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Summary of Contents for Jet J-720R
- Page 1 This .pdf document is bookmarked Operating Instructions and Parts Manual 3-ft. Radial Arm Drill Press Model J-720R 427 New Sanford Road LaVergne, Tennessee 37086 Part No. M-320033 Ph.: 800-274-6848 Revision H1 06/2019 www.jettools.com Copyright © 2019 JET...
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Page 2: Important Safety Instructions
Used properly, 13. Keep work area clean. Cluttered areas invite JET machinery is among the best in design and accidents. safety. However, any machine used improperly can 14. Remove adjusting keys and wrenches before be rendered inefficient and unsafe. - Page 3 Always use the correct tooling. Tooling shall handling any sharp objects or cutting tools. See always be maintained and properly sharpened. Figure A. All tooling must be run at the proper speeds and Always wear protective eye wear when operating, feeds as they apply to the job.
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Page 4: Table Of Contents
9.3 Feed lever/clutch engagement ......................... 20 9.4 Spindle travel range ..........................20 10.0 Spindle Speed Chart ..........................21 11.0 Troubleshooting J-720R Radial Drill Press ....................21 12.0 User-maintenance ............................22 12.1 General Cleaning ........................... 22 ... -
Page 5: About This Machine
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. -
Page 6: Specifications
L = length, W = width, H = height The specifications in this manual were current at time of publication, 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. -
Page 7: Machine Environment
Peak value: 200% or less than the line voltage of the actual value (rms.value). Duration: 1.5m.sec or less. Acceptable AC voltage of the waveform distortion. Acceptable imbalance of the line voltage: 5% or less. 4.3 Overall Dimensions, J-720R Figure 4-1... -
Page 8: General Features And Terminology
5.0 General Features and Terminology Figure 5-1 Arm Elevating Motor 15. Arm Rotation Handle Elevating Worm Gear Reducer 16. Box Table Top Cap 17. Handwheel (horizontal head travel) Column 18. Spindle Elevating Ball Screw 19. Coolant Nozzle Locking Handle (x2) 20. - Page 9 General Features and Terminology (cont.) Figure 5-2...
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Page 10: Set-Up And Assembly
6.0 Set-Up and Assembly 6.1 Floor Diagrams for J-720R Figure 6-1 Figure 6-1 shows spacing for the 360° rotational path of the arm, plus 1000mm (approx. 40 inches) of general maintenance area on each side. Distance column center to arm limit... -
Page 11: Unpacking
Contents of Shipping Container 6.2 Unpacking (Figure 6-3) Remove any remnants of the shipping crate and check for shipping damage. Report any damage Radial Arm Drill Press (not shown) immediately to your distributor and shipping agent. Leveling Pads Do not discard any shipping material until the Tool Box, containing: Radial Arm Drill Press is installed and running Grease gun... -
Page 12: Machine Set-Up
This machine must be properly grounded to help prevent electrical shock and possible fatal Remove bolts holding machine to pallet. injury. Model J-720R radial drills are tested before All lifting equipment must shipping, for all functions and circuits under be rated appropriately to safely sustain the electrical power specified for the machine and weight of the drill press. - Page 13 6.4.4 Converting from 230V to 460V disconnect from the branch circuit when working The J-720R is prewired for 230 volt. To convert to with tooling on the machine. 460 volt input: It is recommended that the 230 volt Drill Press be...
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Page 14: Operating Controls, J720R
7.0 Operating Controls, J720R Figure 7-1 Operating Controls... -
Page 15: Operation
Adjusting height of arm on support column. 8.2 Tool insertion Moving drill head along arm. The Model J-720R uses a No. 4 Morse taper in the Rotating column upon which the arm and head spindle to secure tooling. Any drill, milling cutter, or are attached. -
Page 16: Moving Drill Head Along Arm
THE DRILL MAY TIP OVER AND The J-720R has limit switches on the quill which CAUSE SERIOUS INJURY TO THE DRILL cut power to the drive motor when quill has PRESS OPERATOR, and will certainly result in reached either upper or lower limit of its travel. -
Page 17: Setting Depth Of Cut Using Power Feed
It is recommended that when power feed is not Rotate dial (C) until required feed depth on used, the dial be set to neutral. This minimizes any scale (E) is at zero reference mark (D). wear on power feed mechanism. Push handle (B) to lock this depth setting. -
Page 18: Tapping Operations
8.15 Power ON/OFF the load on the spindle drive motor. It is connected If your J-720R was connected to its service branch into one of the three power lines which supply the correctly, there will be a service disconnect with an main spindle motor. -
Page 19: Arm/Spindle Control Lever
8.21 Arm/spindle control lever 9.2 Head/Rail Backlash The four-position control lever (Figure 7-1) controls If backlash appears between gearbox head and spindle rotation direction and raising and lowering arm rail, the tightness between rail and bearings of arm. can be corrected, as follows. The ability to control arm height is available when: Remove cam shaft cover (#21, Figure 5-2). -
Page 20: Feed Lever/Clutch Engagement
The cam should be sufficiently contacting the 9.3 Feed lever/clutch engagement limiter, as shown in Figure 9-5. If it does not, Loosen set screw on cam (L) and rotate cam If backlash occurs when attempting to engage so that it contacts the limiter, as shown in clutch with feed levers, loosen screws (H, Figure 9- Figure 9-5. -
Page 21: Spindle Speed Chart
7/8 ~ 5/8 5/8 ~ 7/32 7/32 ~ 1/8 Not recommended Tapping (inches) Table 3 11.0 Troubleshooting J-720R Radial Drill Press Trouble Probable Cause Suggested Remedy Drill bit is too large. Turn off power, wait three minutes after spindle stops turning, then push the re-set Feed rate too fast. -
Page 22: User-Maintenance
12.0 User-maintenance Regularly scheduled maintenance is crucial to ensure a long service life for your machine. The schedule below shows general cleaning, lubrication points and coolant replacement information for the J-1230R Radial Arm Drill Press. Item numbers are located in Figures 12-1 through 12-5. Using proper eye protection, clean parts using a metal brush and a rag dipped with oil (Mobil Vactra AA or equivalent). - Page 23 Figure 12-1 Figure 12-3 Figure 12-2 Figure 12-4 Figure 12-5...
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Page 24: Replacement Parts
Number of your machine available when you call will allow us to serve you quickly and accurately. Non-proprietary parts, such as fasteners, can be found at local hardware stores, or may be ordered from JET. Some parts are shown for reference only, and may not be available individually. -
Page 25: Lift Mechanism - Parts List
13.1.2 Lift Mechanism – Parts List Index No. Part No. Description Size 1 ....10162G ..... Top Cap ......................1 2 ....10163 ......Worm Gear ....................1 2-1 ..... TS-1503051 ....Socket Head Cap Screw ........M6x20L ........ 4 3 .... -
Page 26: Coolant Pump Assembly - Exploded View
13.2.1 Coolant Pump Assembly – Exploded View 13.2.2 Parts List for Coolant Pump Assembly – Parts List Index No. Part No. Description Size 1 ....5232291 ....Coolant Pump ........... 130L 220/380V ....1 2 ....TS-1550041 ....Washer ............. M6 ........4 3 .... -
Page 27: Base, Column, And Arm Assemblies - Exploded View
13.3.1 Base, Column, and Arm Assemblies – Exploded View... -
Page 28: Base, Column, And Arm Assemblies - Parts List
13.3.2 Base, Column, and Arm Assemblies – Parts List Index No. Part No. Description Size 1 ....J720R-301G ....Base ......................1 2 ....10039 ......Filter Screen ....................2 3 ....5513357 ....Pan Head Machine Screw ........ 3/16” x 3/8”L ......4 4 .... - Page 29 Index No. Part No. Description Size 59 ....TS-1503051 ....Socket Head Cap Screw ........M6x20L ........ 1 60 ....TS-1505031 ....Socket Head Cap Screw ........M10x25L ......1 61 ....M1402011 ....Bolt ..............5/8” x 2-1/2”L ....... 4 62 ....
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Page 30: Gear Box Assembly - Exploded View
13.4.1 Gear Box Assembly – Exploded View... -
Page 31: Gear Box Assembly - Parts List
13.4.2 Gear Box Assembly – Parts List Index No. Part No. Description Size 1 ....10044G ..... Gear Box ....................... 1 2 ....10045G ..... Gear Box Cover ..................... 1 3 ....5234171 ....Oil Cup .............. PT1/8” x 3/4” ......1 4 .... - Page 32 Index No. Part No. Description Size 53 ....BB-6204ZZ ....Bearing ............. 6204ZZ ........ 1 54 ....10083 ......Sprocket ......................1 55 ....M1328-6x12 ....Key ..............6mm x 12L ......1 56 ....M1204005 ....Chain ..............25H x 70 ......2 57 ....
- Page 33 Index No. Part No. Description Size 111 .... 10091 ......Gear Shaft ..................... 1 112 .... M1312-S24 ....Retainer ............S24 ........1 113 .... J720R-4113 ....Handwheel Lock Nut ..................1 114 .... J720R-4114 ....Handwheel ..................... 1 115 ....
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Page 34: Rear Gear Box Assembly I - Exploded View
13.5.1 Rear Gear Box Assembly I – Exploded View... -
Page 35: Rear Gear Box Assembly Ii - Exploded View
13.5.2 Rear Gear Box Assembly II – Exploded View... -
Page 36: Rear Gear Box Assembly - Parts List
13.5.3 Rear Gear Box Assembly – Parts List Index No. Part No. Description Size 1 ....10044G ..... Gear Box ....................... 1 2 ....10128G ..... Guard ......................1 3 ....TS-1534032 ....Phillips Pan Head Machine Screw ....M6 x 10L ......2 4 .... -
Page 37: Electrical Box - Exploded View
13.6.1 Electrical Box – Exploded View 13.6.2 Electrical Box – Parts List Index No. Part No. Description Size 1 ....10030G ..... Arm ........................ 1 2 ....10156G ..... Cover ......................1 3 ....M1414002 ....Bolt ..............3/16” x 1/4”L ......3 4 .... -
Page 38: Electrical Connections For J-720R
14.0 Electrical Connections for J-720R... -
Page 39: Electrical Connections For J-720R - Parts List
14.1 Electrical Connections for J-720R – Parts List Symbol Part No. Description Size M1 ..... JTM1254VS-FKM1 ..Magnetic Contactor .......... TECO CU-11 ....... 1 M2 ..... JTM1254VS-FKM1 ..Magnetic Contactor .......... TECO CU-11 ....... 1 M3 ..... JTM1254VS-FKM1 ..Magnetic Contactor .......... TECO CU-11 ....... 1 M4 ..... -
Page 40: Warranty And Service
JET sells through distributors only. The specifications listed in JET printed materials and on official JET website are given as general information and are not binding. JET reserves the right to effect at any time, without prior notice, those alterations to parts, fittings, and accessory equipment which they may deem necessary for any reason whatsoever.
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