# Thread: CNC X, Y, and Z orientation

1. ## CNC X, Y, and Z orientation

CNC X, Y, and Z orientation
Hey guys! I'm very new in CNC and confused with these orientation terms and directions. Can anybody help to straight things out?

My "MD" engineer took out the sticker that the machine's company post on the machine for everyone know the orientation of the machine's movements.

1.) "MD" engineer said, "That sticker orientation was drawing wrong, because if you roll a part 90* from where is the operator stand toward to the back wall of the machine, (Away from the machine door) it means "TURN AROUND X." ???

2.) If you want to flip a part from your left hand toward to your right hand, it means "TURN AROUND Y." ???

3.) In the middle of the program, he wrote the instruction saying: "Turn 180-Deg on Z". ???
What should I do? Set the part underneath the table???

How should I turn and where can I set my part to continues with the machine cycle?

-Nitwit

3. ## CNC X, Y, and Z orientation

Originally Posted by ger21
Hi Gerry,

“We” already asked that “MD” engineer but, the more his trying to explain to us, the more people in the shop get more confused. There is only one “shop Rats” in the shop who wouldn’t want to argue with him is agreed and follows his instruction.

Basically, whenever his say “Turn 180*Deg around Y” We flip “on either X direction.”

Every time his say “Turn 180*Deg around X” we just turn “on either Y direction.”

Turn 180-Deg on Z is simply means Flip it upside down.

I wonder, is this the European way of saying thing like that?

Thank you for your replied and suggestions.

4. The way I see it (vertical mill), you either 'flip the part about a horizontal (or vertical) axis' relative to your position looking down onto the part.

This is the more common expression for 'rotate the part about the x-axis (or y-axis)'. On a vertical machine set-up, spinning the job on the table would be rotating about the z-axis (spindle axis).

I've never heard it described that way in UK or NZ. If, for instance, you needed to rotate 90 degrees about an axis everyone needs to know from which end of the axis to look from and which direction (clockwise/counterclockwise) is positive or negative.

I can easily visualise the axes and directions of rotation from the conventional spindle head/operator orientation, but it can get confusing when you move around to the other side of the machine (example: - 'knucklehead' type mill. It makes perfect sense when vertical milling, but as soon as you put it horizontal and move around the back it's a nightmare - the machine in question has scrawls and stickers all over the jog buttons stating things like 'west', 'door' and 'sunset' (that's mine!)).

Why not just draw a picture as part of a job set-up sheet??? Even better, foolproof the procedure with proper fixturing....

DP

• ## Why a drilled hole was 0.02” over size?

rock4xfab, christinandavid , ger21,

Hey guys, sorry for taking too long to respond to you guys, it’s because my PC is going crazy lately.

@Ger21. I asked my “MD” engineer but he “dunt knuw sh…t”. He keeps drawing a picture and trying to prove to everybody that his way is correct the way, but nobody listens to him anymore except the “shop rats”.

@rock4xfab, I totally agreed with you about I can rough anyway in X or Y. I also just found out this “MD” engineer does not know how to use “MC” software the correct way. According to one of my co-workers said “All he knows is to click on the DXF geometry to make a program and post it up without any head line instruction what so ever.” Therefore, the CNC operator must stand in front of the machine to figure out and correct all his mistakes and insert all the instruction head line in before he can run the job.

For instance, I got a job that requires to make a part that is 10”Wide x 8”Tall x 0.500”Deep (aluminum). The job is very simple, it just needs two open slots the size of 0.406” x 1” long (vertical from Y+ to Y- direction) on the left hand side, and about 8 holes drills and tap on the right hand side.

After loading up the program and checking the graph, it looks ready to run, but when I set up the part and push the start button the machine said X and Y out of range, traverse, because it starts 17” away from the part.

Next day, we all ask him what happened. His said he forgot to set the zero co-ordination when he make up the program. Now I understand why he said “No one knows how to do CNC in this world”.

@christinandavid, I agreed with you about “Why not just draw a picture as part of a job set-up sheet??? Even better, foolproof the procedure with proper fixture....”

Better than that, digital now-a-days is so cheap that my previous job has done that already. In the job travelers included all the infos. such as, Tools list. Print out program in case we need to fix it. An instruction how to set up and a copy of picture what and where to set those fixtures.

Today, I have another question for you guys.

If a drilled hole was 0.02” over size it simply because:

A. The nut set inside the tool holder used to stop the drill was removed or set it in-correctly?

B. Someone used a Permanent Marker to mark on that tool holder to make it out of balance?

C. The drill was grinded incorrectly?

D. All of these above.

PS: Let see if my “MD” engineer was right? “MD” is not Manager Department.

• Can't you just jog the machine in all 3 axis to figure it out?

• Originally Posted by Nitwit
rock4xfab, christinandavid , ger21,

If a drilled hole was 0.02” over size it simply because:

A. The nut set inside the tool holder used to stop the drill was removed or set it in-correctly?

B. Someone used a Permanent Marker to mark on that tool holder to make it out of balance?

C. The drill was grinded incorrectly?

D. All of these above.

PS: Let see if my “MD” engineer was right? “MD” is not Manager Department.
If you are talking about 0.020" oversize on diameter, I'd be inclined to say C - either that or you are using the wrong size drill...

DP

• ## Incorrect Reading if the Grind Stone table out of balance?

Originally Posted by christinandavid
If you are talking about 0.020" oversize on diameter, I'd be inclined to say C - either that or you are using the wrong size drill...

DP

Ha ha ha .. U R ....am... right My Friend... But My "MD" said it because someone removed the stop nut inside that holder and reset it incorrect way. That make the holder spins out of balanced.

What kind of Dork...ng he is huh???

Here I have another question for you.

A. The Grind stone table weight a ton. If you set a folding chair next to it, will it throw out the table level?

B. If the table out of level. Let say 15-deg. Will you have incorrect reading from the height gauge sit on that table?

Let see if My "MD" engineer correct this time?

@

• Originally Posted by Walky
Can't you just jog the machine in all 3 axis to figure it out?

Thank you for your comment and responded.

I did it already that why I know my "MD" engineer is just a Dork...ng !

Thanks my friend.

• Originally Posted by Nitwit

Thank you for your comment and responded.

I did it already that why I know my "MD" engineer is just a Dork...ng !

Thanks my friend.
Then jog the machine in front of the "MD" engineer to show him how it's done

Maybe he's one of these "old school" engineers who likes to live by old fashioned conventions regardless of if it fits the situation?. i.e. "we're in the USA so we'll only use the kind of power plugs that are, by some convention from the 70's (or so), used in the USA". I once talked to an old school radio and TV technician and he was convinced LCD screens had a color wheel; It's been a while since I last blind-trusted in someone's capabilities just because of a diploma. Hell, I once had to edit a video for a video edition student because she didn't have a Mac around with her "one and only" editing software, and I'd only edited videos a couple of times on my free time.

But maybe I'm wrong ,it's all a misunderstanding and your engineer is making perfect sense. He's the engineer, after all, and there are a lot of goddamn good engineers out there; I know I've been embarrased by quite a few times after realizing I was wrong and they were right. Go figure...

• Originally Posted by Nitwit

A. The Grind stone table weight a ton. If you set a folding chair next to it, will it throw out the table level?
How heavy is the folding chair?

Originally Posted by Nitwit

B. If the table out of level. Let say 15-deg. Will you have incorrect reading from the height gauge sit on that table?
I can't believe that your table is 15 degrees out! If it were you may have a little difficulty using tall measuring equipment (height gauges/cylindrical squares/slip-gauge build-ups). You definitely wouldn't want to use ball bearings on there...

It shouldn't really make much difference to a nice rigid height gauge if the table is slightly off level. Heck, at my old place they had a big CMM that used to rock forward when the probe moved too close to the front of the table!

The main thing, I suppose, is that the surface of the table (and the height gauge base) must be FLAT. Good luck checking that...measuring a gauge block in different areas of the table may show up any flatness errors. Stone the base of the height gauge if necessary.

DP

PS Just noticed I got X and Y the wrong way around in my first response...d'oh!!!!

• Originally Posted by christinandavid
How heavy is the folding chair?
I just exaggerate with 15-deg on that table. At my previous job, the grind stone table was set on four ball bearing wheels so we can roll it back and fore wherever we need it. However, we have no problem with it at all, if the tall or height gauges sit flat and perpendicular on that table.

My Co-worker said it doesn’t matter how many degree you can till the table. As long as you do not turn it upside down, because how can you hold it up?

<<< How heavy is the folding chair? >>>

That is the whole idea why I post up this question so everyone know how Dork…ng he is .

Thank you for your comment and replied.

• Page 1 of 2 12 Last