MODEL G0720R HEAVY-DUTY BENCHTOP MILLING MACHINE OWNER'S MANUAL COPYRIGHT © NOVEMBER, 2010 BY GRIZZLY INDUSTRIAL, INC., REVISED MAY, 2018 (HE) WARNING: NO PORTION OF THIS MANUAL MAY BE REPRODUCED IN ANY SHAPE OR FORM WITHOUT THE WRITTEN APPROVAL OF GRIZZLY INDUSTRIAL, INC.
This manual provides critical safety instructions on the proper setup, operation, maintenance, and service of this machine/tool. Save this document, refer to it often, and use it to instruct other operators. Failure to read, understand and follow the instructions in this manual may result in fire or serious personal injury—including amputation, electrocution, or death. The owner of this machine/tool is solely responsible for its safe use.
Table of Contents INTRODUCTION................................................ 2 Manual Accuracy............................................ 2 Contact Info.................................................... 2 Machine Description....................................... 2 Identification.................................................... 3 SECTION 1: SAFETY........................................ 6 Safety Instructions for Machinery................... 6 Additional Safety for Mills..............................
INTRODUCTION Manual Accuracy Contact Info We are proud to provide a high-quality owner’s manual with your new machine! We stand behind our machines! If you have questions or need help, contact us with the information below. Before contacting, make sure you get the serial number and manufacture date from the machine ID label. This will help us help you faster. We made every effort to be exact with the instructions, specifications, drawings, and photographs in this manual.
Identification A B Y W D C X V Z E F U G T S R Q P H O M N L J K I Figure 1. G0720R Identification. A. B. C. D. E. F. G. H. I. J. K. L. M. Safety Cover and Drawbar Fine Feed Knob Mini Digital Protractor Main Power Switch Fine Feed Lock Knob w/Assist Lever Downfeed Handle Precision Dovetailed Column Longitudinal (X-Axis) Handwheel Cast-Iron Base Base Mounting Boss Cross (Y-Axis) Handwheel Precision Dovetailed Table Ways Table Locks Model G0720R (Mfg. Since 11/10) N. O. P. Q. R. S. T. U.
MACHINE DATA SHEET Customer Service #: (570) 546-9663 · To Order Call: (800) 523-4777 · Fax #: (800) 438-5901 MODEL G0720R HEAVY‐DUTY BENCH TOP MILLING MACHINE Product Dimensions: Weight.............................................................................................................................................................. 596 lbs. Width (side-to-side) x Depth (front-to-back) x Height............................................................... 14-1/2 x 30-1/2 x 43 in.
Main Specifications: Operation Info Spindle Travel...................................................................................................................................... 3-5/16 in. Max Distance Spindle to Column........................................................................................................ 11-3/8 in. Max Distance Spindle to Table............................................................................................................ 15-3/4 in.
SECTION 1: SAFETY For Your Own Safety, Read Instruction Manual Before Operating This Machine The purpose of safety symbols is to attract your attention to possible hazardous conditions. This manual uses a series of symbols and signal words intended to convey the level of importance of the safety messages. The progression of symbols is described below. Remember that safety messages by themselves do not eliminate danger and are not a substitute for proper accident prevention measures.
WEARING PROPER APPAREL. Do not wear clothing, apparel or jewelry that can become entangled in moving parts. Always tie back or cover long hair. Wear non-slip footwear to reduce risk of slipping and losing control or accidentally contacting cutting tool or moving parts. HAZARDOUS DUST. Dust created by machinery operations may cause cancer, birth defects, or long-term respiratory damage. Be aware of dust hazards associated with each workpiece material.
Additional Safety for Mills UNDERSTANDING CONTROLS. Make sure you understand the use and operation of all controls. SAFETY ACCESSORIES. Always use a chip guard in addition to your safety goggles when milling to prevent bodily injury. WORK HOLDING. Before starting the machine, be certain the workpiece has been properly clamped to the table. NEVER hold the workpiece by hand when using the mill. CHUCK KEY SAFETY. Always remove your chuck key, drawbar wrench, and any service tools immediately after use.
SECTION 2: POWER SUPPLY Availability Circuit Requirements Before installing the machine, consider the availability and proximity of the required power supply circuit. If an existing circuit does not meet the requirements for this machine, a new circuit must be installed. To minimize the risk of electrocution, fire, or equipment damage, installation work and electrical wiring must be done by an electrician or qualified service personnel in accordance with all applicable codes and standards.
Grounding & Plug Requirements The full-load current is not the maximum amount of amps that the machine will draw. If the machine is overloaded, it will draw additional amps beyond the full-load rating. If themachine machine is is equipped overloaded for aa power sufficient length This with cord that of time, damage, overheating, or fire may result— has an equipment-grounding wire and a grounding especially connected to aanmatching undersized circuit. plug.
SECTION 3: SETUP Needed for Setup This machine presents serious injury hazards to untrained users. Read through this entire manual to become familiar with the controls and operations before starting the machine! Wear safety goggles during the entire setup process! The following are needed to complete the setup process, but are not included with your machine. Description Qty • An Assistant................................................ 1 • Precision Level............................................
Inventory The following is a list of items shipped with your machine. Before beginning setup, lay these items out and inventory them. If any non-proprietary parts are missing (e.g. a nut or a washer), we will gladly replace them; or for the sake of expediency, replacements can be obtained at your local hardware store. Box 1: (Figures 3 & 4) Qty A. Assembled Mill............................................ 1 B. Drill Chuck................................................... 1 C. Open End Wrench 8/10mm........
Cleanup The unpainted surfaces of your machine are coated with a heavy-duty rust preventative that prevents corrosion during shipment and storage. This rust preventative works extremely well, but it will take a little time to clean. Be patient and do a thorough job cleaning your machine. The time you spend doing this now will give you a better appreciation for the proper care of your machine's unpainted surfaces.
Site Considerations Weight Load Physical Environment Refer to the Machine Data Sheet for the weight of your machine. Make sure that the surface upon which the machine is placed will bear the weight of the machine, additional equipment that may be installed on the machine, and the heaviest workpiece that will be used. Additionally, consider the weight of the operator and any dynamic loading that may occur when operating the machine.
Mounting to Workbench Your mill should be bolted to a workbench to provide maximum rigidity and safety. Components and Hardware Needed: Qty Hex Bolts 1⁄ 2"-13 x (length as needed)................4 Flat Washers 1⁄ 2"..................................................8 Lock Washers 1⁄ 2"................................................4 Hex Nuts 1⁄ 2"-13...................................................4 To mount the mill to the workbench: 1. Determine the best position for the mill on the workbench.
2. Do all lubrication procedures highlighted in Lubrication in SECTION 6: MAINTENANCE on Page 30. 12. WITHOUT resetting the EMERGENCY STOP switch, press the START button. The machine should not start. 3. If there is no arbor or chuck installed in the spindle, remove the drawbar cap and the drawbar to prevent vibration. 13. Reset the EMERGENCY STOP switch, open the chip guard, and press the START button again. The machine should not start.
Spindle Break-In 2. Note: When in tapping mode, the spindle speed is reduced by half automatically, and the speed range will be 50–800 RPM. Tapping requires lower speeds than other milling operations. Before putting this machine into full service, the Test Run must be completed and the spindle bearings must be broken in. DO NOT leave the area while break-in procedure is under way. You must be ready to stop the machine if any problem occurs. To break in the machine: 1. 3.
SECTION 4: OPERATIONS Operation Overview The purpose of this overview is to provide the novice machine operator with a basic understanding of how the machine is used during operation, so the machine controls/components discussed later in this manual are easier to understand. Due to the generic nature of this overview, it is not intended to be an instructional guide.
Controls C. Main Power Switch: Toggles power ON and OFF to the control panel. Review this section to locate and understand how to use the mill controls and factors for machine operation. General Controls The controls shown in Figure 10 turn the main machine power ON and OFF, and reverse spindle direction. Also shown are the locations of the control panel, spindle height gauge, and the digital protractor, which will be detailed in their own sub-sections D.
Digital Spindle Height Gauge Mini Digital Protractor The digital spindle height scale shown in Figure 12 displays spindle position and movement. An auto shut-off feature will turn the unit OFF after several minutes of idle time. When turned back ON, the last measurement is recalled so work can be resumed. However, if the battery is changed or becomes discharged, the stored value is lost.
Selecting Spindle RPM Setting Spindle Height Closely follow the proper cutting speed and proper feed to reduce undue strain on all moving parts and increase operator safety. Spindle height is changed by unlocking the quill lock and using the downfeed handles or the fine feed knob (see Figure 15). The digital height gauge indicates the spindle height. Prior to milling, determine the RPM needed to cut your workpiece, then set the RPM on the machine. To change the spindle position: 1.
Drill Chuck Installation & Removal The chuck is attached to an R-8 arbor using a B18 taper. This attachment is considered to be semipermanent. There should be no need to separate the chuck from the arbor. Spindle Lock Pin Installation 1. DISCONNECT MILL FROM POWER! 2. Insert the chuck arbor into the spindle so it engages the alignment pin inside of the spindle and makes contact with the drawbar threads. 3. Thread the drawbar into the arbor until the arbor is seated up into the spindle taper. 4.
R-8 Collet Installation & Removal Removal 1. DISCONNECT MILL FROM POWER! 2. Tighten the headstock lock. If you do not use the drill chuck and arbor, you need to use a collet to insert the cutting tool into the spindle. Your Model G0720R features an R-8 spindle taper, which gives the freedom to use common R-8 collets. These optional collets come in many sizes, typically ranging from 1⁄ 16" to 7⁄ 8" and 3mm to 20mm, and should be matched to your cutting tool shank size. Installation 1.
Headstock Travel (Z-Axis & Rotation) Your mill has a dovetailed column that allows you to reposition the headstock along the Z-axis and change tooling without losing your alignment with a hole or milling path. For angled milling operations, the headstock can be rotated left and right 45°. 3. Observe the height scale on the left side column shown in Figure 20 to determine the headstock travel. This scale is broken down in 1⁄ 8" graduations.
Tilting 5. 1. DISCONNECT MILL FROM POWER! 2. On the digital protractor shown in Figure 21, press the ON/OFF button to turn it ON, and press CALIBRATE to set its digital display to zero. Figure 21. Digital protractor. 3. Press 0% button to select the type of angle units shown on the digital display. 4. Located on the headstock swivel mount, loosen the left, right, and lower headstock tilt lock nuts shown in Figure 22.
Table Travel (X-Axis & Y-Axis) Using the handwheels, the milling table can be moved in and out (Y-axis), and left and right (X-axis). The handwheels are fitted with a graduated dial shown in Figure 23 that reads in increments of 0.001" where one complete rotation equals 1⁄ 8" of table travel. The Y-axis handwheel can be disengaged from the leadscrew, so it can safely freewheel if a power feed is in installed and in use. Both the X and Y leadscrews are 8 TPI and 20mm in diameter. Figure 23. Handwheel scale.
Milling/Drilling Mode Tapping Mode This mill is designed to use end mills, taps, drill bits, and face cutters up to 2 1⁄ 8" in diameter. The milling table has a coolant trough with drain for an optional cutting fluid system. When in the tapping mode, the spindle direction can immediately alternated between forward and reverse immediately by pressing any of the spindle direction buttons at the end of the downfeed handles.
ACCESSORIES SECTION 5: ACCESSORIES Some aftermarket accessories can be installed on this machine that could cause it to function improperly, increasing the risk of serious personal injury. To minimize this risk, only install accessories recommended for this machine by Grizzly. T10057—Tapping Attachment Safely use your benchtop milling machine to tap threads into blind holes.
G9760—20-PC. 2 & 4 Flute TiN End Mill Set. Includes these sizes and styles in two and four flute styles: 3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 3/8", 11 /16", and 3/4". G5641—1-2-3 Blocks G9815—Parallel Set G5641 G9815 Figure 29. G9760 20-PC End Mill Set. G9765—9-PC. Ball End Mill Set Features 2 flute ball nose end mills. Includes the following sizes: 1/8", 3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 5/8" and 3/4". Figure 32. G5641 1-2-3 Blocks, G9815 Parallel Set, and H5556 Edge Finder Set.
SECTION 6: MAINTENANCE Monthly Always disconnect power to the machine before performing maintenance. Failure to do this may result in serious personal injury. Schedule Typically, each operator is responsible for ensuring proper care of the equipment. We strongly recommend all operators make a habit of following the daily maintenance procedures.
Ball Oilers This mill has nine ball oilers shown in Figures 35–39. Make sure to use an oil gun fitted with a rubber tip that is wide enough to seal the ball oiler inlet. This seal allows the gun to build hydraulic pressure in order to flush out contaminants and deliver fresh oil to components at the end of long passages. Do not use oil guns equipped with a sharp steel lance tip. These narrow tips often seal poorly and oil is not pumped deep into the system.
Leadscrews 6. Clean and relubricate the leadscrews monthly. Repeat this task more frequently if the machine is under heavy use or operates in adverse conditions. Connect the mill to power, and run the headstock up and down to spread the grease. 7. Wipe-off excess grease with a clean rag. 8. Move the table to the far right and all the way forward to expose the leadscrew, as shown in Figure 40. 9. Clean and lubricate the table leadscrews in the same manner as the column leadscrew.
Battery Replacement Digital Spindle Height Gauge When the batteries for the digital spindle scale need replacement, the display will be dim or not display at all. To replace the battery: 1. Slide the battery cover to the right. When the batteries need replacement in the mini digital protractor, the battery icon shown in Figure 42 will stay on the display until the batteries are replaced. Items Needed: Qty Battery (Silver Cell SR44)................................... 1 2.
SECTION 7: SERVICE Review the troubleshooting procedures in this section if a problem develops with your machine. If you need replacement parts or additional help with a procedure, call our Technical Support. Note: Please gather the serial number and manufacture date of your machine before calling. Troubleshooting Symptom Possible Cause Possible Solution Motor will not start. 1. Emergency stop button is pressed. 2. Chip guard switch at fault. 1. Reset switch or replace bad switch. 2.
Gib Adjustment The headstock and table on this mill each use a long steel wedge called a gib that is positioned between the component and its dovetailed-ways. At the end of each gib is a screw, as shown in Figure 45. NOTICE When adjusting gibs, keep in mind that the goal of gib adjustment is to remove unnecessary sloppiness from the slide without causing binding and excessive leadscrew nut wear. Table Gib Adjustment Lock Lever Front Gib Screw (Y-axis) 1. DISCONNECT MILL FROM POWER! 2.
Machine Storage Headstock Gib Adjustment 1. DISCONNECT MILL FROM POWER! 2. Loosen the headstock lock levers shown in Figure 46. Upper Gib Screw If the machine is not properly prepared for storage, it may develop rust or corrosion. Use the recommendations in this section to ensure that the mill remains in good condition for later use. To prepare your machine for storage: Lock Levers Lower Gib Screw 1. Remove any residual cutting fluid from the table and machine body. 2.
SECTION 8: WIRING These pages are current at the time of printing. However, in the spirit of improvement, we may make changes to the electrical systems of future machines. Compare the manufacture date of your machine to the one stated in this manual, and study this section carefully. If there are differences between your machine and what is shown in this section, call Technical Support at (570) 546-9663 for assistance BEFORE making any changes to the wiring on your machine.
Wiring Overview Component Locations a b f h g e i c d j a b c d e f g h i j System Overview Elevation Motor (See Page 39 and Figure 54) Spindle Motor (See Page 40 and Figure 54) Spindle Direction Switch (See Page 40 and Figure 52) Chip Guard Safety Switch (See Page 40 and Figure 51) Work Lamp (See Page 40 and Figure 49) Control Panel (See Page 40 and Figure 50) Main Power Switch (See Page 39 and Figure 48) Main Electrical Panel (See Page 39 and Figure 47) Elevation Travel Limit Switches (See Page 39
Wiring Diagram MAIN POWER SWITCH (both sides shown) g Front View Elevation Motor h Transformer TDE 2232 110V/24V 2 a 1 HL 2 1 1-3 11 HL 15 3 4 13 14 4 1-2 Rear View 13 12 12 Start Capacitor 14MFD 450VAC 13 12 7 i 11 10 i 10 L1 N1 10 11 9 9 4 15 14 7 HL V XMT_CONTROL_1000&1500 L1 N1 PE W XMT_DRIVER_1500 Motor Power Supply PC Board/Inverter Elevation Travel Limit Switches FastBlow Fuse 30A 250VAC ZM3303 U 2-3 2-2 K4 K3 S1 S1 K3 K4 +5V GND SA SB SC Pu S1 K3 K4 +5V SA SB
Wiring Diagram Digital Spindle Depth Unit Spindle Motor 0000 0000 b Silver Oxide Battery SR44 1.
Electrical Components Circuit Board Fuse Transformer Main Power Switch Figure 48. Main power switch and transformer. Electrical Box Fuse Set Figure 47. Motor power supply circuit board. Work Lamp Limit Switches Figure 49. Rear view electrical components. Model G0720R (Mfg.
Figure 53. Tachometer electrical. Figure 50. Control panel electrical. Headstock Elevation Motor Spindle Motor (Inside) Main Power Switch Figure 51. Chip guard safety switch. Figure 52. Tapping button slip ring contact. Figure 54. Front view electrical components. -42- READ ELECTRICAL SAFETY ON PAGE 37! Model G0720R (Mfg.
Model G0720R (Mfg.
Head Parts List REF PART # DESCRIPTION REF PART # DESCRIPTION 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 DRAWBAR COVER CAP SCREW M5-.
Head Parts List REF PART # DESCRIPTION REF PART # DESCRIPTION 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 PHLP HD SCR M3-.5 X 8 HEAD FRONT COVER PHLP HD SCR M3-.5 X 20 LOCK SCREW COMPRESSION SPRING 0.8 X 10 X 14 LOCK HANDLE PHLP HD SCR M6-1 X 10 INT THREADED TAPER PIN 6 X 20 DIGITAL PROTRACTOR BOX DIGITAL PROTRACTOR DIGITAL PROTRACTOR FRAME LOCK COLLAR WORM SHAFT THRUST BEARING 8101 SHAFT FLANGE PHLP HD SCR M4-.
212 212 -46- 211 213 201 202 203 208 209 210 204 205 206 207 209 214 217 204A 218 268 216 215 222 219 220 235 229 234 237 241 239 233 243 240 240 223 212 236 227 219 221 212 226 228 230 238 242 244 245A 231 232 245 246 249 219 247 252 251 250 248 253 254 255 224 267 212 266 212 256 259 256 257 224 263 265 264 262 261 260 258 254 258 Column Breakdown Model G0720R (Mfg.
Column Parts List REF PART # DESCRIPTION REF PART # DESCRIPTION 201 202 203 204A 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 226 227 228 229 230 231 232 233 234 235 PHLP HD SCR M8-1.25 X 12 LOCK WASHER 8MM FLAT WASHER 8MM LEADSCREW W/NUT ASSEMBLY ELEVATION LEADSCREW THRUST BEARING 8102 BUSHING LEADSCREW NUT THRUST BEARING 8102 SPANNER NUT CAP SCREW M4-.7 X 16 BOTTOM COLUMN COVER PHLP HD SCR M4-.7 X 6 TOP COLUMN COVER LEADSCREW COUPLER PHLP HD SCR M5-.
-48- 305 306 320 337 336 321 309 333A 303 301 302 308 307 303 301 314 335 314 333 315 334 318 317 314 313 305 315 314 303 319 313 312 343 316 310 343A 346 323 344 339 361 352 353 362 342 328 330 329 328 357 360 351 354 329 359 330 327 305 325 358 348 349 350 357 331 332 324 356 355 363 345 341 305 340 322 340 341 339 338 338 322 342 325 347 352 353 Table Breakdown Model G0720R (Mfg.
Table Parts List REF PART # DESCRIPTION REF PART # DESCRIPTION 301 302 303 305 306 307 308 309 310 312 313 314 315 316 317 318 319 320 321 322 323 324 325 327 328 329 330 331 332 333A 333 PHLP HD SCR M5-.8 X 12 CROSS WAY COVER TAP-IN BALL OILER 8MM GIB SCREW LONGINTUDINAL TABLE GIB CAP SCREW M10-1.
Label Placement 402 403 404 401 405 401 408 401 407 406 409 REF PART # DESCRIPTION REF PART # DESCRIPTION 401 402 403 404 405 ELECTRICITY LABEL MACHINE ID LABEL MACHINE WARNING LABEL DISCONNECT POWER WARNING READ MANUAL LABEL 406 407 408 409 EYE/LUNG HAZARD LABEL ROTATING CUTTER WARNING LABEL ENTANGLEMENT HAZARD LABEL GRIZZLY GREEN TOUCH-UP PAINT P0720R401 P0720R402 P0720R403 P0720R404 P0720R405 P0720R406 P0720R407 P0720R408 P0720R409 Safety labels warn about machine hazards and ways to p
WARRANTY CARD Name _____________________________________________________________________________ Street _____________________________________________________________________________ City _______________________ State _________________________ Zip _____________________ Phone # ____________________ Email _________________________________________________ Model # ____________________ Order # _______________________ Serial # __________________ The following information is given on a voluntary basis.
FOLD ALONG DOTTED LINE Place Stamp Here GRIZZLY INDUSTRIAL, INC. P.O.
WARRANTY AND RETURNS Grizzly Industrial, Inc. warrants every product it sells for a period of 1 year to the original purchaser from the date of purchase. This warranty does not apply to defects due directly or indirectly to misuse, abuse, negligence, accidents, repairs or alterations or lack of maintenance.
