd love to see a 3l beam with axles on ends. Also, all of suspension wishbone variations seem very cool and I'd definitely find this useful, but untill then we have to resort to using old ungeared hubs and weak CV joints. Also a universal joint that has an axle on one end and is "normal" on the other would be a good part for 9 and 7 stud wide driven and steered axles, and 11 stud axles with diffs. Then, a 20t double bevel lockable differential would be cool, as it would de easier to protect it from grass (my models love it) and you could fit it inside of a 5 x 7 frame with a 2l driving ring and have a compact lockable diff setup. The only problem would be powering it inside of that setup. Although I don't have access to studio right now, so maybe there are some gear combinations. 

[HorcikDesigns]

I was always (since learning what it is, with some pauses of course) dreamed of some proper Tatra suspension parts, so I finally tried to think of how it could look like. You can 3D print them too, if you would like. ;)

https://makerworld.com/en/models/513453#profileId-429560



I know, the thing on the picture has only axles and axle connectors (and hidden liftarm) made by LEGO. But I would find very useful the 22t module 2 gear with axle hole. :)

[1gor]

@HorcikDesigns I wpuld be glad if there would be possibility to have 20 tooth double bevel gear for differentoal housing to incorporate smaller differential in Tatra type suspension

[HorcikDesigns]

@1gor@1gor  well, that would be very good paet, but it would require 0.5 module (or smaller) gears. I have them prepared, but making reduction to lego axle will be tricky. All at all, fit coaxial differential into 24mm (3 studs) and make 5mm (diameter of axle) reduction will be quite a challenge. :D

[1gor]

  On 6/30/2024 at 2:55 PM, HorcikDesigns said:

@1gor@1gor  well, that would be very good paet, but it would require 0.5 module (or smaller) gears. I have them prepared, but making reduction to lego axle will be tricky. All at all, fit coaxial differential into 24mm (3 studs) and make 5mm (diameter of axle) reduction will be quite a challenge. :D

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I know buddy; that is giving me headachse for some time for my Syntrac...if you remember that I made 21 stufs wide Tatra axle inclooding Unimog tires

...now 17 or 19 studs wide inclooding Zetros tires is my challenge

  On 6/30/2024 at 2:55 PM, HorcikDesigns said:

@1gor@1gor  well, that would be very good paet, but it would require 0.5 module (or smaller) gears. I have them prepared, but making reduction to lego axle will be tricky. All at all, fit coaxial differential into 24mm (3 studs) and make 5mm (diameter of axle) reduction will be quite a challenge. :D

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If you asked me, I'll be satisfied with that kind of gear arangement...

 

[Stereo]

I have thought about a smaller diff design, probably 24t ring, but never got to building a 3d model for it.  It might work with the usual 'axle hole on an undersize bar' but probably 12t bevel with pinhole would be helpful to making it structurally sound.

1st piece is loose bar (or pinhole) sized stubs for mounting the planets, you'd put an axle with stop through from the middle into the 12t bevel on one side.

2nd piece is a 24t gear with a 1 stud wide crosspiece through the middle, with pinhole, and gaps for the bevel gears.  So an axle with stop goes through it the other way into the other 12t bevel. 

The two fit together like lincoln logs and are fit in between beams so everything's captive.  Wouldn't be as strong as a one-piece diff but for the kind of small construction that wants a narrow diff it'd be fine.

 

It might be possible to have the bars for the planet gears overlong and clip into the ring gear, but I'd need a dimensionally accurate 3d model to decide about that.

Edited June 30, 2024 by Stereo

[gyenesvi]

  On 6/30/2024 at 11:05 AM, msk6003 said:

While building my TC27 entry, I find I need this kind of beam.

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I think this kind of beam would unfortunately be too weak at the point where the 3 overlapping axle holes are..

  On 6/30/2024 at 12:13 PM, HorcikDesigns said:

I was always (since learning what it is, with some pauses of course) dreamed of some proper Tatra suspension parts, so I finally tried to think of how it could look like. You can 3D print them too, if you would like. ;)

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Oh, that's a very neat design! Quite specialized, but not more than the fenders of the lunar rover :)

  On 6/30/2024 at 12:51 PM, 1gor said:

@HorcikDesigns I wpuld be glad if there would be possibility to have 20 tooth double bevel gear for differentoal housing to incorporate smaller differential in Tatra type suspension

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  On 6/30/2024 at 4:05 PM, Stereo said:

I have thought about a smaller diff design, probably 24t ring, but never got to building a 3d model for it.  It might work with the usual 'axle hole on an undersize bar' but probably 12t bevel with pinhole would be helpful to making it structurally sound.

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I have also been thinking about smaller, 20T differentials, that would be kind of a holy grail for live axles, because they could become smaller in multiple dimensions which would reduce bulkiness a lot and make space for other things like steering linkages and panhard rods. There's a 3d-printable 20T differential housing (2 studs wide) and tiny gears to inside designed by Efferman, I have them printed, so it's doable. The only problem with it is that it requires a 12T gear on a 2.5 stud axle to drive it, which would probably have to be a single piece then, and then only a U-joint can be connected to it on the other side, no CV joint. Still it could work, but needs some specialized parts. I think the best way to make that would be a pre-built, enclosed diff housing with tiny gears inside made from some stronger material, something akin to the planetary hub. And then a 5x5 diff frame could be made for it.. So not quite the generic parts that I'm aiming for in this thread, but yeah, would be a game changer.

@Stereo I'm not really able to follow you with these drawings.. I especially don't get the 24T or 28T gear, because the point would be to fit into 3 studs (right?), and those don't.

Edited June 30, 2024 by gyenesvi

[Stereo]

  On 6/30/2024 at 9:44 PM, gyenesvi said:

@Stereo I'm not really able to follow you with these drawings.. I especially don't get the 24T or 28T gear, because the point would be to fit into 3 studs (right?), and those don't.

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24 can't, but it's possible to use the space 2 studs away for parts shaped like axle/pin perpendicular connector's axle end (6536, 42003, 32068).  Though interestingly that only applies to some 24T gears, I ran into a problem with a MOC once when I used the wrong variant of 3648b - some have flattened tips of teeth, some are rounded and can't do this.

I'll have better 3d tools later in the week for measuring this stuff, I'm wondering if a 20t would work if you basically design it as slots in the outer housing of the diff that a non-bevel can dig into.  Or if those teeth get all the way into the 12t bevels inside the diff.

[Paul B Technic]

This but 4L

[gyenesvi]

  On 6/30/2024 at 10:05 PM, Paul B Technic said:

This but 4L

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That's already on the list on the first page. And you can buy it from Cada, I have them.

[Paul B Technic]

  On 6/30/2024 at 10:10 PM, gyenesvi said:

That's already on the list on the first page. And you can buy it from Cada, I have them.

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Thanks, I had not seen that. I might have to get some.

 

[Erik Leppen]

  On 6/30/2024 at 10:05 PM, Paul B Technic said:

This but 4L

 

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Use two normal black pins and a 4L bar.

Really, bars are the most underrated pieces in Technic, as they fit into both pins and axleholes, and even allow the axlehole connection to be rotated.

[SNIPE]

I agree that you can sort of join 2 pins together using a bar , and that bars are useful, but a 4L friction pin would still be more reliable.

[NV Lego technic]

  On 7/3/2024 at 10:28 PM, Erik Leppen said:

Use two normal black pins and a 4L bar.

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I also use this solution a lot in my MOCs.

[msk6003]

Congratulation guys. There is 12t clutch gear on mclaren.

[NV Lego technic]

Let's goooooooo

[Zerobricks]

Just wish they would design it so it can also mesh with combined spur/bevel gears...

[NV Lego technic]

Or have a separate extension ring so it could be used to spin Independent from the axle it sits on.

[gyenesvi]

  On 7/10/2024 at 4:39 PM, msk6003 said:

Congratulation guys. There is 12t clutch gear on mclaren.

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Yeeeaaah! Even though I don't think this thread has influenced anything, this part / the whole gearbox was probably being already designed when that gear was proposed, but I am quite happy that this happened, and that it's kind of the form that we predicted. Excited to see how it can be used in compact RC gearboxes.

  On 7/10/2024 at 5:57 PM, NV Lego technic said:

Or have a separate extension ring so it could be used to spin Independent from the axle it sits on.

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Not sure if that is physically possible, but interesting idea!