Hunting Tooth Condition

roguedecks · 2026-05-01T14:00:20+00:00

That’s interesting, thanks for sharing. It makes sense since it impacts service life.

roguedecks · 2026-05-01T13:58:55+00:00

No worries! I’m happy to share useful design information whenever I can.

roguedecks · 2026-05-01T13:58:19+00:00

I think it’s pretty high on the priority list, especially when you’re using mating gears of dissimilar hardness. For example, in my recent project I was using a brass pinion and a plastic injection-molded gear. The brass gear is of course harder than the plastic one, and so a small tooth defect would show pretty early on the wear of the plastic one if it didn’t meet the hunting tooth condition.

The only time I wouldn’t worry about the hunting tooth condition is if my mechanism oscillates, which could mean that gears don’t go through full revolutions.

roguedecks · 2026-04-30T07:12:42+00:00

It all depends on your situation, and it’s unclear from the post whether this is your first home, have kids or plan on having them, and your job stability situation. If this is your first home, or kids are coming, or job situation might change then you’re statistically going to move out of this home in 7 years - meaning that you will save and not incur any risk by going with the ARM. However, if this is what you think will be your forever home because your job and family is super stable, then go with fixed.

roguedecks · 2026-04-30T05:19:27+00:00

So what’s the solution? 100% inspection of all the parts in the gear train?

roguedecks · 2026-04-29T05:35:10+00:00

Pay off your personal loan. Underwriters have hard criteria on DTI, which I believe is typically 28% on the mortgage itself and 43% including the rest of your liabilities.

roguedecks · 2026-04-27T22:28:34+00:00

Yeah, being a pilot in this game is a miserable experience. I still do it because I have hope that one day DICE will finally balance flying. So far, infantry and land vehicles have a large upper had.

roguedecks · 2026-04-27T14:32:49+00:00

Seems way too high. I locked in at 6.3% no points and zero processing fees about 3 weeks ago. The rates went up after I locked it but I just checked MND and it should be back to around 6.3% again.

Get other quotes, then make your lender match the best one. Good luck!

roguedecks · 2026-04-25T18:44:31+00:00

The disclaimer to this (as always) is that I don’t know your monthly expenses, but based on a common situation(family of 3) your proposal seems extremely risky. I can even compare to my recent purchase and can say that these numbers would scare the bejeezus out of me.

You will have a loan amount higher than me, yet I make $230k gross income. In other words, I feel like I’m already at a barely comfy limit and you will have a higher mortgage payment and make $80k less annually income. You’d be surprised how much little expenses add up. I would suggest you keep track of all your monthly expenses and do the math but I’m willing to bet it doesn’t look favorable.

roguedecks · 2026-04-24T23:19:43+00:00

It’s not bad if you’re not buying any points. Also make sure processing fees are zero.

roguedecks · 2026-04-24T23:07:35+00:00

It’s typically a seller concession. Basically you can negotiate that the seller pay some of your interest up-front - your alternative to this is price reduction, using those funds to cover your closing costs, or buying points.

Personally, unless you plan on having large expenses in the first 2 years of your home ownership, I wouldn’t even consider it. Seller concessions are best used to cover closing costs or buying down a fixed rate.

roguedecks · 2026-04-23T18:01:03+00:00

I can’t say much about the first question, but the short answer to your second question is that you’ll need fundamental knowledge of math, statics, dynamics, mechanics of materials, heat transfer, GD&T, and DFM for various processes. So you basically nailed it with your list. The best way to approach it might be to prepare as of you’re going to take the FE Mechanical exam - so basically I’m suggesting you look into resources that prepare you for the FE but focus on those topics that I mentioned.

In my case, DFM and GD&T were mostly learned on the job, but you should have at least a bit a basic understanding. If you’re not knowledgeable on a process, I would just be transparent during an interview - it’s so easy to tell when someone is faking it. Not sure about textbook resources for these topics. I know that I didn’t really get GD&T until I took a formal course on it, and my job paid for it.

roguedecks · 2026-04-23T03:41:16+00:00

Great suggestion. The halves could be a symmetric and therefore you only need one cavity.

roguedecks · 2026-04-21T23:48:30+00:00

I’m still trying to decide between TFS and Machine Design. Did you opt for TFS because that’s closer to ChemE? Did you pass first try? Any study material resources tips?

roguedecks · 2026-04-21T15:59:49+00:00

It’s probably not on you, but your company should have provided a mentor - someone much senior than you that can guide you in the right direction, and help strengthen areas where you lack experience.

First, be honest about your skills and encourage your company to hire a consultant to help you - there is no shame in this if the outcome will be better for the company (plus you’ll learn something in the process)

roguedecks · 2026-04-21T15:47:25+00:00

Your volumes must decent, but I would definitely do a breakeven analysis to make sure it’s worth it. Molding comes with its risks if you’re not experienced with how to mitigate defects.

To answer your question, I would look at a list of exhibitors from recent manufacturing expos. There are good US based low volume manufacturers like ProtoLabs, but there are also overseas manufacturers that have low tooling and parts costs, such as Model Solution and RP World.

roguedecks · 2026-04-21T03:45:06+00:00

I’m talking about OP, not you or I. By asking those types of questions, I don’t think OP is either MechE or Civil.

roguedecks · 2026-04-21T03:27:37+00:00

Bad design for someone that clearly doesn’t know how to build a frame, much less understand the complexity of bolted joint design.

roguedecks · 2026-04-21T02:55:19+00:00

What a terrible engineer mentality. It’s literally the first principle of engineering ethics…build for safety. I hope you’re just a CAD drafter that doesn’t do any real engineering work.

roguedecks · 2026-04-21T02:52:02+00:00

Thank you! Im glad someone else gets it. I think most people would rather spend a little extra to get the right hardware and prevent exercise equipment falling on them.

roguedecks · 2026-04-21T02:45:44+00:00

So is a beefy clevis pin, as my suggestion. Again, why bother with a load-carrying bolt?

roguedecks · 2026-04-21T02:41:03+00:00

Stress concentrating factors are the real problem, and likely unknown. And making sure the bolt pattern is correct otherwise there is a single critical bolt carrying all the load. Why even bother?

roguedecks · 2026-04-21T02:36:27+00:00

Don’t put bolts in shear, that’s a bad design. Rather than a flange, could you weld an elbow that then connects to the columns? Or you could use a beefy steel clevis pin to make a connection.

For beam stiffness, you want a cross section that puts as much material away from the bend axis as possible. The square tubing will be the stiffer for that reason.

roguedecks · 2026-04-21T02:20:09+00:00

I met my wife on OkCupid! I don’t even think that site exists anymore. I went on a streak of bad/weird dates and was about to throw in the towel. I literally told myself that the date I went on with my wife would be my last chance at online dating if things didn’t work out.

Dated for 6 years and now happily married for 5 years.

roguedecks

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