Ron, as you probably remember I reported this bug quite a while ago and thought it had been fixed, but if it was fixed it creeped back in again. In the 2.74 version of the surfacing wizard, I have the Mist Coolant button selected on, but as the following generated code shows there is no M8 command to turn it on, only a M9 to turn it off at the end. Note that this "no coolant" problem had occurred in several of the other wizards also, so it would be a good idea to check to see if it got back in other ones also.
(Code by Newfangled Wizard, 5/20/2007)
(Program Posted for Aluminum )
G0 G49 G40.1 G17
G80 G50 G90 G98
G20 (Inch)
(***** Material Surfacing *****)
M03 S1082.3
G00 Z0.1
G00 Z0.1
G00 X-1.7 Y3.25
G01 Z-0.01 F20
G01 X8
G01 Y1
G01 X0
G01 Y-1.25
G01 X8
G0 Z0.1
G0 X0Y4
M5 M9
M30
The toolpath that is generated to do the surfacing also has a problem. This workpiece is 4" wide, 8" long and the zero point is at the lower left hand corner and is selected for this in the wizard. The cutting tool is a 3" diameter face mill and the wizard is set for feed stepover. The first pass makes sense, its at a centerline of Y3.25" which gives the expected 75% overlap of the cutter with the top of the workpiece. The second pass then occurs at a centerline of Y1, which makes sense as the cutter is moved over for another 75% overlap with the uncut part of the workpiece. Since the cutter is 3" in diameter, this means the cutter overhangs the bottom of the workpiece by .25", so after the pass the surface cut is complete.
However for some reason, an additional cut is made with a centerline of Y-1.25, making a .25" overlap cut on the bottom of the workpiece which is unnecessary since this part has been cut already.
Thanks,
Paul Titchener