Stell frame cnc 1500X1000. Adjustable table your opinion please

[ba99297]

Hi every body
Wednesday morning I went to a friend of mine who is a wood processing machine constructor, one of the few that manage to survive in the Greek economic environment.


http://www.nikolaidismachines.com/index.php?lang=el

Previous week I gave him my cnc gantry in order to put it in the planer (a 6 metres one), in order to mill it and make a datum surface for the the hiwin rails.


It is possible that the frame (1900mmX1200mm) can be handled from that planer so i have it milled for the x axis rails

This is the Result

Dial indicator has been used for zeroing the piece

After milling the gantry I had to do the drilling and taping
My friend in order to help put the gantry in a drilling and taping mill (the blue color machine 3-4 meters long) so that I could have the threading in a more precise way (other than drilling and taping with hand). This was one of my big nightmares ( how to drill and tap nearly 40 holes on 14mm steel).
He took me no money for that job. I would like to thank him.
First the machine spot the holes

Then Drill and tap



Even after milling the surface is not 100% flat against straight edge
I wouldn’t expect zero level accuracy from a 6 meters long machine
When i put the straight edge against the surface, i can see the light pass through but the 0,02mm filler cant pass . So we are talking aboutan error smaller than 0,02mm.
In order to get the best result i will shim the y axis rails. I remember Deans' word many times. How right he is ? He told me " Vagelis even after epoxy method or milling, it is possible that shims will be need in some spots". I don’t want to use the epoxy method, as i think that shimming is more challenging and of course more difficult.
I will be glad to hear every comment

Here is a video of that day
https://youtu.be/4VUnQhaaJIE

Vagelis