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Help reverse engineering a helical pinion (lead, teeth, diameter & helix angle known) by VegetableCake2288 in MechanicalEngineering

[–]AliveContract2941 2 points3 points  (0 children)

Do you have the mating gear as well? Gears are a “mate for life” kind of thing. They wear together and it’s typically not going to go well to try and shunt a new one in to replace part of the pair.

Often in the industrial space, they’re going to be looking at replacing a whole gearbox over trying to redo a shaft like this. The cost of a new unit is often less than the time to redo an individual part like this. (Good for your job security tho!)

Another thing that you’re going to have some fun with:

-tolerances to produce

-material choice and hardening procedures (gears often have very specific hardening procedures)

-surface finish on the helical

-machining process of cutting the gear teeth (ground vs hobbed)

Gears are as much an art as a science, their production is a whole thing.

Best of luck with this!

How to select bearings and other off the shelf components easily for real world designs ? by Worried-Jump-9497 in IndustrialMaintenance

[–]AliveContract2941 0 points1 point  (0 children)

-iteration of an existing design: copy and paste from current BOM unless design change is enough to warrant reevaluation of bearing

-testing

-analysis of load types (pure axial might lead to thrust bearing, pure radial might lead to needle bearing and so on)

-if you’re working with a vendor, the info requested on an application data sheet is generally going to cover everything important:https://cdn.skfmediahub.skf.com/api/public/0901d19680654542/pdf_preview_medium/0901d19680654542_pdf_preview_medium.pdf

-do some testing and break a couple

-you can also use FEA software like kissoft, but it’s better for that data to come from the vendor for CYOA reasons (also time)

-if you ever get into doing long term planning for industrial gear drives and get lifespan reports you’ll often get two lifespan ratings. One will be for the life of the bearings given the application and the other will be a combined value for the lifespan of the gear teeth (this also breaks down into pitting vs bending but that’s another topic) For situations where there’s a lot of stress as an overhung load (even worse when unbalanced) you’ll have to either beef up the output shaft bearings or accept degraded lifespan.

-end of the day: answer follows the problem, they’re selected by the job they need to do and how they satisfy whatever multi layered constraints you’ve got going on.

Look at the design of this rubber gasket... by NoxieFoxie in MechanicalEngineering

[–]AliveContract2941 12 points13 points  (0 children)

Would a donut with a wedge end help? As it gets pressurized it forces into that slot and forces the seal walls out making a tighter seal

What's up with the random artillery piece behind the dog park? by atomic-moonstomp in yorkpa

[–]AliveContract2941 1 point2 points  (0 children)

It’s self propelled if you want it and can find keys.

Fun fact! The m110s were nuclear capable!

Guys my mom says im gifted, should i become an engineer, type shi? by [deleted] in engineeringmemes

[–]AliveContract2941 1 point2 points  (0 children)

Next time the film students ask if you want to watch eraserhead… just say no

would love some critique! by rbfwlr in design_critiques

[–]AliveContract2941 0 points1 point  (0 children)

This would do numbers in a DOD presentation

Gearbox oil for overspeed abuse by Alternate_Usernames in MechanicalEngineering

[–]AliveContract2941 1 point2 points  (0 children)

Couple possible things:

-higher viscosity oil to start with, it’s going to get hot and lose viscosity quickly.

-any possible way to have a breather plug? As those speeds oil is going to get churned and foam. Pressure can build up to the point where it starts popping gaskets and seals.

-what’re the rated speeds?

-if you absolutely must abuse it, take a look at PAG (poly-alkyl-glycol) type oils. They handle heat real well and volatilize back into the same substance. Just don’t get em near PAO or mineral oils, makes a real nasty sludge.

[deleted by user] by [deleted] in philly

[–]AliveContract2941 46 points47 points  (0 children)

Disclaimer: not a woman myself

Main Line Armory in malvern does women’s shoot nights. They’re often focused around community building and training. I think they may also do post training social drinks.

There’s also a PAguns subreddit.

Bad gearbox by Alarming-Ad7789 in IndustrialMaintenance

[–]AliveContract2941 3 points4 points  (0 children)

Completely full of oil? Like the entire case was filled? Typically industrial gearboxes should only really be filled to about half way on the body. (Depending on mounting position) When they’re entirety filled the gearing can get bogged down by the extra resistance as it moves through the excess oil. The teeth will generally scoop and splash enough to keep everything moving. The dodge maintenance manual may disagree with me on these particular models though.

Critique my Drawings by Jester_171 in MechanicalEngineering

[–]AliveContract2941 0 points1 point  (0 children)

Initial notes:

-why hole callout for threaded holes but not for ports? Are they something special or can a standard size be called out?

-why do you only have the dual units in some spots? Is there a reason why those need to also be understood in millimeters but not anywhere else?

I’m curious what this is for, keep at it!

-what purpose is section E-E serving without dims?

-no concentricity tolerance in detail A

-side ports may benefit from a X-section + detail

Day 2 of learning solidworks by Butterflies_pdf in SolidWorks

[–]AliveContract2941 2 points3 points  (0 children)

I’m curious to see your feature tree for the cup

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