+ / - Draft

[Underspec]

I can't remember if +dft means to measure at the largest end and -dft means to measure at the smallest end??

[Mike N.]

I always measure a boss at the smallest point + draft
print diameters are at the smallest usually + draft

if its a hole its at the bottom with + draft upwards

[Don Meredith]

Plus draft means material is added to achieve draft. A demension measured +draft is taken farthest from the parting line - @ least material condition. (Smallest boss, largest hole.)

[Underspec]

So...

+ draft in a hole means the dimension gets bigger towards the other end.
- draft in a hole means the dimension gets smaller towards the other end.

And...

+ draft on a stud means the dimension gets bigger towards the other end.
- draft on a stud means the dimension gets smaller towards the other end.

[Don Meredith]

To restate:

Plus draft adds material as you move toward the parting line.
Minus draft removes material as you move away from the parting line.

Minus draft measurements are made closest to the P/L, plus draft are farthest from P/L.