3
Table of Contents
Warranty and Service .................................................................................................................................2
Introduction ...............................................................................................................................................7
Specifications ............................................................................................................................................7
Unpacking .................................................................................................................................................8
Contents of the Shipping Container..........................................................................................................8
Set-up and Installation................................................................................................................................9
Preparing the Milling Machine for Service.................................................................................................9
JTM-4VS Dimensions............................................................................................................................... 10
JTM-4VS Overview and Terminology ........................................................................................................ 11
Electrical Connections .............................................................................................................................. 12
General Electrical Cautions ................................................................................................................ 12
Wire Sizes ........................................................................................................................................ 12
Lubrication ........................................................................................................................................... 12
Operating Instructions .............................................................................................................................. 12
Operating Controls ............................................................................................................................... 12
Motor Switch ........................................................................................................................................ 12
Variable Speed Control ......................................................................................................................... 13
Spindle Brake....................................................................................................................................... 14
High-Neutral-Low Shift Lever................................................................................................................. 14
Quill Power Feed Lever......................................................................................................................... 14
Feed Rate Lever................................................................................................................................... 14
Feed Trip Cam Lever ............................................................................................................................ 15
Feed Direction Control .......................................................................................................................... 15
Coarse Feed Handle............................................................................................................................. 15
Quill Lock Lever.................................................................................................................................... 15
Micrometer Adjusting Nut ...................................................................................................................... 15
Fine Feed Handwheel ........................................................................................................................... 15
Depth Scale and Stop ........................................................................................................................... 16
Power Feed Operation .......................................................................................................................... 16
Draw Bar Operation - Changing Tooling ................................................................................................. 17
Clamping Work Piece to the Table ......................................................................................................... 17
Adjustments ............................................................................................................................................ 17
Mill Head – Left/Right Adjustment .......................................................................................................... 17
Mill Head – Fore/Aft Adjustment ............................................................................................................ 18
Positioning the Ram.............................................................................................................................. 19
Positioning the Ram Fore and Aft ....................................................................................................... 19
Positioning the Ram on its Turret........................................................................................................ 19
Gib Adjustment..................................................................................................................................... 19
Adjustment of Knee Gib ..................................................................................................................... 19
Adjustment of Saddle Gib .................................................................................................................. 19
Adjustment of Table Gib .................................................................................................................... 19
Power Feed Trip Lever Mechanism........................................................................................................ 20
Table Lead Screw Backlash Adjustment ................................................................................................ 20
Cross Feed Backlash Adjustment ....................................................................................................... 20
Longitudinal Backlash Adjustment ...................................................................................................... 20
Maintenance............................................................................................................................................ 22
Lubrication ........................................................................................................................................... 22
Periodic Maintenance Requirements .................................................................................................. 22
Replacement of Drive Motor .................................................................................................................. 23
Replacement of Vari-Speed Belt ............................................................................................................ 24
Replacement of Brake Shoes, Springs and/or Timing Belt ....................................................................... 24
Replacement of Quill Feed Clock Spring ................................................................................................ 25
Replacement Parts .................................................................................................................................. 25
Head Assembly .................................................................................................................................... 26
Parts List for Head Assembly ................................................................................................................ 27
Spindle Assembly ................................................................................................................................. 30
Base Assembly .................................................................................................................................... 34
Parts List for Base Assembly ................................................................................................................. 35
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