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Author Topic: gecko540 problem under mach3  (Read 15024 times)

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Offline BR549

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Re: gecko540 problem under mach3
« Reply #50 on: October 10, 2011, 05:20:15 PM »
IF you repeat the test at 3" does it repeat ok each time??  IF so then it SOUNDS as if you have a feedscrew problem IT is not consistant and has ERROR in the manufactoring of it. ERROR in the grinding of the screw. OR you may have a GIBB problem in the table itself. A very well known problem in the low cost china made stuff. It is LOW COST for a reason.

You may be able to use the screw MAPPING function to work some of it out.

(;-) TP

Offline RICH

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Re: gecko540 problem under mach3
« Reply #51 on: October 10, 2011, 05:59:27 PM »
komar1970,
1.THK SR15 is a linear motion "RAIL".                                           
   I want to know the quality of the ball screw you are using. Is it rolled or ground?
   What are the specs for the ball screw? ie; lead deviation

2.Do you have a curve for the motors?
   How many wires do they have? Would be nice if you just posted where you got them and I will find what i am wanting if it's available.

3. Power Supply - 48 volt
   Please answer the questions Ray asked you:
  What is the current rating of the supply?
  What kind of supply - linear, regulated, switcher?
  Did you assemble or put the controller together from parts?
  If you purchased the controller, post info on it.

RICH
Re: gecko540 problem under mach3
« Reply #52 on: October 10, 2011, 06:42:42 PM »
ok   i setup  the  motor tuning   for X axis  to 402.5
I checked how the machine goes into the distance

25.4 mm   Distance is not reached 0.06mm it is ok
50.80mm Distance is not reached  0.02mm it is ok
76.20mm Distance too far 0.108mm
Re: gecko540 problem under mach3
« Reply #53 on: October 10, 2011, 06:46:02 PM »
IF you repeat the test at 3" does it repeat ok each time??  IF so then it SOUNDS as if you have a feedscrew problem IT is not consistant and has ERROR in the manufactoring of it. ERROR in the grinding of the screw. OR you may have a GIBB problem in the table itself. A very well known problem in the low cost china made stuff. It is LOW COST for a reason.

You may be able to use the screw MAPPING function to work some of it out.

(;-) TP



it goes every time in the same place, the problem is if you set the machine at a distance 76.2 it on shorter distances is bad

Offline RICH

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Re: gecko540 problem under mach3
« Reply #55 on: October 10, 2011, 07:02:55 PM »
So what kind and quality of ball screws do you have as i have requested in reply #51?

Not all ball screws are the same. The lead can vary, the lead can be different on going the opposite direction.
Lets not get into the lead error at this time since it is just one component of the system.

You calculated the steps  per unit as 400. So you should first check and adjust based on a long travel difference.
ie; If the steps are correct for say 10" and then you try 1" , how much it is off by at 1" will be small as compared to the long distance
if the screw lead error is linear over the long distance. Sometimes that is not the case.

But........I would rather you test a few things to find max velocity and acceleration first irrelavant of the exactness of the movement.

So keep answering the questions, please.

RICH
 
Re: gecko540 problem under mach3
« Reply #56 on: October 10, 2011, 08:53:58 PM »
I have block the longest is 9 "  i set  the  stp  to 400 in any way I could not get there in the distance 9" 228.6mm  I change everything step pulse vol, ace, it did not work , I had to change the step to 400.7596819 and then at 9''was ok ,  as I check several times this distance . after  I changed the distance to 1 inch , and at distance machine just traveled 25.2mm ,  as you can see all the time is the same problem  . gentlemen, I want to write again , This is not the only problem with this machine I have 4 machines , and 2 are on gecko540 and the same problem. one on NSK ball screw whit thk Linear   and the second ball screw form china  and  to thk Linear . 
I wonder if this is not a problem with the power support , the seller may put some cheap power supply, if you can give me some good power supply, I will exchange
« Last Edit: October 10, 2011, 09:03:34 PM by komar1970 »

Offline RICH

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Re: gecko540 problem under mach3
« Reply #57 on: October 10, 2011, 09:02:56 PM »
komar1970,
One machine at a time. I want it to be the one you have been describing all along in here with the C1 ball screws. We'll address the axis moves soon.
-----------------
How do you have the steppers wired? ie; Series or Parallel

RICH
Re: gecko540 problem under mach3
« Reply #58 on: October 10, 2011, 09:04:36 PM »
Series
« Last Edit: October 10, 2011, 09:14:30 PM by komar1970 »

Offline RICH

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Re: gecko540 problem under mach3
« Reply #59 on: October 10, 2011, 09:10:42 PM »
Just one last question,
What is the Dell computer model number? ie; Optiplex GX520

RICH