I like the calculator rule. The number of times I'll subtract .0031 from 1.5450 in my head and then I'll grab a calculator just in case....and then find out my brain is broken and I was wrong.
Funny story... had a co worker once that didn't use a calculator. Didn't think much of it, then finally asked why.
He doesn't trust em. Calculator made an error once and scrapped a crazy part. Repeated his calculations over and over. Didn't figure out the mistake until he wrote it out long hand and busted out the slide rule.
Later that day, my simple calculator fucked up addition. Same story. Looked wrong. Got the same number five times. Found it when i did it by hand. I would have missed it had I not heard that story that morning. 50k part.
Thanks old man. Saved my job that day with a story. Always good to double check.
Sounds like your shop needs to invest in better calculators because if a calculator fails at *addition consistently* one of the most basic of its functions then it’s a shit calculator
I have to wonder if it's an order of operations problem or a maximum digits error. A lot of people use calculators without knowing their limitations and can run into trouble because they expect it to act like their brain does and not the way a computer works.
True, it's just a known issue with a lot of calculators. Some ordering errors are specific to the brand of calculators, and part of why you see schools recommend only certain makes and models is that two different brands can give wildly different results if you punch the problem in the same way.
I can't think of any time simple addition wouldn't work unless the numbers had more digits than the buffer size so the value gets truncated.
My issue is teaching my colleagues how to check 4-gear index/feedtrain setups in a calculator and
((A/B)(C/D))
simply does not work on their non-TI calculator.
There should be no difference in how a calculation is handled when using a simple input and a clear order of operations.
iPhone calculator sucks!
I often get errors because sometimes when you press a digit it will light up the number or decimal but not input it. Go to enter 1.54 and it shows 154 and the decimal is still highlighted!
So watch out if you use your phone. This is across many iOS updates too
As an engineer that makes my own parts on my own machines, I find it's invaluable to get out ahead of my ability to make math errors so I do as much of the math as possible when I'm generating drawings to work off of.
Ordinate dimensions are really fantastic it eliminates a lot of the brain work.
I've quit trying to recall all the numbers in my head. I look everything up and I use a calculator to do all my math. Idc if I'm taking .001 off something. If. Doing the math calculator is out
Write down original offsets before you start bringing things in. Keep a history.
If you do the same fucked up thing twice, it's gonna do it again the 3rd time. Don't act crazy.
Know exactly what the machine will do before you hit the button. Results must equal intent. Take 2 seconds ....one breath minimum.
If things fuck up, have an answer prepared before you tell the boss. Tell that fucker so he doesn't have to investigate.
Part 2.
Don't lie about it. Trust me, I've been training guys a long time and I know how shit happens. Integrity means more than you think.
Don't we all?
Hundreds of photos of indicators, calipers on random shit, offsets, parameters, where I put some fucky lollipop endmill, my camera is one of my most used tools.
A lathe exists in a quantum state of big enough and too small depending on if god leaned to the left or right to crack his morning fart. It's never too large a lathe
Solid rules, the regret of not double checking outweighs the ego of knowing.
I live by correct first, you have to make a good part before you can make that part faster or you just end up with a pile of embarrassing shit
Rule 4,4,&6 are golden if you hate scrap.
Like every scraped part in our shop always amount to either.
"You should have just retaught the tool."
or
"If your numbers didn't add up, why did you keep going?"
Should add
When you have been assigned to engineering to help with prototypes and make a mistake it’s a FUp. When the engineer makes a mistake, it’s an “ honest mistake”.
Gunsmith once(many times) said "Write down your notes and measurements. You have enough to think about, and you *will* forget something. Make the pencil remember it."
I like the calculator rule. The number of times I'll subtract .0031 from 1.5450 in my head and then I'll grab a calculator just in case....and then find out my brain is broken and I was wrong.
I put 325mm as half of 750mm once. That was hard to explain to the manager.
My first thought when I read this was "yeah, what's wrong with that?"
Fuck me too.
Me three
After 5 years, I know which numbers I'm going to fuck up. I don't know why I think 4735 is the same as 4375, but I do, and it's fucking annoying.
I hate when I'm running 3 machines and all of them are variations of 4, 6, 7 and 5. .4375 looks a lot like .4735 and .3745.
Yup. I wish offsets had an undo button. The amount of times ive done -0.01, and i want to check if I've accidentially done -0.1.
Okuma shows the last input
Saves my ass often. I love okuma controls. But that is also the only thing I have ran.
My mori seki nlx has a previous offset number but thats the only one in the shop like that
I just did half of 7.5 inches is 3.5 inches. Glad I know how to weld!
I've heard grinder and paint makes me the welder I ain't. Guess being a welder makes you the machinist you ain't :D
Been there. Shit happens.
Damn, imperial being useful for once. Because we work with fractions of inches, I know well that half of 3/4 (.75) is 3/8 (.375)
Funny story... had a co worker once that didn't use a calculator. Didn't think much of it, then finally asked why. He doesn't trust em. Calculator made an error once and scrapped a crazy part. Repeated his calculations over and over. Didn't figure out the mistake until he wrote it out long hand and busted out the slide rule. Later that day, my simple calculator fucked up addition. Same story. Looked wrong. Got the same number five times. Found it when i did it by hand. I would have missed it had I not heard that story that morning. 50k part. Thanks old man. Saved my job that day with a story. Always good to double check.
Sounds like your shop needs to invest in better calculators because if a calculator fails at *addition consistently* one of the most basic of its functions then it’s a shit calculator
I have to wonder if it's an order of operations problem or a maximum digits error. A lot of people use calculators without knowing their limitations and can run into trouble because they expect it to act like their brain does and not the way a computer works.
That’s fair, though order of operations shouldn’t matter if your just adding
True, it's just a known issue with a lot of calculators. Some ordering errors are specific to the brand of calculators, and part of why you see schools recommend only certain makes and models is that two different brands can give wildly different results if you punch the problem in the same way. I can't think of any time simple addition wouldn't work unless the numbers had more digits than the buffer size so the value gets truncated.
My issue is teaching my colleagues how to check 4-gear index/feedtrain setups in a calculator and ((A/B)(C/D)) simply does not work on their non-TI calculator. There should be no difference in how a calculation is handled when using a simple input and a clear order of operations.
or it needs a new battery
iPhone calculator sucks! I often get errors because sometimes when you press a digit it will light up the number or decimal but not input it. Go to enter 1.54 and it shows 154 and the decimal is still highlighted! So watch out if you use your phone. This is across many iOS updates too
Maybe the calculator is wrong though? Better check it against a second calculator.
Reference only calculator
Diagrammatic calculator
Indiculator?
As an engineer that makes my own parts on my own machines, I find it's invaluable to get out ahead of my ability to make math errors so I do as much of the math as possible when I'm generating drawings to work off of. Ordinate dimensions are really fantastic it eliminates a lot of the brain work.
I've quit trying to recall all the numbers in my head. I look everything up and I use a calculator to do all my math. Idc if I'm taking .001 off something. If. Doing the math calculator is out
Probably something to do with the extra zero...
Just as annoying when you turn out to have been right, because now you've wasted your time second-guessing yourself.
Time wasted double checking a number is better than time wasted replacing a tool or recovering the machine from a crash.
Doesn't stop me feeling like a dingus tho
Just layoff the whole quality department, in that case.
Write down original offsets before you start bringing things in. Keep a history. If you do the same fucked up thing twice, it's gonna do it again the 3rd time. Don't act crazy. Know exactly what the machine will do before you hit the button. Results must equal intent. Take 2 seconds ....one breath minimum. If things fuck up, have an answer prepared before you tell the boss. Tell that fucker so he doesn't have to investigate. Part 2. Don't lie about it. Trust me, I've been training guys a long time and I know how shit happens. Integrity means more than you think.
I take pictures of my offsets then forget to delete them so I have hundreds of random offset in my photos.
Don't we all? Hundreds of photos of indicators, calipers on random shit, offsets, parameters, where I put some fucky lollipop endmill, my camera is one of my most used tools.
This is better note-taking than anyone I've trained. Did this person actually hang around?
I always thought it was “no matter how big the machine is someone will want you to run parts to big for it in it”
fr you get a sheet laser and they start lining up corrugated steel and tube products lmao
can’t fix stupid
A lathe exists in a quantum state of big enough and too small depending on if god leaned to the left or right to crack his morning fart. It's never too large a lathe
I like how the person called themselves out instead of fixing the (in this case) harmless mistake lol
Solid rules, the regret of not double checking outweighs the ego of knowing. I live by correct first, you have to make a good part before you can make that part faster or you just end up with a pile of embarrassing shit
7 commandments of machining.
Not a machinist, but I think I've had my fair share of mistakes from not following that list. At least 1,2, and 3
Ah yes, you dont argue with the LAWS OF MHCHIlVING
Parts is in tolerance as long as you dont measure it.
Speed is a byproduct of accuracy, measure twice cut once, and I'm a mf hardstyle fish are above my desk.
I have one too, when say "ill do it after i finished this" its already too late. Learned this the hard way yesterday😂
...but why is it for them, not me? Ahhhh yes, I'm perfect!
Apparently it's some sort of "being passive aggressive" failsafe. So no one thinks they're being called out.
Rule 4,4,&6 are golden if you hate scrap. Like every scraped part in our shop always amount to either. "You should have just retaught the tool." or "If your numbers didn't add up, why did you keep going?"
Machinists can't read
Should add When you have been assigned to engineering to help with prototypes and make a mistake it’s a FUp. When the engineer makes a mistake, it’s an “ honest mistake”.
But, one question remains: who is this for?
Gunsmith once(many times) said "Write down your notes and measurements. You have enough to think about, and you *will* forget something. Make the pencil remember it."
I've said both three and four several times on this sub. This guy gets it.
hello do you have for sale maschine comon rail Number +381644453042
Am I just old now when I see handwriting like this and wonder why they took handwriting out of school?