Direct Tapping on VK45

[firstreal]

Hi,

i' have a problem with my VK45 with seicos control.

I've to do a direct tapping with G841 code, and it's work fine, but sometimes
when a tapping is finished the machine doesn't go to the next hole.

When it happens i see on frequol's display a number of 1 / 2 instead of 0 ( i think that the machine wait the spindle stop signal before move to the next hole )
There is a parameter to decrease sensitivity of the frequol, or a parameter to bypass this error on seicos control?

Thank you

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[shas595]

Assuming it is a Seicos III with an FR-SF Freqrol - there is a method to adjust the direct tap drive built into the machine.

Make this quick program:
G21;
G91 G28 Z0;
S2000;
G841 S2000 F2000 Z-200. L10;
G80;
G20;
M30;

Run the program in single block. When you get to the G841 line - Press FR/BK -> Press F4(SYSTEM) -> Select 2.DIAGNOSE -> Select 3.RELEVANT TO SERVO
and check the spindle droop amount.
Is it zero ? (Number 01 - value under S)

Let me know
john

[firstreal]

Thank you John

No.. the value oscillates between -105 and -126 ( when the spindle is stopped )

Enrico

[shas595]

Best is 0, good is +/- 15, and anything more is not good. Hold the AUX button and press H - this will take you to the Servo Adjust Screen. Adjust the loop gain at the bottom, press return and repeat the steps from before and get it as close to 0 as possible

John

[firstreal]

I changed the value from 60 to 250 , and in diagnosis screen i read a medium value of -15, but is normal such a big difference in the values that I changed?

Enrico

[shas595]

Enrico

It is ok - as the drives get older they need tuning up. Try that out now and see if your program stops

John

[firstreal]

It seems to work.....

Thank you John

Enrico

[shas595]

Glad to hear it - let me know if there is anything else I can help with
John