I have an old wound rotor hoist motor that I would like to find the breakdown and locked rotor torque for... or at least narrow it down a bit.
It is a "Lancashire Dynamo and Crypto" vintage ~1932, 60 hp, 220V, 900 rpm, 30 min rating. (I've often wondered what the heck a 'crypto' is)
I have...
I recently took some new unlubricated 300-series nuts and bolts, put them together SLOWLY WITH MY FINGERS, and they gauled and seized so tightly that I could not take them apart with a wrench. On the other hand, I've noticed that a hard heat-treatable stainless isn't as bad and I believe can be...
When you say that electrical measurement will not account for losses, what do you mean? Are you talking about internal mechanical (bearing/windage) losses in the motor and/or electrical losses?
If so, the latter can be accounted for. I think mechanical losses probably could be too. If you...
Tmoose/mewhq: thanks for your comments. More about what we're actually doing - it's essentially a like-for-like replacement of existing cast steel wheels, of similar hardness, which have lasted for over 60 years without any indication of fatigue failure (corrosion is another matter). Despite...
The contact stress is about 1.5 GPa. I did manage a life calculation based on data I found for AISI 1030 at 10^8 cycles, and adjusting via log-log relation for the contact stress of interest, but that isn't a very convincing calculation. Had to assume S-N curve slope, question about failure...
Hi Group -
I'm trying to predict rolling fatigue life for cast low carbon steel of about 165 BHN, and at relatively low cycles (~10^5). Most of the work I've found on the subject of rolling fatigue seems to be oriented towards bearing design, with a sprinkling of work on cams and gears, so all...
Hello Group,
My company builds a line of weatherproof enclosures made from pickled & oiled hot-rolled mild steel sheet which we currently coat by solvent wash, 3 mil industrial epoxy, and 3 mil urethane top coat after final assembly.
The enclosures are assembled from pre-manufactured parts...
Thanks for your reply Regg - the cycle through thing seems to work.
Your open table method doesn't seem to work much differently than mine (although a bit sexier).
FYI DTs always open in Solidworks.
Cheers, David.
Hi Group,
I've written a VB6 application which among other things attempts(!) to update some info within design tables - it works sometimes, but the problem is getting the DT to be the active workbook. (there is another WB that must stay open in Excel while the program is running and sometimes...
