Would you answer this queation correctly?

[kevin]

I'am going for my Red Seal cabinet making exam.I was doing sample questions its hard because of how long I've been out of school
But I think I had the right anwer but it was wrong there a few questions

I would be curois what Gary or Brady would pick anybody else is welcomed the more feedback the better

Thanks

8. Which steps are necessary when doing a large production run on CNC equipment?
A. Run an anti-virus check and machine materials.
B. Regularly check dimensions of finished products and make adjustments.
C. Double check the X coordinate and recalibrate the zero stops.
D. Back up computer files and adjust the speed potentiometer.

[dlcw]

Not being a large production run type of shop my best guess would be 'B'. This seems logical.

When I run jobs, maybe 10 to 30 sheets, I am checking dimensions of parts along with fits of joinery regularly as I go along.

[michael_schwartz]

I would go with B for sure.

I hope they don't want you to run antivirus software....... From the wording, why would you do this, and then machine the material? This leaves me to believe that this would be incorrect. Then again maybe it is. Who knows.

C doesn't sound like a complete question. I would say no.

D. My first thought would be whether they want you to reverse the polarity of the flux capacitor after checking the speed potentiometer :D However a google search reveals that this term might have something to do the speed controllers for some spindles. There is never anything wrong with backup. I would be tempted to say no to this one, but it may be correct.

[bleeth]

In Bot speak C could mean run your xy and z zeroing routines before cutting. That would be the good answer.

[steve_g]

My answer is "E"... All the above.

SG

[SomeSailor]

B would be my answer.

[garyc]

Large production runs... wear bits...change sizes.

I would answer "B"

Most big iron machines have tool diameter compensation built into the controller.

[harryball]

Whatever they think the correct answer is, is irrelevant to me, the best answer is B. If they said something else, they are wrong. :D

To answer the question I don't have to guess... I know what I do. When I run for an entire day I spend time checking the output for dimension, quality of cut, fit etc... I don't care about virus scanning and so what if my origin drifts slightly? It won't matter so long as it is between sheets and even if it does shift too much, I'll notice something is wrong because the fit or dimensions will suffer. I also rarely stop in the middle of a production run to backup my computer or adjust settings.

In short, what counts is what comes off the machine, when it is wrong is when it's time to do something about it.

Of course the scope of their question is limited to the "best" answer. While the machine is running there are tons of things to do like listen, smell, watch etc... If registration is very important, like a 2 sided job, then the origin and zeros will be checked more often.


/RB

[kevin]

I answer wrong b is the right answer ,I thought back up was important if computer crashes

I'll have to study.

Thanks

[knight_toolworks]

backup is. what happens if you are in the middle of a project and your drawing computer crashes and you have not saved the file?? Now I try to backup before I start cutting (small jobs and backup when I am working one something larger while working on the file. dropbox makes sure it is backed up and versioned right away. plus battery backup on both computers.

[steve_g]

In defense of my wrong answer...

The question said "when doing a large run..." had it said "While" I may have chosen differently.

A. Even a barebones machine needs some type of current anti-virus software... especially if you are carrying files around on a thumb drive!

B. Checking dimensions is what we do.

C. Double check Zeroing... recently a sample part checked out good... I needed two parts so I re-zeroed my Y axis 4" over and re-ran the same file. Oops, I forgot to re-zero Y before the next job.

D. Backup files... I hope you have a never fail method of consistently doing this, or it's not getting done! The part about the speed potentiometer I assumed was determining proper chip load when determining cutting paths.

With my limited knowledge... I figured they were all important!

SG