Archive for June 1st, 2010
Having recently converted to EMC 2.4 and switched the tool table to the new format, I took the opportunity to add a few useful drills.
Low numbers are random end mills & suchlike. Number drills run from 100 to 180, and I’ll add more as I need ’em. Fraction drills run from 201 through 264, although it’s highly unlikely I’ll ever fit a 64/64-inch drill in a chuck that also fits in the Sherline spindle.
All the Z lengths are exactly 1, because I now have a tool length probe that is absolutely wonderful.
In practice, I use the tool table mostly to tell Axis how to draw the tool cylinder in the backplot, because I feed in most diameters directly in the G-Code. The Axis “manual toolchanger” routine prompt will now serve as a mnemonic for the actual size, but I write the G-Code to emit a (debug, #Drill_Size) message for clarity.
The Sherline.ini file references the tool table with the line:
TOOL_TABLE = Sherline.tbl
; Common end mills T1 P1 Z1 D0.1225 ; 1/8 T2 P2 Z1 D0.1535 ; 5/32 T3 P3 Z1 D0.187 ; 3/16 T4 P4 Z1 D0.25 ; 1/4 T5 P5 Z1 D0.3122 ; 5/16 T6 P6 Z1 D0.374 ; 3/8 T7 P7 Z1 D0.4374 ; 7/16 T8 P8 Z1 D0.4720 ; 1/2 T20 P20 Z1 D0.09787 ; 2 mm ; Number drills T107 P107 Z1 D0.201 ; 7 5.11 10-32 clear T109 P109 Z1 D0.196 ; 9 4.98 10-32 clear T118 P118 Z1 D0.170 ; 18 4.32 8-32 clear T121 P121 Z1 D0.159 ; 21 4.04 10-32 tap T127 P127 Z1 D0.144 ; 27 3.66 6-32 clear T129 P129 Z1 D0.136 ; 29 3.45 8-32 tap T136 P136 Z1 D0.107 ; 36 2.72 6-32 tap T132 P132 Z1 D0.116 ; 32 2.95 4-40 clear T143 P143 Z1 D0.089 ; 43 2.26 4-40 tap T141 P141 Z1 D0.096 ; 41 2.44 2-56 clear T148 P148 Z1 D0.076 ; 48 1.93 1-72 clear T150 P150 Z1 D0.070 ; 50 1.78 2-56 tap 0-80 clear T152 P152 Z1 D0.064 ; 52 1.63 0-80 clear T153 P153 Z1 D0.060 ; 53 1.52 1-72 tap ; Letter drills T203 P203 Z1 D0.047 ; 3/64 1.2 0-80 tap
It turns out that the tool table has an undocumented limit of 50-some-odd entries, at least in EMC2 2.4.1. That puts the kibosh on my plans to add a bunch of entries to cover all the drill sizes Eagle might require for a PCB. More on that in a while …