epoxy question

[driftspin]

Attachment 21861


Ok this is the design...

The bed and raised X Axis is 1 solid welded up part (heavy, easy over 100Kg with no legs attached)
Did any of you put concrete in box section?
Heavy is good :-)

Legs and diagonals (50x50X4) are welded together, leg assembly will be a bolt on to the bed.
Should be plenty stiff.


I know a raised gantry is less rigid.
There will be reenforcing braces inside the raised box section of the gantry to
counter flexing forces in the Y directions, one disadvantage of a raised gantry...


The welding heat warped the boxsection a bit.
For what i can messure now, overall horizontal accuracy = +/- 1.5 mm (2Mtr Spirit level)
No flat surface to be found on any side of the box sections, no really, none of them....



Ok so the epoxy will be poured on all horizontal linear rail and bearingblock mounting surfaces (X and Y).
The aim is a +/- 60 mm wide epoxy mounting surface, for rail and bearingblocks
(80*120*4 box section has round corners 60 mm is about the max flat surface to be poured on)
2.5 liters epoxy will be more than enough.
Aiming for 5mm+ thickness.


I will mount a temporary leveling bridge (or maybe 2, More? X boxsection 1850mm long ) for the epoxy to flow between the 2 X rail mounting surfaces.
So now the X rail mounting surfaces will end up in the same horizontal plane.


The gantry will be poured simultanious, but upside down first (bearingblock X, and bottom Y rail, mounting surfaces)
I will also mount a temporary leveling bridge for the epoxy to flow between the X linearbearing mounting surfaces


After curing, the gantry will be flipped in normal position and placed in its natural position but no linear rail mounted.


Since gantry bottom X/Y surfaces are now in the same parallel horizontal plane,
it can be placed on the level X-rail mounting surface,
the top Y rail surface can now be poured in the same parallel horizontal plain.


I hope this discription is kinda readable...


Sorry for the English, i am not a native speaker...