Rather than buying a vacuum pump for clamping and veneering, connect Black Jack’s vacuum generator up to your air compressor as your vacuum source. You just need to make sure your compressor can supply 3CFM @ 90psi. Black Jack doesn’t state the pressure drop the generator can achieve, but all the retailers use 10psi drop in pressure for their example calculations.
Instead of using a pump, the vacuum generator uses the Venturi effect. Several sites show the handy diagram above to demonstrate the vacuum generator works. Compressed air is blown through a funnel which pulls the air surrounding the funnel along for the ride. Since this surrounding air is supplied by the attached vacuum line, it lowers the pressure in that line.
It looks like you’ll pay around $80 before shipping for the Black Jack Vacuum Generator.