Messages

1971

G-Code, CAD, and CAM discussions / Re: Prefix in edgecam

« on: August 07, 2007, 04:53:51 PM »

Use a Fanuc 6 post, it is very close to mach3.

Graham.

1972

General Mach Discussion / Re: loosing steps in one direction

« on: August 07, 2007, 04:24:53 PM »

Hi Mick,

from the test you have done I would say that it is NOT a machine error more a driving error, try a different cable and/or breakout board.

Graham.

1973

General Mach Discussion / Re: HELP pleeeeeese Z axis problem !!!!

« on: August 07, 2007, 03:43:42 AM »

Have you had the Z axis in bits to see if there is a jamming condition, if I remember correctly these machines use plain bush slides, is one contaminated?

Graham.

1974

General Mach Discussion / Re: HELP pleeeeeese Z axis problem !!!!

« on: August 06, 2007, 05:06:06 PM »

Hi,

I think you should halve the velocity and double the acceleration figures for all the axis and let it run a very long program, see if it faults,  it may be right on the limit.

Graham.

1975

General Mach Discussion / Re: loosing steps in one direction

« on: August 06, 2007, 04:48:35 PM »

Hi Mick,

if you reset your drivers to 400 steps/rev and retune mach3 to match, then run your tests again are the errors 4 times greater?

Graham.

1976

G-Code, CAD, and CAM discussions / Re: Prefix in edgecam

« on: August 06, 2007, 04:37:53 PM »

Mach3 uses .TAP extensions.

Graham.

1977

VB and the development of wizards / Re: Ellipse Wizard (based on Aleks Sub-routines)

« on: August 04, 2007, 05:37:50 PM »

The principle is similar but not the same,  the problem with a lathe is the speed the cam has to rotate to allow the tool to cut efficiently.  Then the reaction time for the X axis is down to fractions of a second.

The piston makers have battled this problem for years with CNC lathes, most still use barrel cam control as its much easier. The only company that has ever got it working well is Takisawa Japan, and they protect it with vigour.

Graham.

http://www.takisawa.co.jp/-e/e02_020102_3100s.htm

1978

VB and the development of wizards / Re: Ellipse Wizard (based on Aleks Sub-routines)

« on: August 04, 2007, 03:21:03 PM »

This sounds more like a cylindrical grinding project than turning.

Graham.

1979

G-Code, CAD, and CAM discussions / Re: G41/G42 causing erratic behavior

« on: August 04, 2007, 03:05:00 PM »

Hi,

try the code with this modification.

Graham.

N20 G90 G80 G40
N21 G90.1
N27 G0  X3.1177  Y1.4374 

N280 M1 (Plasma On)
N285 F1.00
N290 G1 G42 P.06 X3.0364  Y1.3561  F100.00
N295 G2  X2.8401  Y1.4374  I2.9551  J1.4374  F50.06
N300 G1  Y2.5208  F100.00
N305 X3.2345

1980

G-Code, CAD, and CAM discussions / Re: New to cnc need help with z

« on: August 04, 2007, 02:53:07 PM »

I think you have your datums set wrong in Rhino or in Feature Cam or both.

When you extruded the block in Rhino you probably entered Z1. and not Z-1. so the datum is on the bottom of the block.

Remember that in most cases all Z axis cutting moves are in a minus direction. E.g. G01 Z-.05 F2.

Graham.