11-01-2012, 12:53 PM
Very nice, Colin. It's just crying out for a motorised drive now 
I remember concocting some drive electronics for a friend at school who chose that as her GCSE Technology project - just a couple of relays and a light sensor IIRC. I'm interested in seeing more of the bearing blocks - would a shot from above clarify how they are secured to the window frame, and what sort of bearing arrangement is in there - what's a "plain bearing" in this context? I guess that miniature ball bearing races might be a little OTT for this, but they are cheap and plentiful (I used to rescue them from old DLT tape cartridges that we use for backing up servers).
All the best,
Mark
I remember concocting some drive electronics for a friend at school who chose that as her GCSE Technology project - just a couple of relays and a light sensor IIRC. I'm interested in seeing more of the bearing blocks - would a shot from above clarify how they are secured to the window frame, and what sort of bearing arrangement is in there - what's a "plain bearing" in this context? I guess that miniature ball bearing races might be a little OTT for this, but they are cheap and plentiful (I used to rescue them from old DLT tape cartridges that we use for backing up servers).All the best,
Mark
