Topics

1

General Mach Discussion / Spindle RPM

« on: February 01, 2008, 08:05:57 PM »

I have set up my spindle on my mill to run from 300rpm to 3500rpm with ratio set to 1 as my rpm sensor is reading from the spindle. I have set the Campbell board to give 0.to 5v (as required by my spindle control board) over this range and it seems quite linear as 1750 rpm gives a reading of 2.5 volts. the RPM as read by the index pulse is exactly the same  as shown my tacho. I am using Mach 3 v2.64
The problem is that I can not get the measured speed to match the requested speed. I have use spindle feedback in sync mode checked in spindle setup. I have also tried spindle calibration.
Can anyone advise where I may have gone wrong.

regards
Arthur

2

General Mach Discussion / Mach Turn Problem

« on: January 23, 2008, 06:17:09 AM »

I know that it is more likely to be operator probems as I am new to this. I have just finished converting my Boxford TLC250. It works very well with manual entries and I have also tried some turning wizards with success.
However when I try a simple end facing toolpath generated by mastercam X2 the tool starts at the correct piont but it faces the whole diameter of the stock. I set Z by taking a light cut and zeroing the z axis. I then take a light cut over the diameter, measure the diameter and enter that in thex axis. A printout of the toolpath is below.  Post proc is Fanuc 2 axis slant bed.

(PROGRAM NAME - Test)
(DATE=DD-MM-YY - 22-01-08 TIME=HH:MM - 19:15)
(MCX FILE - Test)
(NC FILE - C:\MCAMX\LATHE\NC\T.NC)
(MATERIAL - ALUMINUM MM - 2024)
G21
(TOOL - 1 OFFSET - 1)
(OD ROUGH RIGHT - 80 DEG.  INSERT - CNMG 12 04 08)
G0 T0101
G97 S500 M03
G0 G54 X37.95 Z0.
Z.52
G98 G1 X-1.6 F30.
G0 Z2.52
X37.95
Z.26
G1 X-1.6
G0 Z2.26
X37.95
Z0.
G1 X-1.6
G0 Z2.
G28 U0. W0. M05
T0100
M30

I also noticed tha the Mach 3 toolpath representation shows a front toolpost while Master cam shows rear toolpost, the lathe has a rear toolpost.
I would be gratefull if anyone can point me in the correct direction to rectify the above.

Regards

Arthur