Have put a few armfuls of 2 - 3 mm diameter hard dry sticks through, great results - noisy but ! !
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Err, meant to write 2 to 3 cm diameter sticks were put into the hopper, not 2 to 3 mm doh !
That was before I found out only up to 15 mm diameter sticks should be put into the shredder part.
Anyway it handled them OK but from now on I'll try to avoid anything bigger than 15mm into the hopper.
The chipper chute is 7 cm wide and takes sticks up to that size OK but they need to be fed in slowly however sticks of that size get used for firewood in our wood heater.
Thanks to having the manual I've now had a good look over this machine. Apart from being rusty in parts it is in quite good nick and I'm hoping to get a good amount of use from it. Next job will be removing and sharpening the chipper blades, they have obviously had a pounding.