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Messages - RICH

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1861
Tangent Corner / Re: New Kid.
« on: November 06, 2013, 05:49:49 AM »
Must say, cute little puppy ........... I guess you just dropped a level in the family hiearchy.
RICH

1862
G-Code, CAD, and CAM discussions / Re: Dolphin Cad Cam???
« on: November 05, 2013, 06:00:49 AM »
Nick,
I use Dolphin for the lathe and like it. I don't use the CAD feature since I prefer to just stick with other CAD orograms I have used for years and have no desire to learn the CAD of it. I purchased the Hobby version of it since since I am just a hobbiest. The software was easy for me to learn, the approach was logical for me, and not too many quirks in using it. I waited for years for an economical lathe software to become available, that never happened, so just bought Dolphin after comparing it to what was available. None of the lathe softwares are cheap. All of the free or economical ones are lacking or limited in what they do.

Can't speak for the mill package since i use Cambam.  


RICH

1863
General Mach Discussion / Re: Please help with lathe tool tables
« on: November 04, 2013, 03:09:50 PM »
A few thoughts Terry,
Once you set the tool table up the first time you should not do anything that is changing the differences between them. Of course if you
break or dull the tool you need to change the tool table by going thru the sequence of touching off the tools, or if you have a tool setter then change the particular tool offset manualy.   Depends how you work , but if you use a work offset, you won't see a difference in the tool table because you didn't do anything to screw it up. The only difference is the location of the master tool from the part.

Also if you keep the values of the tool table after they are touched off you could always just change the tool table manualy, apply / save, if you do something that screws it up.

An exercise worth doing is to create the tool table, then check to see if there are any work offsets, then do what you want, but  ONLY ONE STEP / or CHANGE at a time and see what the affect was     ie; did  the tool table values change, did the dro values for program/part/machine change, is there a fixture offset / is it different, what happens if one just changes the tool number while at home or at soem location, etc. You will learn a lot and it will keep out of the bars! Ou also should take a look at the first move depending on how the code was created ie;  wizard
use and using diameter or radius mode and current Mach settings.

Frankly, it can get confusing quick  especialy if you need to change screens to do things ( i use a modified lathe screen).

Remember all this is a fun thing, ;)

RICH



 


1864
General Mach Discussion / Re: Please help with lathe tool tables
« on: November 04, 2013, 09:09:12 AM »
Didn't get around to foolling with the lathe yesterday but will today and will follow what you did in reply 14.
So from memory let me say a few things and make an ask out of my self...............

Clicking the Zero World X and Z buttons will remove any WORK offsets that were created or saved and resets the DRO's to zero.
So if you now move the axis the DRO's will change reflecting the movement. So wherever the tool is located within the travel limits
of the axis ( by tool I am refering to the controlled point which is the point of the tool which actualy cuts the material), x&z=0 is based on where you were at the time you clicked the Zero World buttons. If you move away from 0,0, stop somewhere,
click the Set Home X & Z buttons, you have just told Mach that this is a location away from 0,0 which is home relative to 0,0 and within the travel limits.

So we now have Z & X =0 defined, and also have a home location defined within the travel limits.

If you move the axis away from home, stop, and then click the Home All button, the axes will move back to where you set home.  
G28 in the MDI ( do some reading on how G28 is used). You can use the Home x or z buttons for the individual axis to go back to home.

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

So you have a bunch of tools which were setup based on a master tool, say  T1, they a numbered on the tool holder so you can't mix them up . All the other tools are based on T1.That master tool is never used for cutting, thus no wear / the controlled point never changes. You use the master tool to setup the lathe.

So all you need to do is read section 4.5 of Appendix "F" in the Lazyturn Manual which can be found in Members Docs. You simply create a work offset

 (IE;G54) THUS THE TOOL TABLE IS IS NOT AFECTED.


Hope I didn't confuse,

RICH



1865
General Mach Discussion / Re: Bizarre threading problem
« on: November 03, 2013, 08:56:40 PM »
FWIW,
Mach compensates for changes in spindle rpm, slow down only, and adjusts the next pathing based on what the real time ( ie; it is not manipulating some reading and the shared time with windows ) rpm was, and averages it if spindle speed averaging is selected and as such then you have two compensations fighting each other, namely the vfd trying to maintain an rpm and mach trying to correct for a slow down of rpm. So the fix was to set rpm manualy and not have the problem. Frankly, good threading relies on enough spindle power being delivered to maintain the rpm and as you deviate from that threading results / accuracy will suffer. Frankly, if your spindle speed is solid spindle speed averaging dosen't do much for you.

Not sure if things have changed in later versions of MACH as i still use an older version......

RICH

1866
General Mach Discussion / Re: Increasing feedrate when threading
« on: November 03, 2013, 12:43:05 PM »
There is wirte up called Threading on The Lathe - Mach3  which you can find in Members Docs that covers all aspects of threading.

What version of Mach are you using?
When you use the wizard do you click the button to calculate the number of passes to ensure that you are not exceeding available  feedrate rate?

The rpm DRO should be steady at the set rpm, maybe a flicker within 1 rpm occasionaly.
If there is a slow down of the spindle during threading mach will adjust the next pass to try to correct for it. It cannot correct for a spindle
increase in rpm.

Post the gcode that was generated by the wizard and also you xml file.

RICH

1867
General Mach Discussion / Re: Please help with lathe tool tables
« on: November 03, 2013, 09:03:42 AM »
Good vid Hood, way much better than trying to put it into words.
Don't care what they say about you, your allright....... :) :) :) :)

RICH

1868
General Mach Discussion / Re: Please help with lathe tool tables
« on: November 03, 2013, 08:29:45 AM »
Have a look at Appendix "F" in the Lazyturn Manual which can be found in Members Docs.
I think you are creating an offset. Note that Milton uses  a home position and i will remark that different folks
setup differently, but what is important is that you are consistant in what you do and it works for you.

Haven't used my cnc lathe for a couple of months now and hope to refresh my memory later today.

Remember that all tools are relative to a single tool but all the tools are also related to each other and Mach keeps track of the info.
I suggest you play a little, do exactly what you posted but every time you click a button or make a move just open the config >offsets
and see if something changed.

Later .......
RICH

1869
General Mach Discussion / Re: backlash comp creates follow error
« on: November 01, 2013, 08:53:18 AM »
I have not used backlash in long time because I got rid of it on all my machines.
But that silly .001" can be a real pain to get rid as there are so many things that can add up to create it.

The  50-50-50 rule which you may want to consider is as follows:

50% - The max velocity at 50% ( works for steppers but your using servos so will need to play around with the value )
50% - Set the shuttle Wheel setting in configuration to .0050  to .050 ( .5 too slow )
50% - Backlash speed

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.

Hope this helps,

RICH

1870
General Mach Discussion / Re: Neet help with driver 1545
« on: November 01, 2013, 08:37:36 AM »
- For SW 5,6,7, use 1/10 Microstep setting as there is nothing to be gained by going higher.
- For SW 1,2,3 use 2.7 Amp setting ( you can go to 3.2 or 2.3 , test and see how the motors react)
-  FOr SW 4 use full current
- I don't know what they mean by " in the driver has a jump" , try single pulse

Go to Members Docs and there you will find a spread sheet that calculates the steps per unit based on your input.
You  can use the axis calibration feature of Mach, which is in the lower left corner of the screen that comes up
upon clicking Settings (ALT-6 ) Tab at the top. I would suggest you first calculate the steps per unit and then check
using the axis calibration feature. Note that that you should check by having backlash removed from the axis in the direction you going to move.
Additionaly the move should be as long as possible (ie;almost full length of the axis travel).
Then check to see if you have backlash, and if so, either get rid of the backlash or use the backlash compensation feature of Mach.

Use an low  velocity, say 10 with an accel of 1 for motor tuning and then double each value until the motor skips, and then reduce those
values by say 30%. You will need to test when machining different materials and see what is appropriate for your needs.

The above should get you in the ball park and you can refine based on testing.

NOTE: You need to provide the info Hood requested.......!

RICH

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