State the reference face
Hole and groove dimensions are given from a reference face. If it is not stated which edge is the reference, holes can end up on the wrong face on asymmetric parts.
Marking the reference edge on the drawing and, where possible, noting which face is the visible one removes the risk entirely.
The part list and the drawing must agree
The most common inconsistency is a dimension in the list differing from the drawing. That has to be queried, and the quotation is delayed.
Stating up front which of the two takes precedence is a good habit.
What the file should contain
For CNC work, the content that speeds up a quotation is:
- Part list: dimensions and quantity
- Hole and groove details, with diameters and depths
- Reference edge and visible-face marking
- Who owns the board / panel material
- Whether edge banding is required
Optimisation reduces waste
Because the cutting plan is optimised, parts coming from the same board are nested to keep waste to a minimum. On jobs with many parts this shows up as a visible material saving.
If you have a little flexibility in dimensions, saying so lets the optimisation work better.