This is the style of CRP's drives and rack I used on my plasma cutter.
I got it going in March 2013. The gears and racks still show no real signs of wear. I do keep them greased up though. The racks came from McMaster Carr. I had already bought those well before I ordered anything from CRP's. I think good lubrication is the key to longevity on gears and racks. That and not to over tension them. My gantry is pretty heavy. It is 5' long. Some cuts I make at 220 IPM. The pinions have never jumped a rack tooth. I only have mild tension applied.
I have had to replace one roller skate bearing in that time, but other than that, the drive line has been flawless.
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