Messages

951

General Mach Discussion / Re: is this stepper big enough?

« on: April 12, 2016, 07:06:05 AM »

fred,
You will find info in Members Doc's on how to calculate steps per unit. There is a spread sheet
which makes it easy. If you have a torque wrench you could test to see how much holding torque is available.


RICH

952

General Mach Discussion / Re: is this stepper big enough?

« on: April 10, 2016, 07:13:33 PM »

Firstly -I have heard that steppers have there most torque when running very slowly?
Is this correct.

The torque is max at the slowest rpm of the stepper and degreases as the rpm increases. So yes, BUT,
you also want to have a decent axis resolution by micro stepping, adding gearing increases delivered torque.
Without any motor model / make you know nothing of that motor. You could mount it such that you turn the shaft and see max generated voltage.
Also can measure resistance, capacitance/ inductance of the windings. All a trade off of speed, torque, axis resolution.

Suggest you go to the Gecko Site as they have a lot of info on steppers to increase your understanding

RICH

BTW, Steppers are rather cheap these days and worth buying new and thus you know what to expect when installed.

953

General Mach Discussion / Re: G53 & G28

« on: April 10, 2016, 07:45:45 AM »

kevin,
Understand.  The gcode for different controllers are similar, but like language there are dialects.
So consult the Mach Manual when reviewing something based on a different controller.

You need to understand machine coordinates, homed / referenced machine, work offsets,
and G90  & G91. G53 works in machine coordinates and G28 works inclusive of work offsets
and distance mode (ie G90 / G91). So defined controller configuration has an affect
on what happens when using G28. May also want to have a look at G30 and G55 commands.

Home can also be the same as Machine zero.

So if one does not understand some of the cnc basics and uses commands ( G53, G28, G30,
G5x, G0, G1) to move the axis...... the axis may not go where the user thought it would.

Note: The controller only knows what it is told and that includes current configuration
      and implements commands as instructed.

So it can be confusing if the basics and the big picture of setup is not understood.

A few command examples:

G53 X0 Y0 Z0 -  Makes a straight traverse run to Machine Zero

G30 - Makes a straight traverse move to machine zero

G28 - G28 without defined axis all axis goes home in the order of Z then all the rest.
 USED with a defined axis ONLY the defined axis goes home via the intermediate point.
 In g28 you can call a single axis to home, in G30 ALL axis go home reguardless and G28/30 in MACH3 is backwards to FANUC.

G0 & G1 used relative to PART
 
G55 G0 Z0 X0 Y0 - Changes  the Fixture / work offset then goes to X0 Y0 Z0 as straight traverse move at rapid speed

When you ask........
  
Can anyone tell me why my Mach3, G53 & G28 are doing the same thing.

I now ask you......
Under what conditions and how G commmand is coded will they work the same?

RICH

954

General Mach Discussion / Re: G53 & G28

« on: April 09, 2016, 06:05:18 PM »

How about just one fix at a time.

The controller is only doing what you told the controller about YOUR machine and what you tell it to do, so, if the x axis is off, then test the X axis.
Before you do that, calibrate the X axis so the steps per unit are  correct. The calibration is done with axis backlash removed before moving the axis
in the same direction. You can use the calibration feature of Mach to do it or calculate the steps per. Now check for backlash, and if there is any, fix the machine, use BC,
or live with it.

In the mean time, have a read about G28 & G53 in Mach's Manual on how the code is interpreted by Mach.

For now,
RICH

955

G-Code, CAD, and CAM discussions / Re: Basic Mill G-Code Techniques / Tutorial Website?

« on: April 06, 2016, 09:49:50 PM »

Have a look in Members Doc's as I think there is a Hoss programing book there.

Frankly the best source would be a book like CNC Programming Handbook by Peter Smid.
It gives you the foundation which you need.

RICH

956

Machscreen Screen Designer / Re: MachScreen releases

« on: April 04, 2016, 06:36:39 AM »

Thanks as always Klaus.
The script function is a nice option and appreciated.

RICH

957

VB and the development of wizards / Re: Macro for extension G-code

« on: March 29, 2016, 07:09:46 PM »

Different software controllers have similar but not exactly the same, some additional codes and some less gcode codes, AND like a language the dillect can be slightly different for commands. Mach is Mach and others are others. So it was done and so it is. That's just the way things are!

RICH

958

General Mach Discussion / Re: Threading reboot

« on: March 29, 2016, 07:03:34 PM »

I am amazed that nothing changed, especially when putting on spindle speed averaging.

Spindle speed average has to do with what is considered am average rpm during a thread pass and is used to refine the next pass, thus  nothing as you thought.

Personally I think it's your sensor, and try 062 as suggested. If it was a slotted disc I would recommend you widen the slot.

My thoughts for they are worth,

RICH

959

General Mach Discussion / Re: Threading reboot

« on: March 26, 2016, 05:20:59 AM »

I take it from your suggestions that you feel this is a Mach3 issue and not a hardware issue?

Not really, just need to be sure the configuration is correct for using  the index and as said, don't know about V 066.

If you turn the spindle by hand does the index light come on, stay on, turn on and off as you slowly rotate the spindle?

RICH

960

General Mach Discussion / Re: Chinese 3040T problem - no motor movement

« on: March 25, 2016, 09:28:40 PM »

Why the heck would they lock the button from inside the box?

HMM.... maybe to keep people who do not read instructions or know what they are doing from hurting themselves.......
                                                                         OR
They like to keep us busy........

Different folks think differently,

RICH