Advice on Mammoth CNC Router Build - Steel Framed - 2440mm x 1220mm cutting area!

[ba99297]

Sorry for interrupting but I have an idea
Could it be possible to combine both methods (epoxy and shims) BUT instead of epoxy use clear coat for car painting. The clear coat will be the mean to show us which is the true level between the rails, so then we put shims and putty and fit the rails on that level. For that size of machine that may be 2-3 kgr of epoxy will be needed, the difference to the final cost will be significant After the putty pures we could even took off the clear coat as I don’t know how strong it is in getting pressure from the rails. In that way we don’t pay too much money for the epoxy as I think clear coat is much cheaper and we won’t waste too much time to true level the rails as we use the clear coat as guide. Regards the pure time of clear coat we could use a catalyst that will make pure time longer.
Also instead of clear coat we could use anything chaper that has self leveling properties
Just an idea I don’t know if it is correct

Vagelis

[EddyCurrent]

Also instead of clear coat we could use anything chaper that has self leveling properties

water ?

But the idea with epoxy is that it finds it's own level then hardens to that level and job done, with the method you suggest how would you measure the depth of clear coat (water) to know that the frame underneath was level ?

[ba99297]

water ?

But the idea with epoxy is that it finds it's own level then hardens to that level and job done, with the method you suggest how would you measure the depth of clear coat (water) to know that the frame underneath was level ?

What i suggest isn’t so different with the epoxy method. Clear coat is also a resign but I think much more cheaper that will harden when it cures. Water isnt hard unless it becomes ice. Water could give us a perfect level but the question is how we could “capture” that level. What about self levelling floor resigns ?

[JAZZCNC]

What about self levelling floor resigns ?

The problem comes from the type of resin.? I think Car paints and self leveing Floor paints which are manily polyester resins contain high solvent levels which evaporate and can cause sinking etc.

[Wejjmeister]

The problem comes from the type of resin.? I think Car paints and self leveing Floor paints which are manily polyester resins contain high solvent levels which evaporate and can cause sinking etc.

They wont shrink or sink but they do not harden to the same levels as paints are meant to be somewhat flexible to resist cracking etc, so it wouldn't be suitable for this particular job as it would 'give' unlike the epoxy resins used in these forums before which cure fully.

[JAZZCNC]

They wont shrink or sink but they do not harden to the same levels as paints are meant to be somewhat flexible to resist cracking etc, so it wouldn't be suitable for this particular job as it would 'give' unlike the epoxy resins used in these forums before which cure fully.

I belive it does shrink and it's why Only Solvent free Epoxy resin is used for Epoxy Granite to avoid voids, sinking and cracks appearing when solvent evaporates.!!

Regards the steel and bracing then yes you could reduce quite a bit of that steel.

[Wejjmeister]

Next round guys Mk3!




Removed steel form sides and changed bed supports. Any better? Saves a lot of excess steel.



Started on ideas for rails etc... let me know your thoughts please.





Think this should provide a strong setup, also thinking about using BK blocks to mount Ball screws? Will these be suitable?

Thanks!!