Version is 2.8-pre (download early last month), running the Axis simulator.
Selected tool (#1) is specified as .260" diameter in the tool table.
When I specify G41.1 D0.260, the program accepts the entry.
Complete program attached.

On 10/28/2015 08:30 AM, Jeff Epler wrote:
Can you please say what version of LinuxCNC you are running, and provide
a complete program which illustrates the problem, rather than just a
snippet?  Please also use G41.1 D- instead of G41 so that the program
does not depend on the details of your tool table, or provide the
relevant tool table line.

I converted your example into a complete ngc program and ran it on our
current development version ("2.8.0-pre"), though I expect our current
stable version (2.7.1) to behave the same.  Unfortunately, I failed to
reproduce the problem you report.

Here's my program, which draws the portion of your path offset by 0, 5,
10, 20 and 50mm:

     G21 G40 G90.1  ; note, I assumed this part program is in mm
     F1000

     O<path> sub
         G41.1 D[#1]
         G0X0.0000Y24.8610
         G0Z-17.0000
         M3
         G1X7.5850Y21.5360Z-19.0000
         G1X12.9820Z-19.0000
         G1X24.4020Y11.5920Z-19.0000
         G2X25.8100Y8.5000Z-19.0000I21.7100J8.5000
         G40
     O<path> endsub

     O<path> call [0]
     O<path> call [5]
     O<path> call [10]
     O<path> call [20]
     O<path> call [50]
     M2

All 5 paths show in the preview plot and run successfully using the
sample configuration sim/axis/axis.ini.

Jeff

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G17 G21 G40 G49 G54 G80 G90 G90.1 G94
G21
G40
T1
M6
F100
S2500
G0Z0.0000
G0X60.0000Y20.0000
G0Z-17.0000
(MSG, raise table to touch tool)
M0
G0Z0.0000
G41.1 D0.260
G0X0.0000Y24.8610
G0Z-17.0000
M3 G4 P5.000000
G1X7.5850Y21.5360Z-19.0000
G1X12.9820Z-19.0000
G1X24.4020Y11.5920Z-19.0000
G2X25.8100Y8.5000Z-19.0000I21.7100J8.5000
G1Y0.0000Z-19.0000
G0Z-15.0000
G0Y-12.5000
G1Z-19.0000
G1Y-14.6000Z-19.0000
G1X13.0320Y-21.4000Z-19.0000
G1X-13.0320Z-19.0000
G1X-25.8100Y-14.6000Z-19.0000
G1Y-12.5000Z-19.0000
G0Z-15.0000
G0Y0.0000
G1Z-19.0000
G1Y8.5000Z-19.0000
G2X-24.4020Y11.5920Z-19.0000I-21.7100J8.5000
G1X-12.9820Y21.5360Z-19.0000
G1X-7.5850Z-19.0000
G1X7.5850Y21.5360Z-21.8333
G1X12.9820Z-21.8333
G1X24.4020Y11.5920Z-21.8333
G2X25.8100Y8.5000Z-21.8333I21.7100J8.5000
G1Y0.0000Z-21.8333
G0Z-15.0000
G0Y-12.5000
G1Z-21.8333
G1Y-14.6000Z-21.8333
G1X13.0320Y-21.4000Z-21.8333
G1X-13.0320Z-21.8333
G1X-25.8100Y-14.6000Z-21.8333
G1Y-12.5000Z-21.8333
G0Z-15.0000
G0Y0.0000
G1Z-21.8333
G1Y8.5000Z-21.8333
G2X-24.4020Y11.5920Z-21.8333I-21.7100J8.5000
G1X-12.9820Y21.5360Z-21.8333
G1X-7.5850Z-21.8333
G1X7.5850Y21.5360Z-24.6667
G1X12.9820Z-24.6667
G1X24.4020Y11.5920Z-24.6667
G2X25.8100Y8.5000Z-24.6667I21.7100J8.5000
G1Y0.0000Z-24.6667
G0Z-15.0000
G0Y-12.5000
G1Z-24.6667
G1Y-14.6000Z-24.6667
G1X13.0320Y-21.4000Z-24.6667
G1X-13.0320Z-24.6667
G1X-25.8100Y-14.6000Z-24.6667
G1Y-12.5000Z-24.6667
G0Z-15.0000
G0Y0.0000
G1Z-24.6667
G1Y8.5000Z-24.6667
G2X-24.4020Y11.5920Z-24.6667I-21.7100J8.5000
G1X-12.9820Y21.5360Z-24.6667
G1X-7.5850Z-24.6667
G1X7.5850Y21.5360Z-27.5000
G1X12.9820Z-27.5000
G1X24.4020Y11.5920Z-27.5000
G2X25.8100Y8.5000Z-27.5000I21.7100J8.5000
G1Y0.0000Z-27.5000
G0Z-15.0000
G0Y-12.5000
G1Z-27.5000
G1Y-14.6000Z-27.5000
G1X13.0320Y-21.4000Z-27.5000
G1X-13.0320Z-27.5000
G1X-25.8100Y-14.6000Z-27.5000
G1Y-12.5000Z-27.5000
G0Z-15.0000
G0Y0.0000
G1Z-27.5000
G1Y8.5000Z-27.5000
G2X-24.4020Y11.5920Z-27.5000I-21.7100J8.5000
G1X-12.9820Y21.5360Z-27.5000
G1X-7.5850Z-27.5000
G1X7.5850Y21.5360Z-30.3333
G1X12.9820Z-30.3333
G1X24.4020Y11.5920Z-30.3333
G2X25.8100Y8.5000Z-30.3333I21.7100J8.5000
G1Y0.0000Z-30.3333
G0Z-15.0000
G0Y-12.5000
G1Z-30.3333
G1Y-14.6000Z-30.3333
G1X13.0320Y-21.4000Z-30.3333
G1X-13.0320Z-30.3333
G1X-25.8100Y-14.6000Z-30.3333
G1Y-12.5000Z-30.3333
G0Z-15.0000
G0Y0.0000
G1Z-30.3333
G1Y8.5000Z-30.3333
G2X-24.4020Y11.5920Z-30.3333I-21.7100J8.5000
G1X-12.9820Y21.5360Z-30.3333
G1X-7.5850Z-30.3333
G1X7.5850Y21.5360Z-33.1667
G1X12.9820Z-33.1667
G1X24.4020Y11.5920Z-33.1667
G2X25.8100Y8.5000Z-33.1667I21.7100J8.5000
G1Y0.0000Z-33.1667
G0Z-15.0000
G0Y-12.5000
G1Z-33.1667
G1Y-14.6000Z-33.1667
G1X13.0320Y-21.4000Z-33.1667
G1X-13.0320Z-33.1667
G1X-25.8100Y-14.6000Z-33.1667
G1Y-12.5000Z-33.1667
G0Z-15.0000
G0Y0.0000
G1Z-33.1667
G1Y8.5000Z-33.1667
G2X-24.4020Y11.5920Z-33.1667I-21.7100J8.5000
G1X-12.9820Y21.5360Z-33.1667
G1X-7.5850Z-33.1667
G1X7.5850Y21.5360Z-36.0000
G1X12.9820Z-36.0000
G1X24.4020Y11.5920Z-36.0000
G2X25.8100Y8.5000Z-36.0000I21.7100J8.5000
G1Y0.0000Z-36.0000
G0Z-15.0000
G0Y-12.5000
G1Z-36.0000
G1Y-14.6000Z-36.0000
G1X13.0320Y-21.4000Z-36.0000
G1X-13.0320Z-36.0000
G1X-25.8100Y-14.6000Z-36.0000
G1Y-12.5000Z-36.0000
G0Z-15.0000
G0Y0.0000
G1Z-36.0000
G1Y8.5000Z-36.0000
G2X-24.4020Y11.5920Z-36.0000I-21.7100J8.5000
G1X-12.9820Y21.5360Z-36.0000
G1X-7.5850Z-36.0000
G0Z-17.0000
G1X0.0000Z-18.5000
G1X18.0180Y21.5360Z-18.5000
G2X18.0640Y-21.4000Z-18.5000I-45.1900J0.0000
G0Z-15.0000
G0X-18.0640
G1Z-18.5000
G2X-18.0180Y21.5360Z-18.5000I45.1900J0.0000
G0Z-15.0000
G0X10.0000
G1X12.9820Z-18.5000
G2X13.0320Y-21.4000Z-18.5000I-45.1900J0.0000
G0Z-15.0000
G0X-10.0000
G1X-13.0320Z-18.5000
G2X-12.9820Y21.5360Z-18.5000I45.1900J0.0000
G0Z-15.0000
G0X0.0000
G1X0.0000Z-19.7500
G1X18.0180Y21.5360Z-19.7500
G2X18.0640Y-21.4000Z-19.7500I-45.1900J0.0000
G0Z-15.0000
G0X-18.0640
G1Z-19.7500
G2X-18.0180Y21.5360Z-19.7500I45.1900J0.0000
G0Z-15.0000
G0X10.0000
G1X12.9820Z-19.7500
G2X13.0320Y-21.4000Z-19.7500I-45.1900J0.0000
G0Z-15.0000
G0X-10.0000
G1X-13.0320Z-19.7500
G2X-12.9820Y21.5360Z-19.7500I45.1900J0.0000
G0Z-15.0000
G0X0.0000
G1X0.0000Z-21.0000
G1X18.0180Y21.5360Z-21.0000
G2X18.0640Y-21.4000Z-21.0000I-45.1900J0.0000
G0Z-15.0000
G0X-18.0640
G1Z-21.0000
G2X-18.0180Y21.5360Z-21.0000I45.1900J0.0000
G0Z-15.0000
G0X10.0000
G1X12.9820Z-21.0000
G2X13.0320Y-21.4000Z-21.0000I-45.1900J0.0000
G0Z-15.0000
G0X-10.0000
G1X-13.0320Z-21.0000
G2X-12.9820Y21.5360Z-21.0000I45.1900J0.0000
G0Z-15.0000
G0X0.0000
G0Z0.0000
G40
T2
M6
G0Z0.0000
G0X60.0000Y20.0000
G0Z-17.0000
(MSG, raise table to touch tool)
M0
G0Z0.0000
G0X0.0000Y24.8610
G41
G0Z-17.0000
M3 G4 P5.000000
G1X7.5850Y21.5360Z-19.0000
G1X12.9820Z-19.0000
G1X24.4020Y11.5920Z-19.0000
G2X25.8100Y8.5000Z-19.0000I21.7100J8.5000
G1Y0.0000Z-19.0000
G0Z-15.0000
G0Y-12.5000
G1Z-19.0000
G1Y-14.6000Z-19.0000
G1X13.0320Y-21.4000Z-19.0000
G1X-13.0320Z-19.0000
G1X-25.8100Y-14.6000Z-19.0000
G1Y-12.5000Z-19.0000
G0Z-15.0000
G0Y0.0000
G1Z-19.0000
G1Y8.5000Z-19.0000
G2X-24.4020Y11.5920Z-19.0000I-21.7100J8.5000
G1X-12.9820Y21.5360Z-19.0000
G1X-7.5850Z-19.0000
G1X7.5850Y21.5360Z-21.8333
G1X12.9820Z-21.8333
G1X24.4020Y11.5920Z-21.8333
G2X25.8100Y8.5000Z-21.8333I21.7100J8.5000
G1Y0.0000Z-21.8333
G0Z-15.0000
G0Y-12.5000
G1Z-21.8333
G1Y-14.6000Z-21.8333
G1X13.0320Y-21.4000Z-21.8333
G1X-13.0320Z-21.8333
G1X-25.8100Y-14.6000Z-21.8333
G1Y-12.5000Z-21.8333
G0Z-15.0000
G0Y0.0000
G1Z-21.8333
G1Y8.5000Z-21.8333
G2X-24.4020Y11.5920Z-21.8333I-21.7100J8.5000
G1X-12.9820Y21.5360Z-21.8333
G1X-7.5850Z-21.8333
G1X7.5850Y21.5360Z-24.6667
G1X12.9820Z-24.6667
G1X24.4020Y11.5920Z-24.6667
G2X25.8100Y8.5000Z-24.6667I21.7100J8.5000
G1Y0.0000Z-24.6667
G0Z-15.0000
G0Y-12.5000
G1Z-24.6667
G1Y-14.6000Z-24.6667
G1X13.0320Y-21.4000Z-24.6667
G1X-13.0320Z-24.6667
G1X-25.8100Y-14.6000Z-24.6667
G1Y-12.5000Z-24.6667
G0Z-15.0000
G0Y0.0000
G1Z-24.6667
G1Y8.5000Z-24.6667
G2X-24.4020Y11.5920Z-24.6667I-21.7100J8.5000
G1X-12.9820Y21.5360Z-24.6667
G1X-7.5850Z-24.6667
G1X7.5850Y21.5360Z-27.5000
G1X12.9820Z-27.5000
G1X24.4020Y11.5920Z-27.5000
G2X25.8100Y8.5000Z-27.5000I21.7100J8.5000
G1Y0.0000Z-27.5000
G0Z-15.0000
G0Y-12.5000
G1Z-27.5000
G1Y-14.6000Z-27.5000
G1X13.0320Y-21.4000Z-27.5000
G1X-13.0320Z-27.5000
G1X-25.8100Y-14.6000Z-27.5000
G1Y-12.5000Z-27.5000
G0Z-15.0000
G0Y0.0000
G1Z-27.5000
G1Y8.5000Z-27.5000
G2X-24.4020Y11.5920Z-27.5000I-21.7100J8.5000
G1X-12.9820Y21.5360Z-27.5000
G1X-7.5850Z-27.5000
G1X7.5850Y21.5360Z-30.3333
G1X12.9820Z-30.3333
G1X24.4020Y11.5920Z-30.3333
G2X25.8100Y8.5000Z-30.3333I21.7100J8.5000
G1Y0.0000Z-30.3333
G0Z-15.0000
G0Y-12.5000
G1Z-30.3333
G1Y-14.6000Z-30.3333
G1X13.0320Y-21.4000Z-30.3333
G1X-13.0320Z-30.3333
G1X-25.8100Y-14.6000Z-30.3333
G1Y-12.5000Z-30.3333
G0Z-15.0000
G0Y0.0000
G1Z-30.3333
G1Y8.5000Z-30.3333
G2X-24.4020Y11.5920Z-30.3333I-21.7100J8.5000
G1X-12.9820Y21.5360Z-30.3333
G1X-7.5850Z-30.3333
G1X7.5850Y21.5360Z-33.1667
G1X12.9820Z-33.1667
G1X24.4020Y11.5920Z-33.1667
G2X25.8100Y8.5000Z-33.1667I21.7100J8.5000
G1Y0.0000Z-33.1667
G0Z-15.0000
G0Y-12.5000
G1Z-33.1667
G1Y-14.6000Z-33.1667
G1X13.0320Y-21.4000Z-33.1667
G1X-13.0320Z-33.1667
G1X-25.8100Y-14.6000Z-33.1667
G1Y-12.5000Z-33.1667
G0Z-15.0000
G0Y0.0000
G1Z-33.1667
G1Y8.5000Z-33.1667
G2X-24.4020Y11.5920Z-33.1667I-21.7100J8.5000
G1X-12.9820Y21.5360Z-33.1667
G1X-7.5850Z-33.1667
G1X7.5850Y21.5360Z-36.0000
G1X12.9820Z-36.0000
G1X24.4020Y11.5920Z-36.0000
G2X25.8100Y8.5000Z-36.0000I21.7100J8.5000
G1Y0.0000Z-36.0000
G0Z-15.0000
G0Y-12.5000
G1Z-36.0000
G1Y-14.6000Z-36.0000
G1X13.0320Y-21.4000Z-36.0000
G1X-13.0320Z-36.0000
G1X-25.8100Y-14.6000Z-36.0000
G1Y-12.5000Z-36.0000
G0Z-15.0000
G0Y0.0000
G1Z-36.0000
G1Y8.5000Z-36.0000
G2X-24.4020Y11.5920Z-36.0000I-21.7100J8.5000
G1X-12.9820Y21.5360Z-36.0000
G1X-7.5850Z-36.0000
G40
G0Z0.0000
G0Z0.0000
T3
M6
M5
G0X60.0000Y20.0000Z-17.0000
M0
M3 G4 P5.000000
G0X-10.0000
G73X-21.7100Y8.5000Z-38.0000R-10.0000Q2.0000
G0X-10.0000
G73X21.7100Y8.5000Z-38.0000R-10.0000Q2.0000
M2
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