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I am not sure what you mean buy using 11 gauge sheets, this is a factor of 1/4″ plate is a bit bigger than 6mm and 3/16″ plate being a bit smaller than 5mm plate. Our shredder head is sturdy we can shake the knives side to side a tiny amount but that is the only slop in the system.
By the way we are using a 3/4hp 1140rpm with a 39-1 gearbox 29rpm output/1617inch pounds and a chain coupling which seems to work fine. We tried a half coupling with a spider like your unit, but it crushed the rubber spider in seconds. Found out it was only rated for 120 inch pounds.
We are just starting our operation, and we purchased an assembled shredder head on ebay (the cost of laser cutting services here are very expensive). Our unit’s knives/spacers were made with 3/16″ and 1/4″ plate. we have noticed many of the thinner plastics we are working with don’t shear consistently, it seams like lots of plastics wrap around the knives and slide in between the fixed and moving knives.
I did the math on the spacing, sorry for you metric folks my brain works in imperial.
the original design has a 0.0393″-1mm gap between the knives
our American plate has a 0.0625″-1/16″ gap between the knives
Our unit has over 150% of the gap of the metric design do you think this is enough to cause the issues we have been seeing?
please note our head never came with the screen under the shredder and is putting out very course shredded plastic similar to a traditional ribbon paper shredder.