EMC interpreter was Re: BoBCad Question

--- In CAD_CAM_EDM_DRO@y..., "Art Fenerty" <fenerty@h...> wrote:

>I would appreciate it if someone can tell me how
> to tell BobCad how to output standard Canned Cycles.

They are done using the "drilling" capabilities of Bobcad. The output
is a fixed format that contains ONLY the parameters that come with
the software. They cannot be changed from one post processor to
another. The codes start with G81, G73, G83, G84, etc. The cycles
are completed with a G80 that turns off the drilling cycle. Between
the two commands, are one or more coordinate triples that tell the
controller how deep & where to drill teh holes. The cycles can be
for drilling, peck drilling, reaming, boring, tapping, etc. The
problem with Bobcad is that you must manually edit the first line to
get the correct parameters for any controller that is not identical
to the one that Bobcad produces. This may involve adding parameters
with values like Q1.3, or F 25.0, It may also mean that you must
change letters from what Bobcad outputs to another character, ie from
R2.6 to I2.6

Here's Vector(from EMC post):
N14 G83 X-2.5 Y4.3301 Z-0.5 R.1 P.1 Q.1 F1.0
N15 Y-4.3301
N16 X5. Y0.
N17 G80

Same thing from Bobcad:
N14 G83 X-2.5 Y4.3301 Z-0.5 R0.1 F1. Q0.1
N15 Y-4.3301
N16 X5. Y0.
N17 G80

Note the missing P or dwell time in seconds in Bobcad. You will have
to manually add this parameter if you need it.

>Do
> I understand correctly, that a Canned Cycle is a subroutine by

another name,

> or is a canned cycle limited in its application?
>

A canned cycle is NOT a subroutine. A subroutine involves
redirecting the serial execution of a CNC program, they are nestable,
and can have multiple repetitions.

A canned cycle is a valid word address, the same as G01, G02, G00,
etc. It is executed in sequential order the same as any other G-code.


Best Regards,

Fred Smith
IMService