Desperate, Stupid Questions

I thought I would try asking this here, because it makes no sense to me and I have no one else to turn to. I'm using a Haas vertical mill version 2 (I don't know the details, but they should not matter).

I made a simple change to a program to speed it up because at first I was concerned with going too deep in one cut. Because it was so slow and the milling calculator had it at feeds of like 40 IPM while I couldn't go above 10 without breaking the mill, I tried to just cut deeper and go in one pass.

When no end mill broke, I thought it was fine. Then I found out it wasn't moving the .013 on the X for the return cut for some reason. I have no idea why. ncviewer.com has the new version looking right, at least.

Can anyone tell me why the second (one .025 cut) version does not move in the x direction? I also have questions about basic surface speed calculations and my tendency to go high on RPM and low on feed, but I hope that is something I can look up and just have not done thoroughly yet.

Here is the two-cut version:
(GROOVES)
( TOOL 8 - 1/16 ENDMILL )
(1ST GROOVE)
(1ST CUT)
G00 G17 G40 G49 G80 G90
T8 M06
G00 G90 G154 P10 X2.829 Y0.1 S4500 M03
G43 H08 Z0.1 M08
G01 G90 Z-0.013 F4.
G01 Y-3.1 F6.
G01 X2.842
G01 Y0.1
M01

( 2ND CUT)
G01 Z-0.025 F4.
G01 Y-3.1 F6.
G01 X2.829
G01 Y0.1
G01 Z0.5 F30.

(2ND GROOVE)
(1ST CUT)
G00 X6.899
G01 Z-0.013 F4.
G01 Y-3.1 F6.
G01 X6.912
G01 Y0.1

(2ND CUT)

G01 Z-0.025 F4.
G01 Y-3.1 F6.
G01 X6.899
G01 Y0.1
G01 Z0.1 F30.
G00 G90 Z0.5
M01

and the updated, one-cut version:

(GROOVES)
( TOOL 8 - 1/16 ENDMILL )
(1ST GROOVE)
G00 G17 G40 G49 G80 G90
T8 M06
G00 G90 G154 P10 X2.829 Y0.1 S4500 M03
G43 H08 Z0.1 M08
G01 G90 Z-0.025 F4.
G01 Y-3.1 F6.
G01 X2.842
G01 Y0.1
G01 Z0.5 F30.
M01

(2ND GROOVE)
G00 X6.899
G01 Z-0.025 F4.
G01 Y-3.1 F6.
G01 X6.912
G01 Y0.1
G01 Z0.1 F30.
G00 G90 Z0.5
M01

Thanks for any help you can give

on the reason that at IPM the end mill breaks at 10 IPM is that your RPM is 4500
i would guess that at a .062 end mill the recommended feed rate is about .0002-.0005 per flute
a 4 flute end mill (.0004 x 4 x 4500 = 7.2 IPM)
on steel i run about 200-300 SFM (3.82 x 250 / .0625 = 15280 RPM and with that .0004x4x15280=24.5 IPM
if using a chip thinning calculator the feed rate would be near 30. IPM depending on what you put for inches per flute/ SFM/step over

for the x axis move
is this the actual program that didn't run correct
does the machine stop or does it make the y axis pass in the wrong place ?

I just went with the suggested numbers in the calculator. It's two flutes, and the suggested SFM was 600 on the low end when you put in the material (aluminum). I won't pretend to know what I'm talking about.

The text is copy-pasted from the two different versions of the program. The machine doesn't alarm-out or anything. It just doesn't seem to move to the second x position in the shorter version. Even though I see it change in the "position" numbers on the screen. I swear I'm close to being correct in pointing out some flaw.

If the display says it's moving, then it's moving. What makes you think it isn't?

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