From gears to G-code
A winding machine sets the fibre angle with two motions: the mandrel turns and the carriage travels. Unroll one turn and the angle falls out: tan α = πD / pitch. In the mechanical era the pitch was a gear ratio, so a new diameter meant new gears; today two servo axes are coordinated in software, and more axes (and robots) open up domes and non-round parts.
Predict · at 1:02 in the video
Keep the same gears, so the same pitch, and swap in a mandrel twice the diameter. Does the angle go up, down, or stay the same?
It goes up, towards a hoop. The pitch stays the same, but each turn now covers twice the circumference. Same gears, 300 millimetres: about 72 degrees.
This course is our own. These books go deeper.
- Composite Filament Winding, S. T. Peters (ed.), ASM International, 2011
- Filament Winding: a Unified Approach, S. Koussios, Delft University Press, 2004
Simulations in this lesson are our own. Where a number rests on an assumption, the video marks it with an asterisk and says where it comes from.
