Zero's workshop

[Lixander]

I am very curious how much torque you got out of it 

Edited August 4, 2024 by Lixander

[Zerobricks]

3 minutes ago, 1gor said:

Perhaps you turned that way...

Been there, done that

3 minutes ago, Lixander said:

I am very curious how much torque you got out of it

Plenty, maybe even too much, since the outputs are geared down 9x. I could ditch the rear live axle and use independent suspension on all wheels and change the gearing to 5,4 to gain more speed.

Edited August 4, 2024 by Zerobricks

[Lixander]

1 minute ago, Zerobricks said:

Plenty, maybe even too much, since the outputs are geared down 9x. I could ditch the rear live axle and use independent suspension on all wheels and change the gearing to 5,4 to gain more speed.

 

I see...........then, after finishing the model, maybe you would make a video :))

[1gor]

21 minutes ago, Zerobricks said:

Been there, done that

 

And I thought you wanted to try with new hub...

[gyenesvi]

Quote

These are just a few quick photos of the working prototype, but it does show that the hub can be used for both a functional and a structural element in a non racing models aswell.

Interesting, though for non-racecar models only in fairly unconventional ways.. I think the most realistic off-roader one could achieve without such awkward / funky building tricks is an RWD buggy with independent suspension.. which is almost like a racecar.. So far this hub has not convinced me to buy it..

[NV Lego technic]

On 10/21/2023 at 12:42 AM, Zerobricks said:

Wanted to show off some custom designed and 3D - printed parts.

First are the 1 stud - wide gear shifter pieces + 12 tooth clutch gear with extension:

 

From left to right:

• A bush with the shape of an axle joiner
• 1 stud wide transmission ring
• 12 tooth clutch gear with a ring extension
• Custom transmission handle

Here's how they work (minus the 12 toooth clutch gear):

 

The shifter actually works good, there is no way of forcing the handle off from the ring and it's quite durable for its size. The only issue I see is when using it with larger 24 tooth or 20 bevel gear, where it will touch the sides of the gears before fully engaged.

 

Second concept I wanted to show is using 4 new pieces to create a very narrow independent suspension:

First there is a custom hub that can accept the small CV joint axle:

 

I am using bar holes so that you can insert the bar with a ball joint into any of the 3 available holes:

 

And the rest of of components:

 

Again from left to right:

• 3 stud long link
• 3 stud long suspension arm with an axle hole and 2 cross axles
• 3 stud long double CV joint

Combining it all together, you end up with a very narrow and compact independent suspension, perfect for the small 1:16 models (one 3x5 yellow L beam was removed to show suspension more clearly):

 

It works really good at this scale and I'm really happy with the concept. The only thing I'd improve is to redesign the hub to have a fixed steering ball, since bar connections can be tricky/weak and the outer position will be used in most applications anyway.

 

So that's a few concepts I have been working on, what is your opinion? Personally I believe that some of these may actually happen in the near future, if I had to bet it would be the 12 tooth clucth gear with extension and a shorter version of suspension arm.

Very cool! Now, only a 90° step rotary selector for small ring and we have a complete compact transmission part set.

[Zerobricks]

2 hours ago, NV Lego technic said:

Very cool! Now, only a 90° step rotary selector for small ring and we have a complete compact transmission part set.

That would be quite a challenge, since it would have to be a double one, with two wave patterns stacked on top of each other.

[Stereo]

Just a sketch in Blender cause I'm not set up to model custom parts at accurate dimensions, but maybe you could eliminate the "1L technic connector shape" piece and mount it directly on the axle with a 30-40% width (loose) axle bushing.  Gives the whole part a smaller radius that fits entirely inside the clutch gears.

Then to keep the gears apart, put a spacer on the exterior, either opposite the toggle selector, or built into the wave selector's design. (edited to add) Or, make it a C-shaped ring that slides over the selector and the opening in the C is where the selector has access.

It seems (at least on dk. bluish grey 16t gears) like there's about 1mm of leeway before the clutch gear has internal teeth, so I'd plan for the flange to fit into that space.

Edited August 8, 2024 by Stereo

[Zerobricks]

I'0m not sure if I follow... Can you give more details and perhaps use colors to show different pieces?

[Stereo]

Is this clearer?  Half bush in the middle with just the tip of the driving ring on either side of it.  If it's an actual half-bush then it only slides 1/4 stud either way so it might need to be a bit thinner.

Edited August 8, 2024 by Stereo

[Zerobricks]

And what keeps the gears apart from sliding and engaging? Also the bush would have to be perfectly cenetred - I think that's a bit too tight and unreliable.

[shroomzofdoom]

@Zerobricks

I've been messing around with your transmission design from Tiger 6x6 for quite some time. I've used it in many, many vehicles. Recently, I was able to squeeze it down even smaller with the addition of a Cada micromotor for shifting. I took note of some of the additional bracing you designed in for the 6x6 to prevent the 24T/8T combo from skipping and I think I've faithfully reproduced it here.

LXF is below. few notes:

1. I used Cada 4L friction pins (you will see these represented as two white pins)

2. For various applications I use 'flip flop' beams for the main bearing (additional gearing, steering passthrough, etc). For example, in my current design, I use a Cada 6L flip flop beam but because this isn't in LDD, I used the 7L and colored it purple.

Would love to see what you think or hear any suggestions. It works in VERY heavy duty applications and will be sharing a video shortly to demonstrate this.

 

THANK YOU for sharing your Tiger design!

https://bricksafe.com/files/midonofr/transmission2.lxf

[Zerobricks]

Thank you for the praise and the work you put into the file. Looking back at that project now, I could do so many improvements using never parts such as flip flip beams etc... Technic system just keep on getting better in that regards.

[shroomzofdoom]

6 hours ago, Zerobricks said:

Thank you for the praise and the work you put into the file. Looking back at that project now, I could do so many improvements using never parts such as flip flip beams etc... Technic system just keep on getting better in that regards.

They certainly didn't have the 24T clutch gear back then. That one is a game changer for sure!

[shroomzofdoom]

Just wanted to share the transmission working with the biggest tires I've ever been able to run from a mostly Lego design. MTP and carbon axles with lube (giggity)...but the gearbox hasn't failed yet!

 

Edited August 24, 2024 by shroomzofdoom

[Zerobricks]

New video showcasing the medium scale Tatra 8x8 built for the 2024 RoLUG challenge:

 

[1gor]

As I see you have a lot of gearing from that Large motors to (reduction) hubs. Are Large motors more efficient than XL (I know that XL motors have reduction inside motor)?

BTW very nice modular construction. You presented somethkng similar few months ago...

Kind regards

[Zerobricks]

34 minutes ago, 1gor said:

As I see you have a lot of gearing from that Large motors to (reduction) hubs. Are Large motors more efficient than XL (I know that XL motors have reduction inside motor)?

BTW very nice modular construction. You presented somethkng similar few months ago...

Kind regards

The rules stated maximum of 4 motors for driving and L motors were the best compromise.

Thank you for the praise.

[1gor]

9 minutes ago, Zerobricks said:

The rules stated maximum of 4 motors for driving and L motors were the best compromise.

Thank you for the praise.

I suppose you use 2 buwizz units

[Zerobricks]

Just now, 1gor said:

I suppose you use 2 buwizz units

No, a single BuWizz 3.0.

[1gor]

And it is enough? For 3 large motors one powerfunctions battery box is not enough

[Zerobricks]

7 hours ago, 1gor said:

And it is enough? For 3 large motors one powerfunctions battery box is not enough

Yes, because it can output 7A max, comapred to 800mA limit of normal battery boxes.

[1gor]

1 hour ago, Zerobricks said:

Yes, because it can output 7A max, comapred to 800mA limit of normal battery boxes.

Lucky for me that my models are slow (just like my building speed ), so I can have some pulling power adding appropriate reduction...

[damian_kane_iv]

Nice color choices

[2GodBDGlory]

19 hours ago, 1gor said:

As I see you have a lot of gearing from that Large motors to (reduction) hubs. Are Large motors more efficient than XL (I know that XL motors have reduction inside motor)?

I'd assume that you'd get more total power output out of four XL motors, but that would be harder to find space for, and in my experience, there are very few options to hard-couple four XL motors together without breaking parts!