Volvo A40F articulated dumper

[kenobi]

A short demo of my 1:14 scale Volvo articulated dumper 6x6 wheel drive. The dumper tipping mechanism is a spindel motor system from Carson Germany.
The drive motor is a 6 V geared motor from Conrad electronics.
The articulated turning mechanism uses 2 13/70 electric cylinders from CTI Germany.
I may be swapping the electric cylinders with real hydraulic ones.


Here is a pic of it beside a Fumotec model to the left

[kenobi]

A little video demo

http://youtu.be/oeZYuqaIq0U

[Hemi1966]

Nice work Kenobi. Are those Tamiya axles you are using?
I'm trying to decide what to build next and the A40F is something I might like to do...

[Manfred]

Great cinema. Good idea too turn with cti cylinders. I think it's an option for my next Volvo-dumper.

Manfred

[kenobi]

Originally Posted by Hemi1966

Nice work Kenobi. Are those Tamiya axles you are using?
I'm trying to decide what to build next and the A40F is something I might like to do...

Yes, they are regular tamiya axles.

[kenobi]

Originally Posted by Manfred

Great cinema. Good idea too turn with cti cylinders. I think it's an option for my next Volvo-dumper.

Manfred

Thanks, I must confess that I am not the maker , the original maker is in France and I bought it off him.

As regards the CTI cylinders, they can be a bit hit and miss and I can not yet figure out why they sometimes do not work. Some days they work without a glitch , other days they suddenly stop working intermittently. Each cylinder piston is capable of 4 kg push and pull , that's 8 kg working together which should be more than enough for steering. I am running them on 3 Cell lipos but I am tempted to try 4 cells .

[sparkycuda]

A really nice model. Dump system speed is very prototypical and smooth. I don't have any personal experience with the CTI cylinders but have seen them used in a variety of applications. Let us know when you find out what is causing the occasional problem.

Love the sound system and lights!

Ken

[Espeefan]

Definitely a great looking model! It seems very well built and scale as well. No lack of traction either, climbing over the boots and weights you laid in it's path. Is the model built out of metal and styrene?

[kenobi]

Originally Posted by Espeefan

Definitely a great looking model! It seems very well built and scale as well. No lack of traction either, climbing over the boots and weights you laid in it's path. Is the model built out of metal and styrene?

Metal, apart from the inside of the cab which is plastic and wood

[Fired up]

nice after I finsh my dozer I may have to start one myself

[Manfred]

Originally Posted by kenobi

As regards the CTI cylinders, they can be a bit hit and miss and I can not yet figure out why they sometimes do not work. Some days they work without a glitch , other days they suddenly stop working intermittently. Each cylinder piston is capable of 4 kg push and pull , that's 8 kg working together which should be more than enough for steering. I am running them on 3 Cell lipos but I am tempted to try 4 cells .

Leave it with the 4 Lipo cells. The problem with the CTI cylinders is that the electronic end stop does not always work properly. Take on each side O-rings, so that can not run on end stop while steering the cylinder. I even installed each 2 O-rings on each side with me.

Manfred

[kenobi]

Originally Posted by Manfred

Leave it with the 4 Lipo cells. The problem with the CTI cylinders is that the electronic end stop does not always work properly. Take on each side O-rings, so that can not run on end stop while steering the cylinder. I even installed each 2 O-rings on each side with me.

Manfred

Do you mean O rings installed on the piston shaft so that each shaft can not be pulled completely into the cylinder?

Also is the Thor 2 BCD speed regulator ESC good enough or do you have better experience with another ESC type for parrallel CTI cylinders

Thanks for the great advice.

[Manfred]

Do you mean O rings installed on the piston shaft so that each shaft can not be pulled completely into the cylinder?

Yes at the piston shaft and the threaded rod.

Also is the Thor 2 BCD speed regulator ESC good enough or do you have better experience with another ESC type for parrallel CTI cylinders

The Thor is o.K.

Another option is this one. http://www.cti-modellbau.de/CTI-Schaltmodule/-154.html

With limit switches, you can limit the way and with this switch module you switch on minus the knob. If the limit switches are set correctly, the cylinder no longer drive fixed. I would recommend it but only with the O - try wrestling.

Manfred

[kenobi]

Thank you for the tips Manfred.

[Espeefan]

Originally Posted by kenobi

Metal, apart from the inside of the cab which is plastic and wood

I had no idea it was all metal! Very cool! Usually the mass produced kits we see have the complex parts, like the cab and hood, made out of mold injected plastic. It's incredible to see everything made out of aluminum. The A40F looks beautiful in it's raw state! I know this isn't a mass produced kit. The original builder must be a master with shaping aluminum.