Reversing single phase motor… brushing up on theory?

I'm trying to repair a car lift ramp which is powered by a single phase AC motor, the motor has two capacitors on it. Just need to get my head around the 4 wires that go to the motor to eliminate them from my search for the fault 🙂

When the contactors are 'pulled in' to make the ramp go up, th

Floor Drains Full of Concrete

We have a new building and have discovered that several of our floor drains are full of concrete. Are their any creative ideas out there on how to remove the offending concrete without digging up the floor? This is not a small amount of concrete;the traps are full. And, yes...it was vandalism; the c

Gunnery

Hello everybody

Talking to a friend yesterday evening over a curry, and he was saying how his late father, who was a soldier, used to sabotage weapons if they were abiout to be captured by the enemy. Artillery pieces, 50mm calibre up. He said the barrels, rifled of course, are made in several s

UPS Output Voltage

We are having a problem with the UPS output voltage which will be used for the instrument cabinets. The cabinets require 240 V (Line to Grounded Neutral). The UPS output voltage is 240 V (Line – Line) and the UPS vendor mentioned that none of the line can be grounded. The UPS has voltage syste

CNC Cutting of Complex Shapes

Is modern cnc capability able to reproduce complex shapes. We have quite often been asked for Figure skating blades which are no longer produced and I wonder if these could be reproduced by copying. The shape can be quite complex, especially that of the rake which is used for jump take offs. Can a

Is the Bias Real Culprit Here?

Just think for a moment. There is a disaster in the world's most powerful country. The country has humanity's best engineers. Best Scientists. Most powerful supercomputers. Largest corporations.

YET, it has not been able to fix the oil spill.

Even the best men and machines in armed for

Wind power

How does a wind power generates constant frequency electric power they all rotates in different speed in different time right.How do they synchronse each other in all means?

Mercedes C240 Problems

I have a 2001 Mercedes C240 and recently got a ESP visit workshop malfunction, the check engine light came on, the car vibrated and slowed down. I had to shut it off and restart. I was told I needed the YAW sensor. I replaced sensor and now check engine lights is on again. It says that cylinder #6 m

Density of H20 @ 150 C & 600 psi

Can anyone please show me how to look up Density of H20 @ 150 C & 600 psi pressure (Co2)....I found a water table which shows 916.69 kg/m^3 but it does not show anything @ pressure. Isnt density related to both pressure & temp.?

Kitchen Renovations, Part 6

Lessons Learned

For the final touches, I finished up the trim around the floor, doors, windows, and ceiling and installed the dishwasher, oven, and microwave.

The one thing in this kitchen project that I had going for me when I started is that I had intended to gut the kitchen, as

230 V

Sir in 230V,1ph AC supply is 230V the RMS value?So what does the volt meter always measures the RMS value?

Stem Cell Therapy 'Damage' Seen

From BBC News | Science & Environment | UK Edition:

A new complication has been seen in a patient with kidney disease who received stem cell therapy, scientists have warned. Stem cells were injected into the kidney, but the patient suffered tissue damage and died from an infecti

More on IBM's Jeopardyputer

From mental_floss Blog:

I mentioned Watson, IBM's Jeopardy-playing computer, back in February. But the details were a little thin back then. Now, the New York Times Magazine has a full profile of Watson, and it sounds like this thing is a monster. IBM has been staging "live" gam

Humanoid Robot Justin Learning To Fix Satellites

From IEEE Spectrum:

Justin is a dexterous humanoid robot that can make coffee. Now it's learning to fix satellites. Justin was developed at the Institute of Robotics and Mechatronics, part of the German Aerospace Center (DLR), in Wessling, Germany. The robot has different con

Partial Lunar Eclipse Coming On June 26

From SPACE.com:

Two weeks before a total eclipse of the sun crosses over the South Pacific Ocean, the moon will put on a sky show of its own — a partial lunar eclipse on June 26 that should be visible from parts of North America, weather permitting. The lunar eclipse will