having problem with a part im cutting

[rustamd]

Hi, i'm new user of mach3 my friend purchased old bridgeport that was already retrofitted, with mach on there.

What i'm working on is first project, exhaust flange. I made part in solidworks, exproted dxf, used lazycam to make inside and outside offsets and into the mach3. Below are few pictures to explain what i'm doing and what i'm getting. I have only tried cutting outside chain, and big inside circle. Also attaching dxf and g code that i'm getting from lazycam.

1. What part supposed to look like:




2. How part looks when its cut:

[turmite]

rustamd zip your gcode file and post it and I will run it through my Mach system and see what I get.

Mike

[rustamd]

N10 (File Name = Exhaust clamp on Wednesday, September 19, 2007)
N20 (Default Mill Post)
N30 G91.1
N40 G0 Z1.0000
N50 M3
N60 X1.8430 Y0.3897
N70 Z0.1000
N80 G1 Z0.0000 F60.00
N90 G2 I-0.1969 J0.0000
N100 G0 Z1.0000
N110 X1.8430 Y4.1397
N120 Z0.1000
N130 G1 Z0.0000
N140 G2 I-0.1969 J0.0000
N150 G0
N160 X0.0337 Y2.9549
N170 Z0.1000
N180 G1 Z0.0000 F1.00
N190 X1.0867 Y4.4291 F4.00
N200 G2 X2.2056 Y4.4291 I0.5595 J-0.3996
N210 G1 X3.2585 Y2.9551
N220 G2 Y1.5744 I-0.9664 J-0.6903
N230 G1 X2.2055 Y0.1004
N240 G2 X1.0867 Y0.1004 I-0.5594 J0.3996
N250 G1 X0.0337 Y1.5746
N260 G2 X0.0337 Y2.9549 I0.9663 J0.6902
N270 G0
N280 X2.4587 Y2.2648
N290 Z0.1000
N300 G1 Z0.0000 F1.00
N310 G2 I-0.8125 J0.0000 F4.00
N320 G0 Z0.0000
N330 M5
N340 M30


i'm cutting with 3/8" end mill, if that mattes(thats what lazycam knows also),so my question is, can anyone help me figure out what is my promlem? Thanks

[Switcher]

It plots good with NcPlot.


.

[rustamd]

yea, it looks ok on mach3 toolpath screen, just when i cut test peice in aluminum it didnt come out as nice...

[rustamd]

anyone else has any ideas?

[turmite]

Is this machine stepper or servo? It almost looks like steps lost?????

Mike

[rustamd]

stepper. i dont know what lost steps look like, never had them. as far as i know...

[Mitsui Seiki]

I ran it on "CNC simulator" and it looks good.
I think your machine is missing something.

[tauntdesigns]

I noticed that the first two holes are cut at a F60.00 and the rest of the part at F4.0. What is the material? What RPM? Tool material?

Crash at N160 and N280: Rapid move in the X and Y before the Z is out of the part. (Edit) lines N150 and N270, add Z1.0000 to those lines.

Change Z on line N320 to Z1.0000

It's been along time but, I think I'm seeing that right.

Cheers,
Jack

[stirling]

My guess is that you're losing steps on Y rapids (at least on -ve Y rapids). lower your rapids and see if that sorts it.

EDIT: nice one tauntdesigns - missed that. rustamd - ignore my post

[rustamd]

Machine is only two axis at the moment(i add m06 before each z movement, than adjust quill by hand). Right now i'm just cutting aluminum(to make sure it does it correctly) but after it works it going to be cut in 304 stainless steel with 4 flute HSS end mill.

I was going to cut it at ~900rpm and 1-2ipm.