How are airliner engines held on?

[@ericfeatherstone]

RC filter is what they're called.

[@RotarySMP]

Thanks. I knew it would be clear to those with experience.

[@kevinvermeer9011]

More specifically, a low-pass RC filter. If the capacitors are in series with the circuit, only high frequency energy can pass and the low frequency is rejected to ground through the resistors. If the capacitors are in parallel with the load, spikey high frequency energy goes through them to ground and only low frequency can go through the resistors to the load. Sometimes an inductor/ferrite/choke (abbreviation "L" for Lenz, a pioneer in the field) is used instead of an ordinary resistor, in that case it's an LC circuit.

[@RotarySMP]

@@kevinvermeer9011 Thanks for that explanation.

[@MikelNaUsaCom]

Yep RC filter is used everywhere... even in digital systems for tuning timing.

[@MikelNaUsaCom]

Merry Christmas!

[@BraxtonHoward]

This is the best cabinet alteration channel on KZbin. Lol

[@RotarySMP]

I will soon need a new machine, as I am running out of boxes to miniturise. :)

[@aleksandarvasilevski7410]

Just to say thank you for that insert for motor mounts. Realy enjoy when someone explains and shows high tecnical things.

[@RotarySMP]

Thanks for the feedback. That helps.

[@johnmccanntruth]

Lots a great stuff this week. Cool trip to Malta, I really liked where you pointed out the stuff in the way. Merry Christmas! 🎄

[@RotarySMP]

Thanks for the feedback. I really helps. Merry Christmas.

[@Ryan-dz3jo]

Merry Christmas and thanks for taking the time to share your progress and stories 👍

[@RotarySMP]

Thanks for your kind feedback. Merry christmas.

[@MRCNC1967]

In my early 20's (very, very last century) I worked for an equipment manufacturer, everything was contactors and relays back then. To give the relays and contactors a fighting chance at getting through the warranty period all the heavily loaded contacts had a "QuenchArc" capacitor-resistor package placed across them to absorb the arcing. They were sized depending on the load the contact would be switching and they worked quite well. I believe they are still available. Also, reverse biased diodes were placed in parallel with all DC relay coils to protect any solid state devices from back EMF induced when coils were de-energized. Merry Christmas and keep the videos coming, can't wait to see that sweet lathe making chips!

[@RotarySMP]

Thanks for the wisdom. The Maho also has reversed biased diodes across all relay coils. Are thry not built into contactors as standard these days? Merry Xmas, will do :)

[@MRCNC1967]

@@RotarySMP The diodes are only used to block back emf on DC coil relays. Some relays have built in indicator LED (wired in parallel with coil) which interestingly work regardless of how the relays are wired (with respect to polarity) into the circuit. I believe the led package has two led chips, in parallel but in opposite directions so one will light regardless of polarity, and then other will absorb the back emf when coil is de-enegized, lighting for a fraction of a second. Generally when I think contactor I think AC coil, but there are DC coil contactors too. Since they are "big" and the coil draws a bit of power, a smaller relay (powered from solid-state device like PLC) is used to switch the larger contactor, with either AC mains or unfiltered (raw) DC power supply. That's the way our machines are set up in the shop and we keep an assortment of standard "ice-cube" relays on hand.

[@RotarySMP]

@@MRCNC1967 The Maho does the same. 24VDC relays to switch the 400V 3Ph contactors.

[@ebrewste]

It's impressive to watch you modify and repurpose things like that RC filter box. I find it relatively easy to make things from scratch or make a hack of an old thing, but modifying and old thing and making is like new is really nice. It keeps the character of the machine nicely.

[@RotarySMP]

Thanks, I appreciate the feedback.

[@hedning003]

blood on the box,and a bloody finger - blood sweat and tears is what holds the world together - Happy holidays to u,Mark

[@RotarySMP]

Thanks a lot. Merry christmas.

[@Sheevlord]

4:20 I think this is an RC snubber filter. They are installed across inductive loads (such as motors and relays) to get rid of voltage spikes when the load is turned off. Sometimes a reverse polarity diode is used instead.

[@RotarySMP]

Thanks for that. So it was spiky voltage :)

[@poprawa]

You cannot reverse protect AC lines, diodes are for DC :v It is possible to get stacks of normal diodes, but as many in series as needed to clamp only voltages much higher than specified line, with two of this stacks you get ultra fast and ultra low ESR waristor but i'm sure that it is for real transients, like arcing and lightning nearby

[@poprawa]

Naming is cool tho Bidirectional transient-voltage-suppression diode

[@RotarySMP]

@@poprawa That sounds like a part for the retroencabulator :)

[@Sheevlord]

@@poprawa Yeah, I should've mentioned that. Diodes are used with DC loads

[@bsmepe]

Merry Christmas! Enjoying the content.

[@RotarySMP]

Thanks for the feedback. Merry christmas.

[@ReubenSchoots]

Oh no! I am caught up with the series and will need to watch in real-time. Brilliant series. So looking forward the next instalment. Cheers and Merry Christmas from down under, Reuben

[@RotarySMP]

Thanks for watching through the series and for the feedback. Merry Xmas, Mark

[@blahblahblahblah2933]

Fun Video. Gotta hand it to you, you really have a passion for making boxes into slightly different-sized boxes.

[@RotarySMP]

Yeah. I am running out of wrong size boxes on this project.

[@GeoffTV2]

Great content as always, thank you. Hope you and Mrs SMP have a great Christmas. - Heather.

[@RotarySMP]

Thanks Heather. Wish you a Merry Christmas as well.

[@TheKnacklersWorkshop]

Hello Mark, This project has made you very good at shrinking cabinets... shrink anything more you'll be back with the mini lathe - lol. I hope you and the family have a very Merry Christmas and Happy New Year, Take care. Paul,,

[@RotarySMP]

Thanks Paul. This shrinking went smoother than I expected.

[@antonwhittle415]

Enjoyable vid and especially that was a great piece on the Aircraft Engine mounts.

[@RotarySMP]

Thanks for the comment Anton. Merry Christmas.

[@neillawson4493]

I would have called your circuit simply a suppressor but it is also a "high pass filter"; that is if there's an inline capacitor and a resistor to ground. And the fancy inductor will be the opposite: a "low pass filter" to remove all of the high frequency noise or "hash" . Thank you for the great series, Happy Christmas.

[@RotarySMP]

Thnks Neil. Merry xmas. Mark

[@Alexander470815]

The line reactor is for the input side of the VFD to improve its powerfactor. For the output you will need a LC-filter also called Sinusfilter or dU dT filter. A reactor alone will do almost nothing to flatten out the PWM voltage spikes of the VFD.

[@RotarySMP]

That is not good news. I was informed that it would work on the output as well. Darn.

[@swatcat7928]

A transformer will not work with a frequency of 10hz or 100hz.

[@RotarySMP]

@@swatcat7928 Hmm. I was given this advice on the LinuxCNC forum.

[@swatcat7928]

Ca you share more detail about that reactor? Maibe is not a transformer and it is just a line REACTOR. Meaning is just a series inductance.

[@Alexander470815]

@@RotarySMP How much current do you need? I have two Danfoss 130B2444 sine wave filters here i purchased a while ago for 15€. They are rated 10A at 50Hz and 7.5A at 100Hz and are about 27x21x10cm. Maybe you can put one to good use? edit: Without the metal case it shrinks to 21x21x7.5cm

[@Paddington60]

Hope you have a good holiday and thanks for the videos!

[@RotarySMP]

Thanks very much. You as well.

[@wolfgangbalu1253]

Frohe Weihnachten und ich freue mich schon auf die zukünftigen Videos LG Wolfgang

[@RotarySMP]

Danke Frohe Weihnachten.

[@ferrumignis]

The RC networks are definitely "snubbers". You could imagine the capacitor as a kind of frequency sensitive variable resistor, it has a low impedance to high frequencies (i.e. the fast edges of a noise spike) which allows the energy to be dumped into the resistors, but the rest of the time is has a high impedance and allowing little current to flow. This is an oversimplification but describes the basic action. BTW, I like the wooden surface plate you used with your height gauge when marking out the box 😁 Happy Christmas!

[@RotarySMP]

I was wondering if anyone would comment on the surface plate :) Especially as the granite one was just out of picture right. Figured for angle grinder work, that would be close enough. Thanks for the feedback on the RC filter.

[@bostedtap8399]

Another very Interesting video, thanks for sharing. May I wish all a safe Christmas.

[@RotarySMP]

Thanks for the kind feedback. Merry Christmas.

[@JoseSilveira-newhandleforYT]

Wish you and your family a great Christmas! PS: I love your surface plate 🙂

[@RotarySMP]

Thanks, you and your family as well. Old doors are accurate right? :)

[@JoseSilveira-newhandleforYT]

@@RotarySMP LOL. Thanks :-)

[@RobB_VK6ES]

Quick tip for the milling of thin materials. Offset the cutter so it only cuts tangentially on the periphery. This has the effect of directing the cutting forces longitudinally rather than transversely.

[@RotarySMP]

I actually tried that on another side, but it excited that peice so badly I had to stop. But generally, I do that.

[@poprawa]

sand blasting is great as prep for gluing stuff together too

[@RotarySMP]

True. Especially that black casting slag I use on ferrous parts. Leaves a nice raw finish.

[@bradthayer6782]

You are becoming the king of repurposing sheet metal boxes. First rate work. Whoever inherits this and wants to install sentient control circuits will never know. And your view on air travel is entertaining; it’s all about the engines.

[@RotarySMP]

You understand me. It is all about the engines. Imagine how reliable those engines would be if people would stop bolting them to aerplanes :) Actually the do, the GE LM2500 industrial gas turbine uses the same core as the CFM56. There are two of them as emergency power plants at Viennas general hospital.

[@bradthayer6782]

@@RotarySMP I toured the WPAFB museum of flight with an engineer that worked at P&W for years and he talked about every aircraft in terms of its engines. It was a unique and fascinating tour.

[@RotarySMP]

@@bradthayer6782 Gas turbines really are a marvel of cutting edge technlogy and process engineering. I once got to tour GE's private corporate engine musuem in the basement in Evandale. Fantastic.

[@helmutzollner5496]

Hi Mark! Some more progress! Well done! But I have to say, you ARE a glutton for punishment. When I heard you say you wanted to cut down the box, I was stunned. NOT AGAIN, but the results prove you right. It looks pretty neat with the new slimmer profile. Keep up the good work. Have a great Christmas!

[@RotarySMP]

Thanks. That should let me move the lathe about 6cm closer to the wall. In a small shop, it all helps. Merry Xmas.

[@lwilton]

Merry Christmas and a happy New Year to you. Depending on how those Rs and Cs are wired they could be snubbers, low pass filters, or high pass filters. A snubber is an R and a C in series, usually across a winding or a switch contact. A capacitor has a lower resistance at a higher frequency. So for a sharp spike it can have close to zero resistance, that is, effectively a short circuit. If you just put a large cap itself across the winding or contacts it could draw enough current to potentially damage the cap. So you put a relatively low-value resistor in series to set the minimum resistance of the series R-C snubber circuit. Low pass and high pass filters are 3 terminal devices. A low-pass filter passes low frequencies at about full level, but reduces the level of high frequencies. You do this with a R in series between the input and output and a C from the output terminal to ground. This makes a voltage divider with the R and the C. Since the resistance of the C gets lower with higher frequencies, it makes the lower leg of the divider smaller and smaller, shunting the higher frequencies. A high pass filter is just the other way around, a C in series between the input and output and an R from the output to ground. The resistance of the C is very high at low frequencies, so not much gets thru. It gets less and less at higher frequencies, and eventually the R can be completely ignored because the resistance of the C is so much smaller, and all the signal gets thru. Probably more than you wanted to know, but there it is. :-) Out of curiosity, if you don't mind me asking, what do you do when you aren't in the shop? Obviously something to do with flying whales and I guess the engines that make them fly, but that's as close as I can guess.

[@RotarySMP]

Thanks for the detailed description. In this case each line of the motor windings had a resistor, in series with a capacitor to ground. I am an aircraft mechanic, but migrated to office work, (quality and inspections) and do aircraft inspections on these trips.

[@MatthewTinker-au-pont-blanc]

When I was a kid, a long time ago, I was the only Matthew........... All the best, Matthew

[@RotarySMP]

All the best Matthew.

[@TomChame]

Thanks for the videos, enjoyed them all. All the best for the New Year from Panama.

[@RotarySMP]

Merry Christmas. No white Christmas in Panama this years :) Actually we haventy had one in years either.

[@joell439]

Merry Christmas 🎄 2022 is going to be awesome 👍👍😎👍👍

[@RotarySMP]

I hope so as well. Meryy Xmas to you as well.

[@harlech2]

Merry Christmas!

[@RotarySMP]

Thanks. Merry christmas.

[@jster1963]

Losing an airliner motor mount is BAD!😬. Great info, thx…..

[@RotarySMP]

Yeah suboptimal. Did you ever experience an engine failure live Jasper? I image the pucker factor is higher in the single engine fighter with the glide ratio of a set of car keys :)

[@jster1963]

@@RotarySMP In 34 years of flying jets, I've never lost an engine. I've had 1 compressor stall from flying through my wingman's wake, but I didn't even know it until the crew chief told me. It was a smart GE engine that fixed it in less than a second and didn't tell me because I didn't need to know. Cool, huh? And I've had 2 afterburner stalls that I caused but the engine was fine and kept on running. Jet engines are SO reliable. The F16 glide ratio was the same as the space shuttle. We practiced engine out landings all the time. The good news in a fighter is you always have the ejection seat. I'm thankful I had an uneventful career......

[@RotarySMP]

@@jster1963 You must have a load of good stories to tell. Since most people never experienced any of this, even simple things like strapping in a fighter are probably interesting to the rest of us. you should start sprinkling them into your videos. Merry Christmas.

[@jster1963]

@@RotarySMP I love how guys share stories with their videos. I’ve often wondered if anyone would like if I did that. I may just try that. Thank you so much!

[@RotarySMP]

@@jster1963 This gets a lot of positive feedback. I am sure your stories will as well.

[@RocanMotor]

Wasn't expecting to see Malta in this :)

[@RotarySMP]

Good spottiing.

[@RocanMotor]

@@RotarySMP it's so tiny you have to squint as you flyover or you'll miss it. Really enjoying the channel, have absolutely binged your videos since discovering. Maybe one day we can collaborate on a project. I've been slow to post recently (big life events to deal with), but have a lot of content on the horizon as I get my business off the ground. I love your approach and style, not to mention your choice of machinery. - David

[@stefanhertweck]

It looks like you have a cool dayjob rotating around jet engines? Also interesting to see, how you convinced the box to cooperate with you ... I am curious to see the progress and the first chips. Have a nice holiday and say hello to the Grinch. Greetings from Germany, Stefan.

[@RotarySMP]

Thanks. I also look forward to first chips, but expect another 20+ videos before I get that far.

[@stefanhertweck]

In mathematical terms "20+" can mean a lot, probably including infinity. I hope not :)

[@RotarySMP]

@@stefanhertweck I would never have thought going into it that the mini-lathe would need 40 episodes to complete :) Planning is not my strength.

[@DavidKutzler]

"Spiky Voltage" is a great name for a rock band.

[@RotarySMP]

True. I can picture the big hair :)

[@Chris-kk8xg]

SLT is my favorite broadcaster

[@RotarySMP]

Thanks for the comment.

[@paulwomack5866]

When doing "rough scribing" (like you did to cut the box down) I use a lab stand "bosshead" (had to google the name) to fix a sharpie to a scribing block. Good clear mark, easy to do, no need to prep with masking tape.

[@RotarySMP]

Yeah, that tearing on the tape was not ideal, but then again, an angle grinder is not a precision tool, regardless of what Nico says :)

[@danielepatane3841]

Great Video, Next time You flight over my head (Catania) let me know 🙂We may have a coffee 🙂 Greetings

[@RotarySMP]

Thanks. Beautiful views of central Italy on that flight.

[@cavemaneca]

If it's any reassurance, it seems pretty common for manufacturers to sell line and load reactors as the same part number.

[@RotarySMP]

Good to know. Thanks.

[@Rostol]

There was a famous accident where a Delta? American ? Dc-10 lost an engine literally, like fell and rolled OVER the wing. It was due to an unapproved maintenance procedure (they lowered the engine in a way that was not the appropriate, they'd used like 2 forklifts instead of a hoist/crane, stressing and cracking the rear mount) Happy Christmas

[@RotarySMP]

AA Flight 191. Worst air disaster on US soil. en.wikipedia.org/wiki/American_Airlines_Flight_191#Probable_cause

[@vincei4252]

RC Snubber, my man. I haven't read the comments but I'm sure somone else said the same.

[@RotarySMP]

You got it. On both :) Thanks.

[@randyhager2054]

Merry Christmas Mark. I have an Italian friend that is a pilot for Ryan Air. Was one of my trainees from Leonardo(old Alenia Aermacchi)learning the F-35 manufacturing. Don't have the slightest idea what all those things are your installing but it sure is interesting to see you put it all together.

[@RotarySMP]

Merry Christmas. I thought it was cool how that Ryan Air 737 looked taxiing out of it's parking position in time lapse.

[@MuscleCarGarage2022]

Ahhh, Sunday morning breakfast and lathe talk. Not sure it gets any better. Wait! Where's my coffee...

[@RotarySMP]

Thanks for the comments. Helps train the algorythm.

[@julias-shed]

That junction box was a lot less painful than the electrical box 😀

[@RotarySMP]

You are right about that. Nice that I got to recycle the flange.

[@GroovyVideo2]

Had engine hold pin from I think B47 - - think there was 3 pins total each engine - was 20 mm dia x 80mm long

[@RotarySMP]

High quality steel that.

[@petevance422]

Love the thumbnail

[@RotarySMP]

Thanks. My mates idea.

[@mounty8807]

Hi Mark. Congrats to another gelungener Vid! Klasse, Mon! You should have shown the Bolts they use to attach the TRW to the A/C. I've seen people make fly cutters of them. Good Military Grade steel. On that last bit of film, (from the CFM-56-5A I believe it was), the Bolt Retainers are a 'soft spot'. Whilst attached to the wing, under load, they are positioned mittig/central. When off-wing, gravity causes them to 'rub' on the rods. Of course, the Limits for damage off wing are like Mückenschiß, we have to inspect this frequently, in shop. No better idea came up, what, 25 yrs of production? The 'new' PW1100 has a fail safe pin. Dia like a coke can, maybe a foot long, SOLID STEEL!!! Heavy Metal... See You Später. Frohes und Happyes Fest, ja?

[@RotarySMP]

Thanks for that. This was a -5B/3 engine. Good point. I have a few bolts laying on my shelf at work.

[@TrPrecisionMachining]

very good job rotarySMP...merry chistmas

[@RotarySMP]

Thanks for your consistant comments. It really helps. Merry christmas.

[@claeswikberg8958]

merry Christmas!

[@RotarySMP]

Thanks. Merry Christmas.

[@rycudas]

A resistor and a capacitor to ground like that are probably forming a low pass filter. Help take out voltage spikes.

[@RotarySMP]

THanks for the feedback.

[@MidEngineering]

"Pop down to Malta for work". Wait, what? (I'm new to your channel & had guessed you were in Australia. Got that a bit wrong...)

[@RotarySMP]

Nope. A kiwi in Austria. Thanks for watching.

[@steamfan7147]

Okay, so here is the support for using a line reactor, or in your case as a load reactor. This is lifted from "Applications of Line and Load Reactors with Variable Frequency Drives" availible online. "Load reactors (also called an output reactor) are installed after the VFD to protect the motor. They can increase load inductance and reduce the effect of reflected waves. If a load reactor is used at the output, it should be located as close to the VFD as possible." Now much of this by the book, has to due with long runs of wire between drive and motor. However, it has been my experience, that older motors, especially those built before inverters were in common use, operate smoother and noticely cooler when a load reactor is included.

[@RotarySMP]

That is encouraging. Thanks for looking up the reference.

[@fuzzy1dk]

and less noise potentially affecting nearby electronics

[@RotarySMP]

@@fuzzy1dk Thanks for your input.

[@MarkMarooth]

Hey Mark, another Mark here, living in the Western Isles of Scotland though I'm from Australia. Been enjoying this series very much! Noticed you have a wee metal vice that shows up in videos, kinda an elongated H on the sides. Are there dimensions for it anywhere? I'd like to model it, produce some drawings and then make it once my forever workshop is built next spring. Have a great Christmas!

[@RotarySMP]

Hi Mark. That was our RNZAF apprenticeship basic engineering project. They just gave us steel, blunt hacksaws, blunt files, and enough food to keep at it till it looked like that. I already drew up some rough sketch for another viewer. Drop me an Email (address is on the channel home page), and I see if I can find that sketch.

[@CorollaGTSSRX]

Kind of a goofy question, but do you indicate when you put something in the lathe? I haven't watched all of your videos yet, but I don't think I've seen you do it once :)

[@RotarySMP]

Not sure what you mean by indicate?

[@CorollaGTSSRX]

@@RotarySMP Using an indicator dial to make sure it's centered. Most of the things you make in the lathe don't look like they need to be precise, but I was just curious

[@RotarySMP]

@@CorollaGTSSRX It depends. If I am using round stock, and can machine the part in a single set up, you dont need to indicate, as the first cut trues the stock to the lathes axis of rotation. If you need to hold an unusually shaped part, or reverse a partially machined part to turn features on the other end, you either have to indicate it back in (4 jaw independant chuck), or use accurate/repeatable workholding (collets).

[@danielabbey7726]

Really enjoying your recent videos on the Schaublin. Would be interested in learning more about line reactors and smoothing out VFD voltage spikes - it seems to be a black art reserved for electrical engineers.

[@Alexander470815]

A line reactor is for the input side of the VFD to improve its power factor. You want to use a output filter made as a LC filter. A reactor alone will do almost nothing against the voltage spikes. Sometimtes it is called dU dT filter or sine wave filter. This will give you a sinusoidal output voltage that a old motor will take with no problems.

[@RotarySMP]

Thanks for the description.

[@HM-Projects]

It'd be good to know if the line reactor helps, mine takes the peaks off but it's still noisy. A good VFD probably helps but my import version is doing the job so far. Also helps to pay attention to the shielding of signal cables connected to the VFD.

[@RotarySMP]

Thanks for the info on that. I have beed told to use shielded cable, but it is hard to replace what is already installed and the right length ;(

[@chronokoks]

western companies price proper shielded cables into orbit. Sure you can get some PVC ones (only occasional use for moving parts), but once you want something for moving machinery (CNC, automation, robotics, etc) like PUR for many million cycles, only few are available, you have to buy at least 100m and the price is like 400 euro (lowest of low end - barely usable) and up. The companies know you're building machines so they're like - oh well let's price accordingly.

[@Alexander470815]

A line reactor is not the suitable device for that. Thats why its called a line reactor, it is for the mains side of the VFD to improve its power factor. For the motor side you want to use a LC filter often times called a sine wave filter. They will smooth out the PWM mess coming out of the VFD to a sinusoidal voltage and protecting the windings.

[@mr.reflect1027]

@@chronokoks Why would you need Trailing-Cable for the stationary spindlemotor? Simple Ölflex Classic CY will do the trick nicely and its available in price-per-meter lengths for not that much money on the internet. The Axis-Drives and motors would definetly need shielded cables too but its likely that theyre supplied with the according cables anyway

[@chronokoks]

@@mr.reflect1027 Never once said I anything about a stationary spindle motor on a lathe ;) Since I have been in the used machines market my whole life, no - servos you buy used for vairous reasons on average don't come with cables nor do the drives and if they do, the length is not what you need. Just about 2 weeks ago I bought 3 small 750w yaskawas with drives from an unknown machine and surprise surprise somebody snipped off cables even before the connectors. The PUR/TPE cable conspiracy has been bugging me since forever.

[@DPTech_workroom]

Looks good! 👍

[@RotarySMP]

Thanks for the feedback. It helps.

[@cda32]

That thumbnail picture is epic 🤣

[@RotarySMP]

Thanks. I wasnt sure if it was too clickbaity?

[@RasmusHuusom]

The line reactor is for the other side og the VFD, also remember to ground EVERYTHING! on the machine

[@RotarySMP]

Thanks. Will do. The Schaublin already has a couple of nice ground bus bars I will recycle.

[@RasmusHuusom]

@@RotarySMP another thing is noise from that vfd and what else you got in the cabinet it could f-up a lot of things if the cables are unshielded or the shielding isn't grounded correctly

[@RotarySMP]

@@RasmusHuusom Thanks, yeah, it could become a noisy environment.

[@TheAppelsiini123]

Schaublin has made a very very impressive machine considering it's from the 70's

[@RotarySMP]

The bed and head stock are pretty similar to the manual 125's. Sure are nicely made machines.

[@UncleKennysPlace]

Jet engine mounts are meant to fail before the wing spar itself, and drop a wonky engine; the pins are essentially "fuses". If those let loose, something really, really bad has happened, such as several fan blades failing or an "uncontained" engine explosion.

[@RotarySMP]

Yes and no. Dropping an engine is considered hazardous under Part-25, so the massive imbalance of blade failure is normally addressed by a frangible 1B bearing housing, allowing the front of the N1 to gyrate rather than trying to react the imbalance. AA flight 191 showed how destructive pylon failure at high power is.

[@mounty8807]

@@RotarySMP Wasn't that the flight where the engine wrapped itself around the wing, tearing loose?? Over Holland, or Lockerby, no? Been a while, for sure....

[@fuzzy1dk]

@@RotarySMP yeh, kzbin.info/www/bejne/m2TPq5qoe9qAatU , but as with shown with UAL 1175 being far away from an airport with a massively vibrating, draggy engine has it's own problems

[@RotarySMP]

@@fuzzy1dk There have been a few incidents in the last couple of decades where seriously damaged engines keep windmilling, with vibratio amplitudes sufficient to fatigue structures, although the design should have lead to seizure after such damge. Clear non-compliance to CS-E 525 / Far 33.74 www.easa.europa.eu/downloads/109691/en

[@fuzzy1dk]

@@RotarySMP I'm just a guy that occasionally watches "air crash investigations" but it did make me wonder how much ETOPS/EDTO certification is worth if it is just based on an engine not running, if the more likely scenario is that an engine fails in a way that affect the planes performance much more than that

[@DanielHeineck]

Etna and all of Sicily was under cloud cover? :) Seems like others nailed it, the RC circuits were likely used for snubbing voltage spikes to/from the motor (or relay circuits, but usually those would be *far* smaller) Happy Holidays!

[@RotarySMP]

Yeah, ,but the cloud stopped at the southern coast of Sicily, so you could see the large ship traffic on the med north of Malta. Great views that trip.

[@cantsolvesudokus]

Interesting, in all the documentaries i watched they always only show those two big bolts wich they shrink down with nitrogen so it fits the engine mounts. In a couple seconds you covered more than these documentaries :)

[@RotarySMP]

The manintenance disconnect could not be an interference fit, as you would never get the engine off and back on without damage each time. You also need the alternate load paths of multiple bolts and parts to make it fail safe, so I dont know of any modern installation which uses two bolts and an interference fit.

[@cantsolvesudokus]

@@RotarySMP i just skipped through 3 different documentaries and can’t find the scene. I must have gotten something mixed up. Of course it makes sense: how would they dismount the engine if it’s more or less mounted permanently in place…

[@RotarySMP]

@@cantsolvesudokus Seems everything ever thought of has been tried out in aviation :)

[@MuscleCarGarage2022]

Merry Christmas

[@RotarySMP]

Thanks, you as well.

[@paulerenberger1286]

A other option for anyone is soft copper tubing, use it as a sleeve and form it as you want

[@RotarySMP]

Good idea. I think should now work.

[@jeangade5809]

Merry x-mas

[@RotarySMP]

Thanks. Merry Christmas.

[@mfx1]

Er line reactors are more meant to protect the VFD NOT the motor you CAN put them between the VFD and motor to reduce current distortion and then it would be called a load reactor not a line reactor but if you want to filter spikes then you need a low pass filter which you already had (although the caps might be a bit past it) and VFD's have output filters anyway.

[@RotarySMP]

THanks, seems every electrical expert has a different opinion this area :/

[@jimsvideos7201]

Malta seems nice, but time away from home is still time away from home.

[@RotarySMP]

Yeah. Nice views out the window on the flight, but such trips are airport-->hangar-->hotel--> rinse and repeat.

[@TheJerome1502]

Me who cannot find a decent electrical enclosure for my e-skateboard, seeing you chopping up perfectly good metal boxes : *indescribable anger* Me the rest of the video: r/oddlysatisfying

[@RotarySMP]

Glad you enjoyed that.

[@kv4302]

Someone who searches for information on how airliner engines are held on is gonna be SO confused when they find this video.

[@RotarySMP]

Oh well. Maybe a few of them enjoy it anyway, and discover their long suppressed love of Schaublin :)

[@janosnagyj.9540]

7:21 That little oil leak doesn't look nice 😅 Does it anything to do with the dampening process during the milling? 😉

[@RotarySMP]

It was when I lifted the mill vise off the Maho on the bench, I knocked the finger against the sharp edge of the jaw and it leaked.

[@ptonpc]

Merry Xmas everyone.

[@RotarySMP]

Thanks and Merry Christmas.

[@bchdsailor]

It's getting there, enjoy your winter feast Anytime being accused of fighting with a cat after a shift having your arms inside an engine nacelle.?

[@RotarySMP]

Yeah, especially if people lockwired and didnt make nice folded tails.

[@StraightLineCycles]

Chop it down, with the edge of my hand! 🎶 voodoo schaublin

[@RotarySMP]

I chopped it, it chopped my finger. We are even... for now.

[@mahanehsani1246]

isnt that _filter capacitor_ ? very nice video

[@RotarySMP]

Thanks for the kind feedback.

[@mahanehsani1246]

@@RotarySMP when you talk about aerospace...I'm in!

[@tandemcompound2]

are the jet mounts steel or aluminum

[@RotarySMP]

Corrosion resistant steel. You can't meet fire protection requirements with aluminium alloys.

[@eriklycktner3193]

Hi, I have a little odd question for you, I’m renovating an old Cincinnati milling machine and have a broken gear inside my feeding gearbox. My question is if you have any interest to try to help me make a new one? If so I will send you the broken gear for measurements 😇

[@RotarySMP]

Sorry, but I am not equipped for gear cutting. Probably should, as I need to make a DP11 helical gear for my bandsaw gearbox.

[@eriklycktner3193]

@@RotarySMP okay thank you for responding 👍🏼. I will have to continues to search for some help. By the way I love your channel and wish you the best! Keep up the good work 👍🏼👍🏼

[@jameshisself9324]

Mmmmmm.... Stromboli. Low pass RC filter might be the term you were looking for? Cheers

[@RotarySMP]

Thanks. That was it.

[@chucksmith7166]

I think they are regeneration coils

[@RotarySMP]

Thanks for the feedback,.

[@Sigmatechnica]

I think you need to take that name plate off and run it through the ultrasonic cleaner.

[@RotarySMP]

No way, that would get it clear, and what would I do for the next 20 videos?

[@joshrumbel6564]

Bloooood!

[@RotarySMP]

Yeah. I was a little careless there.

[@joshrumbel6564]

Lol

[@StraightLineCycles]

I need a lathe, for sure

[@RotarySMP]

Or three :) Everyone needs a lathe. Like a screwdriver.

[@JamesChurchill3]

Either your toothbrush has grown or you've shrunk your lathe.

[@RotarySMP]

:) I like that.

[@Rustinox]

I don't know if it's an interesting job you do, but I 'd like to think it could be worse :-)

[@RotarySMP]

Thanks. I like looking at planes.

[@SidneyCritic]

If you catch a paint run when it's still wet you can lightly brush it with a fine bristle paint brush and blend it in somewhat, ie, quicker to dry and quicker to sand. That window view reminds me of this gag vid - kzbin.info/www/bejne/q4DRmGmlerpnr6c - rofl -

[@RotarySMP]

Good point. Especially with undercoat, when I was always going to need to sand, it would have saved a bit of drynig time and thickness. :)

[@mrspeaky6885]

How much did you pay again for transport?

[@RotarySMP]

Of the Schaublin? I think it came to about €1400. Roughly thirds for pickup and transport frmo CH to AT, customs charges, and local delivery into my drivework.

[@mrspeaky6885]

@@RotarySMP Oh lol i was asking because we got a Weiler Primus NC for 1400€ with shipping recently and i was thinking that was in about your price range of the schaublin never mind if that was already the shipping cost alone 🤡 Its a nice lathe though

[@RotarySMP]

@@mrspeaky6885 Yeah, those "small" Weiler CNC's were also on my list of idea home shop lathes. Nice price you got there. Do you have any photos of it posted anywhere? Is the controller in good shape, or will you retrofit it?

[@mrspeaky6885]

@@RotarySMP It was actually completely functional, we even had the entire electrical cabinet as a spare part and a second spindle motor and second sauter turret second hydraulics everything, but as you know space is a scarce thing so we are gonna retrofit it. The electrical cabinet had a larger footprint than the entire machine. now with new ac servos we can fit the entire thing into the cabinet of the screen itself i can send you pics on discord if you want to

[@RotarySMP]

@@mrspeaky6885 I'd like to see that.

[@ViniciusMiguel1988]

Marc if you don’t manage to find the proper filter I can design one for you.

[@RotarySMP]

Thanks, another viewer sold me one. Should arrive soon

[@Preso58]

How come you always manage to snag a window seat? Don't tell me, you fly business class. I believe economy class is called "self loading freight".

[@RotarySMP]

Nope. Haven't flown business in ages. This flight to Malta only had about 30 people on an A319. On the flight back, I went via Zurich, and the plane was also pretty empty. I switched from LH to RH window seat as we approached the Alps with the setting sun behind. Looked really cool. The last leg from Zurich to Vienna was chock a block, and I was not at a window.

[@gordonjones1516]

Your slag hammer looks like Woody Woodpecker :)

[@RotarySMP]

In green :)

[@ericfeatherstone]

7:22 It's not haloween any more; no need for that red dye on your fingers mate!

[@RotarySMP]

Yeah, tapped the finger wrong on the sharp edge of a vise and then my finger leaked.

[@ericfeatherstone]

@@RotarySMP Luckily, like aircraft engine mounts, you have redundant fingers ;-)

[@RotarySMP]

@@ericfeatherstone I dont even want to think about that. :)

[@MakarovFox]

Chopping time

[@RotarySMP]

Yeap. Again. Thanks for the comment.

[@MakarovFox]

@@RotarySMP :)

[@dingus153]

"because engine mount failures are considered uncool" pfft what are you, the cool police?

[@RotarySMP]

Good call. Who am I to say!

[@henrychan720]

You really do like chopping down boxes don't you?

[@RotarySMP]

Yeah. Although to save machine area/ foot print in my shop. I am running out of ones to chop on this project.

[@E1nsty]

nameplate spotted

[@RotarySMP]

Where?