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Messages - RICH

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2121
Have a look at this thread for a modified lathe screen set. I use version #24 of it. Provides for an A axis and no need to keep going back and forth between
screens.

http://www.machsupport.com/forum/index.php/topic,23083.msg161867/topicseen.html#msg161867

RICH

2122
General Mach Discussion / Re: Thumping motors.....
« on: March 10, 2013, 07:34:27 AM »
Attch your xml file that you are using and also information on the system that you bought. For the system, a link would be fine, but note
the system model that you purchased.

RICH

2123
General Mach Discussion / Re: CamBam & lathes?
« on: March 09, 2013, 07:49:35 AM »
Cambam has a plug in for the lathe ,but when i looked at it some time ago, it was mostly experimental and functionality was limited.
You will need to go to the Cambam site and check current status of development.

You could use LazyCam for an outside profile. It dosen't provide for internal work.

I looked and waited for complete lathe software package and and after waiting a number of YEARS just bit the bullet and bought Dolphin.
Just not much out there for the lathe user. I now don't look back and should have done it years before.

RICH



2124
There is a supported thread for BobCad and suggest you post any questions about it there.
I would think that BobCad has improved over time and would be better to use than LC.  
Only using  dxf's for  LC is covered in the manual.
Since you bought BobCad i would suggest you just take the time to learn how to use it.

RICH

2125
General Mach Discussion / Re: Motor Tuning
« on: March 01, 2013, 06:38:22 AM »
Once you gat the steps per unit set based on calculating or using Mach to set them you then measure to confirm that they are correct.
Rather straight forward but then there is usualy some error that one finds .........that sillly few thou. So i will call it the refinement part of finding the steps per unit.
A lot of things come into play when looking, accounting, and thus adjusting for the small inaccuracies.

Chances are that MAch or the software are not the culprits for the inaccuracies. As stated before, Mach gives the commanded instructions for the move and the axis will move as instructed.

It is fruitless to addrress backlash until you have rationalized out the refined steps per unit. You will have backlash, it can't be zero, just a matter of how much.
The refinement of the steps per unit requires that the user be very meticulous in whatever measurement they make and use. Said a different way the simple question is .....What did you measure?

Just a few thoughts that come to mind:
- The indicator is not calibrated or repeatable or not placed well for the measurement
- The ball screw is not linear
-  Coupling has backalsh ( if solid one not a problem but if anything else can affect the reading / repeatabillity)
- Thrust bearing loading ( and this can apply to the stepper motor itself especicialy if directly coupled to the screw)
- Any axis component inaccuracy ie; belt tension, gearing, bearing., etc)
- The motor itself in how well it will microstep.

 All of the above come into the refinement and one needs to know what is causing the error and what if anything can be done about it.
Some are easy and some are a real bear to isolate.

FWIW, back to the side ...........,
RICH






 

 

2126
General Mach Discussion / Re: Motors jerking and loosing zero on low speeds
« on: February 27, 2013, 07:20:12 PM »
Mach demo is limited to 500 lines so appears that you do not have a license.

I would highly recommend that you have a look at the Mach Manual.

Please post info on your controller board you are using.

You need to make sure that the steps per unit are correct and that you have the motor tuning done propperly ie; velocity, accel setting for your machine.


RICH

2127
General Mach Discussion / Re: parts are the wrong size
« on: February 26, 2013, 06:01:22 AM »
Make sure your steps per are correct, then deterine how much backlash you have. The code looks ok.
RICH 

2128
Quote
Work your way up in settings.
  ;D

RICH

2129
Quote
The theory was that as the motor had no load of the axis then it could do that without risk of stalling.

Not sure i agree with that thinking in practice. Backlash can vary depending on the loading produced by the movement.
At least that's what i found when measuring the torque to just move an axis the other direction post BC as compared  to having traveled a distance
in that direction, stop, and then measure to continue in that direction.
ie; the movement is hard in one direction and as such it creates a condition where additional load was applied to say a crappy thrust bearing situation.

FWIW,
RICH

2130
The only way to good flavor of how BC is implemented is to just be very attentive to what is happening.
What one sees becomes a little deceptive when starting at a crawl to implementing at a fast rate.

FROM OTHER REPLIES I have made on the subject:
The Shuttle Wheel Accel is in seconds. How exactly is the" time" applied to the backlash "cycle"? Well I don't really know.
 It's internal to Mach. By observing the difference in how the motor reacts to different settings you will see that it affects the overall time
 it takes for Mach to take up the backlash and at say a value of 5 you will find that over five seconds the handwheel / shaft will turn
 rather slowly. At 0.005 sec its almost instantaneous. In the real slow setting, and say you jog a distance of .1"  you will find there
seems to be almost 3 distinct motor responses in the cycle,....... a small rotation then deceleration...... then backlash taken up
over a time...and then  accel and move to finish the distance.

So to get of flavor of it you need to start slow, observe, listen to see what is happening over an operating range.
Work your way up in settings.

When implemented in rapid movement it can change some of the required torque values just because of the applied BC mechanical movements.
There may be some quirks in MACH on it's implemenation depending on the conditions.....I don't really know .......

I will repeat that if you get rid of the need for BC you'll be a much happy camper in the long run.

RICH

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