Newbie- emc2 - need code example

[doc438]

Fresh Fish here,

Just upgraded my Sherline lathe to CNC over the weekend and now am "trying" to turn "anything".

Can do straight with increments fine.

I do not even begin to guess at how I am supposed to get a curve to cut.
Convex and Concave

Just a simple handle for files and rasps would do to start.

Have got CAD, Converter, and lathe software.

Fairly knowledgeable, not a guru, got first PC in 79 or 80 and it was frustrating at first also.

Thanks in advance for any and all help.

doc438

[acondit]

Doc,

Look at the attached txt file. The cnczone edits out some of the important info in the code so the original part of the post isn't correct.

Here is an emc2 subroutine for cutting a radius on a part. I set up offset coordinates for the subroutine and there are a few global variables that you must define #<_close_X> (close to X), #<_Xcut> (depth of cut for each pass) and #<_FineFeed> (specifies the feed rate for the cut). I also set up a lot of other variables that are not shown but the code snippet should give you the basic idea how one type of curve is cut.

( Cut radius on workpiece )
o SUB [1] [2] [3]                        ( 1 = X pos, 2 = Z pos, and 3 = radius )
G10 L2 P3 X#1 Z#2                                ( Set current work origin )
G56
G00 Z0.0
G00 X#<_close_X>                            ( close to but not touching X )
# = 0                                      ( X start for radius cut )
o DO
  o IF [ [#+#<_Xcut>] LT #3]
    #=[#+#<_Xcut>]                   ( Z start for radius cut )
  o ELSE
    # = #3
  o ENDIF
  G00 X#3
  G00 Z[0.0-#]
  G02 X[#3-#] Z0.0 I[0.0-#3] K[#-#3] F#<_finefeed>
o WHILE [# LT #3]
G55
G00 X#3
o ENDSUB

It is called like this.

o CALL [0.0] [0.0] [0.375]

Alan