Spinning Top
1.
Introduction
3.
Spinner Body
4.
Spinner Mass
5.
Assembly
This document is intended to
explain the manufacturing sequence for a Spinning Top. All tools needed to make
the top are located in the Spinning Top Tackle Box.
Important Notes [RETURN TO TOP]
1.
Material Selection: Use
the ½ AL rod from the material rack for the Spinner Body. Use the 1 brass rod
on the cart by the office to make the Spinner Mass.
2.
Parting Off: If
you have not been trained to part off, ask Mike or another trained TA to
perform the part off with you.
3.
Loading Tools into Tool Lathe Tool Holders: Seek assistance from a senior TA or Mike
regarding tool installation.
4.
Make sure to check tool center
height EVERYTIME you change tools. Failing to do this will result in broken tooling.
1.
Cut a piece
of ½ AL rod to at least 1.5 in length using the Marvel or Rollin bandsaw
2.
Clamp the workpiece
in a ½ collet chuck with at least 1 of material protruding from the chuck
a.
NOTE:
Measure the work piece to ensure it is within the tolerance required for a
collet chuck. If it is not it could permanently damage the collet
3.
With the
lathe turned off, adjust the headstock federate controls to 0.002/rev
4.
Face 0.010
from the stock and re-zero
5.
Turn the OD
to 0.4840 by removing 0.0040 from the diameter (0.002 radial depth of cut)
at a time, and measure with micrometers after each pass
a.
NOTE:
Its important to write down how much each cut removes so you can average
material removed and know what to expect for your final pass
6.
Drill and
ream the center hole to the correct depth
7.
Set the
compound rest to 35°, and cut the taper to size by adjusting the x axis 0.050
at a time
a.
NOTE:
If you have not cut a taper on the lathe before, seek assistance from an
experienced TA
8.
Remove the
part, and clamp on the 0.4840 OD using a 31/64 collet
a.
NOTE:
Measure the work piece to ensure it is within the tolerance required for a
collet chuck. If it is not it could permanently damage the collet.
9.
Face 0.010
from the stock
10. Center drill with a #2 center drill to a
depth at least halfway up the taper of the drill
a.
NOTE:
This is so a live center can be used. If unfamiliar with live centers, read the
Live & Dead Center Section of the TA Information Archive, and
afterwards consult Mike or a senior TA.
11. Load a live center into the tailstock
12. After sliding the tailstock forward and
activating the break, rotate the quill handle until the live center comes into
contact with the part, then activate the quill lock.
a.
NOTE:
Be careful not to apply too much force to the part using the quill handle,
which can push the part farther into the collet.
13. Using the VNMG 332 turning and facing tool,
turn the shoulder to size
14. Knurl the 0.3125 OD
a.
NOTE:
If you have never knurled before, consult Mike or an older TA for correct
technique, speeds, and feeds.
15. Cut the grooves using a 0.050 grooving tool
a.
NOTE:
Ensure the tool is parallel with the X axis prior to cutting using the 1-2-3
block. If you have never done this before please consult Mike or an older TA.
This is a crucial step and the cutting tool WILL break if this is not done
correctly
b.
NOTE:
Check/Set the extension of the grove such that is the correct length (which
maximizes rigidity, yet has clearance from the part)
c.
NOTE:
Seek assistance from Mike or senior TA regarding zeroing the tool
16. Remove the tailstock and face the part to
length, using light depths of cut (~0.020) to minimize part deflection
1.
Clamp on the
1 brass rod using a 1 collet.
a.
NOTE:
Start with the speed turned all the way down, and slowly increase until you
reach 600 RPM. If you can hear or feel the stock whipping in the spindle, turn
the speed down until it stops.
b.
NOTE:
Measure the work piece to ensure it is within the tolerance required for a
collet chuck. If it is not it could permanently damage the collet
2.
Face 0.010
from the stock and turn the OD to size
3.
Cut the
first fillet using the 1/8 fillet tool
a.
NOTE:
Ensure the tool is parallel with the X axis prior to cutting using the 1-2-3
block.
4.
Part off the
workpiece 0.010 oversize
a.
NOTE:
Reference the Parting
Tool Notes document and seek assistance from a trained TA when using a
parting tool.
5.
Clamp on the
workpiece using a 63/64 collet
a.
NOTE:
Measure the work piece to ensure it is within the tolerance required for a
collet chuck. If it is not it could permanently damage the collet
6.
Follow the Boring
on the Lathe document for proper boring bar selection, setup, and use.
a.
NOTE:
If you have never used a boring bar on the lathe before consult Mike or an
older TA
1.
Using a vise
and the premade tools in the tackle box, press the Spinner Mass onto the
Spinner body so that the fillet and taper are on the same side. Ensure that the
face of the filleted side is flush with the top edge of the taper.
2.
Clamp on
0.050 to 0.100 of the Spinner Masss OD, and finish the shoulder to make the
two surfaces flush with each other.
3.
Cut the
second fillet using the 1/8 fillet tool
4.
Remove the
assembly from the collet chuck, and support it on the top edges of a vise.
Place one of the 1/8 ball bearing in the hole, and lightly tap it into place
with a dead blow.
5.
Polish J