MK1 Steel router build log 1500x800x200

[driftspin]

Aren't you going to put brace at the bed, at the long axis?

Frame bracing.

Well no...well not yet.

Span is 2x1650mm span 120x80x4 mm box section....

plenty stiff one would think...

In Theory,

At 400 pounds of moving gantry weight 0.0027 inches vertical deflection would occure ... but the bed would move also. so. well.

At a more realistic 100 pounds 0.00068 inches

This would only be a problem if the workpiece was stiffer than the box section right?


In my design there is no absolute movement between router bit and workpiece when vertical X axis flex would occure. So no accuracy problems there.


By now total weight is 190 kg with no gantry...

I do believe "ringing" might become a problem... the assembly has a +/- 1khz resonance frequency.

I might fill her up with something like sand or epoxy mix concrete or something need to look in to that.


For shaking appart there is something to be said though.

Bracing at the bottom should solve x axis flex.. some of it anyway. It felt plenty stiff  those diagonals are out of the way great.



Y/X direction flex / bracing... yes.. well.. erh there is going to be cabinets installed ..

And maybe a few bits like: compressor airbrush type , vacuum cleaner, dust removal cyclone, cooling for spindle,
electronics cabinet.






X-direction flex bracing
I cannot yet fill the under the bed space with diagonals... yet.

There will be bolt on triangles when stuff like that is sorted.


Y-direction flexbracing

There is a 3mm thick plate 1000mm x 200mm with curved edges between the legs.. bolted with 4xm10 threaded rod to the legs.. plenty long m10 rod +/- 100 mm for building up tension.



Diagonal cross frame flex.

At this time i have prepared 4 m12 screws at the bottom of the legs to level the frame
And help with aligning icw anker bolts to the concrete floor.


When it is level and all legs (set screws) are in contact with the floor.
It feels incredibly stiff.


When now a set screw is set out of alignment by a 1/4 turn (M12) the table is wobbly ... proof of stiffness...

Any thoughts?

I have no good idea what the shaking forces are like in real life.

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