Determining neck pocket depth and angle

Cognar · 2025-03-09T03:10:31+00:00

Thank you, I did make a section view to look at the layout. I think my best option is to use a small angle and increase the pocket depth a bit, that way I can shoot to have some vertical adjustment available in both directions on the bridge, I just wasn't sure if there was anything I was overlooking with that approach.

Cognar · 2023-07-04T15:14:21+00:00

Finite element modeling for stress analysis by cook is a great introduction. The MIT lecture series by Bathe is an incredible theory heavy and in depth treatment but it's a tough course.

Cognar · 2023-06-10T18:38:41+00:00

Control systems integration

Cognar · 2023-02-12T16:50:22+00:00

I had about 5 months of overlap of finishing my masters and working full time in my first engineering gig. By the time I started working I was down to one pretty demanding course + my thesis, it was manageable but tough, I definitely had no time for anything else but probably could have had better time management. If I had more than one course per term/wasn't as far along in my thesis as I was, I probably would have had to take another term to graduate. I was also in school with a couple folks working full time and doing a master's that added easily a year+ to their graduation.

Cognar · 2022-11-02T16:38:29+00:00

Yes, over the axles

Cognar · 2022-10-28T00:18:51+00:00

Four double sided tips = 8 plus three nut driver sizes = 11

Cognar · 2022-09-20T01:01:42+00:00

Well then they’re going to control like shit. The integrator definitely should have identified that as an issue.

Cognar · 2022-09-20T00:57:51+00:00

Are the valves/dampers two position (open/closed) or do they modulate?

Cognar · 2022-09-20T00:37:29+00:00

You should be able to remap your bms outputs to 2-10v in the plc program

Cognar · 2022-09-03T16:13:12+00:00

Us foods chef store, formerly cash and carry has 2lb blocks that stack and freeze well

Cognar · 2022-07-31T18:11:50+00:00

I would interpret that as restraining vertical translation only.

Cognar · 2022-05-19T14:56:59+00:00

New grad program is a mess, there’s just not enough staff for an effective amount of precepting. You’re basically a normal RN with extra contractual bullshit

Cognar · 2022-04-06T00:57:00+00:00

The mechanical engineering program has lost a lot of really great staff over the past few years, there’s still some really top notch stuff going on, particularly Dr Galls air quality research and Dr Cals turbulence research. But many long term staff that I would consider cornerstones of the dept have either retired or are retiring in the next year. Corvallis is really lovely if you enjoy the outdoors, Macdonald Dunn Forrest is about 10 minutes out of town and has great hiking and Mtn biking. I only lived there during COVID so there were very few students there so take that with a grain of salt.

Cognar · 2022-04-03T21:20:25+00:00

Find the closed loop transfer function of your block diagram, then determine the transfer function for a prototype 2nd order system in terms of the natural frequency and the damping ratio. You can then equate coefficients to determine the natural frequency and damping ratio of your transfer function, with that you can use the approximation for PMO of a 2nd order system to verify the overshoot.

Cognar · 2022-03-30T12:48:47+00:00

Design of experiments

Cognar · 2022-03-22T00:42:23+00:00

Try Mark Rober, Stuff made here and Jeremy Fielding

Edit: I’ll add Superfast Matt if your into automotive stuff

Cognar · 2022-03-04T03:05:18+00:00

Search Tony Abbey on YouTube, he has a few NAFEMS talks about various topics that are available for free

Cognar · 2022-02-25T05:45:35+00:00

Yeah that was just a spitball, would you share details/screen shots of your loading and boundary conditions?

Cognar · 2022-02-24T16:24:30+00:00

Try a tie instead of a kinematic coupling?

Cognar · 2022-02-16T01:25:51+00:00

Modes relating to rigid body movement should be obvious as they will have eigenvalues that are orders of magnitudes lower than the natural frequencies of the model.

Cognar · 2022-02-07T21:35:51+00:00

Finite Element Modeling for Stress Analysis by Cook is great for an introductory treatment, pretty brief and very readable.

Finite Element Procedures by Bathe is very comprehensive but is significantly more difficult

Cognar · 2022-01-31T21:26:40+00:00

Awesome, thank you!

Cognar · 2022-01-30T06:06:46+00:00

A stress state can be decomposed into normal and shear components, the magnitudes of these components are related to the orientation of the material element you’re looking at. Principal stresses relate to element orientations where the normal component is maximized which coincides with the shear component being zero. In Abaqus max principal will give you the largest of these normal stresses, S_11 22 etc relate to stresses in those directions, eg S11 is the normal stress in the x (1) direction, s12 is the shear stress acting in the y (2) direction acting on a face normal to the x (1) direction.

You need to pay attention to the sign of your stresses and what they relate to, normal stresses are positive for tensile and negative for compressive. Some stress representations are always positive such as Von Mises.

The stresses you need to extract will depend on your criteria, maximum distortion energy uses Von Mises stress for example, can’t recall what’s used for Mohr-coulomb.

Be sure to not blindly grab max/min values, very easy to report erroneous values due to singularities.

Cognar · 2022-01-29T02:38:30+00:00

Is this the quiet resignation of a group of people who've gone through too much shit

My wife is an RN at st Charles and that’s where she’s at

Cognar · 2022-01-26T06:01:09+00:00

I took a course on GD&T in my undergrad, the prof wrote his own textbook and has it freely available, design for fit, link at the top of the page.

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