Some of the best mechanical-design lessons are not learned from a CAD tutorial.
They are learned next to a machine.
If you design mechanical products, spend time watching how your drawings become physical parts.
## You will understand tolerances differently
A ±0.01 mm tolerance looks like two characters on a screen.
After watching a machinist hold that tolerance repeatedly, you understand the manufacturing effort behind it.
That experience changes how you assign tolerances.
## You will see assembly problems early
Operators often know exactly which features are awkward to assemble.
If you watch the process, you can redesign those features before the next product revision.
## You will learn what drawings actually communicate
A drawing may look obvious to the designer.
The person making the part may interpret it differently.
That feedback is extremely valuable.
## You will understand process limitations
A press brake, CNC machine, welding station and laser cutter each have practical limits.
The more you understand those limits, the better your designs become.
## Ask operators questions
Simple questions can teach a lot:
“What causes this rework?”
“Which dimension is difficult to hold?”
“Why are you doing this setup?”
“Could the design make this easier?”
Most experienced operators are happy to explain when they see genuine curiosity.
## Design engineers should connect digital and physical worlds
CAD is powerful.
But CAD is only a representation.
The real product lives in the factory, assembly line, warehouse and customer’s hands.
Spend time there.
Your designs will improve.