I started by looking at the vehicle form and imagining which parts would be certain body parts in the robot form. After this, I try to create limbs in the robot form that look like the vehicle parts...
Hope this helps.
If you're just starting out, I would recommend that you build a humanoid form using exo-force joints. Then, experiment with contorting it, and find a vehicle that would suit the figure. From there, its pretty easy to build off of the frame. [Cars are generally easiest when you're using a basic frame.] Permalink
Most of my Lego Transformers have LDD instructions. You can check out some of my techniques there. If you have questions, just ask. Also, Chris Roach has a lot of videos of his Transformers on youtube under the name "Boyzwiththemosttoyz" Permalink
I love seeing the comments above, observing their orderly planned out techniques, and then looking back to my slapdash ways.
Honestly, I just go with it. The model kindof builds itself for me. I put random clumps of symetrical joints together until I create faintly recognizable form of either a robot or vehicle. After that I contort the mass into something that is remeniscent of the opposite form and work my way from there. Permalink
I am new to the group, and indeed to MOCpages, but I have some advice:
Having no ball joints or ratchet joints, I would recommend using technic, and using lots of worm gears to govern shoulder, hip and spinal transformation hinges.
For knees and elbows I use axles that slide through cross-pin holes like pistons, providing high friction. Modern technic contains 5.5 measure-long dark grey axles with a flange at 1 measure which are very good for this purpose.
Non mobile parts that need to move during the transformation I lock using pegs and rivets.
And, as a general rule, build a basic robot that becomes a sturdy chassis before adorning with the head, the body panels, and weapons. Permalink