[moc] not-so-big blue (a.k.a. yet another rough terrain crane)

[suffocation]

Hadn't whipped up anything new in ages. Was stuck on this thing for just as long and eventually figured it out in spite of exacerbating brain rot. Tons of room for improvement but a fun model nonetheless; always wanted a blue crane; and needed to get it done as part of a long healing process.

Features:

- RC drive (2 PF XL) with planetary hubs
- RC 4-wheel steering (1 PF servo)
- RC outriggers (1 PF M)
- RC crane functions (1 PF L) through a two-way, five-switch gearbox
- independent suspension
- vertically mounted diffs for limited track width.

Couldn't be arsed to cram in a fake engine or third boom stage. 'tis good to be a sloth.

Video coming eventually.

 

 

 

[Timewhatistime]

I have never seen such a combination of a pair of 12t/20t bevel gears to transmit more torque. This is a very good idea (I wouldn't ever had)!

Edited September 11 by Timewhatistime

[Shiva]

Looks good :)

[Timewhatistime]

I really like that you avoided visible color v§$%&: Black Liftarms are combined with black pins, blue liftarms are combined with blue pins (mostly). Even at the cabin there are mostly white pins!

So everything looks clean and intended.

This has to be appreciated!

There is a gray 16 t spur gear located within the turntable on one of the axes which are driving the outriggers.

What's its purpose?

Edited September 12 by Timewhatistime

[2GodBDGlory]

14 hours ago, Timewhatistime said:

I have never seen such a combination of a pair of 12t/20t bevel gears to transmit more torque. This is a very good idea (I wouldn't ever had)!

Oh, I didn't catch that at first glance! That is really cool!

[suffocation]

Thanks for the kind comments

On 9/12/2024 at 12:37 AM, Timewhatistime said:

I have never seen such a combination of a pair of 12t/20t bevel gears to transmit more torque. This is a very good idea (I wouldn't ever had)!

I first saw this in a build by Sander Mulders. For some reason the two gears don't always line up perfectly, so you need to fiddle around with them to make sure the combo sits just right and without any unnecessary friction.

On 9/12/2024 at 8:35 AM, Timewhatistime said:

There is a gray 16 t spur gear located within the turntable on one of the axes which are driving the outriggers.

What's its purpose?

It's connected, via an assortment of red spur gears and another gray spur gear, to an M motor.

[Timewhatistime]

1 hour ago, suffocation said:

Thanks for the kind comments

I first saw this in a build by Sander Mulders. For some reason the two gears don't always line up perfectly, so you need to fiddle around with them to make sure the combo sits just right and without any unnecessary friction.

It's connected, via an assortment of red spur gears and another gray spur gear, to an M motor.

Ah? Thanks for the clarification!

It seemed as if the outriggers were driven from the upper structure (brown axle through the turntable, grey 2L axle connector, grey 20t bevel gear on vertical axle... and finally the two tan 20t bevel gears on the two horizontal axles to the outriggers).

So another question emerges: Which function is driven by the axle which goes through the turntable?

[suffocation]

Ah, now I see where the pic can be deceptive.

So, the connector in the middle is driven by an L motor in the carrier and delivers power to all the functions in the superstructure.

The two tan 20T bevel gears are connected via a grey 20T clutch gear that spins freely on the axle connected to the L motor.

[Timewhatistime]

Thank you very much for your answer. You got exactly what I was wondering about. Now it is clear!

Of course, the grey 20t gear is an idle gear which spins freely on the "turntable axle" and connects both outriggers.

 

And of course, you didn't use the "normal" 20t bevel gears in two different colours!   :-)

Edited September 14 by Timewhatistime