Recent content by charland

Hi guys, This has been rattling around in my brain for some time. It's strictly anecdotal but bothering me just the same. Why does my wife's cigarette smoke get pulled out of the car window when I'm driving? Bernoulli's law states that a fluid at a higher velocity will have a lower pressure...

After using SolidWorks for more than 1.5 yrs I took the essentials course. There were quite a few things that I already knew but I also learned about some bad habits that I had. Some of these bad habits were the root of little "glitch" mistakes that didn't make sense to me. My...

Gentlemen, I am in your debt. Thank you Charlie

Using a scalar drive VFD: wouldn't this be similar to picking an off the shelf, AC motor and just selecting the correct pulley ratios to get the speed I need? I can get a custom pulley machined if I need something between the commercial sizes. The way I understand it, an AC motor works off of...

Thanks Keith, I forgot to mention one last part. It runs on 240 hour cycles. Do VFD's have problems with sustained run times? Also, any recommendations on VFD's?

Hi guys, My apologies if this is a simple question that has already been answered but I wasn't able to find anything helpful in the archives. I'm designing a glorified dryer. The point of this machine is to tumble clothes at a specific speed over a specific time to condition them for other...

Thanks to everyone for their input. I think we'll switch out the starters for 24V and run the rest of the 12V stuff off of a converter as suggested.

Hi OperaHouse, No doubt. This will be a statement for the purpose of discussion. Similar to the way that the recent Earth Day "lights off" hour had no real impact on Green House gases but still caused dialogue. We're counting on 50 W per person as we expect out of shape people and eight year...

Perhaps I don't understand how this can be used. We have 24V and need to power a 12V system. The 24V system could be anything from anywhere so we have no control on that equipment. An additional piece of info is that the starter draws from 100 to 800 amps while the rest of the vehicle...

I want to keep this as simple as possible considering our customer doesn't have much funding and they are only looking to make a simple statement about energy awareness. My plan was to provide a box with electrical outlets. Say 9 in total (all standard 120 VAC, 15amp) 4 from power provided...

I have an application where my customer wants to have a "Green" musical event. The idea is that there will be a number of cyclists generating power with some kind of meter reading the power generated and then comparing it to the amount of additional power taken from the grid. I want to know if...

We have built some military vehicles that operate on 12V but have 24V capabilities. We've done this by using a battery bank with some of the circuits coming off of one set of batteries wired in parallel (12V) and then the other circuits coming off both of the sets of batteries wired in series...

Something to consider about the pump. You will need to control the VFD using data from the plumbing. If it suits your system, you can simply use a pressure transducer and a pressure accumulator. A PLC will speed or slow your pump to maintain the pressure in the accumulator. If you don't want...

OK, so if I have a 4gpm pump at 1000 psi, can I use 2 gpm at 1000 psi and have the other 2 gpm going through the bypass circuit? Or will I lose all pressure once the unloader valve opens?

I am designing what can best be described as a carwash system. There is a high pressure pressure pump (positive displacement, piston) and a variety of things feeding off the pump (spray bars, spray wands) and there is no way of knowing what the volumetric requirement would be depending on what...