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BENCH BLOCK
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TERMINOLOGY
 F.I.M.
- Full Indicator Movement
 RPM - Revolutions Per Minute
 A.I.S.I. - American Iron & Steel Institute
 4140 - Last two digits represent % of
carbon
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EQUIPMENT
Building this bench block will give
you experience using:
Lathe
Bandsaw
Vertical
Heat
Mill
Horizontal Mill
Treat Oven
Surface Grinder
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DRAW THIS PART
1/4”
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.500
1/4”
CBC Machine
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CBC
1.000
+- .005
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PROCEDURE - SAW
 Cutoff
2-3/4” diameter x 1-1/4” long
A.I.S.A. tool steel.
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PROCEDURE - LATHE
 Chuck
in lathe, in four jaw chuck
 Indicate to within .015 F.I.M.
 Face to cleanup surface at 80 RPM.
 Turn OD to 2.450+- .005”.
 Turn OD to 2.450+- .005 x1/4” from face.
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PROCEDURE - LATHE
 Check
if there is time to :
 Center drill.
 Drill 1/2” hole thru at 400 RPM.
 Turn ID to 2.00+-.010” x3/8” deep at
100 RPM.
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PROCEDURE - LATHE
 Remove
turn part around rechuck on
1/4” shoulder and indicate to .002” F.I.M.
 Face to 1.020+- .005 at 80 RPM.
 Turn OD to 2.400+- .005 x 1/4”from face.
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HORIZONTAL MILL
 Setup
in vice on parallels, leave 3/8”
minimum above vice .
 Setup 90 cutter on arbor.
 Position center of cutter in center of
workpiece.
 Touch rotating cutter to top of workpiece.
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HORIZONTAL MILL
 Take
two cuts, .125 deep each at 80
RPM.
 remove 90 cutter, replace with 1/8”
cutter.
 Center cutter in center of grove.
 Make one cut 1/8” deep.
CBC Machine
Machine Technology
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CBC