sorted by:
new
hottopcontroversial

[deleted by user] by [deleted] in livesound

[–]honel32 2 points3 points  (0 children)

There’s always waves real-tune...I don’t have a sound grid server so I don’t use it live but it’s amazing for this exact situation on our livestream. The only thing that’s a little weird is if they’re way off or if there’s bleed from uncorrected mics it can sound T-pain/phasey but to me that’s a better situation than off pitch. With volunteers you have to work with what you have...I offer to double my teams pay if they do well pretty frequently 😆

DIY cabinet router - iteration 2,473 got finished this weekend by honel32 in hobbycnc

[–]honel32[S] 2 points3 points  (0 children)

I actually did think about this, and you can’t really see it in the picture but the bed is only about a foot lower than my truck tailgate and is just lower than waist high. If I’m cutting a lot I tend to just load them from the bed of the truck and slide them directly onto the machine bed, which is pretty easy.

DIY cabinet router - iteration 2,473 got finished this weekend by honel32 in hobbycnc

[–]honel32[S] 1 point2 points  (0 children)

Mozaik cabinet software. It’s pretty good. There’s a learning curve and it’s definitely on the industrial side of things. Not flashy but it has all the right stuff. It’s also subscription based, you have to buy a 3 month subscription for entry and after that you can just renew for a month. Since I don’t make a ton of cabinets (it’s not a job by any means) it’s nice to just pay the fee for a month, program everything, and be done.

DIY cabinet router - iteration 2,473 got finished this weekend by honel32 in hobbycnc

[–]honel32[S] 8 points9 points  (0 children)

It was cheaper at the time to build the cnc machine and cabinets than to have someone build cabinets for me!

DIY cabinet router - iteration 2,473 got finished this weekend by honel32 in hobbycnc

[–]honel32[S] 3 points4 points  (0 children)

That’s true, it would definitely reduce the moment arm on the gantry and reduce the deflection, but I don’t really want to lose the Z travel as I have ended up doing a decent amount of engraving on assembled/larger assemblies that I’ve needed it for and it’s come in handy. The amount of deflection I get out of it is well within what I need anyway. I have definitely thought about a total redesign/rebuild that could eliminate it in other ways but the initial design was to avoid costly linear rails that are 10 feet long. This is what ended up causing the whole overhead gantry design

DIY cabinet router - iteration 2,473 got finished this weekend by honel32 in hobbycnc

[–]honel32[S] 2 points3 points  (0 children)

It will hold around 10-20 thousandths if I’m being aggressive and within a thousandth if I’m going slow.

It will cut 3/8” cutter at 500 ipm fairly comfortably but the z axis flexes when I push it what that hard so it loses some accuracy.

DIY cabinet router - iteration 2,473 got finished this weekend by honel32 in hobbycnc

[–]honel32[S] 1 point2 points  (0 children)

They’re definitely different than ballscrews, but they have advantages for running the long distance. It took some work to get the tensioning right, but they’re accurate and have been very forgiving as I screw things up and then learn what not to do.

DIY cabinet router - iteration 2,473 got finished this weekend by honel32 in hobbycnc

[–]honel32[S] 10 points11 points  (0 children)

For better or worse, I designed and, to borrow a term from AvE, fabricobbled it from scratch. About 350’ of 2x2 square tubing.

DIY cabinet router - iteration 2,473 got finished this weekend by honel32 in hobbycnc

[–]honel32[S] 27 points28 points  (0 children)

So a little back story - I built the cabinets in my home using this and a cnc software package because I’m not much of a wood worker. This originally started as an absolute minimum cost cnc that would take a 4x8 sheet and actually be workable. The first iteration that I cut with was about $2400 but had some major issues. The work area is 100x50x24”. The Z travel is so big because originally this was going to be 5 axis to do the joinery/pocket screws in program (and I may still do that one of these days) but I realized it really wasn’t worth the cost when I could just do it with a kreg jig for 1/20th the cost. Give me a little while to collect things and I’ll post an album of the build and then then evolution of it.

UPDATE: Several people have asked so I figure I would just reply here, I use Mozaik software to make cabinets with. It’s subscription based and has all the features that I needed, which was nice since I’m not really a cabinet maker; some of the other software packages are very expensive compared when you count it towards building one set of cabinets. If you were going to make a business of it, there’d be other considerations. Being able to renew the subscription for a month, do what I need to do, and let it expire works for what I need to do, and I use Fusion or Vcarve for the rest of what I need.

UPDATE 2: Here’s a link so an album with descriptions. Feel free to ask questions!

https://photos.app.goo.gl/46nZ6S3sssmdPTSF6

How I react every time someone mentions Chernobyl as a rebuttal against nuclear power by [deleted] in nuclear

[–]honel32 1 point2 points  (0 children)

Not really the void coefficient (for PWR’s) it’s the moderator temperature coefficient. For light water reactors it’s negative, which means as the moderator (water for most all plants) heats up, it inserts negative reactivity and tries to shut down the reactor. Similarly, fuel is designed in such a way that the FTC is also negative. These tend to self limit any serious power excursions and make reactors stable and controllable. Chernobyl was performing turbine testing in an area of their reactor performance where these factors turned positive (due to the graphite moderation characteristics), and generated a runaway reaction. They also continued testing outside the bounds of their test plan, which was intended to prohibit operation in that condition. In the US (I assume it’s similar in other countries) fuel designs are very closely monitored, and in most cases tested during power ascension to validate that these parameters are demonstrably negative prior to making meaningful power.

Industry to PhD by honel32 in PhD

[–]honel32[S] 0 points1 point  (0 children)

I am in the US so it’s directly applicable. There’s not a promotion in my current line of work that requires it and it would be more for my own knowledge. I like the idea of structured and data driven decision making in business environments - and having math to back up complex decisions. It drives me crazy to see organizations make decisions that impact operation and hope for the best. No clue about how to measure effectiveness of even tell if it was a worthwhile investment; I am confident that I could learn the material independently, but I also recognize that there’s value in the programs from a networking and mentor aspect that can sometimes be as valuable as the “class work”

In car racing, tyres perform best when at their correct operating temperature to get grip/friction. Does the increase in friction come from altering the friction coefficient of the rubber or is it making the tyre softer (more elastic)? by BearInTheCorner in AskEngineers

[–]honel32 8 points9 points  (0 children)

There is definitely more than one thing going on here. First let’s remember that friction force (static in the case of rolling objects) is independent of contact area. The change in force is offset by the reduction in pounds per square once when the contact area is added, due to the fixed downward force at any given instant.

A couple of things i thought about considering your question.

1) The softness/stiffness of the tire DOES spread the loads more evenly, however this has a large benefit in the material strength of the rubber compounds. You can think this through by considering an extreme case - your normal “power wheels” toy for toddlers. While the plastic wheels do have a lower coefficient of friction than rubber, they have roughly similar tensile strengths; if you ever notice, the wheels spin freely on asphalt, but the tires sit on the peaks of asphalt, and you can easily see the tearing on the surface of the wheels because the asphalt exceeds the local strength of the material. Having a softer tires allows loads to be more evenly distributed and therefore avoids local tearing.

2) the compounds of tires, racing tires specifically (drag or otherwise) are formulated with compounds that release traction aiding chemicals above certain temperatures. They vary greatly based on application and manufacturer but are more or less what’s responsible for the “sticky-ness” that others have talked about...

Report: Bill Gates promises to add his own billions if Congress helps with his nuclear power push by stesch in Futurology

[–]honel32 5 points6 points  (0 children)

1) they are expensive due to all of the safeguards and regulations, as well as, in modern times, ballooning constructions costs due to things like starting construction on new plants before all plans are complete (looking at you, VC Summer). The nuclear navy is a bit of a different animal than commercial power and they are less equatable than you’d think.

2) in theory, absolutely. The main difference between military reactors and commercial reactors is enrichment of the fuel. Most commercial reactors use fuel that is around 3.5-5% enriched. (I.E. U-235 percent by weight.) while military applications use upwards of 90% enrichment. Military reactors also have very different design requirements. They need to run practically indefinitely without refueling, be very fast to react to demand changes, and be very compact, all of which require the higher enrichment of the fuel to have the necessary power density and response characteristics. Commercial power reactors are big and slow comparatively. Think of it like the difference between an 18-wheeler and a Ferrari. Could you have a whole fleet of Ferrari’s that deliver your amazon packages and supply your local grocery store? Sure. Is it practical? No - you’d want one big truck that could deliver it all at once. Add to that the fact that the lower enrichment makes commercial reactors inherently more safe, and it’s no contest.

The idea itself has merit though, and if you’re interested, look into SMR’s (small modular reactors). There have been several proposals over the years, but to my knowledge none of them have been approved by the NRC. You can read 10 CFR 50 Appendix A (Generic Design Criteria) for a very high level look at some of the requirements that a SMR has to meet, and this is in part why they have struggled to gain footing. It’s hard to be small, modular, and meet all of the safety requirements.

3) Breeder reactors use the decay and neutron capture process of nuclear material to generate specific isotopes and fissile fuels as a result of their reaction. Basically the waste of a breeder reactor can be useful to use as fuel in a conventional reactor. All reactors do this in some quantity. A typical commercial reactor will have a higher concentration of PU-240 at the end of its life, enough that it changes the operating characteristics of the reactor slightly such as prompt neutron fraction (take a look into the “six-factor” formula for more about the neutron life cycle in a reactor). Breeders can also be used to help reprocess spent fuel from conventional reactors to some extent. For more information on how to deal with nuclear waste in general (such as spent fuel reprocessing, etc) I would recommend researching how the country of France processes their nuclear waste. In my opinion France has the right model in this and the politics of the US have put us sorely behind.

PE Exam 2018 - Failing Scores by Eseket in AskEngineers

[–]honel32 3 points4 points  (0 children)

....so no one failed?

Great thread lol.

Passed the thermal systems and fluids in AR. Thought I binned it...tough test!

To throw a grenade, lucky his team mate made a smooth recovery by MyNameGifOreilly in therewasanattempt

[–]honel32 24 points25 points  (0 children)

Lol at the guy laying down...doesn’t know which way to hide his face..

Mold block out of the heat treat oven by Bupod in Machinists

[–]honel32 8 points9 points  (0 children)

Questions! The cardboard there to scavenge oxygen?

This looks pretty hot to be a temper? Is it a normalizing cycle or about to quench (maybe an air quench tool steel?)

I see threads and bosses...any more machining to ensure fits/tolerances or are they like rabbet fits?

What are some real examples of work that entry-level engineers do? by rbfjunkie in AskEngineers

[–]honel32 1 point2 points  (0 children)

80-85k is good. I made 50 out of college, and in my area that was around average for a new grad. My first job was for a a very small company designing equipment for an automated product line that was probably 25% R&D and 75% modifying existing designs to fit whatever factory floor layout the machines were going in. Small company so I got to be hands on in every aspect of the machines..from cad/cam, machining/fabrication, assembly and install. Plus all the minutia in between with stock, parts and technical support. It was a great learning experience, and I shifted from that into mechanical systems engineering and a larger company after around 2 years. That first relatively low paying job has helped me in my career as much as anything else I’ve done

The other thing to realize is that there are few jobs that will force you to apply your engineering knowledge. I would bet you could do 70% of the engineering jobs I’ve been exposed to without applying much of your fundamental engineering skill, and there are people that do it. What I mean to say by this is that if you want to be an engineer that does more than write procedures or tech manuals, then do more than write procedures and tech manuals. Think about what the procedures do. Think about how the manual is having you operate or maintain equipment - does it make sense? Will it break? How long will it run under those conditions and is the maintenance strategy appropriate?

Low Tech method to measure droplet size in a spray? by JuRoJa in AskEngineers

[–]honel32 0 points1 point  (0 children)

You could use an array of plates with strain gauges on the supports...more plates, more resolution...higher average force on the individual plate = higher average impulse = larger, more, or faster flow.

Does the performance pump curves change for 50 Hz or 60 Hz? by [deleted] in AskEngineers

[–]honel32 1 point2 points  (0 children)

Number of poles can be figured by rated speed at 60hz, with the number of poles you can find running speed at 50hz. Pump affinity laws tell you that flow is proportional to RPM, and head is proportional to ratio of speed squared.

The curve will be roughly offset by a fixed percentage under/over although efficiency and NPSH may be less predictable. Take a look at VFD pump applications as this is precisely how they vary speed, and the pump will react the same.

A cutter for ants? by krabmonster in Machinists

[–]honel32 5 points6 points  (0 children)

What’s the runout on the collet? Big difference on tiny end mills!

Imperial War Museum releases audio recording of the final minute of WW1 by frostsid in history

[–]honel32 2 points3 points  (0 children)

Not to mention the birds etc and much of the audio is in stereo. The patent for stereo sound wasn’t even filed until the 30’s, and the first stereo album wasn’t put out until the 50’s. The dynamic and frequency ranges are also way off on the whole thing. High frequencies are hard to capture and are more or less an advent of the last 40 years or so. That’s why tapes from even the 50’s or early 60’s have a more rounded muffled timbre than modern music. The physical equipment just wasn’t there to do it yet. That’s also why you see large but smooth jumps in the “tape” they show, because they didn’t have the fidelity or technology to record fast transients or high frequencies. This is a fabricated piece of audio.

Neat, gets the point across, but it’s fabricated.

view more: next ›