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Messages - RICH

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2731
General Mach Discussion / Re: backlash on Z axis
« on: April 08, 2012, 07:55:23 AM »
Eliminate the backlash then you won't have a problem and you will be a much happier camper.
How is the Z movement done on the mill?

I solved my problem by raising and lowering the quill using a ball screw. Now hold  a 1/2 thou.
RICH

2732
General Mach Discussion / Re: Spindle Index Pulse Problem
« on: April 08, 2012, 07:17:15 AM »
Hood,
Ah ...as noted in the first posting....
I never did any testing with the SS and haven't used mine in a long time. So additional electronics are involved.

If we just forget about the actual threading then there seems to be a timing issue. ie.The G95 informs Mach that the index was seen x amount of times and
based on an average of the rpm the axis is then instructed to move / accelerate over some linear distance. So the index trigger point,
acceleration value, current rpm of the spindle in a time frame, and actual movement of the axis needs to be consistant to arrive at an exact location.
If one were to use  a thin disc ( btw ....the bigger the disc diameter the better one would see any timing issues ) you can get a flavor of magnitude since the cut marks would be off by a greater amount.

If we assume that there is no backlash, the starting point is exactly the same location, and the system can respond  to the requested motion,
but, and i say but , the instructions are not the same  as the PP, then there could be something wrong in MACH. But before one guesses at that they need to verify that the system is all correct and that is hard to pin point a possible problem.

He is using a max velocity of 190 with accel around 4. So even though his kernel frequency is high that dosen't mean he can use that high velocity in a repeatable
accurate way. The max values are used during the move from standstill to the start of the threading and not the 65ipm he notes.
Maybe try a reduction in spindle rpm and velocity to say 1/2 the currrent velocity value and do some testing to "scribe" marks on the edge of a disc.
I will note to use the wizard since it will check that the spindle rpm and current tuning settings are adequate for the threading to be done.

Not sure what else to say at the moment.....

RICH



2733
General Mach Discussion / Re: New to CNC
« on: April 07, 2012, 10:19:33 PM »
There are CAM programs that will generate the code required to do anything from simple to very complex. So there is no reason to sit down and
write thousands of lines to do something. That does not mean one should just use a "tool" to do the tedious work.
An understanding of gcode is required to run the  cnc machines. CNC is not plug and play.

There are no short cuts to CNC and it can be a never ending learning curve depending on what one is doing or wants to do.

I would suggest that one skip all the BS and searching the internet for some magic button and just invest in Smid's CNC Programing Handbook
since it can be rather easy reading, well at first,  and takes one from beginning to complex. It's 500+ pages will be an excellant reference for years to come.

While your reading that book, download and start reading the MACH Manuals.

You can try out all the different wizards, LazyCam, and other free programs which generate gcode.

RICH

2734
LazyCam (Beta) / Re: Text workflow advice for instructor
« on: April 07, 2012, 07:39:49 PM »
You could use the text wizard available in Mach, or Lazycam, or even Cambam to generate the gcode for the text.
Most Cad programs provide for text and you can save the text as a dxf file and import that into LazyCam or Cambam to generate the gcode.
"EVERY GOOD PERSON DOES FINE" to be politicaly correct these days comes to mind! ;)

BTW....Probably easier to download DeskEngrave from the internet, which is free, and it will produce the code. No learning curve ....even a
caveman can use it! :D

RICH

2735
General Mach Discussion / Re: Spindle Index Pulse Problem
« on: April 07, 2012, 07:26:47 PM »
I am thinking that the threading cycle may be fighting the VFD. The cycle is adjusting for the 2-3 rpm change and adjusting feedrate based on the average. The more stable the rpm the better ( like 1 ). Then on the next / following  thread cycle the VFD changes the rpm some and there is also a  modified feedrate from the threading cycle compensation and you end up with an even greater "equivalent" swing in the rpm.  I am assuming that backlash is not a factor. Just a thought and that's why i said can you set it manualy.

I am also assuming that when you run the driver test that the pulse stream is consistant and close to set kernel speed selected.

No need in testing to actualy do threading as you can do per your reply the G32. You should be cutting "a thin" disc at the same mark every time...very closely in fact as seen under a micropscope ......not even see a slight deviation....if not not forget about even trying to do multiple threads.
 
RICH

2736
General Mach Discussion / Re: Lathe turret design
« on: April 07, 2012, 06:10:26 AM »
Suggest you do a search and have a look at what Hood has recently done. My only comment is that you want the turret to lock up tight.

RICH

2737
Do a search and you will find a lot of info on what you want to do. The user "Simpson" has posted a lot about developing a 4th axis for both indexing and using it as a spindle. I will remark that a servo should be used and not a stepper. Stepper is ok for indexing but not to drive it as a spindle.
RICH

2738
General Mach Discussion / Re: Spindle Index Pulse Problem
« on: April 06, 2012, 12:02:52 PM »
Are you setting the spinde rpm manualy?
RICH

2739
LazyTurn / Re: Tool tip radius
« on: April 05, 2012, 06:50:24 PM »
Just for you....
RICH

2740
General Mach Discussion / Re: Mach lathe losing position
« on: April 05, 2012, 07:01:47 AM »
You will always have some backlash in a system just depends on how much. If the thrust bearings are not preloaded right you can have varying
backlash. Usualy it is not repeatable and varies some. Since it's part of the of the backlash it's difficult to isolate. ie; ball nut +screw+bearing play

What is slow acceleration?
Slow could be an acceleration value which low as compared to say the max acceleration one could use for their system. How much or percent
of max is relative. Acceleration is just a number which one can relate to in how fast the axis can change from current velocity to a higher or lower velocity.
The value for a system is directly related to motor torque since it is the motor which must provide the power / force to overcome the current inertia of the system. Acceleration is specific to your machine, thus you have the capability for some desired rate and it's acceptable or need to change something to get an increased acceleration. The value you use should be reliable ie; you can only have a reliable velocity which would be below it's max and likewise would set the acceleration accordingly.
RICH
  
 

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