Messages

51

General Mach Discussion / Re: diameter of indexing disc

« on: October 08, 2007, 11:49:49 AM »

thanks BRIAN,

                    MICK.

52

General Mach Discussion / diameter of indexing disc

« on: October 04, 2007, 02:29:21 PM »

hello to all,
              just a quick question, does the diameter of the disc used for indexing affect the accuracy when threading.
                                                     
                                                                        thanks mick.

53

General Mach Discussion / Re: loosing steps in one direction

« on: August 28, 2007, 10:37:35 AM »

thank you gents,
                       my problem is solved thanks to Ians suggested bob change.

after fitting the new board this morning, i ran x & y axies through 50 cycles each , after which the d.t.i  read .0005 error.

  happiness !                      thanks mick.

54

General Mach Discussion / Re: loosing steps in one direction

« on: August 09, 2007, 04:37:46 AM »

GRAHAM,BRIAN ,
                          thanks for the suggestions ,will have a go.
         
                                                                          regards mick.

55

General Mach Discussion / Re: loosing steps in one direction

« on: August 07, 2007, 10:08:14 AM »

IAN,
     thanks for the info, i have been thinking along those lines.

ordered a set of new chips for this board this morning , but by the sounds of things maybe its money wasted.

                                    regards mick.

56

General Mach Discussion / Re: loosing steps in one direction

« on: August 07, 2007, 08:00:32 AM »

Tony,
      thanks for your input,
                                    mick.

57

General Mach Discussion / Re: loosing steps in one direction

« on: August 07, 2007, 07:57:23 AM »

good morning Graham,
                               have tested as you suggested,and yes the error is 4 times as big.

also ran driver test:
                         cpu 1597
                         pulse per sec 24.136
                         apic  4142
                         shortest  39.5
                         longest   46.6
mach ver 2.2

        regards mick. 

58

General Mach Discussion / Re: loosing steps in one direction

« on: August 06, 2007, 05:24:27 PM »

thanks Graham,

will try that tomorrow .
                                    mick.

59

General Mach Discussion / Re: loosing steps in one direction

« on: August 06, 2007, 02:44:33 PM »

JIMPINDER thanks for replying,

motors are 220ncm ? 1.8deg, drivers set 1600 steps per rev,320 per mm
 
the backlash is all but zero.

the reason i ran so many times is, after 10 cycles from 0-127-0 mm i measured a -.0011" error and wanted to know if it was
accumulating, to me it says that steps are lost in one half of the cycle,

is this correct?

60

General Mach Discussion / loosing steps in one direction

« on: August 06, 2007, 12:43:36 PM »

hello to all,
              i have a small 4 axis mill x@y recentley fitted with 16mm *5mm ball screws and angular contact bearings ,driven by 320oz steppers through a cnc4pc g11 bob and arcuro drivers,after cycling each axis 50 times 0 to 127 to 0 the error is about .150" dti.
no combination of acc @ vel seems to improve on this, gen/config/step pulse(5),dir (5).
drives have been swopped with other motors,tried  sherline mode  but the problem is still there.
                                       thankfull for any suggestions,    mick.