Quote Originally Posted by JAZZCNC View Post

#4 Yes it's a much stronger design than a single piece of profile. It's my own design that I've used for years and it's well-proven on lots of machines.

#5 The surfaces are made flat and on the same plane by coating with a fine spread of Epoxy metal (not epoxy resin) and then machine frame is turned upside down and placed on precision Granite surface table.

#6 The fronted mounted rail is to give maximum clearance under the gantry and the top-mounted rail is to give greater spacing between rails and support the Z-axis rear plate.

#7 Yes 120x80. They are mounted by bolting into the lower flat profile from the top. The top profile is bolted to the flat profile from the underside, there are also aluminum keys inserted into the slots to stop any movement.
#4. Makes sense. It basically becomes an incomplete 120x200 profile shaped as an L, which has way more moment of inertia compared to a 90x180 profile. How are they mounted together? And what about using something like a 100x200 profile? I guess that would be of similar strength as the L-shape made by 80x120, but easier to use.

#5. This is interesting. So without a flat surface to rely on, you probably woulf have to go with epoxy resin levelling?

#6. Of course, why did I not think of that immediately. Oh well, it makes sense now. Is it much more difficult to get it aligned like that, compared to mounting both on the front?

#7. So you are drilling holes through the profiles for the bolts?

Bonus question: How much approximately do you sell this type of machine for? It looks really good and it sounds like a lot of fun to be making money building CNC machines!



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