Recent content by Dennis C

Chabal, Did you use a Bolt and cut the head off, or use "all thread"? What I would be afraid of is removing the existing bolt / all thread. If the thread locker is bonded tight enough, you may pull the threads out when loosening the bolt / all thread. If that happens you will have to increase...

Hey Chabel, Glad all is well with you and the bike. To be honest, I wouldn't worry about the bolt / thread. The bolt has a rolled thread (Forged) and is very strong, and the crank has cut threads which are no where as strong. An 8.8 bolt is medium carbon steel where a 12.9 is alloy steel. Both...

Jim, Good story! I believe it was Galileo and Torricelli who figured out that due to atmospheric pressure, a pump can only lift water a max of 34 ft . That I fully understand. It's actually the atmospheric pressure pushing the water up the well to the pump and not the pump "sucking" it up...

Thank you, I have a much better understanding now!

"It's not clear why you would want to do that" I don't want to but I know if I do, it will suck air, (I've done it quickly to confirm my suspicion) so if I installed a pressure gauge, what would it read? 5 to 6 psi? or vacuum?. I understand the A has to be greater than R, just wondering why if...

Thank you SteamKing! Excellent info from the link also. I take it the 1.43 psi is from the 3" Hg , (29.9 =14.7, roughly 2 to 1 ratio) and the total is what I thought it should be. Now, two follow up questions. If I open the blow off valve on the pump suction strainer, it will suck air in, so it...

Simple (I hope) pump question. With the pump not even running, would like to know what my static NPSHa is if I had a flooded pump suction with 10 feet suction head of water and a vacuum of 27" Hg above the water? Basically it is the hotwell from a condensing turbine exhaust after the steam...

You need to get out in the field Vishal If you put an amprobe on a motor with no load, current draw will be vey low. So: Volts (Constant) X Amps (Very low)= low power produced by the motor (and supplied to the motor) If you load the motor Volts (Constant) X Amps (Higher) = Higher power produced...

Well, if it is power supplied to the motor, I would assume you mean watts, or: Volts X Amps If it is the power developed by the motor it would be that minus the losses from efficiency, correct. Power produced by the motor would be a function of load, a motor uncoupled to a load produces minimal...

How deep is your vacuum? I agree with QD, bolted flanges are easiest and safest for deep vacuum's.

Vishal, "But i don't know what effect changing gear has in the wheels" Yes you do! "I would be in the first gear when i go uphill because i would get more push than i would get from starting at the second gear" "push" is torque. More "push" less speed! When you are in second gear, you get more...

Have you ever done any practical work with motors (as opposed to theoretical)? "No i havent. I am in the second year of my under grads, so its all theoretical for now. Thats the problem i guess." RFMatt, I understand the reason for a gearbox on a vehicle, I wanted to see if Vishal does. He...

Well, that explains a lot. Sorry for the confusion on my end.

Hey OCR, just want to state my admiration for Carroll Smith. He took the fight for Ford to Ferrari and beat them at Lemans. The man was a genius and an real Engineer "In Theory And Practice". His books taught me so much when we started racing Formula Fords. May He rest in Peace! (sorry to go...

I would put it on a scale, you will know the force. And: Force / Area = Pressure. (lbs. /square inch) Measure and calculate the area. A durometer produces a dimensionless quantity I believe, not a unit of pressure.