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1:24 AM
@Pᴀᴜʟsᴛᴇʀ2 Sounds American.
 
1:47 AM
@anonymous2 No. Just encouraging you to be patriotic. Believe me when I say, I have a lot of affection for you Canooks (as long as that's not an offensive term!!!)
 
2:14 AM
@Pᴀᴜʟsᴛᴇʀ2 Not at all. We take all sorts of names.
 
Kewlio. We Americans can be offensive sometimes ... wouldn't want to be "that guy" ...
 
Lol, it's fine, I've met some pretty, er, forceful Americans (not on mech.se), and I've kind of learned how to handle them.
People like you are just fun to have open discussions with.
 
I made a lot of trips into Canada as a kid. I was raised in Montana, so I've been to Alberta and BC many times.
I always found the people there to just be nothing more than an extension of what we were ... good people enjoying the Great NW.
 
Sure. We cross down from time to time too, and though we do notice distinct differences, basically, human nature remains human nature.
 
2:30 AM
And human nature rolls both ways. When I was in Junior HIgh School we did exchanges with a town up in Canada. They'd come down for a day, we'd go up for a day. Did that several years growing up. It was always interesting and always fun.
Anyway, you have a great evening. I'm headed to bed ... it's been a long day ... yesterday was a long day. I just never seem to get enough sleep.
 
Can sympathise entirely. I'm turning in soon too.
Have a great night... See you, probably Monday.
 
2:48 AM
:o)
 
How many bucks does this beauty go for?
If they're donating €1000 per watch I expect it'll be at least €4000 - €5000
It costs $17,000 : ablogtowatch.com/…
 
 
3 hours later…
6:10 AM
@Zaid Nice plaything, you are into watches?
 
6:27 AM
@Myself not much, but every now and again I get this itch to buy a fancy one. I admire the craftsmanship.
Not at this price level, mind
The Seiko SARB017 Alpinist ticks all the boxes for me
 
6:55 AM
@Zaid At the moment I do not own a watch. Since most gadgets show the time I do not need one
Perhaps one day I will give in and buy a swatch irony or something like this
Although I spend too much money for fancy tools
2
 
7:11 AM
@Myself I think it's a common problem for most of us in this chat :)
 
7:46 AM
@Zaid My latest purchase on a firesale
 
8:12 AM
@Myself no three-jaw puller? I see a two-jaw puller, spring compressors and something which looks like a two-jaw expander
 
8:49 AM
There is a ball joint puller, a small two jaw puller and a larger one, two spring compressors and a set of internal extractors inclusive counterhold and a sliding hammer
The three-legged puller will be bought sometimes
 
 
4 hours later…
12:30 PM
@Myself - And you didn't get me one as well? :o)
For those who may care to know, my son and I got the engine into the Impreza as much as we could yesterday. I believe we have accounted for all of the vacuum lines an plugged all of the extraneous holes. Two major things we still have to do, which is the cooling system and the wiring. The wiring is going to be by far the hardest, but I believe I have the lion's share of the harness done. There are a few odds/ends I need to account for. We need to tear the rest of his dash stuff out.
Like the A/C box. This will allow us to get to the current Impreza wiring. I need to find a bunch of stuff in the current wiring, such as the wires for starter signal and the fuel pump. Without these, the engine isn't going to do anything. I have the plans, so it shouldn't be too difficult. I don't know how much we'll get done today, but hopefully by week's end, I'll have this doggy running.
Cooling system still needs to be sorted. We have a plan in place, but the work still needs to be done with all of the hoses ran and the radiator put into its final home. We still need to get a pusher fan to put in front of the radiator. I found a set off of a MB SUV. It was at the pick-a-part yard. I couldn't get in on it though, or I'd have bought them. Sitting pretty for us to snatch ... I'd need to go back with a portable sawzall to get them. They'd be a lot cheaper than buying them.
They are probably thicker by quite a bit, too. Space is very limited up front. We'll have to cut back the bumper and support to get fans to fit, but we'll need them to keep it cool in the summer time. Vehicle won't be moving all the time, lol.
 
1:32 PM
@Pᴀᴜʟsᴛᴇʀ2 sounds like you're getting there then! Nothing like the feeling you get when you know it's actually going to work!
 
@NickC - I'm sure it will work. It's just a lot of work to get it done.
We are getting there.
 
 
2 hours later…
3:36 PM
Sounds good @Pᴀᴜʟsᴛᴇʀ2. Bunch of effort, but a good reward at the end of it.
I hadn't realised that about mass of impact sockets being the key difference
 
 
2 hours later…
5:33 PM
@RoryAlsop - I didn't either until I saw that Lisle socket in action. I had no clue, but it makes a lot of sense.
 
6:01 PM
0
Q: Why doesn't ${@:-1} return the last element of $@?

ZaidI thought to post up a Q&A on this as I did not find anything similar. If it already exists, please mark this as a duplicate. Take the following code, running under Bash shell, doesn't work (should return just f): $ set -- a b c d e f $ echo ${@:-1} a b c d e f

Bash is... quirky
(This coming from a Perl guy ;)
 
6:17 PM
@Zaid - I hate white space.
 
@Pᴀᴜʟsᴛᴇʀ2 was that you who just upvoted?
 
Absolutely.
SO needs more voters.
 
You can say that again
 
And since it's you ... I'm all over it like stink on poo.
 
SO needs moar
Eww
Anyway. How's the wiring coming along?
 
6:20 PM
We pulled the old wiring harness back. Looking to see where we might be able to stow the new ECU. Great fun.
I'll have an new blog post up later.
 
The weather's improving here... soon it'll be barbecue season
 
I'm sure it will be. Are you within the tropics?
 
Not quite
 
Close enough, though, lol.
Why BBQ season? I'm assuming you mean it starts getting hotter there?
I would think it would start cooling down a little bit during the upcoming months.
 
It's nice to huddle around a barbecue in winter. These are desert winters mind. Chilly winds
 
6:29 PM
Okay, gotcha
"actual" BBQ weather. When you can fire up the BBQ and not worry about roasting yourself out of your own skin.
 
Lol
 
I'd bet in the summer time you don't even need charcoal to fire up the grill.
Also, "hot/cold" are relative terms ... where you're at, cold is still pretty hot I bet.
Does being out on the peninsula help any? And I think I've asked you this question before, lol.
 
Oh, it gets cold
 
Define "cold"?
 
Not sub zero but wind chill makes up for it
Even Europeans find it cold
 
7:12 PM
Now the votes are racking up
 
I noticed that.
 
 
1 hour later…
8:24 PM
We're getting real high-quality questions
3
Q: How to re-torque a partially loosened overhead camshaft?

Ryan V. BissellWhile doing a timing belt service on my 17 year-old, 57K-mile truck (DOHC), I was having a very hard time getting it to let go of the front oil seals on the intake camshafts.1 I eventually realized that, since I was also needing to replace my leaking valve cover gaskets, I might as well just cr...

 
@Zaid I like that one
 
My feeling is, loosen all of the bolts, then torque them accordingly.
 
@Myself here is one of his previous questions
 
So would I
 
6
Q: Why are these paint dots under the timing belt cover not consistent?

Ryan V. BissellI am about midway done with changing the timing belt & water pump on my 99 Toyota, which features a 6-cylinder 5VZ-FE engine. After getting the front timing cover off, I discovered that there were some paint dots on the rear timing cover, and also both cam pulleys. (Despite the vehicle's age in...

 
8:29 PM
Really you shouldn't just loosen one end, as you run the risk of warping the cam shafts.
 
@Pᴀᴜʟsᴛᴇʀ2 I'm not sure I follow the concern regarding "stress-buildup"
 
Stress-buildup I didn't understand either.
 
3
Q: Can cats leave scratch marks on cars?

earlyriser01I live in an apartment complex with some stray cats. I have multiple sets of scratch marks on the side doors of my car. I am unsure if these are from cats or from someone keying my car. Is it possible for cats to scratch car paint? Here are some of the pictures. I have more pictures but s...

Another cat question, yippee!
 
It sure looks like cat scratch fever to me.
 
@Zaid You guys do not want to know what a marten can do with your car
 
8:33 PM
@Myself I'm sure the OP does (looks like a lady judging by the footwear)
 
A marten is something different
Once one ate my wipers
 
Nice
You shouldn't use that tasty rubber ... tends to attract the unsavory types.
 
Other damages include: window rubber gasket, exhaust temperature sensor wiring, vacuum hose, abs wiring, car antenna
 
Wow... a marten with a vendetta :)
 
8:38 PM
Also the rubber sleeve(?) on the tie rods
 
Got it, ty
 
Great fun, the mechanic always laughed when I got to him.
 
0
A: Can cats leave scratch marks on cars?

ZaidIt's hard to be sure, but that looks like single-stage paint (without a hard-wearing clearcoat). If so, it is relatively soft paint that could easily be scratched. Judging by the angle of attack (and prior knowledge of feline behaviour), I would say that those are scratches made by cats that wen...

I tried to stay objective
 
8:41 PM
Cats and the internet ... Meow
 
@Pᴀᴜʟsᴛᴇʀ2 Please help my with one of your answers
3
A: Impact vs. Regular Sockets

Pᴀᴜʟsᴛᴇʀ2Something which has not been mentioned in the other two posts about impact sockets is the mass. While the material used for impact sockets is more robust and will stand up to a lot more abuse, the real reason there is more material in the socket is for mass. The impact gun throws the mass of the ...

 
I am not totally sure about the more mass=more impact
 
What is it you are having issues with?
 
I am under the assumption that more mass on the socket means less impact
 
8:44 PM
Let's look at Newton' 2nd, which basically says, "Mass in motion stays in motion"
 
Since the "flywheel" in the impact gun needs to spin also the heavy socket and not only the targeted bolt
As far as I understand there is a thing (lets call it the flywheel) in the impact gun that speeds up
 
The impact gun transfers impact into the socket, the heavier socket tends to stay in motion, transfers the impact of greater mass into the fastener.
 
.. some "clutch" then connects the "flywheel" to the "output shaft"
.. thereby generating the impact
As far as I understand it the large socket is a liability (because of his higher inertia)
since also the sockets needs to get accelerated
And a higher inertia on the "output shaft", inclusive sockets mean that more "impact energy" gets consumed
..before it arrives on the bolt
 
To me it means, more impact energy is getting used.
The impact energy is transferred into the socket. The socket transfers more energy into the fastener, because the mass wants to stay in motion.
 
But that would mean that an arbitrary large socket/output shaft would increase the impact energy..
 
8:51 PM
@Myself I think you have a fair point
 
It doesn't increase the impact energy, it just transfers more. It only works to a point. The impact will only transfer so much energy, then it becomes a stalemate. But if the impact has the ability to accelerate the mass of the heavier socket, would you agree more energy would be transferred through it into the fastener?
 
.. as an extreme example: An socket with the size of an car axle would then be even better, but in reality all the energy would get dissipated before it arrives on the bolt
 
Sure, but roll it back the other way. If the socket were made of paper (extreme example), it wouldn't have any mass to transfer the impact energy.
 
Lets make an other analogy: We do not use rotational movement, just axial impacts...
..lets assume a hammer->pin punch->nail example
If you use a magic pin punch(mass=0, but extremely stiff) it would still work
 
It's not the same.
I think it's a bad example.
 
8:54 PM
Your point about the paper socket:
It is the flywheel (with the high inertia) that generates the impact, the shaft and socket just have to transmit the energy
It is not the mass that transfers the energy, it is the "stiffness" of the material
At least thats how I interpret it
 
I think that's where you are going wrong. The flywheel with high inertia transfers the energy to the socket, then stops applying energy, the socket then transfers the energy to the fastener. In your example of the magic pin punch, the hammer continues to provide the inertia to transfer the energy.
 
@Pᴀᴜʟsᴛᴇʀ2 there is negligible transfer of inertia from the flywheel to the socket since they spin at the same speed at any given time
 
They don't though.
The "motor" spins continuously inside the impact device. It speeds up/slows down as the impact occurs.
The socket doesn't do the same. It speeds up only when the hammer hits home.
 
Hmm, if that's the case then you're on the money
 
So it can only transfer inertia when the hammer hits. It's not continuous.
I haven't gotten through this video yet, but in the first part they show the movement in slow motion.
 
9:02 PM
Cat question is in the HNQ
Where's @DucatiKiller when you need him? :)
 
@Pᴀᴜʟsᴛᴇʀ2 In your video: At 2:20 you should view the movement
 
@Myself - I did.
What might your point be at that moment of the video?
I thought it helped prove my point.
 
In my book the shaft only transfers the impact that gets generated when the rotating hammer hits the shaft thing
This means that the "shaft" just needs to be stiff
But a high inertia of the shaft would cause the "impact" to dissipate
Lets assume that a flywheel gets connected to the shaft..
..a rather small impact would just "nudge" it a little bit
(Please bear with me: technical English is hard English for me)
 
But you're not including the mass portion of it. If there isn't enough mass, the energy is rebounded back into the tool. The fastener would react back upon the less massed socket and you'll get no where in your effort to remove the fastener. With more mass, the energy is transferred to the fastener with greater effect. This is what Newton's 2nd is all about.
 
9:10 PM
And there is where we differ..
 
Remember, the flywheel isn't connected directly to the shaft. It's not how an impact works.
If it's connected directly, you wouldn't have the same effect.
 
..as far as I understand it the flywheel/hammer is just "connected" for the very small moment where the hammer hits the shaft
 
If it were connected directly, you'd only have the torque available which your hands could hold the tool at.
 
@Pᴀᴜʟsᴛᴇʀ2 @Myself's point is that the heavier socket will make for a slower socket rotation
 
@Zaid - I understand this and agree.
The mass only works to a certain point. Then it becomes a detriment.
But to negate the mass is taking out half of the formula
 
9:14 PM
I think that a magic shaft with mass=0, but high stiffness would still work
 
I've seen it in practical applications where the impact socket works where the regular walled socket would not. The regular socket is more than stiff enough to handle impact, but doesn't have the mass which the impact socket does, so cannot do the job.
It's the whole reason the Lisle socket I showed in the answer works where a regular impact socket doesn't in the same application.
Same impact gun. Same bolt. Lisle socket works; regular impact doesn't.
The only difference is the greater mass of the Lisle socket.
 
I am not sure..
 
@Myself I could try to explain
 
@Myself - I hope this doesn't sound like I'm railing against you. This is just my understanding and it appears I'm not explaining myself very well. I wish I could explain better or more completely.
 
..why would more more be beneficial up to a certain point and then be a detriment?
 
9:20 PM
There are two impacts here
 
@Zaid Please do
 
@Myself - If the impact device cannot spin up (or move) the mass of the impact socket, then it becomes a detriment.
 
1. The impact of the flywheel against the socket
2. The impact of the socket against the nut/bolt
 
@Pᴀᴜʟsᴛᴇʀ2 No negative feelings on my side, I just want to bring my thoughts through. Am I am not totally convinced about my points either
 
@Myself - Good, and no worries.
 
9:22 PM
@Pᴀᴜʟsᴛᴇʀ2's point is that the energy of the flywheel is high enough that the velocity of the socket isn't impacted significantly by the heavier mass. If you look at the video, the mass of the flywheel is far greater than the mass of the output shaft, so this seems reasonable
Then there is the second impact, which is the impact of the socket against the nut/bolt
 
@Zaid ok, but that would mean that: The higher the mass of the socket gets, the more difficult it is for the flywheel to push the socket
So we have two possibilities:
 
Yes, which is why @Pᴀᴜʟsᴛᴇʀ2 said that it works up to a point. Because the velocity of the output shaft will eventually slow down enough to become important as mass increases
 
1. the flywheel pushes the shaft, the shaft transmits the energy by "leaving" the flywheel and pushing the nut/bolt
2. the flywheel pushes the shaft, the shaft is still "leaning" on the flywheel and pushes the nut/bolt
 
In case #1, if the shaft is the magic shaft you are talking about, which can transmit the energy of the "fllywheel/hammer", I think I can agree with you on that point.
 
in the second example the shaft would just be a temporary "connection" to the bolt
I am not getting my point through..
 
9:28 PM
I'm sorry to leave you here, but wife is insisting it's time for dinner. I'll be back around in a while.
 
..case #1 would be positive for your idea: It is the inertia of the shaft that takes up the impact and pushes the bolt
Bon appetite
 
@Myself I like these kinds of discussions btw
 
@Zaid I am not so sure if I understood you correctly
@Zaid I also, different opinions but a very informative and civilized way of discussing them out
@Zaid I question about my doubts of understanding you correctly are referenced about your explanation of the two impacts, not on your remark on the discussion itself
 
@Myself I don't think I've done an amazing job explaining my viewpoint either
 
I just wanted to make sure that there are no negative feelings
 
9:40 PM
Oh, not at all :)
To be honest, this sort of question would be best asked on engineering.SE
Those folks should have the relevant jargon to explain what's going on
 
I should give it a try
 
@Myself - None from me either.
 
I guess it just depends on the actual mode of operation of the thing
@Pᴀᴜʟsᴛᴇʀ2 that is great
If the mode of operation is the "billiards ball type" then @Pᴀᴜʟsᴛᴇʀ2 is correct
The the shaft is just making a temporary extension of the hammer/shaft impact then my theory would be correct
@Zaid I suppose the autumn is a season beneficial to the locals at your place?
 
@Myself because of the weather?
 
Yes
Temperature, over all
 
9:51 PM
It's more tolerable for sure.
But remember that date palms bear fruit at peak summer
 
Oh, darn.
No dates.
 
So the workers need to collect them in the worst time?
 
@Pᴀᴜʟsᴛᴇʀ2 yeah, that's what the new generation says. "Who needs dates? I'm quite happy with Cadbury and Starbucks"
 
They suck, dude.
 
@Myself that's when they become ripe, so yeah
 
9:53 PM
The "new generation"
 
Cadburry and Starbucks, my inner Italian shudders
Best coffee I ever had was in a total rundown harbor-bar in the deepest south
 
@Myself how's the pizza in your part of Italy?
 
Probably tastes Bavarian ... :o)
 
It depends on the restaurant. Most make a fairly good pizza, very Italian style
Thin bread, good crust and not too much stuff on it
 
9:56 PM
When I first visited Florence I wasn't quite prepared for what the Italians meant by pizza
I had to saw through the crust
 
I like my Pizza just about any way I can get it.
except that way.
Crust is my favorite part of the pizza, though that's probably very American of me.
 
What is considered "pizza" in your places, @Zaid @Pᴀᴜʟsᴛᴇʀ2
 
I like a very bready crust. I don't like thin.
 
@Pᴀᴜʟsᴛᴇʀ2 it doesn't come pre-cut in Italy
 
Yup
I don't mind it "not pre cut"
I don't mind it not being round.
I just don't like crust which eats like roof shingles.
 
9:58 PM
@Myself there's the international stuff (which I guess you're not interested in) and there are some local variants of pizza
 
You know, the asphalt kind you find on houses here in the States.
 
@Pᴀᴜʟsᴛᴇʀ2 that's the sort of crust I had in Italy
 
Not liking that too much.
 
@Zaid Actually, I have no problems with the "international style" pizza
@Zaid I hope (but I assume otherwise) you where not disappointed by Florence, mostly tourist traps there
 
@Myself we have something called zaatar here, which is quite popular. It's thyme on thin, soft crust baked in a furnace for about 5 mins
@Myself I was there for business. No traps per se
 
10:01 PM
@Pᴀᴜʟsᴛᴇʀ2 "roof shingles" , good one :)
 
Then there are the usual variants of meat, cheese, meat and cheese, labneh, tomato toppings
 
labneh?
@Pᴀᴜʟsᴛᴇʀ2 my wife makes the pizza actually American style
 
Yes, that's hard to describe. It's kind of like a concentrated form of yoghurt
 
@Myself - I enjoy pizza in pretty much any form. I like most toppings.
 
@Pᴀᴜʟsᴛᴇʀ2 hawaiian?
 
10:05 PM
Well, I have what I call "Hawaiian" ... canadian bacon and pineapple.
 
@Pᴀᴜʟsᴛᴇʀ2 I'm like you, but I don't like it when they put pineapple as a topping
 
my favourite: "a la romana" -> anchovies and capers
 
Oh, I love cooked pineapple.
 
It's like how they use mango to make curry in some parts of India
 
I do not like fish on my pizza ... I'll give you that one.
 
10:07 PM
I'm a huge seafood fan
 
Oh, I love seafood ... just not on my pizza.
To me, fish doesn't belong on pizza ... but that's just me.
 
Same here, I like seafood
 
Fish also does not belong in tacos ... my wife disagrees with me.
I love most every type of seafood I've ever tried.
 
I neither like fish on my pizza, only exception: anchovies
It gives this fine salty taste
 
You know what's amusing... I came on here to answer Fred Wilson's lambda control question. Instead, I answered questions about cat scratches and bearing caps
 
10:13 PM
When I was reading the answer I was convinced that it was you to be the author
mixture control, bosch automotive handbook -> Zaid
 
Fred's both a real mechanic and mechanical engineer
 
10:25 PM
I just looked: He has written some fine answers
 
0
A: Is the after catalyst oxygen sensor used for engine mixture control?

ZaidTwo-sensor lambda control is actually quite useful I'll summarize what the Bosch Automotive Handbook, 8th edition, says: the upstream lambda sensor is heavily stressed by high temperatures and untreated exhaust gas, which impacts sensor accuracy as voltage readings can shift due to changing ex...

Now I can sleep peacefully
 
@Zaid Same for me, I need some sleep
 
@Zaid - Good write-up
Night guys. Hope you sleep fitfully.
 
G'night
 
10:33 PM
Night
 

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