Much MUCH smaller... coil springs on a vehicle are around 0.43 and larger in diameter... 100 plus times the area.
I was winding new springs for a very specialized gun that they quit making parts for the second it left the factory floor.
Though I have done automotive coil springs a few times. In auto shop with a big compressor, it went well... in a friend's friend's garage with a little 20 gallon 120V compressor, not so much. Got quick at getting my hand out of the road when the coil compressors decided to slip and meet up with "la grande force". :P
Bren R.
