Ref: Rapid Traversr

Apr 06, 2008 5 Replies
D

Applies to Fanuc 31:



Parameter 1601 #4 RTP = 0 Blocks are overlapped in Rapid Traverse 1 Blocks are not overlapped



Parameter 1601 #5 NCI= 0 Confirms that the specified feedrate becomes



0 (the accel/decel delay becomes 0) at delcelaration time and that the machine position has reached a specified position (the servo positional deviation is within the in-position width set by parameters #1872.

Parameter 1601 #5NCI= 1 Confirms only that the specified feedrate becomes 0 (the accelaration/deceleration delay becomes 0)at decel. time.



Parameter 1722 = Rapid Traverse feedrate ratio for overlapping rapid blocks.



Only one parameter determines the "In position zone" 1872, this actually applies to all Fanucs (not always the same parameter #)



There are quite a few parameters that describe acel/decel/time constants for contouring, threading, corners...........blah blah blah



The description that KG wrote is the way it works



Daveb


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J

I wouldn't argue that but there are a bunch of following error settings that effect positioning tolerances. A big bunch. There is in tthe zone and then there is in the zone within preset limits.

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D

Actually you can use 1826 and 1827........Feed and Rapid in position zone but you need to set 1801 #4 ,

No matter what other parameters are set or how they are set they MUST be within this bandwidth to execute the the next block Daveb

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J

You can also flip that over if you want. Ignored is also allowed if you want true open loop. I've seen 15's that were off location by as much as a quarter of an inch or more at speed while we dialed in the AICC parameters.

Anyway, you work with this stuff and at this exact level every day. I don't and you'd be one of the people I'd call if I needed info.

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D

I have never worked on any real high speed applications, so am not familiar with the problems that come up.

This is an something I gather you work with often.

Regards

Daveb

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J

Not really that often. What I see often is poor integration by builders that haven't much of a clue beyond iron. Have you ever worked with Andy from Anaheim? There is a guy that knows what's up.

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