im wondering what materials an accurate CNC router could be made of?... MDF, steel, aluminum, HDPE, what about wood, or a large thickness plywood? (like 1 inch?), would it be possible to use these materials as well, and still achieve the same accuracy as an MDF machine using similar designs?
has anyone built a machine of this size out of rectangular tube steel welded, perhaps with tube or plate steel gantry? if so.. what did the steel cost you to build it?... id assume oversizing the steel frame, with some cross braces of slightly smaller diameter to give sort of a set in area to lay a piece of MDF or plywood for the table would be the way to go... weld on the angle iron rails and from there it comes down to gantry design... im going to the hardware store this week to check prices on square tube steel, small diameter i beams, and plate steel to get an idea of what a steel machine would cost... would yield a much stronger machine than mdf or plywood, and might not cost too much more.. so it could be worth it (if you have access to a welder)
if i cant do that im thinking of making the table frame out of 4x4 wood, braces with 2x4 wood, with a 1" thick plywood gantry...
i just dont think anyone anywhere near me carried MDF, so im keeping the options of alternatives open
im looking to build a machine with 48x24 inch travel, i believe that short, leadscrews all around should do fine... i probably wont need to use a chain driven X axis until i build a machine with a 4x8 foot machine later...
so im thinking of using a design SIMILAR to joes.. but not exactly... i think usnig fully supported angle iron rails for the skate bearings to slide on might be better, and easier to put onto the machine
extreme precision is nice... but really not as important for what ill be using the machine for as other things people could use them for, im a luthier, so ill be using it to cut wooden guitar parts which will still need to be sanded and refined anyway