Recent content by rickp

Thanks for all your thoughtful responses. I will start by making an explicit connection between the dc return and the ac ground and see how it works.

I am working with instruments that have the 120vac mains ground pin tied to the chassis. The 12vdc and 3.3vdc returns are also tied to the chassis. The dc is used for some detectors, solenoid valves, stepper motor, small fan, and logic. So there are some quiet and some noisy dc devices. In...

We routinely tap 6061-T6 and 2024-T3 or T4, and 7075-T6. They have reasonable strength and are hard enough to tap cleanly. There are formulas for determining the tread depth so the tapped thread has strength equal to the machine screw used in it. I try not to go less than 2 x diameter in...