4
2.0 Table of contents
Section Page
1.0 IMPORTANT SAFETY INSTRUCTIONS ....................................................................................................... 2
2.0 Table of contents ............................................................................................................................................ 4
3.0 About this manual .......................................................................................................................................... 5
4.0 Specifications ................................................................................................................................................. 6
4.1 Machine dimensions – JTM-1254VS and JTM-1254RVS .......................................................................... 7
4.2 Overview and terminology – JTM-1254VS and JTM-1254RVS ................................................................. 8
5.0 Set-up and assembly ..................................................................................................................................... 9
5.1 Contents of shipping container ................................................................................................................... 9
5.2 Preparing the mill for service ...................................................................................................................... 9
6.0 Electrical connections .................................................................................................................................. 10
6.1 General electrical cautions ....................................................................................................................... 10
6.2 Wire sizes ................................................................................................................................................. 10
6.3 Voltage conversion ................................................................................................................................... 10
7.0 Lubrication .................................................................................................................................................... 11
8.0 Operating instructions .................................................................................................................................. 11
8.1 Operating controls .................................................................................................................................... 11
8.2 Control panel ............................................................................................................................................ 11
8.3 Control positions for milling and drilling operations .................................................................................. 12
8.4 Spindle brake ........................................................................................................................................... 13
8.5 High-low shift lever ................................................................................................................................... 13
8.6 Quill power feed lever ............................................................................................................................... 13
8.7 Feed rate lever ......................................................................................................................................... 13
8.8 Feed trip cam lever ................................................................................................................................... 14
8.9 Spindle speed control ............................................................................................................................... 14
8.10 Feed direction control ............................................................................................................................. 14
8.11 Coarse feed handle ................................................................................................................................ 14
8.12 Quill lock handle ..................................................................................................................................... 14
8.13 Depth scale and stop .............................................................................................................................. 1 4
8.14 Fine feed handwheel .............................................................................................................................. 15
8.15 Automatic feed operation ....................................................................................................................... 15
8.16 Draw bar operation – changing tooling ................................................................................................... 15
8.17 Clamping workpiece to table .................................................................................................................. 16
9.0 Adjustments ................................................................................................................................................. 16
9.1 Mill head – left/right adjustment ................................................................................................................ 16
9.2 Positioning ram ......................................................................................................................................... 17
9.3 Gib adjustment ......................................................................................................................................... 17
9.4 Power feed trip lever mechanism ............................................................................................................. 18
9.5 Table lead screw backlash adjustment .................................................................................................... 18
10.0 User-maintenance ...................................................................................................................................... 20
10.1 Lubrication .............................................................................................................................................. 20
10.2 Periodic maintenance requirements ....................................................................................................... 21
11.0 Recommended speed for mill and drill operations ..................................................................................... 21
12.0 Replacement parts ..................................................................................................................................... 21
12.1.1 JTM-1254VS Upper Head Assembly – Exploded View ...................................................................... 22
12.1.2 JTM-1254VS Upper Head Assembly – Parts List .............................................................................. 23
12.2.1 JTM-1254RVS (R8) Upper Head Assembly – Exploded View ........................................................... 26
12.2.2 JTM-1254RVS (R8) Upper Head Assembly – Parts List .................................................................... 27
12.3.1 JTM-1254VS Lower Head Assembly – Exploded View ...................................................................... 30
12.3.2 JTM-1254VS Lower Head Assembly – Parts List .............................................................................. 31
12.4.1 JTM-1254RVS (R8) Lower Head Assembly – Exploded View ........................................................... 34
12.4.2 JTM-1254RVS (R8) Lower Head Assembly – Parts List .................................................................... 35
12.5.1 JTM-1254VS Base Machine – Exploded View ................................................................................... 38
12.5.2 JTM-1254VS Base Machine – Parts List ............................................................................................ 39
12.6.1 JTM-1254RVS (R8) Base Machine – Exploded View ........................................................................ 41
12.6.2 JTM-1254RVS (R8) Base Machine – Parts List ................................................................................. 42
12.7.1 JTM-1254VS/RVS Table Assembly – Exploded View ........................................................................ 44
12.7.2 JTM-1254VS/RVS Table Assembly – Parts List ................................................................................ 44
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