This .pdf document is bookmarked Operating Instructions and Parts Manual 9x19, 9x29-inch Belt Drive Bench Lathes Models BDB-919, -929 JET 427 New Sanford Road LaVergne, Tennessee 37086 Ph.: 800-274-6848 www.jettools.com Part No.
1.0 IMPORTANT SAFETY INSTRUCTIONS 1.1 GROUNDING INSTRUCTIONS 1. All grounded, cord-connected tools: In the event of a malfunction or breakdown, grounding provides a path of least resistance for electric current to reduce the risk of electric shock. This tool is equipped with an electric cord having an equipment-grounding conductor and a grounding plug. The plug must be plugged into a matching outlet that is properly installed and grounded in accordance with all local codes and ordinances.
1.2 For all tools as applicable 1. READ AND UNDERSTAND the warnings posted on the machine and in this manual. Failure to comply with all of these warnings may cause serious injury. 2. Replace the warning labels if they become obscured or removed. 3. This lathe is designed and intended for use by properly trained and experienced personnel only. If you are not familiar with the proper and safe operation of a lathe, do not use until proper training and knowledge have been obtained. 4.
22. NEVER STAND ON TOOL. Serious injury could occur if the tool is tipped or if the cutting tool is unintentionally contacted. 23. CHECK DAMAGED PARTS. Before further use of the tool, a guard or other part that is damaged should be carefully checked to determine that it will operate properly and perform its intended function - check for alignment of moving parts, binding of moving parts, breakage of parts, mounting, and any other conditions that may affect its operation.
2.0 Table of Contents 1.0 IMPORTANT SAFETY INSTRUCTIONS ....................................................................................................... 2 1.1 GROUNDING INSTRUCTIONS ................................................................................................................. 2 1.2 For all tools as applicable ........................................................................................................................... 3 2.0 Table of Contents ...........................
13.7.1 Gear Box – Exploded View ................................................................................................................. 32 13.7.2 Gear Box – Parts List .......................................................................................................................... 33 13.8.1 Apron I – Exploded View ..................................................................................................................... 35 13.8.2 Apron I – Parts List ............................
3.0 Introduction This manual is provided by JET covering the safe operation and maintenance procedures for a JET Model BDB919/929 Bench Lathe. 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 consistent, long-term operation if used in accordance with instructions set forth in this manual.
BDB-919 Gearbox Number of longitudinal feeds Range of longitudinal feeds Number of inch threads Range of inch threads Number of metric threads Range of metric threads Compound and Carriage Tool post type Maximum tool size Maximum compound slide travel Maximum cross slide travel Maximum carriage travel Tailstock Tailstock spindle travel Diameter of tailstock spindle Taper in tailstock spindle Main materials Headstock Bed Apron/Saddle Tailstock Splash guard Dimensions Bed width Overall dimensions (LxWxH) Ship
5.0 Unpacking Open shipping container and check for shipping damage; report any damage immediately to your distributor and shipping agent. Do not discard any shipping material until the Lathe is assembled and running properly. Compare the contents of your container with the following parts list to make sure all parts are intact. Missing parts, if any, should be reported to your distributor. Read the instruction manual thoroughly for assembly, maintenance and safety instructions. 5.
6.0 Setup and preparation for operation To avoid twisting the bed, make sure the location to which the lathe will be moved is absolutely flat and level. Place a machinist’s level on the bed ways and check for level side-to-side and front to rear. If stand mounted, the stand must be fastened to the floor. (An optional JET stand is available for the lathe BDB919, order stock no. 321375) Remove rust protectant from all surfaces with a soft rag and kerosene, diesel oil, or a mild solvent.
7.3 Carriage The carriage (Figure 5) is made from high-grade cast iron. The sliding parts are smooth ground. They fit the V on the bed without play. The lower sliding parts can be easily and simply adjusted. The cross slide is mounted on the carriage and moves on a dovetail. Play in the cross slide may be adjusted with the gibs. Move the cross slide using the small handwheel (Figure 5). There is a graduated collar on the handwheel. One graduated mark equals 0.0254 millimeters or 0.001 inches.
7.5 Tailstock The tailstock (Figure 9) slides on a V-way and can be clamped at any location. The tailstock has a heavy duty spindle with a Morse taper No.2 socket and a graduated scale. The spindle can be clamped at any location with a clamping lever. The spindle is moved with a handwheel at the end of the tailstock. 7.6 Lead screw The lead screw (Figure 10) is mounted on the front of the machine bed. It is connected to the gearbox at the left for automatic feed and is supported by a bearing on both ends.
8.0 Controls Figure 12 1. 2. 3. 4. 5. 6. 7. 8. 9. Forward/Reverse Switch V-Belt Tension Lever Longitudinal Travel Handwheel Half-Nut Lever Cross Slide Handwheel Top Slide Handwheel Longitudinal Lock Screw Tool Post Tailstock Spindle Handwheel 10. 11. 12. 13. 14. 15. 16. 17.
9.0 Operation 9.1 Tool set-up The cutting angle is correct when the cutting edge is in line with the center axis of the work piece. The correct height of the tool can be achieved by comparing the tool point with the point of the center mounted in the tailstock. The correct tool height can be obtained by using shims under the tool (Figure 13). When turning, the tool has a tendency to bend under pressure. For best results, tool overhang should be kept to a minimum of 3/8” or less. Figure 13 9.
9.4 Taper turning using tailstock offset Offsetting the tailstock can turn work to side angle of 5º. The angle depends on the length of the workpiece. To off-set the tailstock, loosen locking lever (1, Figure 16), then loosen the front adjusting screw (2) and take up the same amount by tightening the opposite rear adjusting screw until the desired taper has been reached. Tighten the front screw to lock the tailstock in position.
9.7 Thread Cutting As indicated on the threading charts (see sect. 15.0), several different threads can be cut using the proper combination of gears and settings. When cutting inch threads, the half nut and threading dial (Figure 19) are used to thread in a conventional manner. The thread dial charts specify at which point a thread can be entered using the threading dial. 9.
10.0 Lathe Accessories 10.1 Three jaw universal lathe chuck Using this universal chuck (Figure 21), round, triangular, square, hexagonal, octagonal, and twelve-cornered stock may be clamped. Note: New lathes have very tight fitting jaws. This is necessary to ensure accurate clamping and long service life. With repeated opening and closing, the jaws adjust automatically and their operation becomes progressively smoother. Figure 21 10.
10.6 Steady rest The steady rest (Figure 25) serves as a support for shafts on the free tailstock end. For many operations, the tailstock cannot be used as it obstructs the turning tool or drilling tool, and therefore, must be removed from the machine. The steady rest, which functions as an end support, ensures chatter-free operation. The steady rest is mounted on the bedways and is secured from below with a locking plate.
10.10 Four-way tool post The four-way tool post is mounted on the top slide and allows for tools to be clamped. Loosen the center clamp handle to rotate any of the four tools into position (Figure 29). Use a minimum of two clamping screws when installing a cutting tool. 10.11 Change Gears There are eleven gears (Figure 30, 2 pre-mounted already) with different numbers of teeth (28, 30, 32, 38, 40, 44, 45, 46, 48, 52 and 56). They can be combined for different speeds and feeds as required.
11.3 Adjustment of compound feed screw and float To adjust the slides on the saddle: 1. Loosen screw (1, Figure 33) and lock nut (2, Figure 33). 2. Adjust the nut until all play has been taken up. Lock the nut (2) with the screw (1). Figure 33 11.4 Cross slide screw Remove the compound slide and adjust screw (1, Figure 34) until the backlash between the spindle and the nut is eliminated. For operator convenience, the compound may be located in two positions on the cross slide. Figure 34 11.
11.6 Adjustment of half-nut guide Loosen two nuts (1, Figure 36) on the right side of the apron and adjust the set screws (2, Figure 36) until both half nuts move freely without play. Tighten both nuts. Figure 36 11.7 Replacing the V-belt Remove tension on the V-belt by pulling lever toward front of the machine (Figure 37). Remove belt from the pulley and replace with new belt. Move lever toward motor to tension belt. Close the cover.
12.0 Lubrication Schedule (Figures 39 and 40) Note: Lubricate all locations daily. Grease refers to #2 tube grease. Oil refers to 20W machine oil. 1 – 1 to 2 squirts of oil into oil ball on gear hub. 2 – Grease teeth of feed and change gears. 3 – Wipe bedways clean and coat lightly with oil. 4 – Grease rack over complete length. 5 – Clean and oil leadscrew over complete length. 6 – 1 to 2 squirts of oil into oil ball on leadscrew bracket. 7 – Lightly coat screw and guides of top slide with oil.
13.0 Replacement Parts Replacement parts are listed on the following pages. To order parts or reach our service department, call 1-800274-6848 Monday through Friday, 8:00 a.m. to 5:00 p.m. CST. Having the Model Number and Serial 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.
13.1.2 Headstock Assembly – Parts List Index No. Part No. Description Size Qty 1 ................ BDB919-001.............. Flange Joint ............................................................. ...................................... 1 2 ................ F010435 .................... Socket Set Screw BO DP ........................................ M8-1.25X8 .................... 3 3 ................ BDB919-003.............. Spindle ..................................................................... ..
13.2.
13.2.2 Drive Belt Assembly – Parts List Index No. Part No. Description Size Qty 101 ............ BDB919-101.............. Bracket Plate ........................................................... ...................................... 1 102 ............ TS-1504041 .............. Hex Socket Hd Cap Screw ...................................... M8-1.25X20 .................. 2 103 ............ BDB919-103.............. Belt Pulley Shaft ...................................................... ..................
13.3.1 Belt Tension Lever – Exploded View 13.3.2 Belt Tension Lever – Parts List Index No. Part No. Description Size Qty 201 ............ BDB919-201.............. Lever Bracket Assembly .......................................... ...................................... 1 202 ............ BB-6001ZZ ................ Ball Bearing ............................................................. 6001ZZ ......................... 2 203 ............ BDB919-203.............. Roller ..................................
13.4.1 Change Gears – Exploded View 13.4.2 Change Gears – Parts List Index No. Part No. Description Size Qty 301 ............ BDB919-301.............. Bracket..................................................................... ...................................... 1 302 ............ BDB919-302.............. T-Nut ........................................................................ ...................................... 1 303 ............ BDB919-303.............. Flat Washer, spcl ................
13.5.
13.5.2 Electrical – Parts List Index No. Part No. Description Size Qty 401 ............ BDB919-401.............. Electrical Box ........................................................... ...................................... 1 402 ............ BDB919-402.............. Button LAY37(PBC)-C ............................................. ...................................... 1 403 ............ BDB919-403.............. Switch ZH-A ............................................................. ..............
13.6.1 Chuck Guard – Exploded View 13.6.2 Chuck Guard – Parts List Index No. Part No. Description Size Qty 501 ............ TS-1540031 .............. Hex Nut .................................................................... M5 ................................. 2 502 ............ BDB919-502.............. Bracket..................................................................... ...................................... 1 503 ............ TS-1502021 .............. Hex Socket Hd Cap Screw ..............
13.7.
13.7.2 Gear Box – Parts List Index No. Part No. Description Size Qty 601 ............ F005338 .................... Hex Socket Hd Cap Screw ...................................... M3-0.5x5 ....................... 4 602 ............ BDB919-602.............. Graphic Plate ........................................................... ...................................... 1 603 ............ BDB919-603.............. Lever ........................................................................ .................
Index No. Part No. Description Size Qty 705 ............ BDB919-705.............. Gear ......................................................................... 12T-1.25M .................... 1 706 ............ BDB919-706.............. Screw ....................................................................... ...................................... 1 707 ............ TS-1502021 .............. Hex Socket Hd Cap Screw ...................................... M5-0.8X10 .................... 1 708 ..........
13.8.
13.8.2 Apron I – Parts List Index No. Part No. Description Size Qty 701 ............ F010960 .................... Socket Hd Flat Screw .............................................. M6-1.0X8 ...................... 2 702 ............ BDB919-702.............. Washer .................................................................... ...................................... 2 703 ............ AH25C-060 ............... Spring Pin ................................................................ 4X30mm .......
13.9.1 Apron II – Exploded View 13.9.2 Apron II – Parts List Index No. Part No. Description Size Qty 752 ............ BDB919-752.............. Screw ....................................................................... ...................................... 1 753 ............ TS-1540061 .............. Hex Nut .................................................................... M8X1 ............................ 1 754 ............ BDB919-754.............. Worm ..........................................
13.10.
13.10.2 Saddle and Cross Slide – Parts List Index No. Part No. Description Size Qty 801 ............ BDB919-801.............. Saddle ..................................................................... ...................................... 1 802 ............ BDB919-802.............. Cross Slide .............................................................. ...................................... 1 803 ............ BDB919-803.............. Gib ............................................................
13.11.
13.11.2 Compound Slide – Parts List Index No. Part No. Description Size Qty 901 ............ BDB919-901.............. Longitudinal Slide .................................................... ...................................... 1 902 ............ BDB919-902.............. Swivel Base ............................................................. ...................................... 1 903 ............ BDB919-903.............. Gib ..........................................................................
13.12.
13.12.2 Tailstock – Parts List Index No. Part No. Description Size Qty 1001 .......... BDB919-1001............ Tailstock Ram .......................................................... ...................................... 1 1002 .......... BDB919-1002............ Lead Screw .............................................................. ...................................... 1 1003 .......... BDB919-1003............ Bushing .................................................................... ...........
13.13.1 Steady Rest – Exploded View 13.13.2 Steady Rest – Parts List Index No. Part No. Description Size Qty 1101 .......... BDB919-1101............ Rest Casting ............................................................ ...................................... 1 1102 .......... BDB919-1102............ Jaw .......................................................................... ...................................... 3 1103 .......... BDB919-1103............ Screw .....................................
13.14.1 Follow Rest – Exploded View 13.14.2 Follow Rest – Parts List Index No. Part No. Description Size Qty 1201 .......... BDB919-1201............ Follow Rest Casting ................................................. ...................................... 1 1202 .......... BDB919-1202............ Jaw .......................................................................... ...................................... 2 1203 .......... BDB919-1203............ Screw .........................................
13.15.
13.15.2 BDB-919 Bed Assembly – Parts List Index No. Part No. Description Size Qty 1301 .......... BDB919-1301............ Bed .......................................................................... ...................................... 1 1302 .......... BDB919-1302............ Splash Guard ........................................................... ...................................... 1 1303 .......... TS-1502021 .............. Hex Socket Hd Cap Screw ...................................... M5X10 .
13.16.
13.16.2 BDB-929 Bed Assembly – Parts List Index No. Part No. Description Size Qty 1301-1 ....... BDB929-1301............ Bed .......................................................................... ...................................... 1 1302-1 ....... BDB929-1302............ Splash Guard ........................................................... ...................................... 1 1303 .......... TS-1502021 .............. Hex Socket Hd Cap Screw ...................................... M5X10 ...
13.17.1 Accessories – Exploded View 13.17.2 Accessories – Parts List Index No. Part No. Description Size Qty 1401 .......... BDB919-1401............ 4-Jaw Chuck Kit ....................................................... 187mm .......................... 1 1401A ........ .................................. 4-Jaw Chuck Body ................................................... ...................................... 1 1401B ........ BDB919-1401B ......... 4-Jaw Chuck Key .....................................
13.18.1 BDB-919 Stand #321375 (Optional Accessory) – Exploded View 13.18.2 BDB-919 Stand #321375 (Optional Accessory) – Parts List Index No. Part No. Description Size Qty .................. 321375 ...................... BDB-919 Stand (#1501 thru 1510) .......................... ...................................... 1 1501 .......... BDB919-1501............ Left Stand ................................................................ H:760mm ...................... 1 1502 .......... BDB919-1502...........
13.19.2 BDB-929 Stand #321377 (Optional Accessory) – Exploded View 13.19.2 BDB-929 Stand #321377 (Optional Accessory) – Parts List Index No. Part No. Description Size Qty .................. 321377 ...................... BDB-929 Stand (#1501 thru 1510) .......................... ...................................... 1 1501 .......... BDB919-1501............ Left Stand ................................................................ H:760mm ...................... 1 1502 .......... BDB919-1502...........
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16.0 Warranty and service JET warrants every product it sells against manufacturers’ defects. If one of our tools needs service or repair, please contact Technical Service by calling 1-800-274-6846, 8AM to 5PM CST, Monday through Friday. Warranty Period The general warranty lasts for the time period specified in the literature included with your product or on the official JET branded website. • JET products carry a limited warranty which varies in duration based upon the product.
427 New Sanford Road LaVergne, Tennessee 37086 Phone: 800-274-6848 www.jettools.
