Stell frame cnc 1500X1000. Adjustable table your opinion please

[ba99297]

Boyan thanks for your answer.

#1
For me its very simple. Depends on table size. For under 1m everything more than 0.05 anywhere is unacceptable. For bigger tables 0.1 deviation on height is the limit. So hiwin is right.

I guess when you measure in mm, so when you say 0.05 you mean 0,05mm and when you say 0.1 you mean 0.1mm right?

So even if i can see light pass between the rail and the straight edge but the 0,02mm filler strip can’t pass through the gap you think is OK for a 1800mm long table?
Really after epoxy cure, when you attach the straight edge on the epoxy surface is there any gap between the epoxy and the straight edge? The epoxy surface is perfectly flat against the straight edge? If the answer is YES i have an idea here

http://www.mycncuk.com/threads/9511-...t-work?p=76521

Vagelis

[Boyan Silyavski]

Yes, i meant in mm. But to tell you the truth i found that the hardest thing is to avoid for dust not to get trapped in between when mounting, cause that could f%%ck all previously achieved precision. When i lay the rails i lay the edge first and scrap them against the epoxy so no dust goes trapped there. And there is a lot of particles of it even in a new workshop :-)

My straight edge was perfectly flat against he epoxy when i was happy with the result. But even in my best result, at one end of the bed under one of the rails there was need to shim / if you read the whole thread about my machine you will remember that i was experimenting a lot with the epoxy pour, so i found the way to do it properly/

So yes, to your idea about the DIY epoxy straight edge, but remember the main thing i discovered when pouring 3m rails, i needed to over extend the epoxy both sides 25cm/?? read the thread again but make it so to be on the safe side/ so it shrinks there, after that just cut it to the size of the profile.Similar to what you will do with the meniscus.