Jet GHD-25, Operating Instructions Manual

Page: 23 / 38

Operation Manual
Total 2
1
page
19
7.3 Changes for the spindle speed:
Spindle speed change could be made by moving the two levers ( 10 ) and ( 11 ) located in
the front of the spindle box. Relations between spindle speed revolution and levers position
is indicated at the speed change label. Meanwhile, the digital meter indicates the actual
spindle revolution.
As mounting or dismounting tool cutter or adjustment of work piece needs spindle rotation by
manual, therefore, the lever in the right side position shall be in the “idle” position, so spindle
rotation could be easily obtained.
7.4 Operation of the spindle feed:
The machine is adopted manual feed, at the right side of the spindle box, there are three
feed
levers ( 2 ), The spindle will move down if turned the lever one of any three feed levers in counter clockwise
direction. The spindle will move up if turned the lever in clockwise direction
.
7.5 Cutting depth control:
For the batch production, you need control cutting depth. A scale in front of spindle box could
meet your requirements. Loosening knurled screw ( 13 ) by turning knob ( 1 ), moving the
scale to the required depth, then fastening the knurled screw( 13 ). Now the machining depth
could be controlled.
7.6 Tapping
Turn the feed lever ( 2 ) and let the tap approaches the work piece shall be exerted in order to
let the tap comes into the hole. Promptly start the reverse button (7) when the screw depth is
reached, the spindle rotates in reversion ,push the tap out of work piece with a little force and,
then once tapping operation finished.
8. Machine adjustment:
8.1 Spindle balance force adjustment:
Balance of spindle is realized through a springiness from a coil spring device located at the left
side of the spindle box. Balance force shall be adjusted to the point that the spindle together
with its tool shall not go down itself when spindle stops. (go up a little bit shall be much
better). Over springiness or less needs adjustment. Simply loosening the screw on the cover of
spring box, turn the spring box cover, the spring could be either fastening or loosening.
Fastening screw on the cover if the balance force is ok.