Do I really need my machine to run at 1000ipm?
No I don't and there are several reasons behind this. First the savings in machining time are so small that it might as well ne nil for 2D and 2.5D machining. For 3D machining the savings are nil. It is not practical to cut at 1000ipm on a homemade machine. The better option is to make 1 deep cut at a slower speed rather than 5 or 6 shallow cuts at high speed. This is why many commercial machines cut in 1 or 2 passes. When it comes to 3d machining the maximum speed of the machine is irrelevant with accereration the determining factor in overall machining speed. A larger machine which cannot get up to speed quickly will be slower than a smaller light weight machine with high accereration.
Now don't get me wrong. It is nice to have a machine that can quickly get from one end of the table to the other but there are limits to how fast you really need to go.
It isn't how fast your machine is it is how quick it's fast.
just my thoughts on the matter.