Mechanical design for a pneumatic power drawbar to allow Tormach TTS to be used on my PM-940. This project has to wait until the mill motor upgrade is complete, at which point I can purchase the TTS tooling and mount and install this. Not a very complex part, it’s basically a floating steel plate attached to a 4-stage pneumatic cylinder, with a separate Belleville assembly added onto the drawbar. The cylinder should produce upwards of 2,500 pounds of force, which should allow for a very strong Belleville stack to retain the TTS tooling. Since I’m hoping to run up to 3HP through the spindle, I’m kinda entering unknown territory compared to the Tormach machines, so there’s a good opportunity to do some experimentation and figure out the correct setup.