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I put this up in the gear forum but it didnt get much response, maybe here is better. Does anyone have the link to a web calculator (or text reference with formulas as a second option) that calculates pulley belt drive frequencies based on each pulley dia, teeth #, and belt length? thanks.

Does anyone have the link to a web calculator (or text reference with formulas as a second option) that calculates pulley belt frequencies based on each pulley dia, teeth #, and belt length? thanks.

.00005"- thats why im worried about the hole walking when i heat it up.

the hole was rough bored to near diameter than fined bored to spec- no processing or heat treating was performed.

I have a block of low carbon steel with a 3.543 (90mm) bore located to within half a tenth. Does anyone know of or have a source/rule of thumb that would allow me to find a maximum tempurature i could heat the block up to before I have to start worrying about the relaxation/release of internal...

israelkk, that is probably what he ment- unfortunatelly the housing has already been machined- any suggestions as to a safe maximum temp i can get up to before removing these internal stresses?

sorry- i left out tons of info. bearing OD is 3.543"(90mm), being pressed ~2" deep into a carbon steel housing bore ID 3.543" +0/-0.0003. The bearings can be cooled to ~32 deg F but not much lower. To clairify, I have two bearing housings, line bored to ensure as close to prefect...

I have been told that heating the bearing housing to make the pressing my precision bearing easier could change the structure of the metal and slightly change the allignment of my bore. Any comments on this- i would be heating the housing up to around 150-200 deg F. I could see this being an...

Im trying select a low viscosity lubricant for an experiment im running. Considering spindle oil (ISO 10 or 15) at the moment. Does anyone have a good source or reference for material specs/properties for this. I need to find out if this is a newtonian fluid or not and what effects anti...

Anyone have a reference for a good lubraction handbook. I am interested in tables/charts of the viscosities and densities of various lubricants. Specifically I am looking for a low viscosity newtonian oil. SAE 10W is too thick (cant find info on 5W). Are there any other options other than...

what sort of processes would i need to obtain a '12' surface finish on a 4340 steel shaft- can this be obtained just through grinding?

unfortunately this is all in the design phase so far so no real world testing is possible yet. Question though, in your 'bump test' why would you bump the shaft horizontally- it seems that the direction of interest would be the vertical, longitudinal modes of the supports (yes the...

the concept for the rig is a pretty standard 'floating' bearing design. I will be using Two 2"x7:x15" bearing pillars to support the rotation shaft. One pillar will clamp the bearings axially the other will be floating. the pillars will bolted to a 1" thick positioning plate which will then...

Pete, i found a copy of Feildings Books- is that were you got the methods for your mode/critical speed program?

the sad thing is neither am I, ive been struggling through all this bearing stuff, hopefully ill get it right and actually get to taking some measurements. Your correct-- whirl is loss of load capacity when an external load oscillates at .47 times the rotating frequency. Whip is fluid film...

rob, no there are no rotors or disks but as this shaft is going to be used for a fluid bearing test rig i will be concerned with oil whip/whirl at 1/2 the critical speed. greg, no physical tests yet as i am still in the design stages of all this. ((what i am trying to go is find a maximum...

If you dont mind, could you elaborate on why you think a pinned uniform shaft would be a good approx. My practical experience with shafts and critical speeds is almost zero but I was thinking that it seems a 40mm(~1.5") wide double row bearing would be signifigently large in rigidly clamping a...

elecpete- what is the title of leslie's book you are referencing? greg, im coming clean- the dim i gave were just hypothetical because i was too lazy to look at the drawings. The actual specs are: 4" dia x 9.5" section centered between 50mm (give or take due to bearing stops on shaft)...

thanks everyone for the help. I failed to mention that the shaft is 2" for the majority of the length and only drops down to 1" at the bearings so Im worried a concentrated mass might be too rough an estimate (but a good idea-ill probably use that to check the reasonableness of my answer...

I am trying to calculate(estimate) the critical shaft speed of a rotating shaft. When i did this back in school we solved for the eiganvalues of the 4th order diff equation: d^4(y)/dx^4 - B^4*y=0 where B^4=rho*A/(E*I)*omega however this assumes A (shaft area) to be constant. The shaft i...