G code Lathe help with Radius

[B Schein]

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O0000 PROGRAM NUMBER
G20 SET MACHEIN TO INCHES
G0 T0101 TOOL NUMBER AND OFFSET
M8 COLLANT ON
G97 S1000 M03 CONSTANT SURFAGE FOOTAGE SPINDal SPEED CAPED AT 1000 SPINDAL ON CLOCKWISE
G0 G54 X0. Z.1 ABSOLUTE MOVE TO G54 WORK CORDINATE SYSTEM AT XZ CORDINATES
G50 S1000 NEEDED TO SET MAX AND MIN FOR SURFAE FOOTAGE
G96 S700 SPIDAL SPEED 700 RPM LOWER LIMIT
G99 G1 Z0. F.01 INCRANTAL FEED MOVE TO Z0 FEED AT .01 PER REVOLUTION
X1. STILL FEED MOVE
G3 X2. Z-.5 R.5 CCW INPULATON TO XZ CORDINATES USING A RADIUS OF .5
G1 Z-.6 FEED MOVE
X2.1 Z-.6 FEED MOVE
M9 TURN COLLANT OFF
G28 U0. W0. M05 ZERO RETURN COULD ALSO USE X AND Z IN PLACE OF U AND W MOST MACHEINS CAN USE EATHER M5 SPINDAL OFF
T0100 CANCAL TOOL OFFSETS
M30 REWIND AND HOLD
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I added a comintary to the code