[Ddawg]

Here is a link to an adjustable hole saw. I use this to cut thousands of feeder holes in every cover we own. I did upgrade it to a carbide lathe bit though.


https://www.amazon.com/General-Tools-55-Cutter-Adjustable/dp/B00004T7P1

One thing to note when ordering one of these cutters, make sure your drill press will operate at a slow enough speed to safely use it.
I have a medium size drill press I bought from harbor freight, it has adjustable speeds, but It won't go slow enough to safely use the cutter (according to the warnings stated on the cutter package).