The Ametek-Lamb 122178-18 are nice motors. They really are the only motors that can sustain a high enough flow rate that us mere mortals can afford to buy. In flow through fixturing the key is a high CFM, not a high vacuum in inHg or inH2O.
https://www.centralvacuummotor.com/lighthouse.htm
This is where I always sourced my motors from. Cheap and they worked very well.
That website is a real trip too. Straight out of the 90s
Thanks for the info!!
Brent over at Central Vac knows his stuff. He’s not a CNC guy but if you have questions, he is the guy who would know.