Recent content by pete worthington

The cross-hatched pattern is made using a cylinder hone and their purpose is to help seat the piston rings to the cylinder wall as the engine breaks in.

This might be better stated as: ... in certain applications the proper design of a propulsion system can produce limited shaft deflections that allow the use of lip seals.

I used Fundamentals of Classical Thermodynamics, Van Wylen and Sonntag: back in 1983. I got in touch with Sonntag a few years ago asking him questions about the Second Law and it's Philisophical ramifications.

I saw a NOVA special on NASA's Mars mission. There was 20 minutes or so on the parachute design and problems with inflation. You may want to look into that.

Screws are often manufactured on screw machines, which are metal lathes that bring in round stock and automatically machine and thread the screws. they can work very fast. I have 13 stitches in my left thumb to prove it ! Small gears could easily be stamped out of steel sheets (like cookie...

Lingering Electrical Smells My toaster oven shorted out this morning. My wife saw a flash, a small flame and then very limited smoke. Then the smell...oh that lingering electrical stink that permeates the air spreading at the speed of light thoughout the house. I qiickly removed the toaster...

Sorry about that Bill :eek: and to anyone else who hit that site. The actual site is www.shaftseal.com. I suppose if shaft is a porno site then shaft seal would be a contraceptive site :rolleyes: A week never goes by in my high school physics classes where physics terminology gets some giggles...

How about the Memorex audiotape commercials from the 70's and early 80's. There was a rather large female opera singer next to a piano. They had her live and recorded voice break the glass. was this a sham?

It could look like this : Look up the seven principles of Unitarian-Universalism www.uua.org. These are principles that are derived from all world religions/philosophies; predominately Christianity, Judiasm and Religious Humanism. These principles look/feel similar to the "Humanist Manifesto"...

I'm assuming that you want: dripless seals, shaft spins less than 5000 rpm, 100m depth. There are a few companies that make graphite faced mechanical seals, "stuffing boxes". The most common is at www.shaft.com. Look at this site for a visual. I've seen many of these. They use the elastic...

I agree with Clausius2 here. The Delta P is referring to pressure at a point; the dynamic pressure. It is the difference between static and stagnation pressure. Expanding its use to "across" something, specifically a pump would not be appropriate as it is written. Crane 410 does not deal with...

The OP first question asked about the relationship between force and momentum, That relationship is: F = dp/dt where Force equals the change in momentum divided by the change in time (during the collision) This relationship is not evident in the arm...

The gaps are created by the larger material interfacing and colliding with other larger material. Why does the smaller material fall through the gaps?

My thought is you have posted an interesting multi layered question which has 5 or so question marks. When I first started posting in this forum 2 months ago I attempted to keep the question straight forward and singular in focus. If you get some good hits on the initial thought question then...

Observe ? Light