Messages

51

CS-Lab / Re: Problem with index homing

« on: September 03, 2015, 03:04:33 PM »

The gearing is 24 teeth on yhe x and y servos which mesh with a 60 teeth gear on the ball screws.
On the z axis the gear on the servos is 24 teth as well, but it meshes with a 24 tooh gear which in turn drIves the 60 tooth gear on the ball screws. I think my math is correct.

52

CS-Lab / Re: Problem with index homing

« on: September 03, 2015, 03:00:53 PM »

I did say 3000 didn't I. My test indicate that the x and y axis are 3k and the z axis is 2 k. It comes out to 500 pulses per mm if my calculations are correct. It seems odd to me that the encoders would be different but the gearing on the z axis is different as well. The z axis is geared 1/3 Lower so with 2000 pulses per revolution it still comes out to the same pulses per mm. Is that normal?

53

CS-Lab / Re: Problem with index homing

« on: September 03, 2015, 12:36:44 PM »

the plugin test indicates that they are 2000 pulses per rev so I've got the plugin configured for 2000 lines, but I'll try 4096 when I get to the shop later. Thanks hood.  I don't know what CS labs would do without you:)

54

CS-Lab / Re: Problem with index homing

« on: September 03, 2015, 11:46:35 AM »

They are brushed DC and the machine was made in 1979 if that helps.

55

CS-Lab / Re: Problem with index homing

« on: September 03, 2015, 09:34:49 AM »

O have no way to telling how many lines the encoder has. I've contacted Yaskawa and they don't have any information on the encoders. Can I simply use the method I described above using the CSMIO plugin to count the pulses or should I keep trying to chase down literature on these encoders?

56

*****VIDEOS***** / Re: PLC tool change running!

« on: September 03, 2015, 09:31:13 AM »

Thank you!

57

*****VIDEOS***** / PLC tool change running!

« on: September 03, 2015, 12:09:10 AM »

This is just a brief demo. I'm going to try and upload a longer video tomorrow.
The machine has a csmio/ip-a controller and an automation direct DL06 PLC which runs the tool changer.

<iframe width="560" height="315" src="https://www.youtube.com/embed/jSiewzLw_mU" frameborder="0" allowfullscreen></iframe>

58

CS-Lab / Re: Problem with index homing

« on: September 03, 2015, 12:02:46 AM »

Thanks for your response, Hood. I disconnected the servo from the ball screw and turned the servo 90 degrees. No change in whatsoever. I looked at the wiring and I really don't have anything that would cause too much noise. I do have 12V to5V optocouplers between the encoders and the IPA; maybe the single pulse is getting lost in the opto-coupling. But there are LEDs on the optocouplers that light up on the pulses. I can see the index pulse flash when I pass it.

As far as having the right number of pulses per revolution, I used the readout from the CSMIO plugin window that displayed the encoder pulses in realtime. I set the encoder at 0 and used the mpg to complete one rotation of the servo. At the end of one rotation the display read 3000 pules for the y axis (I'm assuming the X and Y are the same) and 2000 pulses for the Z axis. Due to different gearing in the Z axis, it comes out to the same number of pulses per inch on all axis. I've also played with the numbers and put pulses per revolution in the tens of thousands so if the index pulse was getting lost it the ipa would simply assume that it hadn't reached it yet.

My only thought it this. Does the index pulse have to come after the axis has moved off of the homing limit switch? What happens if the switch is triggered but the axis decelerates past the index pulse a time or two? Ive played with speed and it seems the issues happens independent of any speed.

59

CS-Lab / Problem with index homing

« on: August 31, 2015, 08:36:01 PM »

Almost done with the Matsuura MC500v retrofit and I'm running into an issue with index homing. When I attempt to reference all axis, the machine moves until it triggers each reference switch, but while its backing off the switch to find the index pulse sometimes  I get an error that reads "Index distance not within allowed limit'. I'm not sure what this is about. Using the CSMIO/IP-A plugin, Ive counted the index pulses per revolution (2k in the Z and 3K in the X and Y), so I know thats not it.  Even more perplexing is the fact that it doesn't always happen and it won't always happen on the same axis twice. Am I missing something? Thanks for any and all help.

Jonathon

 

60

CS-Lab / Re: Matsuura MC500v retrofit with CSMIP/IP-A

« on: August 27, 2015, 05:36:25 PM »

Thanks! I ended up using the stock servo drives. I think they're CPCR MR052-nb made by yaskawa. Its a pretty cost effective way to go about a retrofit. Servo drives are quite pricy and the available selection of analog drives is pretty slim. What year is your MC500?