Just a note here.
I would make the mechanical parts of the logo in CAD, and make sure it's "technically correct", before handing it off to the logo people, for colors, shading, and type face of text.
Your logo is for a business that the customers are technically minded people, make sure the thread form is proper, bolt heads drawn to the proper proportions, etc.
If not, you'll be forever apologizing for it, and wondering how many sales were lost,
from people that were turned off by a sloppy modelling job, and never contacted you in the first place.
We have a couple of local places that have "mechanical" logo's (bank, dentist office, etc.)
and the parts are all wrong. Gears that can't mesh, sprockets tossed in the "gear train" as well....ugh.
