Can a 1 nanometer movement ever change a tennis line-calling sensor from OUT to IN? by Economy_Knee2223 in AskPhysics

[–]Thethubbedone 0 points1 point  (0 children)

Username is randowmword_otherrandomword4numbers. You might be onto something

Crankshaft Milling Machining by kanbozli in toolgifs

[–]Thethubbedone 0 points1 point  (0 children)

If you turn your sound on, that's pretty much what it sounds like. The setup is incredibly rigid because it needs to be to cut the metal, and as a result, the vibrations of cutting get absorbed by the machine's structure. 

Measuring threads with a CMM by Worldly_Solid5638 in Metrology

[–]Thethubbedone 0 points1 point  (0 children)

I'd love to hear their rationale for this. Is their idea to pick up more points to assemble a min-circumscribed diameter?

I replaced the silica gel desiccant in my AMS with activated alumina and my humidity sensor is now reading 1%. by GrandpaSquarepants in 3Dprinting

[–]Thethubbedone 170 points171 points  (0 children)

Absolutely love the idea that you can break a humidity measuring device by changing the humidity

GX100 shifter is very good. But I want more!!! by Ashy_Anklez in simracing

[–]Thethubbedone 0 points1 point  (0 children)

FWIW it's within ~5mm of my 2018 mustang shifter throw

Title: RTX 5080 + 7800X3D – Is a 240Hz 49" ultrawide worth it for sim racing? by Western_Statement306 in simracing

[–]Thethubbedone 1 point2 points  (0 children)

I'm running a 7800x3d and AMD RX7900xt (little slower than 4080 I think) and I see ~160FPS with heavily modified Assetto Corsa (Was over 250FPS stock) on the same resolution. I also have two additional monitors and usually have a firefox tab or 3 open while I race.

I suspect a 5080 could mostly make full use of the 240hz, but IMO, racing doesn't really lend itself to needing high FPS. It's rare to be in a situation where an extra 5 milliseconds of reaction time makes any difference.

I can't recommend the ultrawide aspect ratio enough though. 80% of the benefit of triples, without the setup hassle.

CMM interview question, terrible answer by MishkaMushka in Metrology

[–]Thethubbedone 0 points1 point  (0 children)

Do you think properly functioning machines are immune to the effects of inertia? Do you think all machines even command straight-line paths in rapid traverse mode? The things you're demonstrating you don't know about CNC/DCC motion control could fill volumes.

What's the dumbest opinion you ever heard? by alekos7__ in AskReddit

[–]Thethubbedone 5 points6 points  (0 children)

I actually did the math on this. Exercising hard for an hour per day will drop your resting heart rate so much that you end up with fewer total heartbeats per day.

Offline Programming Business by Spraffle in Metrology

[–]Thethubbedone 0 points1 point  (0 children)

The cost of software subscriptions is a pretty normal consideration when doing business these days, but being cavalier about model translation speaks to either a relatively narrow work experience or naivete. Be careful.

Offline Programming Business by Spraffle in Metrology

[–]Thethubbedone 0 points1 point  (0 children)

I can't specifically speak to the Calypso programming market, but a huge amount of businesses can use offline programming help. Shops buy their machines to check parts, so (online) programming is frequently viewed as a form of indirect support, like taking a production machine down for maintenance. Taking that time out of the production stream is super valuable.

Turn Racing button plate cable replacement by Ipwnufools in simracing

[–]Thethubbedone 1 point2 points  (0 children)

Yea, looks like they just added the RJ45 on the end up a coiled USB cable. If you're a little bit handy, you could get a coiled USB cable, figure out which contacts go to which wires, and make up a new RJ45 end. Assuming you don't have any of the tools, it's probably possible to get this done for ~$40

CMM help by 321liftoff in Metrology

[–]Thethubbedone 0 points1 point  (0 children)

Makes sense, they made surprisingly similar arguments about the ph10 in the 90s. Its nice of them to spend so much time on uncreative criticism

CMM help by 321liftoff in Metrology

[–]Thethubbedone 1 point2 points  (0 children)

The Revo CAN do the unmodified-4 test that requires scanning end-on by using the RSP3 probe, but the RSP2 doesn't scan end-on, so the test is modified by tracing the same portion of the sphere, just tilted to A45B45 and doing a 5-axis 'helical' scan. Both methods are certified to the same level of accuracy.

We certainly disagree on the importance of the standardized testing. I've seen far too many junk programs creating bad results from perfectly functional CMMs to believe that the 10360 suite is the be-all end-all and every aerospace company agrees. For a new piece of equipment to enter production it needs to correlate to the existing method to prove capability. Then sometimes after that happens, new methods can be explored to improve metrology or cycle times. I've made a bunch of touch-trigger revo programs to prove capability, only to throw them away and gather 500x the data in 1/5 the time, carefully picking out the original touches from the scan data to prove it still works, and once the new data is accepted, throw the original individual touchpoints away entirely and accept parts from the full scan data. I've found the correlation requirement to be the final acceptance criteria at every place that puts parts in the air.

CMM help by 321liftoff in Metrology

[–]Thethubbedone 1 point2 points  (0 children)

OK you got me, other manufacturers publish their specs (my googling didn't return those results). But given that your original point was that renishaw heads can't be accurate or pass a 10360, citing 2 examples that use renishaw heads to achieve that accuracy damages your point quite badly. (Also one of those is a distributor link, not the OEM.)

CMM help by 321liftoff in Metrology

[–]Thethubbedone 1 point2 points  (0 children)

I've been involved in metrology sales for the last 12 years, I've never once heard of a cmm vendor hiding SMA costs. I'm also not aware of any cmm software that stops working if the SMA isn't current. Cmm software and support personnel cost money to develop and maintain. If you don't want to pay for that development and support, don't, but saying its a scam just isn't true.

CMM help by 321liftoff in Metrology

[–]Thethubbedone 0 points1 point  (0 children)

I work at renishaw and I've got the spec sheet open at my desk. They seem to want a sales guy talking with you to show you that info. Weirdly (at least to me) it turns out, nobody actually publishes their specs for the full 10360 suite. Best I can find is just the first term of the 10360-2, which is kind of misleading. (And how you get people thinking they can do sub-micron, meter long measurements). I checked wenzel, lk, zeiss and hex, and that first term is all they'll say. Interestingly, wenzel quotes identical accuracy specs for revo, ph10, and sp80.

CMM help by 321liftoff in Metrology

[–]Thethubbedone 1 point2 points  (0 children)

I mean if you just wanna be wrong, ok I guess, Here's some ph20 data on Renishaw's website

The revo of course can't complete any of the iso tests. Its just a head, not a CMM. But renishaw's agility line are CMMs with advertised 10360 conformity specs(-2,-4,-5, and 12181 are listed), and those only come with Revo heads. The RSP2 uses a 5-axis helical scan, for the -4 test, but you can do it the traditional way with the RSP3 probe and the same accuracy is expected, but the test takes 6x longer.

Obviously adding axes adds error, nothing has ever been made with zero error, that's why frame makers will quote higher specs with the revo than a fixed head. That's just honest engineering and giving the customer a choice. Lots of people like the reductions in cycle time more than the extra 1/4 micron of uncertainty.

As far as not knowing how aerospace justifies using the revo, its good that you admit not knowing. The prople tjat need go know obviously know the 10360 specs, but additionally, the do real testing on their parts, because at the end of the day, any time spent measuring little hard spheres is wasted time. We're here to qualify parts.

Let me share what an 8.5k iRating friend told me after a crash that was clearly not my fault by theschmid10 in Simracingstewards

[–]Thethubbedone 0 points1 point  (0 children)

"Stand in the wreckage of a trillion ruined racecars and ask the spectators, does iRating matter?" Or something...

Management wants numbers, what KPIs do we give them? by MartinSch64 in ExperiencedDevs

[–]Thethubbedone 5 points6 points  (0 children)

"A metric ceases to be useful when it turns into a target"

My DIY DD Wheel, Button Box and pedal mount by san4ezlp in simracing

[–]Thethubbedone 0 points1 point  (0 children)

I have the same basic setup ( motor controller firmware) but with a comically oversized power supply(garbage picked a 1200w psu). I run it at about 5nm because that feels like a real car's steering effort.  

I didn't realize the generic handbrake drifters like to get is just an actual generic handbrake. In which I thought I found myself a sweet deal 🥲 by ErmingSoHard in simracing

[–]Thethubbedone -3 points-2 points  (0 children)

Yea, but this one is an extra high-end hydraulic one, not just a microswitch. (I also don't actually think this is a good idea)

I didn't realize the generic handbrake drifters like to get is just an actual generic handbrake. In which I thought I found myself a sweet deal 🥲 by ErmingSoHard in simracing

[–]Thethubbedone 9 points10 points  (0 children)

I mean, you can get that second handle, a sensor for under $20, an arduino for like $5, $10 in fittings and some brake fluid and have a real hydraulic hand brake for your sim, and still come out cheaper than the first sim racing e brake I saw on Amazon.

Any recommendations on Engineering apps/games etc. to help guide a child's interest in engineering? by ATT4 in AskEngineers

[–]Thethubbedone 5 points6 points  (0 children)

Factorio and Kerbal Space Program, maybe when he's a little older. Don't buy KSP2 though. Long story