I bought a simple 3-axis machine that uses a rotozip as a spindle. The machine is perfectly adequate for my needs in terms of power. I've noticed a problem lately, however.
If I have the gantry all the way to the extreme of the Y axis and then move it to the other extreme of said axis at the same height, the distance between the bit and the material increases! I've tried to get in touch with the manufacturer to get some troubleshooting but he's been slow to respond.
The problem may have existed the whole time but I usually cut very small parts that require less than 5 inches of travel in the x or y axis... bigger items are the problem now.
So I was thinking that I could fix this out-of-parallel problem by putting on a new bed (or a sacrificial bed), chucking up a big straight mill, and planing the work surface parallel to the bit. Would that be enough or are there adjustments to be made?