Messages

51

General Mach Discussion / Probe

« on: November 20, 2011, 05:44:42 AM »

Is there a drawing and description of how to make my own Probe,- for probing x,y&z axises?
(Have the drawings made by Shaun Wainford, but there is no description).

Thanks

Johannes Line

52

G-Code, CAD, and CAM discussions / Re: G76 Threading problem

« on: October 30, 2011, 04:57:42 AM »

RICH

Thanks for your help. I found the Manual and read it - good. I unchecked the "Disable Spindle Relays" and now it WORKS. May have to do some finetuning before I can make a good tread.
Thanks

Johannes

53

G-Code, CAD, and CAM discussions / Re: G76 Threading problem

« on: October 29, 2011, 01:43:50 PM »

Hi RICH

I have the same problem as Hafco, stops at G76. I use a Proximity Sensor and I get a signal when I turn the spindle slow, but when I get up to speed (300 to 1000rpm) the signal is getting unstable. (This prove that the index is working)?
You mention "Threading on the Lathe Write up, Axis test / page 9", where can I find this?
This is my first try withe the Lathe, a Myford converted to CNC as described in Model Engineers Workshop. (I run the lathe spindle manually).
Hope you can help.

Regards
Johannes Line

54

General Mach Discussion / Re: Calibrating in Mach3 lathe?

« on: June 22, 2011, 05:46:42 PM »

Well I had to check before bed.
You are correct it is the radius/diameter thing. When I checked with the correct numbers the Z was moving correct but the X axes was moving only half the distance, the dro in "Programs Coordinates" showed the correct number, but the "Machine Coordinates" showed half the value. This was also the distance the slide had moved. I was working in diam. Changing to radius the movement and the dro was correct!
Is this the way it is suppost to bee?
Thanks Hood, I am sorted out now and can sleep happily to night.

55

General Mach Discussion / Re: Calibrating in Mach3 lathe?

« on: June 22, 2011, 04:47:36 PM »

Thanks Hood

Since I posted the question I found a calculation spreedsheet on this side and it stats that I had a right calc.
See below. (I do not know how to insert a file to this page).
I do not remember how much of but it was quit a bit - something like in the x direction 5mm instead of 10 and in z 30 instad of 10.
Of to bed now,- check it to morrow

Metric               
Required inputs               
   Stepper Motor       Deg/step -    1,8   
          Steps/rev -    200   
   Micro Stepping      Pulse/step -    8   
         Pulse/rev -    1600   
   Gear Reduction      Stepper teeth -    12   
      (Enter zeros for      Lead screw teeth -    24   
      direct drive)      Multiplier -    2   
   Leadscrew      Pitch (mm) -    3,18   
         Thread starts -    1   
         Lead (mm/rev) -    3,18   
   Result      *Steps per mm -    1007,87   
         Resolution (mm/step) -    0,000992   
               
               
    Input:        Result:      
   Feed - mm/min    2500   pulse/sec =   41994,75   
         mm/sec =   41,67   
         stepper rpm =   1574,8   
   Stepper RPM   500   mm/min =   793,75   
         mm/sec =   13,23   
         pulse/sec =   13333,33   
   Pulse/sec   13333,33   stepper rpm =   500   
         mm/min =   793,75   
         mm/sec =   13,23   
   Distance vs.   3200   steps = 3,175 mm      
   Steps   1   mm = 1007,874016 steps      
               

56

General Mach Discussion / Calibrating in Mach3 lathe?

« on: June 22, 2011, 02:59:33 PM »

Hi.
I have just finished retro fitting cnc to my Myford super lathe. Every thing runs OK, but I am unable to calibrate the Z and X axis to bee accurate. I have managed to get them nearly correct by trial and error.
The lathe have imperial screws (8 and10 TPI), but I am working metric. The stepping motor is standard- 200 step pr turn and is micro stepped to 1600 steps. And the reduction from the motor to the screw is 1 to 2. Folloving the instruction in the manual I com up with this numbers: For the Z axes s 1007.874 and the X axis 1259.84252. Putting this number inn the box "Steps per" in the Motor Tuning dialog box do not give me the right movement of the saddle and slide. What am I doing wrong?
In Mach3 Mill there is a utility to set this number automatic, - is there something like this available for Lathe as well?
Hope some can help me out here. please.

Thanks

Johs. Line

57

General Mach Discussion / Re: RPM connection help

« on: February 27, 2010, 02:54:13 PM »

I am back for more help. I have got an opto switch from a friend which I hope I can use, but I do not know how to connect. From the attached data I think pin 1 and 4 is grounded and pin 3 is the output getting 5v through a 10 000 ohm resistor, but where and how is pin 2 connected used? Any help will be appreciated.

58

General Mach Discussion / Re: RPM connection help

« on: February 27, 2010, 09:45:35 AM »

Thanks, works fine now. It was set to 400 and the box below to 0. I entered 2000 and 1.
Now I will try to install a opto switch for a RPM read out, I may bee back.

59

General Mach Discussion / Re: RPM connection help

« on: February 27, 2010, 08:59:53 AM »

Think I have solved the mystery. I followed the wires and found that they do go direct to the board, but Y and STOP was wrongly connected to the board, (from the manufacturer), the no 5 and 51 (5v) was switched.
Now everything runs almost as it should, but when I am "homing" some times it get stuck on the switch other times it comes of as it should - (maybe that's the "wrong" connection from the manufactures).
Thanks Scott for all yours help.

60

General Mach Discussion / Re: RPM connection help

« on: February 27, 2010, 07:07:01 AM »

Neither can I, have checked and checked and......but can`t find anything wrong with my wiring. I have assumed that the wires goes straight from the switches to the board, but now I am not sure.
When I activate the X switch the reed LED on the board at connection 11 lights, when activate Y the LED at 10 lights and when activating STOP 10 lights up as well. So there must bee something going on between STOP and Y.
I have now connected up to original and all works fine, so I have at least not destroyed anything.
(Will have to investigate the run of the wires from switches to the board?)