Recent content by paulratledge

I still dont think I can press any "buttons" so to speak. Finally got actual picture of inside of my object and found out that the ID of hollow portion is 6" ID and the section is 56.5" long. I finally got a weight of 925.66lbs using .285 as my density. Those dimensions change the size quite a bit.

Does the rotor picture affect the calculations?

I am having a hard time getting the buttons to work or I am doing it wrong. If you could throw me a couple tips or do I need to buy another version of excel. I have office pro now. Thanks

Here is the first two tabs changed a bit. let me know what you thinkhttp://files.engineering.com/getfile.aspx?folder=f9b6ce65-39e8-4cee-8e0c-938955844058&file=PaulRatl1.52.xls

I noticed on the rotor section tab that you divide the inches by 39.97 is this an error or should it be 39.3700787?

I found a couple places where the id and the od in your charts isnt as exact as I want it. Should I be changing values in rotor section tab and or rotor picture? Id also like to play with the density a bit. Thanks

Hey electric.On the first excel you posted.. How can I change the calculations using a bearing coefficient of 1.52?

wow, you did a lot of work. thank you a lot. i feel like i should be buying you dinner or something. thanks again. i am going to need to read over this a few times

The smaller diameter pieces are inserted 6 inches into each side. that is why the 64" piece only have 52" hollow. i cant really discuss the 64" piece in great detail only know that it is machined stainless and 4140. treat everything as 4140 for density. thanks a million I love this site.

Sorry.. how about 1mil at 3000rpm

I balance the rotors on a case by case basis and as such do not have a standardized unbalance. I have thought about putting a mic close to the rotor and just measuring the deflection per piece also. What about criticals?

The bearings are ballbearing style. I would put the ends someplace on the 9" sections. The rotor is allowed to move a little laterally with floating bearings. The bearings in the frame sit 76" apart. the rotor is longer than 76 total inches but it floats a few tenths to allow for thermal...

I would really love an equation to figure out the deflection of a rotating shaft. The shaft is 76" from bearing to bearing. 9" at 2.950" diameter 64" at 9.685" d 9.5" at 2.95" d the 64"section is a hollow shaft and has about 52" at 3"d missing from middle. density of material is .28lb/in^3...