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/diy/ - Do It Yourself


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Anons, I've got a CNC machinist interview coming up tomorrow.
My only experience with CNC machining was briefly working in a family friend's shop, not for money, but just to help out, and running g-code with a 3D printer.
I know a little bit of CAD, and I know my way around manual lathes / mills.

What do I wear, anons?
Should I brush up on anything to make it seem like I know what I'm doing?
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>>2413173
Bring one of these, show them your endurance of your index finger with how fast and how long you can press the green button.
Seeing how you can speak english (not even a requirement) and can push the button, im sure youll be hired right away!
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>>2413177
kek
Thanks for the chuckle, anon.
Is it really a retard job?

The requirements seemed really autistic for all the other CNC positions.
>5+ years of CNC machining and programming experience
>CAD experience is a must
>bunch of other gobbledygook
>AND a minimum of a relevant diploma necessary
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>>2413185
There are two types of cnc machinist jobs
The ones where you need a degree and CAD experience, and the one where they hire illegal immigrants
There is no in between

Whether there is a path up the ladder into that higher tier job vs just a button pusher purgatory depends on the shop.

Shops need bodies, so just don’t be a dingbat in the interview and you’re hired. seriously
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>>2413190
Cheers to the advice.
I'm in Ontario, and it's a rural-Ontarian shop, staffed by Canadians, owned by Canadians.
They also seem to do a lot of custom manufacturing shit (isn't all CNC, of course, but still) - for agricultural equipment and the like.
It's a pretty massive shop, almost a full-sized factory from what I saw, million-dollar-machines by the looks of it.

I'll just try to be competent.
Got any advice on what to wear?
I feel like a suit is for a dingus, just clean jeans and a polo?
Or jeans and a shirt?
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>>2413192
Shirt and slacks, dress like your meeting your gf parents for the first time plus best unscuffed yet functional work boots
Don't sweat it lad, if you are any way competent they'll take you
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>>2413190
not op but how do I slide into the first category without the experience they want? I have 3 years experience in a different field that sometimes involves manual machining and a half finished community college degree in machining.
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>>2413251
Appreciate it, fren.
Hopefully I'll get it - I was a NEET for 2 years, and I feel bad for mooching off my family.
Want to finally start paying for myself, and buying more silver / gold.

Am studying mechanical engineering right now, and was hoping to start a career in something relevant - especially because I fucking hate programming and "software development" (original field of study, left it after 3 months.)
But, sorry for the blog - basically, I'll do my best to be reasonable and professional, and sprinkle in a bit of charm without acting stupid / cracking jokes every second during the interview.
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>>2413190
I've been on both sides of the CNC coin. Worked two years as a button pusher and when I started off I still thought it was basically magic happening inside the machines. I worked the night shift and "ran" a 5 axis that was programmed by the morning shift guy to basically run by itself 24/7. Never even got to do setups, just measured, polished, and washed parts, tweaked the offsets as dimensions drifted, and replaced tools when they wore out. Often had orders in the 1000+ quantity range.
Then that shop closed and I was hired by a desperate shop owner to be his sole CNC machinist in a more agriculturally focused industry, where different shit comes through the door every day and I had to learn how to constantly wing it and to get ready for surprises, with limited equipment and much of it falling apart. Actually it's a rare occasion that I even get a print or tolerances to work with. Usually just have to figure it out with trial and error. Never a dull moment.
>>2413173
It probably doesn't matter what you wear so long as you don't come off as a complete retard. People really need workers bad. Even if you don't exactly fit the bill you may end up limping the company along to the best of your abilities, better than nothing so long as you don't make a habit of breaking expensive things.
But everybody wears Carhartt so that's probably a safe bet.
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>>2413190
Not true at all. There's the redneck equivalent of the illegal immigrant shop that's always 50/50 functioning alcoholics and people under the age of 21
>>
why are there sparks coming from the masonry drill bit and why is said masonry bit being held in a mirring machine?
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It got moved by a week, anons.
:(
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>>2413185
>5+ years of CNC machining and programming experience
>CAD experience is a must
>bunch of other gobbledygook
>AND a minimum of a relevant diploma necessary

So based on this, you are underqualified.
Can you read GD&T? Can you take an engineering print from 2D wireframe, create a 3D model in something like MasterCAM? Then select correct tooling, feeds, speeds, for that material? Then program toolpaths around that solid model ? Once you have this done can you create precision workholding devices from scratch to hold the stock? Then can you apply all those programs to the real world and create it from raw material? When you say you know youre way around manual machine tools, can you use dial indicators, test indicators, calipers, micrometers, height gauges etc for quality assurance? These are just a few things you will need to be EXTREMELY proficient to handle the job you described.

BUT there are retarded shops that call an Operator job (button pusher) a Machinist position. So go and bullshit your way through it and see where you end up. GL
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>>2414854
They are basically asking for someone who has 10k hours in this field. And no telling them you made some plastic widgets on a 3D printer will not impress them
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>>2414120
why would you even use CNC equipment for oneoffs and repair work?
My job has us on bridgeports and engine lathes for that shit
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>>2414854
This. If you know manual machining let them know you are capable of more than loading a vise and pressing the green button. I started my current job straight out of trade school as the one welder at a small fabrication shop and knew absolutely nothing about machining. Through interest and necessity I learned the basics of manual machining just enough to program, maintain, run CNC machines. After two years I think I'm finally on the upswing of the Dunning Kruger effect, where I'm not constantly terrified about crashing a machine. If you're new to CNC machining, before running any program; back the rapid and feed rate override dials back to one click above zero and adjust them to "drive it" through the program until you know it's going to work. Also when you zero the machine or set tool diameters in mastercam they can be off. So if you have a part that specifies a hole to be +0.500-0.503. Drill it with a 3/8 and drop a 1/4 end mill into the hole to open it up. Never assume the cutter in exactly .250 even if the LIDAR tool setter says it is. Back the size of your cutter off to .245 and creep up on your target number without removing it from the vise. If you're removing and loading vises always make sure everything is completely clean and always slide them along the deck. If you remove a vise from the machine and set it on a steel chip you could create a divot, which will cause the vise to pivot the next time you try to tighten it up on the deck throwing off your zero. You should always clean, run a fine stone, then oil the bottom of the vise and the deck of the machine before installing any vises, angle plates, tie downs or other fixtures.
>What do I wear, anons?
If you're competent no one cares. I work at a very small shop and the last interview we had was an engineering student wearing straight leg jeans, redwing boots, wrangler flannel shirt, beard. He looked the part but couldn't read a tap measure, since his level of experience was artificial.
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>>2414900
>why would you even use CNC equipment for oneoffs and repair work?
Because there is a market for it.
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>>2414854
Well, here's what I know from making 3D widgets and manual machining:
>3D modelling in MasterCAM
Check.
>selecting tooling for materials / feeds / speeds
Check.
>create precision workholding devices
Built micro-scale steam engines on manual lathes, and on a CNC as well, check.
>dial indicators, calipers, micrometers, height gauges
Check.

But, I don't really know the wireframe stuff, although I've made plenty of blueprints myself, if that's what you're asking - yes, I know how to read technical drawings, as long as it is for the part or at least section of the complete mechanism - I couldn't model a 747 from a print.

I also don't know what test indicators are.
But, the rest, I do know.
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>>2414854
Sorry if I got a bit upset in my reply, anon, I suppose I just get a little frustrated with technical terms.
But, I appreciate the advice and/or reality check.

I'll still try, but I didn't really lie in my resume, so they know what they're getting.

My experience in machining / metalwork / fabrication is a little bit unusual, because it's from 80 years ago.
As I mentioned, I learned manual machining building steam engines, welding / painting / fabrication / refurbishing from repairing old 1-cylinder hit and miss engines, and all my electrical skills from ancient electromechanical crap - think old pinball machines.

So, I have about 200 hours of experience on a manual lathe, and another 150 on a manual mill, and about 1,000 hours of experience total, but it's all with technology from 70 years ago, minimum.
The lathe alone was from 1955.

The only modern piece of equipment was the CNC, which, for some reason, was bought for more than the entire shop was worth - we used it for automating production of small pieces like connecting rods and cylinder heads.

But, I never learned technical jargon, and we knew that the "measuring thingy" was the caliper, and "the gauge" was a dial indicator.
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>>2415157
this. you'd use it to tram in a vise on a manual mill
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>>2415262
You mean checking the vise for squareness?
We usually just used the dial indicator for that, set up in a little clamp that was on the machine.
Thanks for explaining though, anon.
Some places seem to say you can just use a dial indicator, pretty sure that's what we did.
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>>2415157
Wireframe is part of 3D modelling so you should know that

how about the CAM side of mastercam? 4, 5 axis toolpaths? backplot verification? machine simulation? multi axis linking? you need to have experience in these things if you dont want to crash a million dollar piece of equipment. streamingteacher.com if you need to brush up

modern prints use GD&T, far different and more complex than traditional prints so you'll need to know this as well

then you'll need all the CNC set up knowledge, which is generally a 1 year course at a community college, and theres really no substitute. can you read G and M code ? probing experience? macro programming?
look up Haas cnc mill programming workbook PDF and go through it. its about 150 pages and its about 20% of what you need to know regarding gcode

N1 G20

N2 G90 G00 G54 X0 Y0 S900 M03

N3 G43 Z1.0 H01 M08

N4 G99 G81 R0.1 Z-0.6 P250 F12.0 L0

N5 G65 P7051 X3.0 Y6.5 D4.5 H6 A5.0 S1

N6 G80 Z10.0 M09

N7 G28 Z10.0 M05

N8 M01

...

%
O7051

#10 = #4003

IF [#7 LE 0] GOTO 9101

IF [#11 NE FUP[#11]] GOTO 9102

IF [#11 LE 0] GOTO 9103

IF [#19 EQ #0] THEN #19 = 1

IF [#19 NE FUP[#19]] GOTO 9102

IF [#19 LT 1] GOTO 9104

IF [#19 GT #11] GOTO 9105

#7 = #7//2

WHILE [#19 LE #11] DO1

#30 = [#19 - 1] * 360 / #11 + #1

X[COS[#30] * #7 + #24] Y[SIN[#30] * #7 + #25]

#19 = #19 + 1

END1

GOTO 9999

N9101 #3000=101

N9102 #3000=102

N9103 #3000=103

N9104 #3000=104

N9105 #3000=105

N9999 G#10

M99

%

If they want you to troubleshoot this macro, could you do that?

Knowing technical jargon will show your level of expertise
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>>2415298
But, anon, it's not a programming position.
The responsibilities didn't include any drafting or any programming or modelling.

I've got actual programming experience (Assembly, Java, C++, C), so if I familiarize myself with the syntax, I could probably sort it out rather quickly.

I mean, it makes sense looking at it - N is just the lines, the G is circular motion I think?
All the letters are simply parameters or cartesian offsets.

The rest is just some if / while looping statements. Now, I cannot say what they do, because I have no idea what the fuck the numbers are, but to me it looks like instead of stepping each position, they are the result of whatever the function programmed is - "increment 19 by +1 and return" and then just checking it all over again - "if x then step to y" etc.
In fact, I might be retarded, but from looking at it for a few seconds, I think it's just doing a spiral, isn't it?
The Sin and Cos, as well as the incrementing.
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>>2415321
>The requirements seemed really autistic for all the other CNC positions.
>>5+ years of CNC machining and programming experience
>>CAD experience is a must
>>bunch of other gobbledygook
>>AND a minimum of a relevant diploma necessary

>>5+ years of CNC machining and programming experience

>> programming

they are expecting you to have YEARS of experience programming these machines at a PROFESSIONAL level anon, you can't just guess. you need to KNOW these things
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>>2415328
Guess I'll starve then, because I ain't working for McDickalds, and schooling is a joke because Canada is hyperinflating, and I can't take on debt.
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>>2415635
Still go and talk to them, be honest and upfront about your experience. Some HR roastie probably saw you have experience in machining and decided to push you through, but you won't last at the listed position.
So ask for an operator position, (button pusher), and ask if they are willing to train you on set-up. Give them 3 months to keep that promise if they say they will. keep your eyes open and learn everything you can, find a non-retarded old timer who will ramble about machines (they will sound like they are senile but if you pay attention you will learn alot) and ask for as much training as possible (come in early/stay late a once/twice a week) and you can work your way up if they are willing to train and if you are willing to put in the time. Depends if they are a good facility or not.

I still say go for it, because as you said the other options are quite dogshit. If theres a good technical school near you you can take courses in machine tool technology and that will bolster your resume in order to skip the nigger tier button pushing shit. gl anon
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>>2415649
Thanks for the advice, friend.
I'll definitely go through with it - sorry if I got a bit butthurt - I just feel like everyone's always out to demoralize anyone that they can, and I'm about a year from homelessness if I don't get my shit together quick. I've got family, and am on good terms, but there is no way in hell that I am going to continue mooching off of them when they're having financial problems of their own.

As you agreed - the alternatives are fucking dogshit - the only things available here are farm labor and McDonald's, oh, and some diversity hire shit about "inclusivity management" but I haven't got the mandatory 10 years of experience sucking penis to apply.

I made sure to let them know that I haven't got much experience at all, but I'm not stupid and willing to learn on the fly - the HR lady was quite nice, and the boss man himself reached out to me and said he'd like to have a chat, so it seems like he looked at my resume too.
I explicitly said that I've only got 3D printer "CNC" experience, and only setup / button pushing on an actual CNC machine, but they were pretty okay with it by the looks of it.
Given that they still want to talk, I'm hoping it'll be for a training-type position.

I honestly just want somewhere that I can work 30 - 35 hours a week (boss man said it will likely be part time anyways, which is great for me), and make money while I work on my mechanical engineering degree / businesses.
And who knows, I might as well make this my career in the meantime.

Unfortunately no good schools, and I'm grinding out courses towards a Mech Eng degree online anyways (only thing I can afford without debt).
I'd honestly be happy starting with even button-pushing, and I'd prefer sitting around pressing buttons for a year, as it'll get me a chance to observe and study the work environment, pick stuff up as you said.
I'll make sure to report back with how the interview went.

You have yourself a good one in the meantime, anon.
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>>2413185
Where's this job at? I'm going to steal it out from under you.
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The elitism on display from people who make less than $70k/year is always good for a laugh
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>>2416522
Not telling you until after my interview, anon.
:^)

>>2416525
Just want a comfy job, fren.
I'm waiting to get my Mech.Eng. degree to start a business.
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>>2416525
Not uncommon to make upwards of 6 figures with a few years experience... there was plently of these listings all over US
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>>2414854
I had a class in GD&T and still don't really get it lmao.
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>>2416525
Your post sounds like cope to me.
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Interview T minus 45 minutes.
Printing out my resume, got workboots and glasses and polo.
Cheers, anons.
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Moved by another day.
:(
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Didn't get the job.
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>>2418360
The fact that they couldnt keep a schedule and moved you more than once is a blessing in disguise
What kind of shop cant keep its commitments?
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>>2418364
Thanks, fren, that helps a little.
No other jobs in my area right now other than McPenis that I qualify for.
I'm gonna give up on the job search for a month or so, going to start my business now I suppose.
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>>2418370
>I'm gonna give up on the job search for a month or so

Last time I did that, 9/11 happened, and since there were no jobs to be had, I went back to school. Pretty sure 9/11 wasn't my fault. The universe hates me, but probably not that much. Anyway, maybe take it a bit easier, but don't give up. You'll get a good gig at some point fren.
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>>2418460
I do appreciate that, fren.
I definitely do hope something works out.
I actually got an idea for a patent, so I might use this month to get my patent (nothing major) set up, and maybe pitch to a company.

Maybe it'll be my break.
But I'm definitely not going to fall into nihilism / demoralization. Although, I'm a little cynical regarding waging now, might want my own business more than anything now.

I will try another gig if this doesn't work out by next month though!
I just hate being a fucking leech on my family.
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>>2418502
>I actually got an idea for a patent,

Learn about why "patent applied for" is useful while patents are often expensive and useless. Do thy homework.
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>>2418504
Oh, of course, anon.
I just gotta get the application in - the minute it's "pending" you can bet I'm going to pitch it everywhere that I can.

I don't actually care that much about the patent (though it'd be fun to have it in the records), more just to be able to slap "PATENT PENDING" on it.



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