Jeff,
There are a few machines that actually add a certain amount (usually specified in a parameter) to the "R" plane. Case in point our Cincinnati's the "R" plane is always programmed to the level of the top of the hole. The machine stays .100" away by default. The "Z" move is then always incremental from the "R" plane and assumed to be minus (it won't drill up away from the part like a Fanuc even if it is unsigned).
Benz
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]On Behalf Of JNB
Sent: Tuesday, March 30, 2004 10:49 PM
To: SmartCAM User Group
Subject: [mfg-smartcam] R levels

Hello group,
 
Am I missing something? Why would you want to have an R level of 0.0 on any tool?
This leaves no room for error when the operator decides to adjust the depth .050.
Drill's don't like slamming into the part before the cut.
I do programs with over 60 tools and many differant R levels and don't have a problem with it.
Is this a new practice that I've not heard of in my 25 years of machining?
 
Jeff 

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