I'm getting close to having time and a machine to do some development work 
on.

My long list includes the ability to add complex cycles by writing g-code 
subroutines to implement them. At the user level, they would be used exactly 
as if they were built in to the interpreter.

Ken

----- Original Message ----- 
From: "Chris Radek" <[EMAIL PROTECTED]>
To: "Enhanced Machine Controller (EMC)" <[email protected]>
Sent: Monday, December 03, 2007 5:18 PM
Subject: Re: [Emc-users] g98/g99


> On Mon, Dec 03, 2007 at 01:18:54PM -0600, Stuart Stevenson wrote:
>> The g98/g99 commands seem to
>> work "almost as expected". The description in the EMC2 "G-Code" Quick
>> Reference seems reversed. It is confusing.
>
> Jeff said they are reversed in the quick ref.  I see he committed a
> fix.
>
>> number 4 - I have never liked this statement "backed off a bit". It is
>> set by a parameter in the control. Some materials and hole sizes
>> require a different amount of "backed off a bit".
>
> In EMC2 this "a bit" is always .010 inches.
>
>>     The fanuc control also has a G73 peck cycle. This cycle doesn't
>> retract out of the hole, but instead retracts "just a little bit" to
>> break the chip, then feeds from that point. This is another example of
>> the "backed off a bit" I have never liked.
>>     I don't know if anyone has any interest in implementing G73 or any
>> other cycles. It is not a big issue. The only issue I see for general
>> use is - without the G73 cycle EMC is less compatable with some
>> existing programs.
>
> No reason not to add this.  It's a useful cycle.  The arguments would
> be exactly like G83 I assume.
>
> I will let others comment/worry about how G98/G99 work.  I have never
> changed this from the default and I guess I program the R plane to
> be the same as the safety plane (starting height) so I wouldn't
> notice any difference.
>
> Chris
>
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