5
13.5.3 Rear Gear Box Assembly – Parts List ................................................................................................. 36
13.6.1 Electrical Box – Exploded View ........................................................................................................... 37
13.6.2 Electrical Box – Parts List .................................................................................................................... 37
14.0 Electrical Connections for J-720R .............................................................................................................. 38
14.1 Electrical Connections for J-720R – Parts List ....................................................................................... 39
15.0 Warranty and Service ................................................................................................................................. 40
3.0
About this machine
The JET Model J-720R is a powerful and versatile radial arm drill press. The drill head is mounted on an arm
and can slide along the arm to position the spindle over the work piece. The arm itself can be rotated on its
support column to allow centering the spindle over the work piece.
Drilling can be performed manually or with power feed assistance. In addition, parameters of RPM, power feed
rate and drilling depth can be pre-set by the operator, using controls conveniently positioned on the drill head.
The power train gears and spline shaft are made of high quality heat-treated and ground nickel chrome steel,
offering greater strength and smoothness to high-torque loads. The spindle is of case hardened steel and
supported by dual row taper roller and thrust ball bearings at the nose, with thrust and axial bearings at the top.
The frame is made of Meehanite® and high-tensile strength cast iron.
A precision machined box table allows convenient positioning and clamping of smaller work pieces. The box
table can be removed from the base to allow larger work pieces to be clamped on the base itself. Both table
and base have multiple T-slots for clamping set-ups.
Summary of Contents for J-720R
Page 9: ...9 General Features and Terminology cont Figure 5 2 ...
Page 14: ...14 7 0 Operating Controls J720R Figure 7 1 Operating Controls ...
Page 23: ...23 Figure 12 1 Figure 12 2 Figure 12 3 Figure 12 4 Figure 12 5 ...
Page 27: ...27 13 3 1 Base Column and Arm Assemblies Exploded View ...
Page 30: ...30 13 4 1 Gear Box Assembly Exploded View ...
Page 34: ...34 13 5 1 Rear Gear Box Assembly I Exploded View ...
Page 35: ...35 13 5 2 Rear Gear Box Assembly II Exploded View ...
