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Messages - RICH

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1571
Have you considered reading the limitations. There are other things that are limited in the demo.

MACH is not freeware. ;)

RICH

1572
General Mach Discussion / Re: Mach3 Sherline Rotary Magic Number
« on: June 22, 2014, 09:06:08 AM »
Keith,
G01 A80 and you should get the table to turn 80 degrees.

----------------------------------------
There are some general config settings in Mach that you should select.

Rot 360 rollover – if checked the A axis DRO will display from 0 to 360 degrees and then start over at 0. If not checked the A axis DRO will be additive such that 2 revolutions will display as 720 degrees.

Ang Short Rot on G0 – The axis will move in the shortest possible move to a new position. So if at 0 degrees and you jogged  to 359 deg then it would just rotate  -1 degree.

Rotational Soft Limits – if checked will apply software limit switches to the rotary axis.

-----------------------------------------

I have not used my SS in a few years so don't remember if you had to do anything speacial for a rotary.

RICH


1573
Mach4 General Discussion / Re: Mach4 Printer Port Discussions
« on: June 22, 2014, 08:40:20 AM »
ART,
I have limited space........SO when the floor space is used up you add counter space or pull out shelves etc, when they fill up you start adding
drop downs from the ceiling. Now when every thing is filled up, you venture onto your better half's space and test your brides ability to share.



RICH  :) ;) :D ;D

1574
General Mach Discussion / Re: Backlash compensation and jogging
« on: June 22, 2014, 08:33:27 AM »
I don't use my SS anymore and backlash was not available at the time for the SS.
So check out Greg's web site to see current status as Hood mentioned.

-------------------------------------------------------------------------------------------------------------
For the PP backlash worked quite well and below is just a general rule that I recommend. Backlash is implemented anytime there is a
change in direction irrelavant of what your using ie; MPG, MDI, etc.

Frankly you should get rid of backlash in your machine.
 
50% - for the % of max speed ( in backlash flyout window)
Shuttel Accel .050 to start ( in general config)
Debounce Interval 50 to start  ( in general config)

The last two settings have an affect on how the backlash is implemented.


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 distinctmotor 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.

RICH

1575
General Mach Discussion / Re: Mach3 Sherline Rotary Magic Number
« on: June 22, 2014, 08:10:53 AM »
Keith,
 Just some more info for what it's worth as this pertains to resolution.

RESOLUTION

Resolution is just an indication of how fine the A axis system will turn the spindle per step.
Typical stepper is 1.8 degree ( 200 pulses for 1 rev ), most folks micro step ( say  a value of 10 ),
and then it is a matter of how much gear reduction takes place ( lets use 72:1 ).
 
Steps in one revolution= 200 motor pulses X 10 micro steps X  72 = 144000 steps per revolution
Steps in one degree = 144000steps per rev / 360 degrees per rev = 400 steps per degree
Theoretically with just a single pulse sent to the motor you would have the following:
Resolution = 1 / 400 = .0025 degrees   ( which is equal to .15 minutes = 9 seconds ) 
Practically speaking, due to backlash, variances in the gears / belts / motor or whatever, you will not get that kind of movement in one pulse / step.

The following is an example of different combinations:
                                                                                                         + -  RESOLUTION
# MOTOR   MICRO STEPS  GEAR RED  STEPS / DEGREE  DEG  =      MIN   =   SEC
1 200                -NA-                     NONE      .5555                       1.8                 
2 200                10                         NONE       5.555                      0.18         10.8       
3 200                10                         72               400                        0.0025      0.15         9
4 200                10                         135             750                        0.00133    0.08         4.8
5 200                10                         200             1111.1                   0.0009      0.054       3.24

Here are some angular to linear relationships:

ANGLE     PER INCH      PER 3"       PER FOOT         
1 SEC       .000005"        .000014"       .00006"
30 SEC     .00014"          .00044"         .0017"
1 MIN       .00029           .00087"         .0035"

Here is just one aspect of resolution to linear positioning and can be envisioned by the following example.

Lets assume that you are going to index the spindle and drill some holes out 3” from the center of the plate.
So if you were to drill a hole out from the center 3", then index 3 min, and drill another hole,
 the distance you have between the holes would be approx 0.006” for no gear reduction.


RICH

1576
General Mach Discussion / Re: Mach3 Sherline Rotary Magic Number
« on: June 22, 2014, 07:47:07 AM »
Keith,
Sample rotary table calc for 1.8 degree stepper:

- 72 handle turns per one table revolution x 200 stepper pulses per stepper rotation = 14400 pulses  per one table revolution ie; 360 degrees

- 14400 pulses x 1/360 degrees = 40 pulses per degree

If you are micro stepping say 10x.....then  10 x 40 = 400 pulses

With a .9 degree stepper------- 72 x 400 (1/360) = 80 pulses per degree, then adjust for based on your drive step setting

- Note that you should set your max velocity and accel from trial and error so it doesn't skip.

BTW, there is a calculator in Members Docs.

RICH

1577
There are lots of calculators out there, some free, some for a very resonable price, or on-line vendor calculators.
I would suggest you scan the internet to find something that suites you. A lot of the calculators out there take a lot
of factors into consideration and provode a lot of info to the user.

Cleveland actualy published a book on the experimentation they did. Sure wish the person i lent it to would give it back
as it was interesting reading. The reason i mention this is becuse a lot of what you see in calculators are based on the work of
Cleveland and some other associations.

RICH

1578
BUGGALUGS,

Link to info on end mill speeds and feeds. You can calculate or consult the charts.

http://www.machsupport.com/forum/index.php/topic,20045.msg138970.html#msg138970

RICH

1579
Show"N"Tell ( Your Machines) / Re: CNC CONVERSION - 6" ATLAS LATHE
« on: June 16, 2014, 05:15:49 PM »
Bob,
Yes Mach can do multipass threading. I can also do other kinds of threading. Have a look at Threading on The Lathe which you will find in Members Doc's for detailed info about lathe threading.

RICH

1580
oxymax,

Don't know what to say as I wrote the manual by hacking at the program ( there was no documentation on it ) and everything I wrote in the manual worked.
I haven't used it in a long long time. Not manny folks have posted about using it.

You may want to post what version of Mach Mill you are using.
For work i did I always edited and then saved the file in Notepad.

Maybe someone else can will chime in.

RICH
 

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