Messages

771

General Mach Discussion / Re: mach3 command line parameters

« on: November 12, 2016, 07:58:56 AM »

my question is, what other "parameters" are there?
is there somewhere i can find a "list" of them?

I have started a document to address your question to be inclusive of what has been posted over time on parameters.

That said,

I can create a thread so others can review it and comment and after updating  put it into Members Doc's.

RICH

772

General Mach Discussion / Re: New cnc machine running but....

« on: November 12, 2016, 07:44:17 AM »

wes709,

I would suggest you do some reading before you buy any piece of Chinese junk
problematic unsupported drive. Others may have a different opinion on them!

Go to the Gecko site and read the support info:
http://www.geckodrive.com/support.html/

Maybe consider this drive:
http://www.geckodrive.com/geckodrive-step-motor-drives/g540.html

Till then,

RICH

773

General Mach Discussion / Re: third axis for lathe

« on: November 08, 2016, 08:58:25 AM »

do any of you have children who know everything

A little off subject but some reflections:

You created them......What where you expecting?

Now you know where the expression "What have we done" cames from.

Parental education never stops. Experiences are all similar only it's just a matter of intensity and repeatition.

Patience....... most know everthing but as they age just can't seem to recall a lot of it.

Look up into the sky and ask " I know your testing me, good grief,
can't it be someting easy?.

Took all that time to make something just the way you wanted and now you don't recognize it anymore.

Stress reliever......Sit on your throne, it's simple things that
provide relief.

 
RICH

774

General Mach Discussion / Re: Newbie I mean really Newbie

« on: November 05, 2016, 08:32:28 PM »

Well the 500 limit is not true for everything and there are other things that are affected.
Mach is liberal on trying out the software.
So don't think in terms of limiting your code, either you want to use it or not that is the question only you can answer.

RICH

775

General Mach Discussion / Re: third axis for lathe

« on: November 05, 2016, 06:25:05 AM »

Fred,
Here is the link. You'll also need to change  any button associated with A  to Y  also. 

http://www.machsupport.com/forum/index.php/topic,13548.msg88932.html#msg88932

RICH

776

General Mach Discussion / Re: third axis for lathe

« on: November 04, 2016, 09:06:06 PM »

You may want to consider the  lathe set done by Phil....do  search as it has an A axis  which you could change A to Y and code accordingly.

RICH

777

General Mach Discussion / Re: Backlash...

« on: November 03, 2016, 07:14:57 AM »

Stirling,
You can't leave, one need only  hit the top of the box and you will come popping up.     

RICH

778

General Mach Discussion / Re: Backlash...

« on: November 03, 2016, 07:04:13 AM »

FWIW,
Backlash becomes a killer when the size of the engraving / machining is real small.
A good "size test" would be to do a simple  letter  like "E".  
Tool tip radius comes into play, so for the "E" a depth of say .002" with width of machined line .003" the smallest overall size would be
.015" ( using high speed spindle and slow feed).

Tool breakage with small end mills becomes a problem and BC doesn't fix it.

I built  a machine just for engraving.
http://www.machsupport.com/forum/index.php/topic,6904.msg45266.html#msg45266

Most will not go to that extreme in size.
http://www.machsupport.com/forum/index.php/topic,13398.msg87957.html#msg87957

RICH

779

General Mach Discussion / Re: Backlash...

« on: November 01, 2016, 09:18:08 AM »

Hmm....see what happens with repetitive short moves back and forth.
Would think it's the equivalent  of beating the poop out of the machine!


Similar having a  car stuck and your constantly going from forward to reverse with the pedal to the floor to rock it.
RICH

780

General Mach Discussion / Re: Backlash...

« on: November 01, 2016, 09:03:16 AM »

Thanks for the link. Watched the video.

My 50-50-50 rule is a "suggested starting point" for settings and one needs to adjust based on the machine and program settings.

Note that BC is implemented at change in axis direction thus the Gcoding comes into play. Motor tuning values define the rate of possible axis motion and are set by the user....and hopefully the settings allow for reliable / repeatable operation. So BC values
could be at 100% and some small time value.
 
Note also that in the video he adjusts BC to get a more perfect circle. What would happen if another circle with a larger diameter ( ie; 10x) was done in at different axis position? There will be a change in cut diameter tolerance. Just a matter of degree....


A few comments on backlash.
 
The first step is to know how much you have if your going to use BC to remove it. Backlash is directly related to axis / controlled point repeatabilty.

Each component of the axis can have backlash and each adds to the total. The total backlash may not apply over the complete travel of the axis. So the backlash value can vary depending on where and how it was measured.It's all a matter of degree of non-movement and what is causing it and additionaly where it is happening.

Any component of the axis is not perfect in it's motion.
An example is the thrust bearing you just replaced. You can only preload so much and must leave some play or have a motor capable of turning the screw.

RICH