Quote
uncle_bob
Speaking of discoveries:
I have found a source for pretty good plywood with thickness options of ¾, 1, and 1 ½”. The stuff isn’t exactly cheap. My guess is that on a 2X larger printer, ¾ by it’s self isn’t going to do the for the horizontal plate in the middle of the stack. It *might* be thick enough for the top or bottom plate in the stack. I’d also bet that 1.5” is thick enough by it’s self for the middle plate in the stack.
[www.buyappleply.com]
More or less the idea:
Motors mount to the middle plate (below it), so the bottom plate is not got a lot on it – use ¾”
Middle plate has a lot on it and a lot going on - use 1 ½”
Top plate still has a lot going on – use 1”
The question to the group – is that enough?
The top and bottom platens really don't experience any loading, they just maintain the positions of the lead screw.
The middle substrate can be bolstered with jack-screws, turn buckles, wooden support post, etc to the bottom platen.
I need to see a CAD data file to make a sound suggestion, that said here's an idea to consider.
I like the idea of using wooden dowels pocketed and glued to the middle substrate and bottom platen.
This will allow you to use thinner, less expensive material alternatives.
Process:
1 Clamp together the middle substrate and bottom platen together.
2.1 Drill holes through both pieces of plywood where you want the supports located.
2.2 Drill Alternative: you can drill through the bottom platen,
and machine a pocket on the back side of the substrate to preserve the surface finish.
3 Separate the two platens with an object of consistent height, (e.g. 1-2-3 blocks).
4 Insert wooden dowels, and glue.
5 Excess dowel length should protrude through the bottom platen.
6 Cut excess off.
Did you figure out a method to mount the lead screw bearings to the top platen?
