As an EE, this is embarassing, but I don't work with electrical circuits much so ...
I am designing a DC distribution circuit for a meter house. We have a 24 VDC battery charger (Input: 120 VAC) that feeds DC circuits and a set of batteries. If we lose AC to the building (thus, the charger)...
I really don't use my PE license much around here, since almost everything we do is for internal use only. However, an engineer (not PE) came to me with a design that had to have a PE stamp on it.
Of course, the drawings had to go out today (Friday before Labor Day weekend). I basically turned...
A Management Question
Say I hired a young man, for his first job, and he's been on the job two weeks. He's eager to learn, does his job, and looks promising. We'll call him Johnny.
Now say another manager, same level as me, wants our senior manager to fire Johnny. This other manager has been...
The patent shown at: http://tinyurl.com/5nk8x describes a modification to be made to the squish area on top of the piston, by placing grooves on it. I understand this technology is used in racing, as well.
Some friends on a Harley-Davidson bulletin board posted a question as to whether this...
Note while this is specific to my air-cooled V-twin, I believe other air-cooled motorcycles could experience this problem. I've presented this problem to several people, but no one has a viable solution yet. I'm hoping someone here might enlighten me.
My '95 H-D Sportster 883/1200 (60K miles)...
I'm getting ready to get a valve job done on my V-twin motorcycle. I'm wondering about polishing the combustion chamber (before/after the valves are ground?). Some people polish the whole chamber, while others do just around the exhaust or intake ports.
Polishing smoothes the air flow, but I...
I also posted this in the Automotive Engineering Forum ...
I'm trying to come up with a slick (and cheap) way to control oil flow thru/around a cooler on an air-cooled motorcycle.
When the oil temperature reaches, say 190F, I want to gradually switch the flow thru the cooler.
I found a...
I am designing a control system around A-B SLC500's. There will be one processor on each of two compressors, and one central station processor. The compressor SLCs will communicate with the station PLC as a supervisory control system.
I started to use Ethernet, but the sales engineer suggested...
I'm trying to come up with a slick (and cheap) way to control oil flow thru/around a cooler on an air-cooled motorcycle.
When the oil temperature reaches, say 190F, I want to gradually switch the flow thru the cooler.
I found a self-contained temperature valve that will close/open with...
I'm involved in a discussion in another forum regarding motorcycle engine temperatures. Namely, a V-twin, air-cooled aluminum engine.
I say oil temperature (in the oil tank, not the engine) should run between 180F and 220F for proper evaporation of water and proper lubrication. Many disagree...
We have had 3 small fires at distribution regulating stations, occuring near a control cabinet. The cabinet houses a "motorized regulator". We send a 120VAC signal from our RTU to a small motor, which turns the actuator screw on a Fairchild Model 10 or 64 regulator. The Fairchild...
We are experiencing RTD failures on the high temperature discharge measurement on a reciprocating compressor. This is a 4-cylinder compressor (2-stage, I think), and the RTDs on nozzles #3 and #4 fail after a few weeks.
We think it is from vibration, so we bought new AllTemp RTDs that were...
I (think) I just read that forged alloy (hypo eutectic) pistons are bad for air-cooled engines. I don't understand it all, but the author indicated that aluminum with > 12% silica were considered hyper eutectic, less ductile, stronger, and had less heat transfer (a good thing?) than those with...
As a member of a National Council of Examiners for Engineering and Surveying (NCEES) exam board, I learned a lot about the requirements to become a Professional Engineer or Land Surveyor. Basically, the individual certification Boards are charged with assuring that the individuals certified as...
This is a new forum. While it is very similar to the "Measurement & Control Instrumentation Engineering" forum, I thought I'd offer some thoughts to how to make it unique:
This forum probably shouldn't address field instrumentation.
It is not specific to measurement problems/solutions...
This was posted in another Forum (Measurement & Control Software Engineering), but I thought I'd also ask here. This Forum seems to get more traffic. Please excuse the redundancy.
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I want to install a PLC network to control some compressors. I will have one PLC/compressor, with the...
I'm too old for this ...
I want to install a PLC network to control some compressors. I will have one PLC/compressor, with the PLCs connected together thru "Ethernet/IP" (Allen-Bradley).
The problem is that I need to pass nearly ALL of the information contained in those PLCs to a...
Harley-Davidson has introduced their "new" SYN-3 synthetic oil (20W-50 only), which they say is good in both the engine and transmission (and primary in Big Twins). They previously warned owners against using synthetics for any service.
I have read reports that some Sportster owners...
Can someone tell me what "Vector" is?
Our SCADA group wants to use the PI database system (from OSIsoft) to gather data. I understand they are using a Vector (spelling?) system to bring data in from RTUs currently, BUT it doesn't work with PI.
I'm just a simple control systems...
I was considering the use of Spread Spectrum technology to transmit control signals (analog/discrete inputs and outputs) from one building to another. These buildings range from 100 ft to 1 mile apart.
I was told that it would never work, due to the numerous, strong thunderstorms that roll...
