Messages

7211

General Mach Discussion / Re: More TURN Threading Questions

« on: August 04, 2008, 11:29:46 PM »

Better than info are results. Attachment at 12 to 15X shows 20-40-80 threads which I just cut.
Will fool around some more and do some measuring.
RICH
 

7212

General Mach Discussion / Re: Progressive Move Error with X and Y

« on: August 04, 2008, 11:16:25 PM »

Carl,
Just keep at it, one thing at a time, and don't get frustarted. Still here on the sidelines for you but my cheering won't help any. How about some humor......just 9000+ more reads of this post and the team can make a record.
RICH

7213

General Mach Discussion / Re: More motor trouble

« on: August 03, 2008, 08:11:31 PM »

Same goes for the steppers as they should not get TOO hot ie; can't hold your hand on them ( in the 125 to 140 deg F range). To much current and they can start acting up.
RICH

7214

General Mach Discussion / Re: Limiting motor acceleration

« on: July 31, 2008, 07:09:16 AM »

Risto,
"how can I get into detail what I can expect to happen in real life with an acceleration mentioned?"

A practical approach would be to look at similar machines by vendors and  individuals and see what they are using.
Make note of the sizes, weights, axis or drive chains, and speeds provided and also what they doing with the machines.
Use your computer program and compare its output to what others are using that works in real life.

I am not familar with servo's or the program you mentioned but have used other programs for steppers. The programs provide general paramters as input guides. So you can be conservative on those parameters. Now they usualy ask for additional loads you expect and only you can provide those. These values  can certainly have an influence on sizing.
So play around with the computer program and see what it tells you. The sizing software may use some inertia guideline ,like a ratio of 10:1 of calculated to actual motor inertia, and often these are general guidelines / rules of thumb which they have found to be applicanle over time. It's just one parameter which provides for motor recomendation.
Like the story on computer use goes, "garbage in garbage out".

-----
Think I,m correct in saying, when going around a circle  Mach uses the lesser of the either axis velocity for the movement. I know that in some other programs this dosn't happen. I also know that my faster computer will give me 
quicker moves around a circle especially at the axis transition points.

Hope this helps
RICH




 






A computer program is a great tool for doing the calc's for a system and usualy provide for motor selction motor options.   

7215

Show"N"Tell ( What you have made with your CNC machine.) / Re: Some new toys for my Taig

« on: July 30, 2008, 09:32:51 PM »

Looking good. Keep posting.
RICH

7216

LazyTurn / Re: LazyTurn

« on: July 30, 2008, 09:17:04 PM »

Looked in my crystal ball and saw something good happening in the near future.
There was Art releasing LazyTurn!

Art, I personally want you to know that your efforts are really apprciated.

RICH

7217

General Mach Discussion / Re: More TURN Threading Questions

« on: July 30, 2008, 08:43:27 PM »

Hi all,
This may be of interest to you or someone in the future. It sums up some testing i did on the lathe today using the diag screen.
RICH

MODIFIED 8/3/08 - ADDED THE FOLLOWING:

The attachment will be modified in the future. If you have been following the Yahoo threads you know that there are discussions on threading
going on. Art informed me that the threading LED should always be on. In my attachment that is not the case, so comment #1 in the attachment is probably wrong, but then, that is what was found during my test. So....just a heads up until additional info is recieved.
RICH

7218

General Mach Discussion / Re: More TURN Threading Questions

« on: July 30, 2008, 06:51:43 AM »

It steps down the front side / tail stock side of the thread. Infeed angle used is 29.5 degrees for a sharp 60 deg pointed thread tool. This may sound dumb, but i assumed that the infeed of the x was  perpendicular to the od of the
piece and not an x-z move . I know some programs do a progrssive cut to the front side of the thread.
Can you clarify?

PS: One of the tests i did was to set depth to .0001" and let it run thru a lot of passes, maybe 60 or more then stop
      the threading, reposition back to original start point, then redo the threading. ( piece not removed from chuck
      and motor left running ). Want to play around with this some and inspect the cutting marks. But I know what will
     be seen can be influenced by a number of things, so need to think more about it.

RICH
     

7219

General Mach Discussion / Re: More TURN Threading Questions

« on: July 29, 2008, 10:09:34 PM »

FROM ART'S POST
"There is an LED on the diags, can you tell me if its staying on during the thread, I fear Mach3 may be killing it as soon
as it starts.. This may be a side effect of the pause removal we fixed earlier on in the year for the pause in drill cycles."

"If it goes out during the pass or rigth away when the pass starts, then we
have found the bug.. if not,  "

------------------------------------------------------------------------------------------------------------------------------------------------------------
I just checked this out / dry run some threading. The trigger will flash green, then threading flashs green , but as soon as the threading move starts the thread light indicator in diags on my machine goes out. This repeats for each cycle when the threading starts.
Using MACH 3 R3.041

Hmmm! Maybe what Taut taut he saw he only taut he saw during his other test!    Tomorrows another day

MODIFIED 7/28/08 PLEASE SEE ANOTHER POST MADE BY ME TODAY  7/28/08.

 :)RICH

7220

General Mach Discussion / Re: More TURN Threading Questions

« on: July 29, 2008, 08:44:21 PM »

Hood,
I havn't done enough tests to put in perspective, yet........    I was doing some 1/4 - 40  & 10-32 x 1/2" long and looks like the first and last 1/3 of the thread are cut well but the mid 1/3 looks like more cutting is occuring one side and it looks like crap when magnified. I didn't check if there is any gain or loss of pitch. Using gummy Al dosn't help so will fool around with brass or some 1012L. I just scanned the Yahoo posts at work so got only a little flavor.

Need to look over the ones RC just posted.

Have a nice Gaertner toolroom microscope so I can measure things accuractely. Same goes for magnified pictures.
If you want me to try some stuff let me know. I'm in no hurry and have time . Will keep track of things and can post how things turn out.

The machine is limited for threading, but in a way, it allows for finding stuff that you would not otherwise come across.

RICH