re:Cnc router help

Doug,

So the long Z axis is "not used" most of the time? It just 'sticks
up' in the air (adding moment load on EVERY move). And when yopu need
it you "prop up" the gantry cars?

Ballendo

>I had the opportunity to visit Les yesterday and look at his
>machine. We discussed the problem of long Z travel, which I also
>plan for my router.
>Our tentative solution to the problem is simple. Build the gantry
>for about six inches table clearance (good for 99% of the work I
>will do). Attach it to the railcars in a manner that allows you to
>install riser blocks if more travel is needed.

>The loss of rigidity with riser blocks and long Z-axis overhang
>won't be a problem for me. The only time I will need them is when I
>am cutting foam.
>The rest of the time I will have the stiffness needed for milling
>aluminum sheet.
>Doug