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Introduction
This manual is provided by JET, covering the safe operation and maintenance procedures for a JET Model
JTM-4VS Turret Milling Machine. This manual contains instructions on installation, safety precautions, general
operating procedures, maintenance instructions and parts breakdown. This machine has been designed and
constructed to provide years of trouble free operation if used in accordance with instructions set forth in this
manual. If there are any questions or comments, please contact either your local supplier or JET. JET can also
be reached at our web site: www.jettools.com.
Specifications
Model Number ..................................................................... JTM-4VS-1 ............................................. JTM-4VS-3
Stock Number ............................................................................ 690180 .................................................. 690182
Spindle Taper .................................................................................. R-8 ......................................................... R-8
Diameter of Quill (in.) .................................................................... 3.375 ...................................................... 3.375
Number of Spindle Speeds........................................................ Variable .................................................. Variable
Range of Spindle Speeds (RPM) ............................................60 to 4200 ............................................... 60 to 4200
Downfeeds per Revolution of Spindle (in.) ............. 0.0015, 0.003, 0.006 ............................... 0.0015, 0.003, 0.006
Spindle Travel (in.) ............................................................................... 5 ............................................................. 5
Head Movement – Left and Right (deg.) ............................................. 90 ........................................................... 90
Head Movement – Fore and Aft (deg.)................................................ 45 ........................................................... 45
Maximum Distance Spindle to Table (in.)...................................... 17-1/2 ..................................................... 17-1/2
Maximum Distance Spindle to Column (in.) ........................................ 19 ........................................................... 19
Minimum Distance Spindle to Column (in.) ..................................... 4-1/2 ....................................................... 4-1/2
Collet Capacity (in.) .................................................................. 1/8 – 7/8 ..................................................1/8 – 7/8
Table Size (in.) ..............................................................................9 x 49 ...................................................... 9 x 49
Longitudinal Table Travel, maximum (in.) ........................................... 34 ........................................................... 34
Table Cross Travel, maximum (in.) ..................................................... 12 ........................................................... 12
Number of T-Slots ................................................................................ 3 ............................................................. 3
T-Slot Size (WxD)(in.) ............................................................... 5/8 x 3/4 .................................................. 5/8 x 3/4
T-Slot Centers (in.) ......................................................................... 2-1/2 ....................................................... 2-1/2
Table Load, maximum (lbs.) ............................................................. 660 ........................................................ 660
Knee Travel, maximum (in.) ......................................................... 14-1/2 ..................................................... 14-1/2
Ram Travel, maximum (in.) .......................................................... 13-3/8 ..................................................... 13-3/8
Overall Dimensions (in.) .............................................. 66W x 63D x 85H .................................... 66W x 63D x 85H
Motor ................................................. TEFC 2HP, 1PH, 115/230V, 60Hz .......... TEFC 3 HP, 3PH, 230/460V, 60Hz
(prewired 230V) (prewired 230V)
Net Weight, approx. (lbs.) .............................................................. 2,420 ...................................................... 2,420
The above specifications were current at the time this manual was published, but because of our policy of
continuous improvement, JET reserves the right to change specifications at any time and without prior notice,
without incurring obligations.