Messages

4441

Members Docs / Re: SPINDLE SPEED CONTROL

« on: July 25, 2010, 10:46:49 AM »

Here is one provided by GhrisJ

4442

Members Docs / SPINDLE SPEED CONTROL

« on: July 25, 2010, 10:45:15 AM »

This thread contains user write-ups on spindle speed control.
RICH

4443

General Mach Discussion / Re: MPG dro

« on: July 25, 2010, 10:31:11 AM »

John,
I am still using an earlier version of turn and use two mpg's just for positioning and sometimes for machining.
You should be able to just click the Zero when in Program or Part coordinates. Now if your in Machine coord you need to
click the Zero World button as that will remove any work offsets.

RICH

4444

LazyTurn / Re: LAZYTURN MANUAL COMMENTS

« on: July 25, 2010, 09:43:35 AM »

Thanks Ross,
When i update the manual I'll take care of it.

I will consider all comments. None of the manuals or write-ups I have done were proofread for content or accuracy.
Certainly the writer shouldn't be the checker as he is blind to it all.

RICH

4445

LazyTurn / Re: DXF opening error: 0

« on: July 25, 2010, 09:04:46 AM »

Ross,
See appendix "B" in the manual, 3.6 Do not draw more than the top part / upper half of the profile....

See attached modified dxf.

RICH

4446

LazyTurn / Re: DXF opening error: 0

« on: July 24, 2010, 08:56:53 PM »

Can you post the dxf file so i can have a look at it?
Eventualy LazyTrun will be standalone but until then follow the installation info given in the manual.

RICH

4447

General Mach Discussion / Re: New Mill

« on: July 24, 2010, 08:50:41 PM »

Ken,
It's just takes some time and there are no shortcuts. Very difficult to sit down and read 150 page manual and expect to understand it.
Every thing is so interelated and as such it's extremely difficult to have a manaul written that keeps the thought train on track for a particular
item. CNC is certainly not plug and play. Mach is so configurable.

Sometimes trying to answer a question is like pulling a tooth, eventualy it comes out but can be a little painfull on the way.
You get stuck on something post and someone in here will be able to answer the question.
Heck, in time you'll be gumming it just like the rest of us! 

BTW, I am not even sure where or if the axis calibration via the Settings TAB is covered in the manuals.......and i was too lazy to look for it.

RICH

4448

LazyTurn / Re: LazyTurn

« on: July 24, 2010, 03:46:33 PM »

Dennis,
Arts reply takes care of the crop circles.
Make sure you draw in radius, LT in radius, and Mach Turn in radius!
or Dia...dia...diameter
Trust me, from personal experience ....not good to mix them up  
( Yes 12mm / almost a 1/2" is a lot)


To quickly test LT's code I just do a simple stepped  shaft reduction and a ball on the end of a shaft and all seems to
be on ( note that for a ball you will get flats since no arc coding is provided yet).

RICH

4449

General Mach Discussion / Re: New Mill

« on: July 24, 2010, 03:19:38 PM »

Kendall,
Yes you can make adjustments and you reply #15 is the axis calibration mentioned in one of my replies.

I believe you have 5mm ball screws:

200 steps / rev x 10 micro steps x 5.07614 screw turns per inch= 10152.28 steps per inch setting

10160-10152 = 8 difference
1/10152= approx .0001" movement per step....  so 8 x .0001"= say .001" difference if 10160 was used

-------------------------------------
So that is the calculated steps, but, life is not exactly perfect.
So try 10152
"     "    10146
"     "    10140  and see what the DRO is compared to measured.

What the calibration feature does is the equivilant and i will remark that the affect of small changes in steps per unit are not linear.
Please note that there is no such thing as "zero backlash", may be small but you will have some....!

---------------------------------------
Once the steps per unit are set and movement agrees with DRO. Then do some machining and see how it all goes.

You can change the velocity. For instance, see where the motors start to skip, say they skip at 180, then reduce your velocity to
70% of that and use 126 ( that gives you some head room for machining ) and you may want to fool with the accel in a similar manner.

Hope the above is more helpfull,
RICH

4450

General Mach Discussion / Re: New Mill

« on: July 24, 2010, 10:23:29 AM »

The machine has class P5 ball screws, since they brag about it, I assume that is good

Yes they are good...P5 lead accuracy is +-23um  / 300mm

The tighter the tolerance on milling, the more practical machining items like, coolant / cutting fluid, type end mill, cut passes / direction, etc come into play.You will find that there can be a difference by just not using a cutting fluid for the same material or the condition of the end mill.
If the spindle run out is a half thou, and then the collet has some eccentricity, end mill sticks out some, then before you know it you could have a thou run out at the tool cutting edge. Actualy machining something is good, but, you don't change the steps per units based on it.

 I said note the original settings, as i will assume that their steps per inch are correct, and thus you want to confirm.
So take your time and reafirm table movement by using a dial indicator or whatever as long as the method is accurate.

decrease the number amount of steps in the [Config>Motor Tuning], correct

Yes....but why not use the calibrate axis available in Mach ( it is fast and very accurate ).
 

Is there any other item that this will effect and need to be addressed in the [Config] when I do this?

For the small step changes that you may make it will not have any affect on the accel or velocity

RICH