For the last couple weeks, running the 2.8.0-pre# my tool, a .250" 
diameter mill as shown in the tool table, has become a single, weakly 
flickering pixel that is very hard to follow in the backplot, and 
extremely easy to lose track of.

The  command is M6 T1 to switch to it in my code.

The tool.tbl:
gene@GO704:~/linuxcnc/configs/GO704fast$ cat tool.tbl
T1 P1 X0 Y0 Z0 D0.25 ;1/4 inch mill 
T2 P2 X0 Y0 Z0 D0.126 ;1/8 drill 
T3 P3 X0 Y0 Z0 D0.135 ;5/32 drill 
T4 P4 X0 Y0 Z0 D0.038 
T5 P5 X0 Y0 Z0 D0.041  
T6 P6 X0 Y0 Z0 D0.052 ;0.052 pcb component lead clearance drill 
T7 P7 X0 Y0 Z0 D0.0514 ;placeholder pcb bigger component clearance drill 
T8 P8 X0 Y0 Z0 D0.001 ;interconnect pattern etch 
T9 P9 X0 Y0 Z0 D0.0625 ;reference hole drill 
T10 P10 X0 Y0 Z0 D0.04 ;a #58 drill 
T11 P11 X0 Y0 Z0 D0.0625 ;a .0625 2 fl end mill 
T12 P12 X0 Y0 Z0 D0.0312 ;added 20130917 
T13 P13 X0 Y0 Z0 D0.0015 ;added 20130918 
T99 P99 X-1.6505 Y0.6823 Z0 D0.0001 ;test of camview-emc, added 20131128 

Am I doing something wrong?  Or are these measurements now being 
interpreted as mm's?  Just for S&G, I'll edit tool 1 to be a 6.35mm 
(.250") tool when I get back to that machine.

Side comment, FWIW: Much of what I use lcnc for in woodworking is 2D, and 
I find that the 3D display, like when doing multiple passes to get to 
full depth, of a wood joint where the tool path is just being duplicated 
per depth pass, is needless dirtying of the backplot display, so I would 
suggest disabling this feature when an individual axis is chosen for the 
displayed backtrace.  I think its ok for the default angled view, and 
may be helpful/informative there in helping to visualize things. Using 
the first Z view, having the displayed trace shrink as the tool 
descends, is not helpful.  In fact it has made me check my code for 
unwanted, typu driven scaling errors until I realized I was looking at a 
3D view from straight up, apparently from the homed, fixed position. Z 
home for me is near the top of the post so the scaling effect isn't 
huge, just enough to muck up the view.

Perhaps this 3D mode could be made switchable in the view menu?

Hypothetical question, throwing it out to see if it sticks to the wall:

If I was to mount a dovetail bit, how would that be entered into the 
tool.tbl?  An inverted cone, with a minimum diameter shank sticking out 
of the truncated tip might do, but to be precise, would need to be able 
to specify the angle of the dovetail, usually 7 degrees but I have seen 
up to 14 degrees.  That large invites sloppy work though, and does 
nothing to enhance the strength of the joint when wood is the medium.

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page <http://geneslinuxbox.net:6309/gene>

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