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used. The left side should have about 8° of relief, and the right side should have about 10° of
relief. The tip of the tool should have a flat that is 1/8 of the thread pitch.
Compound Angle
Set the compound rest at a 29.5° angle from a line perpendicular to the axis of the lathe. This
allows you to advance the tool with the compound rest. At this angle the tool cuts only on the left
side of the thread form. This helps prevent chatter that might result from cutting the entire V
form of the thread at once.
Chris
’
Tip: Use an accurate protractor when setting the compound rest. The scale on the lathe is
not accurate enough.
Setting the Cutting Tool
Even though the compound rest is set at an angle to the work piece, the thread cutting tool must
be set square to the work piece. A center gage makes this setting possible. A center gage has
several V-shaped cutouts. They can be used to check the tool bit as you grind it, and to check the
angle of the tool with respect to the work piece.
To align the tool bit to the work:
1.
Ensure that the point of the tool bit is set at the center height of the lathe.
Summary of Contents for HiTorque 7500
Page 40: ...40 Parts Diagram 7500 Model 7500 drawing 1...
Page 41: ...41 Model 7500 drawing 2...
Page 42: ...42 Parts Diagram 7550 Model 7550 drawing 1...
Page 43: ...43 Model 7550 drawing 2...
Page 47: ...47 Wiring Diagram...
