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Date: 05/09/01 at 2:25 PM
Posted by: col
E-mail: cols@bigfoot.com
Message Posted:

In Reply to: FANUC CONTROL CYCLE G71 TYPE II posted by selim salim on 03/24/01 at 6:37 PM:

If the conterol you are using is fanuc ot then you use it like this.

g71 takes up 2 blocks.
ie. G71 U2.5 R.5;
G71 P100 Q150 U.5 W0.05 F.2;
In the first block the 'U' is depth of cut (radially) and the 'R' is lift off after the cut that's in x and y+
in the second block 'P' is the start No. of the outline to be turned and 'Q' is the end block No.
The 'U' is amount left on x for a finish cycle and 'W' respectively is the amount on z. 'F' is simply the feed rate. I use mm per rev. (with me so far?)
The start position of the tool is determined by the last block before the g71 is called up (where you left it.)
The first move in the outline block should be the finish diameter of the componant in x only and is usually a g00. Follow this by g01 move and follow the outline as needed. Re-entrants are not allowed and please be careful of catching any protruding pieces of the componant. After the final block of the outline use G70 P100 Q150 F.1 (or whatever the block no's are, and feed rate) and the g70 will follow the same outline taking the allowance you have left in the initial G71 block. It sounds complicated but it is a good cycle to use as it allows for tapers and chamfers, and lets you determine a set finish allowance which always helps with tolerances.
If you get stuck e-mail me and I'll try explain again with an example or such like..]#

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