change feed on a drill cycle:

[ROB]

anybody knows if it it possible

to change feed on a drill cycle like G81-G83

EXAMPLE OF A DRILL CYCLE FOR FANUC:

Z0 IS THE TOP OF THE PART!

G98G83Z-1.R.05Q.1F1.5

NOW THE QUESTION!

CAN I CHANGE MY FEED AT Z-.9

BEFORE IT BREAKS THRU?

 

[Guest CNC Apps Guy 1]

Sounds like custom macro or time to create a custom drill cycle to me. The standard canned cycles don't handle that. It's a machine issue.

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James Meyette

[This message has been edited by James Meyette (edited 05-01-2001).]

[Luther_Heggs]

Don't think so - not within a canned cycle anyway. The feed is defined in the G81 (start of canned cycle line) and the only things you can change (that I know of) when within a canned cycle is the depth and retract height.

Sounds like you need a manual cycle of some type.

[Andy]

Or, you could use 2 drilling ops. First one at feed A to z-.9 and second op at feed B and choose the appropriate top of stock and retract and clearance values to rapid to z-.85 before it feeds.

The only drawback is the tool will have to return to the rapid plane before the second op kicks in.

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Gordon Engineering

Eureka, Ca.

V8 Lathe and Mill

[Kenneth Potter]

You can create your own drill cycle with multi feed changes by subprograming out the Z plunges.

Hope this helps

Kenneth Potter

[Simtech]

Sometimes, the good ol' fashion way can do fancy things. Just generate a "longhand" drill cycle using G0 and G1 moves and change your feed rate whenever and to whatever value you want.

In the post you would have to change the variable "usecandrill : no "

Just my 2%

[Allan Brown]

Simtech - Hopefully your 2% adds up to much more than the typical 2 cents.