Recent content by ttdmt

Does anyone know where to get data on 304SS fatigue limit? The number of load cycles the material can take at a certain stress? My college text book Mechanics of Materials by E.P. Popov has a graph for 18-8 which is a generic term for 304 but does not say if the specimens were annealed or...

I am looking for a manufacturer of large cross flow fans. Also sometimes called tangential fans. The application can fit up to a 44" long fan wheel. The wheel diameter will probably need to be from 10 to 20 inches in Dia., package can accomodate a range. I would like 45hp at 1800RPM at...

Thanks for the equation. Can you give me a couple of manufacturers, preferably ones with the K factor data on line. I am trying to design a sprinkler. I have to do a rain test and the spec calls for .8gpm to fall on the specimen at a 45 degree angle. The test specimen is good sized. So...

Thanks, I think I will do an try a couple experiments. This should be invaluable to imform those efforts. All The Best, TTDMT

How do you do a simple approximation of the back pressure vs flow characteristics for a certain dia hole for an incompressable fluid? I need to get 1 gallon of water per min thru a series of holes (a sprinkler head basicly). I have the number of holes, how do I calculate the proper dia. I...

I would like to talk to someone with indepth belt drive design experience. I am working on a 50hp 3600RPM drive design using Gates GT2 Polychain cog belt for a OEM application. One of the problems of the design that conserns me is alignment. Have you ever had to realign a machine after...

Hi safecracker, I read your thread about chain to belt drive conversion. I am designing a fan drive with Gates Polychain. We are an OEM supplier to the frieght locomotive business and have never used this technology before. We are not sure how long they will last in our invironment, how many...

Thanks for the advise.

Thanks for your note. You mentioned alignment issues. It just so happens that alignment is one of our big concerns. Maybe I could ask a couple more questions? What is a Gilmor drive? How bad were your alignment problems and what did you do about them? Our design will be 37mm wide (about...

I would like to talk to someone with indepth belt drive design experience. I am working on a 50hp drive design using Gates GT2 Polychain cog belt. One of the problems of the design that Gates Engineering has not been able to address adequately is the effect of thermal expansion on belt...