My used torque wrench turned out to have lost significant linearity so I couldn't get it calibrated beyond any single torque value. And that's an SK Tools clicker style wrench with a $330 retail price. Maybe the wrench needs you to explain to it how that's not possible - I'm open to anything here.
Oof, that's a deep subject. First, AGMA, DIN, and ISO does not "approve" any gearboxes that I'm aware of. (It's not like UL.) So in contractual language, a vendor should never offer an AGMA approved or certified gearbox. If they do, question their competence.
On a more practical level...
I just received a used torque wrench from eBay and the (moron) seller had it left at max torque adjustment. And if it was his personal wrench (it had his name written on the case in marker) it likely was left there for a very long time until he was motivated to list and sell it. Tomorrow I'll...
Spherical rollers tend to fail suddenly only in high axial load conditions. In radial load conditions they tend to truck along.
Will they receive regular inspection and relubrication?
Those look like load-bearing bolts. Unless there is an obvious root cause related to operator error, the strength of the repair is going to be crucial and with castings such as this, there may or may not be adequate remaining metal around it to support it.
I would consider if a complete plug...
Static load rating is for non-moving cases only such as emergency / upset conditions. Rolling a bearing anywhere near the static load rating will cause failures in short order.
Service factor has no applicability to rolling bearings, at least since bearing life calculations were developed in...
I think you need to have a few career choices in mind to make your decisions. Something pulled you from math to mechanical engineering, what is it? What do the jobs related to that require? Having a PE or path to PE licensure is never a bad thing, however in many engineering roles it adds no...
A thought I haven't seen mentioned yet: If the shaft in question can be damaged by supporting it in only two of the three bearing locations, then definitely use three. This is possible if the shaft is solid and made of a low- or medium- strength alloy.
I have a component I want to have made domestically for a personal project and I have an existing version that was made overseas. That vendor has vanished just a few months after that.
I believe the existing version was made by hard milling of 440C 55HRC. It's a small split cavity mold used...
Just ask the anchor supplier what their rating is for brick and mortar substrate.
I suspect you won't find any anchor suppliers who will agree to that. Then put a proper foundation down.
Another thought: I would be very careful to prevent bearing races walking. When a housing is stationary the outer races can be slight clearance fit without much risk of them moving around under load, since the internal and external loads tend to be a consistent direction. If the housing is...
B106.1 is a good method when loading is somewhat predictable.
When loads are variable it can get conservative using worst-case loads but for a winch drum I wouldn't get leaner until I was really, really sure how it will hold up.
Really the only way I know how to assess this well is to perform an FEA-based contact analysis and incorporate the allowable assembly misalignment as well as deflections due to operating loads and thermal growth (if any).
If you're in a particular industry I expect the individual design groups...
If your scope is only flanges, then you're going to be working with someone who is responsible for the piping and/for vessel design.
Don't let them sucker you into responsibility to know the material grade that is suitable for *THEIR* application and environment.
Ironically, PMI guns have an internal library that do exactly this. I'm not aware of an off-line version of the same.
Do you have a copy of ASTM standards? Standards like A-240 define a range of material grades and put them all in one table within the document. Assuming you have a rough idea...
In my experience, it's a site maintenance manager who managed to keep a badly designed (or overtly abused) machine in operation longer by welding together some fasteners. Then they apply that requirement to all machinery.
Also in my experience, it's impossible to predict what will happen when...
In my experience offering small machinery, the materials, degree of safety (ATEX rating), and coating/painting requirements are vastly more strict for offshore. Replacing machinery on a platform is understandably disruptive and expensive logistically so it's understandable.
Whether or not...
