Re: [CAD_CAM_EDM_DRO] Re: sourcing motion control parts - steel vs aluminum

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> I have always purchased A513/A500 tubing and A36
> plate. Some of it comes in clean and arrow straight,
> some comes in dog legged and nasty. T-slot looks good
> on big budget projects, but is pretty pricey. The
> process I have been involved with for custom machines
> is;
> Cut pieced and weld up frame.
> Stress relieve.
> Grind flat.
> Then machine features.
> My experience is that even with the cost of stress
> relieving and grinding you will end up with a cheaper
> frame at 4' x 4' An added bonus is the frame will be
> heavier and as a result of the weight/mass be more
> stable than a lighter machine.
> Rob.