standard gear cutting arbors aren't that expensive, but are often for standard module gears and the gear form is an approximation that applies to a given range

standard gear cutting arbors aren't that expensive, but are often for standard module gears and the gear form is an approximation that applies to a given range of gears. e.g. https://www.amazon.com/EVNSIX-Involute-Cutters-Milling-Machine/dp/B07P9QLJG9/ref=sr_1_4?crid=1UJ3KY43MRX7R&keywords=bridgeport+gear+cutter&qid=1674666890&sprefix=bridgeport+gear+gcutte%2Caps%2C132&sr=8-4 https://www.amazon.com/EVNSIX-Involute-Cutters-Milling-Machi...