Hello Guest it is July 17, 2019, 05:20:51 PM

Author Topic: Rotational milling speed?  (Read 7338 times)

0 Members and 1 Guest are viewing this topic.

Rotational milling speed?
« on: December 20, 2006, 04:22:02 PM »
Hello all!

A few months ago I bought a taig mill with a 4th axis. 4-axis milling was a little scary to me so I have spent the past few months mastering two-sided parts. I am now ready to use rotational milling. The issue I am having is that it is VERY slow to cut this way. I am cutting resin rod and its cutting through 1 degree every 10-11 seconds. I am using deskproto to generate my tool paths and all my speed settings there are the same as when I was using normal 3-axis milling.
I read here that I should set my a-axis rotation to the diameter of the part or .0001. Neither of those sped things up at all. I have tried a value in inches and mm just to make sure I wasn't crazy.
When I set my mill and mach3 up I used the settings file and imported everything into mach3 and didn't touch any settings after.
Anyone have any ideas? Are there some other settings I need to poke?

Let me also say that I am an artist. I'm not a dumb artist, but I am an artist. Most of the things I read on these forums seem to be way, WAY over my head so please excuse any vagueness or density on my part.
Thanks much!

JQ

Offline Chaoticone

*
  • *
  •  5,524 5,524
  • Precision Chaos
    • View Profile
Re: Rotational milling speed?
« Reply #1 on: December 20, 2006, 04:46:04 PM »
Hi JQ,
    What are your 4th axis settings in motor tuning? I haven't got to mess with this yet, but hope to one day. Can you post your xml. file for us to look at?

Brett
;D If you could see the things I have in my head, you would be laughing too. ;D

My guard dog is not what you need to worry about!
Re: Rotational milling speed?
« Reply #2 on: December 20, 2006, 04:51:07 PM »
Here's what it says in motor tuning:

Step: 80
Velocity: 1999.8
G's: 0.518
Step/pulse:  11
Dir/pulse: 0


I have these because I wrote them down. I can get the xml file in a bit.
Does any of that help?
Thanks!

JQ

Offline Chaoticone

*
  • *
  •  5,524 5,524
  • Precision Chaos
    • View Profile
Re: Rotational milling speed?
« Reply #3 on: December 20, 2006, 05:05:11 PM »
Step is 80 per degree? I will look at the xml once it is posted.
;D If you could see the things I have in my head, you would be laughing too. ;D

My guard dog is not what you need to worry about!
Re: Rotational milling speed?
« Reply #4 on: December 20, 2006, 05:39:15 PM »
Um. Under step it says 80. That's all I know!
Attempting to attach the xml file.

Thanks!
JQ

Offline Chaoticone

*
  • *
  •  5,524 5,524
  • Precision Chaos
    • View Profile
Re: Rotational milling speed?
« Reply #5 on: December 20, 2006, 06:11:47 PM »
JQ,
   I forgot to ask, what version of Mach are you using? Mach 3 version 2.0.0?? Also, can you post the Gcode file that is running slow for you.
;D If you could see the things I have in my head, you would be laughing too. ;D

My guard dog is not what you need to worry about!
Re: Rotational milling speed?
« Reply #6 on: December 20, 2006, 06:45:17 PM »
2.0.008

Here's a test file.

Thanks!

JQ

Offline Chaoticone

*
  • *
  •  5,524 5,524
  • Precision Chaos
    • View Profile
Re: Rotational milling speed?
« Reply #7 on: December 20, 2006, 07:16:12 PM »
Hi JQ,
    First, I'm running version 2.0.028. This is what I found. Your xml did not have the use diameter for feed rate checked. I ran your test file with this unchecked. The 4th axis was reading 17.1375 at 2:19 minutes into the cycle. With it checked, the 4th axis was reading 19.2750 0:04 into the cycle  ;D . Try to change this setting, close Mach. Open Mach back up and see if the change stayed and try to run your file again.
;D If you could see the things I have in my head, you would be laughing too. ;D

My guard dog is not what you need to worry about!

Offline Graham Waterworth

*
  • *
  •  1,863 1,863
  • Yorkshire Dales, England
    • View Profile
Re: Rotational milling speed?
« Reply #8 on: December 20, 2006, 07:20:55 PM »
Half your problem is your program,  you have a thousand lines where one would do.

Your program moves .0001 in Z for a rotation of 1.1 on the A axis,  you would never see the Z move.

If you are doing 1 rev of the A axis set the Z depth and leave it there until the A is finished,

G00 G90 X0 Y0 Z1.
G01 Z-.6 F5.
A1. F15.
A2.
A3.
A4.
A5.
......Etc
G00 Z1.
M30

Or

G00 G90 X0 Y0 Z1.
G01 Z-.6 F5.
A360. F15.
G00 Z1.
M30

Or are you trying to do something completely different ?

Graham.
Never give up, time will pass, the cloud will clear, the sun will shine once more.
Re: Rotational milling speed?
« Reply #9 on: December 20, 2006, 07:32:52 PM »
Thank you both! I will go try the check box.

Graham:
I don't know anything about g-code. I import a dxf into deskproto and it generates a toolpath. I wouldn't have any idea how to fix any of that! Thanks!

JQ