G'day all,
With reference to your closing line above:,
Oooohh, Jack, can we? Can we please??
My knowledge of later Greenfield stuff is poor. Did Theo ever use a system where the cutters were engaged by moving the deck or the threaded clutch hub system? My understanding is that he didn't but... Can someone shed light here?
I kinda reckon moving the deck to engage the blades is a bit like moving the mountain to Muhammad. But his idea of using a 'lock link' to more positively disengage the drive is clever.
The threaded drive hub. Was it ever used? The manufacturing issues relating to the square drive have been solved these days by CNC milling? That said ite threaded idea has a certain elegance.
He discusses milling the square drive into both the male and female hub halves. Strikes me that this would be a nightmare as both would have to be aligned once the halves are screwed together, or it would have to be milled after the two halves were screwed together. And if the thread tightened or loosed in service the whole think would bind on the square shaft. A better idea would be if the male half only was cut to fit the square shaft and extended to support the female hub? Perhaps I've read it wrong.
Also, unless the shaft was made very precisely with good tolerances shimming might still be needed to minimise pedal travel? And some sort of centring spring arrangement will be needed to place the system in neutral with foot off?
Just an interested enthusiast who would like to understand this stuff better.
Cheers,
