G4000 9'' x 19'' Lathe -23-
NNOOTTIICCEE
SSlliipp CClluuttcchh::
To avoid overloading the drive, a
safety slip clutch is fitted in the idler pulley.
Overloading the drive at slower speeds (rattling
noise) means the depth of cut is too deep and
should be reduced.
EExxaammppllee ooff GGeeaarr SSeett--UUpp ttoo CCuutt 1100 TT..PP..ll..::
11..
Loosen cap screw
((11))
.
FFiigguurree 3355..
22..
Loosen bolt
((22))
. Remove washers
((33))
and
gear
((66))..
33..
Loosen bolts
((77))
to allow movement in the
center gear position.
44..
Loosen nuts
((55))..
Remove washer
((44))
and
gear
((88))..
RReeaasssseemmbbllee aass ffoolllloowwss::
11..
Install 30 tooth gear in position
((66))
with bush-
ings, washer, and bolt.
22..
Install 60 tooth gear in position
((88))..
33..
Center 127 tooth gear remains in place.
44..
Adjust gear to mesh with upper and lower
gear and tighten bolts
((77))..
TThhrreeaadd CCuuttttiinngg
Several different threads can be cut using the
proper combination of gears and settings. When
cutting inch threads, the half nut and threading
dial are used to thread in a conventional manner.
FFiigguurree 3344..
The thread dial chart specifies at
which point a thread can be entered using the
threading dial.
MMeettrriicc TThhrreeaadd CCuuttttiinngg
- The only difference in
metric thread cutting is,
tthhee hhaallff nnuutt mmuusstt
rreemmaaiinn eennggaaggeedd dduurriinngg tthhee eennttiirree tthhrreeaaddiinngg
pprroocceessss..
The thread dial cannot be utilized.
Set the machine up for the desired thread pitch.
Start the machine and engage the half nut. When
the tool reaches the workpiece, it will cut the ini-
tial threading pass. When the tool reaches the
end of the cut, stop the machine by turning the
motor off and at the same time back the tool out
of the workpiece so that it clears the thread.
DDoo
nnoott
disengage the half nut lever. Reverse the
motor direction to allow the cutting tool to traverse
back to the starting point. Repeat these steps
until you have obtained the desired results.
FFiigguurree 3344..
Half nut and threading dial.
FFiigguurree 3355..
Gear train adjustment points.
55
44
88
44
77
22
33
66
11
