Cutting Short Tapers - OTMT SC4 User Manual And Installation Manual

Cutting Short Tapers

Short tapers, or bevels,
advancing the tool using the compound
slide.The compound is rotated and locked into
position such that the cutting tool moves
outward (away from the bed) at a selected
angle. For the following exercise, we will cut a
20 taper on the end of the workpiece used for
the previous exercises.
Setup for bevel cutting
1. Move the tailstock all the way to the right
end of the ways and remove the tailstock
chuck to provide maximum working room
for the following procedure.
2. Use a 4mm hex wrench to loosen the two
cap head
compound. (Note: if one of the gib screws
is over the
compound-slide in or out until the cap
screw is accessible.)
3. Rotate
counterclockwise until the 20 position on
the scale is in line with the small index
mark at the front of the protractor.
4. Lock the compound in this position by
tightening the two 4mm cap head screws.
5. Loosen the toolpost locking handle and
rotate the toolpost so that the tip of the tool
is pointing towards the workpiece and the
back edge of the toolpost is parallel with
the edge of the compound slide. Lock the
toolpost in this position.
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screws that secure
cap screw, move
the compound
6. Use the carriage handwheel and cross-
slide handwheel to position the tip of the
cutting tool near to the edge of the
by workpiece and drawn back about ½"
towards the center of the workpiece face.
7. Lock the carriage in place.
8. Make sure that the work area around the
chuck is clear of any tools or shards of
material that might pose a hazard.
9. Press the Start button and adjust the
spindle speed to about 800 RPM.
10. Turn the compound handwheel clockwise,
advancing the tip of the cutting tool towards
the edge of the workpiece.
11. If necessary, adjust the position of the tool
using the cross-slide handwheel so that the
tool is at a cutting depth of about 1/16".
12. Continue
handwheel to make a cut diagonally across
the edge of the workpiece. The tool should
leave a beveled edge on the workpiece.
13. Rotate the compound handwheel counter-
clockwise to withdraw the tool back past
the
the edge of the workpiece.
the
14. Advance the cross-slide handwheel by 10
divisions.
15. Repeat steps 10-14 until the beveled
surface is about ¼" wide.
slide
16. Take 2 or 3 light finish cuts to leave a
smooth even bevel on the workpiece.
17. Press the Stop button
18. Unlock the carriage and move the carriage
clear of the workpiece
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to advance the compound