Machining

English-style Dovetailed Steel Infill Smoothing Plane

A13 Type - Jim Yehle - Salt Lake City - Jan 2003

These milling maching programs use the CNC language of the Anilam 1100 three-axis control. Its "conversational" program files have a .m extension. The mapping from this language to G-codes is generally obvious, so a translation to G-codes should be easy, if that's what you need.

I caution those who would use these programs to review all aspects of the machining before proceeding. CNC programs such as these cannot take into account all aspects of making a part. Important variables include fixturing the part to clear all tool paths, and cutting speeds and feeds. I tried to set the feed rates so that running at 100% won't burn anything up. (This control has a 0-120% feedrate knob which can be adjusted during the run, and I'm constantly fiddling with it.) In any case, it's wise to make test runs with the Z axis set high enough to clear everything, then test parts in wood, especially of the dovetails for fit-testing. You will note that I needed to tighten up the dovetails by five or six thousandths before cutting the parts.

Parts for Body

Part	Portion	CNC prog	Tool	Drawing (PDF)
Sole	left edge pins	sole-l1.m (HTML or text)	3/8" end mill	jy-a13-side a13body-mach
Sole	left edge pins	sole-l2.m * (HTML or text)	1/2" 60° dovetail †	jy-a13-side a13body-mach
Sole	right edge pins	sole-r1.m (HTML or text)	3/8" end mill	jy-a13-side a13body-mach
Sole	right edge pins	sole-r2.m * (HTML or text)	1/2" 60° dovetail †	jy-a13-side a13body-mach
Each Side	bottom (dovetails)	sidebot1.m (HTML or text)	1/2" end mill	jy-a13-side a13body-mach
Each Side	bottom (dovetails)	sidebot2.m (HTML or text)	1/2" 60° dovetail †	jy-a13-side a13body-mach
Left side	top profile	Y13LSIDE.M	1/2" end mill	jy-a13-side a13body-mach
Left side	top chamfer, rear	LSIDE-CR.M	3/4" 45° chamfer mill ‡	jy-a13-side
Left side	top chamfer, front	LSIDE-CF.M	3/4" 45° chamfer mill ‡	jy-a13-side a13body-mach
Left side	mid-top chamfer	(none)	15° chamfer mill	jy-a13-side
Right side	top profile	Y13RSIDE.M	1/2" end mill	jy-a13-side a13body-mach
Right side	top chamfer, rear	RSIDE-CR.M	3/4" 45° chamfer mill ‡	jy-a13-side a13body-mach
Right side	top chamfer, front	RSIDE-CF.M	3/4" 45° chamfer mill ‡	jy-a13-side
Right side	mid-top chamfer	(none)	15° chamfer mill	jy-a13-side

† 1/2" dovetail has a diameter of 1/2" at the tip, i.e. its largest diameter
‡ 3/4" chamfer mill has that diam. at the top, smaller diam. at the tip
* These contain a math error which lead to creation of secondary dovetail bevels of 12.1° rather than 15° as designed.

Programs for Dovetail Test

Only the first few cuts, starting from the front, which allows the use of small scraps for testing.

Part	Portion	CNC prog	Tool
Sole	left edge pins	SOL-L1.M	3/8" end mill
Sole	left edge pins	SOL-L2.M *	1/2" 60° dovetail
Sole	right edge pins	SOL-R1.M	3/8" end mill
Sole	right edge pins	SOL-R2.M *	1/2" 60° dovetail
Each Side	bottom (dovetails)	SIDBOT1.M	1/2" end mill
Each Side	bottom (dovetails)	SIDBOT2.M	1/2" 60° dovetail

* These contain a math error which lead to creation of secondary dovetail bevels of 12.1° rather than 15° as designed.

Lever Cap

Part	Portion	CNC prog	Tool	Drawing (PDF)
Lever Cap	back (top) profile	LEVCAP-T.M (HTML or text)	1/2" end mill	levercap
Lever Cap	top, front curve	LEVCAP-R.M (HTML or text)	1/2" end mill	levercap
Lever Cap	top, front curve	LEVCAP-L.M (HTML or text)	1/2" end mill	levercap
Lever Cap	bottom, lower relief	LEVCAP-B.M (HTML or text)	1/2" ball end mill	levercap
Lever Cap	bottom, upper hollow	LEVCAP-H.M (HTML or text)	3/8" corner-radius mill	levercap

Note: positions for LEVCAP-B.M were generated by program levcap-relief.prl

Adjuster

Part	Portion	CNC prog	Tool	Ref. dwg. (PDF)
Traveler harness	profile, stem end	TRAVHAR1.M	1/4" centercutting end mill	jy-adjuster-parts jy-adj-travhar-mach
Traveler harness	profile, traveler end	TRAVHAR2.M	1/4" centercutting end mill	jy-adjuster-parts jy-adj-travhar-mach
Traveler harness	bore for stem	TRAVHAR3.M	.185 drill, 3/16" chucking reamer, 1/4" centercutting end mill	jy-adjuster-parts

Note: stem, knob, swivel, traveler, and iron-screw are made on lathe--no CNC program available.

Infill

Part	Portion	CNC prog	Tool	Ref. dwg. (PDF)
Closed Tote	adjuster mortise	ADJ-MORT.M	3/8" centercutting end mill	jy-a13-infill-dim
Closed Tote	adjuster stem slot	STEMSLOT.M	3/8" ball end mill	jy-a13-infill-dim

Not yet linked to tables:

ironhole.m Screw-hole at end of slot in iron
(none) Slot in iron
irontapr.m The two tapers at the rear of the iron
soleslot.m Slot for iron in sole
lside-dr.m Drilling, left side (rivets, lever cap pivot, grub screws)
rside-dr.m Drilling, left side (rivets, lever cap pivot, grub screws)

I probably won't recommend these (and why):

thrplate.m Throat plate front taper, side milling (bad idea)
levcap-b-040.m Lever cap bottom relief w/ball end mill (.040/pass is too coarse)
TRAVYOKE.M Entire harness profile using 1/8" end mill by slot-cutting (slower, harder on tool, a challenge to fixture, untested)

Note: PDF prints may not be as accurate as the original CAD files, which you can download.