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looking good & progressing well mate
also good to see someone who wears the same shed safety shoes as me LOL

Yeh most standard platen wheels are 2"

My small wheels are 2", 1" & 1/2", to,small for skate wheels possibly

Progressing well
I have changed my motor mount design a couple times as I have drawn each section up, to allow for the alignment of my drive to tracking, to swinging wheeled platen and my small...

I am going with a Gas spring strut tat I intend to hide inside a vertical tensioning post, and all the info I have founds has a general consensus of about a 15kg/33lb (150n) strut so I would assume...

measure the shaft across the diameter only not where the key way is
so 90 degrees to your picture

I have been looking at the WEG W21 motor options these are IP55 rated with Aluminium bodies

K11ALE2W21 is a 1.5kw (2hp) 1 phase 2 pole 3000 RPM ($460AUD local) then add pulleys etc

K12ALE2W21...