Messages

781

General Mach Discussion / Re: Backlash...

« on: November 01, 2016, 06:54:54 AM »

Dave,
Can you post a link to one or two of the videos so I can see what they are doing?

RICH

782

General Mach Discussion / Re: Backlash...

« on: October 31, 2016, 08:12:33 PM »

Never used servos, only steppers with BC a long, long time ago.
BC at that time never worked with the SS and would think an external controller would need to support BC.

My experience is expressed in  my link posted in the other reply I made.
Reread the info and try starting very slowly and observe the motion.
The faster BC is implemented  you will get a knock / thump sound as the slack in the axis is taken up very rapidly. 

Sorry can't be of much more help,

RICH

783

General Mach Discussion / Re: Coordinate Spaces - a Guide

« on: October 30, 2016, 10:48:25 AM »

Something you may want to use  /  modify for your next update.

Hopefully captured your intent.

I would strongly suggest you genericaly explain the concept.

Consider:
- Default setup on startup can change any description.
  So define you starting basis of the write up so other stuff
  satisfies some basis, if you don't a reader may constantly
  struggle to relate. OR start from manual to some level of setup    

  automation.

- You have workspace...is there a fixture space?
  Workpace can be inclusive of fixtures, but if multiple fixtures
  are used they could be individual workspaces ie; G54 on startup, the  

  G5x for others, in fact G54 variables can be "0".

  Now G5x is global and G52 is local. G52 is relative to the CURRENT
  G5? workspace offset. It is usualy used as a temporary controlled  
  point offset in programming. SO be carefull in examples.

  G5x WORK offsets replaced the legacy code of G92, but as you see in  

  diagnostics there is only a G92 offset.

- BTW, I think I read were MAch parameters were based one of Fanuc's    
   controller.

Just some thoughts,

RICH

784

General Mach Discussion / Re: Coordinate Spaces - a Guide

« on: October 29, 2016, 11:14:08 PM »

is written from the g-code point of view

Because g code is "basic" to any controller.

This needs to be added to what I wrote:
All contollers have commands to control a machine and although
they are rather generic each controller has dilects of G code and even some propriatary ones. The following are basic Mach3 G codes / commands related to Work Offsets.

I tried to capture what is shown in hundreds of pages of the major manufacturing manuals and books.

trying to integrate the two versions, but it is difficult

Just what where does one find coordinate "space" as I don't remember ever seeing that in all the cnc material I studied. Coordinates / planes/ etc. are all mathematical based.Sorry i am just having problems with the "space" terminology......that's why your having trouble integrating maybe.

Keep working at it...it's your write up.

You wouldn't happen to have the sources for the pics you used by any chance

I drew them myself in cad to pictorialy show what was written.

including your write-up as a Part 2 in the doc: 'the view from the g-code side' as it were.

Put it where you want ( not there my friend  ) ..........it's your write up. RICH is fine.

a couple of the diagrams might be useful if you want to make them available.

Diagrams for what? Can you be more specific?


RICH

785

General Mach Discussion / Re: Coordinate Spaces - a Guide

« on: October 29, 2016, 04:56:33 PM »

Are they a more recent version of the MachMill manual?

 
 NO

Are they a more recent version of the MachMill manual?

No, the Mill Manual was written years ago and is as it is.

You shouldn't recognize them since they are written by me and your free to include them in your quide.
Like I said, they would be a concise writeup covering basic's which you could build upon.

RICH

786

General Mach Discussion / Re: Coordinate Spaces - a Guide

« on: October 29, 2016, 10:51:13 AM »

Roger,

Comments in attached.

RICH

787

General Mach Discussion / Re: Coordinate Spaces - a Guide

« on: October 27, 2016, 07:26:33 PM »

I can't find your user guide for your screen set. I think I must be looking in the wrong places. Help please?

You won't find it because I deleted the thread. One of these days it will get posted. 

I was just doing some work on the mill stuff you ya. Rest up........

RICH

788

General Mach Discussion / Re: Bridgeport Knee Mill Conversion?

« on: October 27, 2016, 10:55:30 AM »

Dave,
Here is a link to what I did on my Atlas mill for what it's worth.
http://www.machsupport.com/forum/index.php/topic,7396.msg47306.html#msg47306

I originally wanted to be able to use the quill both manual and CNC driven.  That worked but there was backlash and could not get rid of it and
frankly that just sucks for CNC and backlash compensation leaves something to be desired.

So I redid it such that I could move the quill with almost zero backlash and a good resolution. I still can disconnect the ballscrew nut
and use it manually but frankly haven't done that in years.

There is thread in here about using the knee of the mill...do a search.

BTW, never ends does it! 
RICH

789

General Mach Discussion / Re: EZ-Router Mach 3 Gremlins

« on: October 27, 2016, 10:25:56 AM »

FWIW,
The machine doesn't shake ( lets use the term vibration ) when nothing is turned on. When the motors are turned on the machine may vibrate.
So the machine is sensitive to a range of fundamental frequencies. The machine will vibrate if a fundamental or some harmonic is near the machine  / some part of it  is near it's natural frequency. Should things be just right the machine can go into resonance and that you would surely know.
So there are a mechanical considerations to this and from a machine point of view vibration is being induced by the motor system.

If you accept that  fact then  look at the motor system to eliminate the machines vibration problem.
Curing one axis provides solution for the other axes.

Consider.........
What are the motors doing when just turned on but the controlling software is  not  providing servo control?
What happens when the servos are getting control instructions?

Noise /  EMI can be seen as the  equivalent to receiving software instructions.
Here a link to info on EMI:
http://www.machsupport.com/forum/index.php/topic,25616.0.html

RICH

790

General Mach Discussion / Re: Coordinate Spaces - a Guide

« on: October 27, 2016, 09:42:52 AM »

unable to find a simple and explicit guide to the coordinate spaces.

That is very true. There are "books" written on the subject.Every software manufacturer
has numerous manuals covering the material in different ways and presentation. Mach manuals
cover a lot of ground and forum replies usualy address a particular user problem. Manuals are usualy
written to inform the user about the software from a setup point of view and include the specifics of their commands / software. They are not meant to teach someone how to setup, how to code, and leaveS a "void" on the basis for it all. Frankly it's a difficult subject to "concisely" write about. Chapter 7 in the manual
was an try at it and leaves that void. The Mach Mill Manual took over 6 months to write.

 

how the coordinate spaces work before just using the screen DROS to zero things - but how many do?

Not most users and that is why you are constantly seeing the same variations on a theme for problems.
We have all been there! People don't read any more.....plug and play world, etc, etc.
BUT
Consider basics and terminology not understood, then different levels of automation and it can get
very confusing in short order.
 

More hidden parameters

Notice you have some of them noted.
Parameters ( Variables......) that is a subject in itself and would make for an interesting
write up.
 
You are smart to limit your write up to the Mill.
I use a modified screen set for the Lathe and started writing a user quide for it which over time
has become a manual. It has a section which concisely addresses Coordinate systems and will rewrite
/ modify for the Mill. You might consider using it.

For now,

RICH