3. Write the word l hole drill 15 mm ? through C/bore 20 mm ?? 6 mm deep Mili 12

Question

3. Write the word l hole drill 15 mm ? through C/bore 20 mm ?? 6 mm deep Mili 12-mm-wide slot x 12 mm deep Mill 12-mm-wide slot address program (G Code) to machine (centering, drilling, reaming and counter-boring of the holes and slotting only. No peripheral cutting.) the part given below. Select the appropriate tools (diameter and type) as well as feed and speed values and cutting conditions such as use of coolant. Assume the part material is normalized annealed brass plate with 20 mm thickness 5 mm deep 4 holes drill 5 mm ? and tap M6 x 8 mm deep 50 10 rad 50 49 120 80 81 40 30.75 28 20 56 Program datum point 84 118 137 225 Material: mild steel All dimensions in mm

Explanation / Answer

% (start of program)

N01 G21 G90 G94 T01 F100 S1000 (specifies mm unit, absolute dimension, and feed rate in mm/rev, tool 1 as milling tool of 12mm diameter, feed, spindle speed)

N02 G92 X 0.0 Y 0.0 Z 2.0 (zero preset with the tool above the material by 2mm)

N03 G00 X 175.0 Y 180.0 Z 2.0 (positioning the tool for the top of the right hand side cutting)

N04 G78 X 175.0 Y 180.0 Z -20.0 M07 M03 (milling operation starts with z= -20 which is the thickness of the material with spindle clockwise)

N05 G78 Y140.0

N06 G03 X 175.0 Y 140.0 X 185.0 Y 130.0 R10 (circular arc with counter clock wise motion of the milling machine)

N07 G79 X 225.0

N08 G80 X 225.0 Y 130.0 Z 2.0 (cycle cancelled and again the tool is been raised to the height above the material by 2mm)

N09 G00 X 118.0 Y180.0 Z 2.0 (for slot cutting the tool is now positioned)

N10 G78 X 118.0 Y 180.0 Z-12.0 (milling starts creating the slot)

N11 G79 Y 0.0

N12 G80 X 118.0 Y0.0 Z2.0 (cycle cancelled for next operation)

N13 G00 X137.0 Y180.0 Z2.0 (rapid traverse)

N13 G78 X137.0 Y180.0 Z-12.0 (milling starts creating the slot)

N14 G79 Y 99.0

N15 G78 X 205.0 Y 30.75 (angle slot)

N16 G80 X 0.0 Y0.0 Z2.0 M05 (cycle cancelled and spindle is off)

N17 M06 T02 F50 S500 EOB (next tool T02 i.e. drilling tool of size 5mm)

N18 G81 X28.0 Y 40.0 Z -20.0 M03

N19 G81 X28.0 Y 120.0 Z -20.0

N20 G81 X84.0 Y 40.0 Z -20.0

N21 G81 X84.0 Y 120.0 Z -20.0

N22 G80 M05 M06 T03 F80 S100 (next tool T03 i.e. tapping tool with 6mm dia)

N23 G84 X28.0 Y 40.0 Z -8.0 M03 (tapping done upto depth of 8mm)

N24 G84 X28.0 Y 120.0 Z -8.0

N25 G84 X84.0 Y 40.0 Z -8.0

N26 G84 X84.0 Y 120.0 Z -8.0

N27 G80 M05 M06 T04 F100 S800

N28 G81 X 56.0 Y 80.0 Z -20.0 M03

N29 G80 M05 M06 T05 F80 S500 (COUNTER BORING TOOL OF 20mm)

N30 G87 X56.0 Y80.0 Z -6.0 M03 (COUNTER boring is done up to 6mm with spindle rotating in clock wise )

N31 G80 M05 M09 M02

NOTE: Here the speed of the spindle and feed are assumed values and the tool is of proper size for constructing the design

DON'T GET CONFUSED WITH G78 AND G79 .- It can be used alternatively when moving in different planes for next cuts.

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