I OD plunge grind forms into cylindrical parts. I switched to CBN and am very happy with the results. However, CBN wheel life isn't as long as I'd like it to be. Any advice? First, are you using a water-based coolant or oil? With CBN, using oil instead of a water-based coolant provides much longer wheel life. And I'm not talking 20 percent longer; I'm talking 10 to 50 times longer wheel life. So if your machine is enclosed and has fire-suppression equipment, switch to oil. If you're already using oil or can't make the switch, you can adjust the plunge speed and workpiece rpm.
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