I'm looking for something to make my voice sound mechanical/robotic etc. Are there any pedals/boxes or anything that could give me a variety of these sounds. Thanks for your help.

A ring modulator is a possibility.
1997 Guild Bluesbird
Gibson Les Paul Bfg
Ibanez GSR200FM Bass
Bugera V55HD w/avatar cab
Fender Champ 600 with 4 ohm cab
70s traynor 200w head with 2 9x8 cabs for bass
The only place I can think of where this might go is the Vocal thread in the MT main forum, if you don't get any help there - try Guitar Gear & Accessories, but I don't know how successful you'll be there.

Either way, not here.