Re: [CAD_CAM_EDM_DRO] Re: - stree relieving

Rob,

Standard procedure for a weldment as a cnc router machine base would be to stitch weld pads where rails would be bolted atop the tubing. Like 1/4 X 2 stitch welded the full length then get it blachard ground. It provides thicker material to tap and does not sacrifice the integrity of the tubing as removal by grinding including the welds would do. Then maybe a square pad underneath at each corner surfaced as well with bolt pattern to accept legs. That would be a great platform to start from.

Ron

Robert Lyman <robsheplyman@...> wrote:

These notes are correct. Generally stress relieving
is unnecessary and to get it right the process must be
controlled with reasonable accuracy.

For my cnc router I plan on welding a rectangular
frame of 2 x 3 x 1/4 wall tubing. Then I will stress
relieve the weldment in a flat fixed position. Next
the plan is to blanchard grind the top and bottom to
minimum clean up, asking the grinder to hold flatness
and parallelism to a best effort (+/- .005). I will
then drill and tap the holes for the x-axis linear
guides on the bottom of the frame. The top of the
frame will get tapped holes for mounting a cast
tooling plate, facilitating a replaceable work
surface.

Rob.


A note on stress relieving for general

> purpose
> welments: Don't waste your money.
> >
> > Ron
> >

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