Taking inspiration from http://bookliberator.org/doku.php
and translucent1's sexy 80/20 build. So far all i have is a 19x23" box of 1.5" extrudes held together with 80/20's tri-corner pieces . It's going to have a 16x20" scanning area for large format books.
I originally had all kinds of elaborate ideas for a lifting mechanism for this glass and metal box with cameras and lights all over it, but the other day on slickdeals i saw a cheap $20 bike hoist and realized it'd be perfect. After looking at all the different ones on amazon today i picked out this one http://www.amazon.com/RAD-Cycle-Product ... pd_cp_hi_3
, it was only $28, and of course as soon is i went to check out it popped up OOS. hopefully they get more in. Combine the bike hoist and a cheap handcranked winch or even a cheapo powered winch, and my platen will be airborne.
For attaching the glass 80/20 sells a panel gasket to hold glass into the t-slots of their extrudes. I'm getting all my 80/20 products from their scratch&dent store on ebay, http://stores.ebay.com/8020incgaragesale
For the actual glass i was looking at Tru Vue AR Museum framing glass from http://www.mmdistributors.com/Tru-Vue-A ... 0glass.htm
. $38 for a box of 3 16x20". i'd have to trim my framing a little, but i'd rather do that than cut glass. Unfortunately that distributor has a minimum order of $50 and i'm still not sure they'll deliver to me. May have to ask around at framing shops for glass.
I'm also curious what a good thickness is for scanning glass. The tru vue is 2.5 mm (.09"), the panel gaskets are made for .188" panels, i may have to double up on the gaskets.
For the base and cradle i'm going to do basically the same setup as translucent1, 80/20 rails with UHMWPE u-channel and bearing pads.
One thing i'm not sure about with the bike hoist though is swing. would i need to put vertical rails on the sides of the base to guide it up and down to the same spot every time or would it be ok free? For safety's sake i'd probably put something around it. Then i have to think about blackout fabric around the whole thing and if side guiderails would get in the way. This is going to get really expensive if i end up building a giant railed box for my giant metal AR glass camera and light covered box to ride up and down inside of.