My pressure was a 30/50 I got a 40/60 adjusted pressure in tank to 38 lb kick on at 40 then shut point are still in contact but will not run pressure drops to zero then maybe 10 to 20 seconds later it kicks back on

It's a bit all over the place here in the question.

The basics are the tank pressure needs to be 2lbs less in pressure the what the pressure switch is or 2lbs less then the pressure switch is set to shut off.

Check for water logged tank after its air pressured. Tap side of tank and it should sound hollow about half way up. If not then a bad bladder in tank.

Also when the pump runs and pumps up pressure see if the pump pressure gage shakes while building pressure in the water lines this is a symptom of a bad bladder in the pressure tank.

If captive air bladder is bad then you will have short cycling on the pump/switch

This should help set you up.

How to adjust water pump pressure, pump cut-on pressure and pump cut-off pressure - private pump and well system do-it-yourself repairs

http://www.inspect-ny.com/water/watertank.htm