What We Look At Before Production
Geometry & Tool Access
CAD Does Not See the Tool
CAD geometry describes the part.
It does not, by itself, define the practical machining strategy or its constraints.
A feature that looks simple in a STEP file can become difficult when real tooling, workholding, and material removal are considered.
We look at questions such as:
Can the tool reach the feature cleanly?
Does the geometry force an unnecessarily small cutter?
Is tool reach becoming excessive?
Does the feature create unnecessary deflection or chatter risk?
Would a different radius or geometry make the process more stable?
The objective is not to simplify every design.
It is to understand what the geometry means in actual machining.
Tolerances & Functional Features
Precision Where Function Requires It
A tighter tolerance is not automatically better engineering.
Tolerance should be driven by function.
Some features may require tighter control because they define:
Other critical functional relationships
Other dimensions may not benefit from unnecessarily tight tolerances.
Over-specifying tolerances can increase machining difficulty, inspection requirements, production time, and cost without improving the function of the part.
The goal is the right precision where function requires it.
Dimensional Stability
A Correct Dimension Can Still Be a Problem
A dimension can measure correctly under one condition and behave differently after the part is released from workholding, assembled, or loaded.
This matters particularly when a critical feature is surrounded by a thin or flexible section.
The question is not only:
Is the feature within tolerance?
It is also:
Will the feature remain stable through machining, inspection, and assembly?
Sometimes the answer is not a tighter tolerance.
It is a more stable design or manufacturing approach.
Materials & Finishing
Material Choice Affects the Manufacturing Process
Material selection is not only about strength.
It can also affect:
Manufacturing constraints
For example, 6061 and 7075 aluminum can both be appropriate for robotics and UAV hardware, but they solve different engineering requirements.
7075 is often selected where higher strength is important, while 6061 is often preferred where weldability is important.
The right choice depends on the requirements of the part and how it needs to be manufactured.
The same applies to finishing.
Surface finish, anodizing, coating, masking, and other finishing requirements can affect dimensions, interfaces, appearance, and production steps.
Assembly & System-Level DFM
The Part Does Not Exist Alone
A component can be manufacturable on its own and still create problems once it becomes part of a larger system.
When assembly or system-level information is available, we can also consider issues relevant to robotics, UAVs, and moving hardware, including:
Interference with adjacent components
The question becomes:
Will the part still work when it leaves the machine and enters the system?
This is where DFM extends beyond the individual CNC feature.
Production Readiness
Prototype Success Is Not Production Readiness
A successful prototype can demonstrate that a design can work.
It does not automatically prove that a manufacturing process is ready for repeated production.
As production repeats, variation becomes part of the engineering problem.
Factors such as:
can affect whether subsequent parts behave as intended.
The question becomes:
Can the next parts behave like the first one?
Production readiness means considering not only whether a part can be made, but whether its important characteristics can be reproduced and assembled as intended.
