not a clue what im doing

hi i was reading some of these projects and was wondering how do i go about making my own i have no clue on what to do but would rely love to build one any advice on the easiest way to build one as in what parts to get and how to control them thanks

im gunna use 2x www.motiondynamics.com.au/worm-drive-motor-12v-24v-200w-180-rpm-20nm-torque.html was wondering what power supply to use been told 2x 12v - 45 amp but i dunno what im lookin for please help

Hello @jellybeen89 , thats a broad question.
Do you have a frame design in mind?
heres a few of what I have built http://www.xsimulator.net/community/threads/different-2dof-sim-builds-feel-free-to-add-designs.5624/ , if anything takes your fancy, feel free to copy and or mod your own build. And have a dig through the threads , pics and videos of the other builds on site.
Ok if you are not the best with electronics like I am, use these control boards
http://www.pololu.com/product/1393 one for each motor. will handle 14v at 30 amps continuous all day with heat sink and cooling. Several of us run them on the larger DC motors like you are looking at.
Wiring diagram

get some 5k ohm single turn 360 deg turn pots like this
http://au.rs-online.com/web/p/potentiometers/1642661/
mount it on the back of the motor shaft bolt.
best thing I found is drill a hole into the centre of the bolt to fit the pot shaft, then drill and tap a 3mm bolt hole on one side and screw a bolt in to hold it.
In the picture I ran a piece of wire through though. i found it quicker to just tap a small bolt in to hold the pot shaft.

Power supplies are about right, allow 12v 40-45 amps each motor.
@Nick Moxley uses re-wired server PSUs, so he can advise there.
I found these successful http://www.ebay.com.au/itm/110V-220...68828?pt=AU_Lighting_Fans&hash=item1e8fc8035c
and I use one per motor.
Pivot to make a 2 DOF frame is best use a cut down rear wheel drive shaft with a half decent uni joint in it. I bought a whole shaft for $20 from the local wrecking yard so shop around. I asked for rust and cheap. Unis were ok, so that does the job.
heres an example of a cut and welded one
That should start you, if you need to know more, just ask.
Cheers, Dave.

@bsft thanks for all the info and pics they help alot and from what i seen on others shoulder mount ones are what im thinkin about i will be sure to keep ya posted and ask if need by on my build thankooooo Tony.c

Hi BFST, I noticed that you always recommend the JRK.
What is the ratings of the motor you use for the JRK? ie, rated current, no load speed before gearbox and gearbox ratio?

Generally JRK will run 14v, 30 amps continuous all day with heat sink and fan cooling, with 40-45 amps spikes.
That more or less works out to max 250 watt motor as they get over driven 2.5-3 times their rated power. So gearbox ratio choice is more for either speed or more torque.