My Scania T-Cab + crane project in 1/14 Scale

[rebekah andersonParticipant @rebekahanderson95322]

[rebekah andersonParticipant @rebekahanderson95322]

Hiya,

Thought I's share my project. I am building a working scale model of a Scania T-Cab with a working hydraulic palfinger crane.

I want to make my own hydraulics for the crane.

the truck is currently fitted with a second steering lifting axle which i cut and milled in to the shape it is now.

The crane on the back is the prototype to the dimensions and have templates to cut from

Edited By rebekah anderson on 20/05/2013 19:46:13

Edited By rebekah anderson on 20/05/2013 19:47:36

Edited By rebekah anderson on 20/05/2013 19:47:54

[I.M. OUTAHEREParticipant @i-m-outahere]

Hi Rebekah,

Nice work !

Will it be electric powered – maybe RC ?

Sure makes a welcome break from trains and well more trains – not that i don't love trains but it is good to see some one doing something different .

Model engineering is only limited by ones imagination !

You have some interesting jobs coming up with the hydraulics and pipe work !

Keep us updated and maybe you can do a you tube video when it's finished .

Ian

[rebekah andersonParticipant @rebekahanderson95322]

yes it will be electric powered. the crane will be fully operational and hydraulic.

this forum is a life saver for me. so much to learn in so little time. I so want to get CNC under my belt but just can't get there. time and effort with everything else going on.

the threading tips are fantastic and the link to Cutwells has been a very pleasing addition to my list of suppliers.

there are a number of tools from there that I will be getting. the drill bits especially.

[Ian S CParticipant @iansc]

Might be of interest, I did a bit of metal doodeling in the workshop today, took a scrap of steel bar, about 10mm dia, and drilled it through 6 mm, I then took a 1/4" ball bearing ball, and forced it through the hole (a number of times actually), it was still tight , but the bore nice and polished, a 6 mm shaft with an O-ring would turn it into a good hydraulic cylinder. Think the 10 mm bar was a bit of re-bar.

Ian S C

[rebekah andersonParticipant @rebekahanderson95322]

Just a little further. Ally welding is a pain but worth it.

Edited By rebekah anderson on 27/05/2013 15:39:11

[rebekah andersonParticipant @rebekahanderson95322]

Well the bonnet got mounted.

Will be making a motor cover to make the electic motor look like the real thing.

Edited By rebekah anderson on 02/06/2013 22:38:39

[Mark CParticipant @markc]

Rebekah,

I took a look at the other pictures and they seem to be doing work in miniature! I got interested and did some rough calculations assuming your 1:14 scale and was interested to know what system pressure they must be using – even at 350 bar, the scale force for a 7mm dia. cylinder – the scale of a 100mm cyl. that would lift 28 tonnes – you would have 143 kg lift. I assume that you are not anything close to that so the ability to do work must be very limited especially at full extension/worst case mechanical advantage?

Mark

[rebekah andersonParticipant @rebekahanderson95322]

I've seen one lift 5kg at full extension.

It wouldn't be at 350bar.

[Mark CParticipant @markc]

That would still require at least 12 bar+ just to lift a vertical 5kg load direct on the cyl. with out taking any lever arm into account, if you assume at least a 5:1 lever arm you are straight into 1000 psi or more.

Did the model you saw have hydraulic cyl. or electric servo look-a likes?

Mark

[Mark CParticipant @markc]

Just had a bit of a google and found some video – probably the one you mention – here **LINK** but he does seem to mention 25 bar and it is at the best mechanical advantage for a lift! I would also guess he is using bigger than 7mm dia. cylinders… I often use plastic air pipe that looks very much the same as the stuff he uses but I had no idea it would work at that sort of pressure!

Mark

[Mark CParticipant @markc]

Just watched some more and the lift cyl. looks to be about 30mm or more which would give something like 80kg force – which looks consistent with the load etc.

I also noticed the bit about needing kW+ rated power for the pumps!

Mark

[rebekah andersonParticipant @rebekahanderson95322]

The 6mm rams are for the extending boom.

[SpringbokParticipant @springbok]

Hi Beky
Fantastic work, Pity you do not live in Bristol would have draged you into the BSMEE.
Thought
our Thornbury Exhibition is comeing up in August why not bring it down and exhibit.
Look forward to more postings.

Bob

[Diane CarneyModerator @dianecarney30678]

Hi Rebekah

I snet you a PM a couple of days ago. Could you have a quick look when you get a minute?

Thanks
Diane

[rebekah andersonParticipant @rebekahanderson95322]

Bob,

I would love to have attended. but maybe next time.

Diane,

PM sent

thank you for the compliments every one. hope to add more soon.

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