I have a Harbor Freight bench top siphon type blast cabinet that won't pull the blast media through the gun. I'm using Tractor Supply Black Diamond medium grit coal slag abrasive. It is dry so moisture is not the issue. I've tried four different size ceramic tips supplied with the blast cabinet and varied the air pressure from 80 psi to 135 psi. Also replaced the suction hose with a clear hose and verified that the gun is in fact pulling the abrasive up to the gun. I opened up the internal nozzle size with a drill to increase the amount of air passing over the suction/inlet and still no abrasive passes through the gun. The suction hose has a 3/8" ID by 10" long tube on the end that is buried in the abrasive. I squeezed the open end to reduce the inlet size thinking too much abrasive was being sucked up the tube and blocking the gun inlet. Still no abrasive passes through the gun. What do I need to do to get this thing working?
Thanks,
Tom S
Thanks,
Tom S