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Model g8688 (Mfg. 3/09+)

-25-

carriage

the longitudinal movement of the carriage (car-
riage feed) on the Model g8688 can be controlled
both manually and automatically.

To move the carriage feed manually:

1. rotate the handwheel clockwise to move the

carriage right and rotate the handwheel coun-
terclockwise to move the carriage left.

2. Set the handwheel scale in the same manner

as described in the

cross slide instructions

on

page 25, and be sure to account for the

backlash.

Automatic carriage feed

the feed rate is based on the rotational speed of
the leadscrew which is determined by the gear
configuration in the headstock. the feed rate for
normal turning is much less than used for screw
cutting. therefore, it is very important to pay close
attention to the gear combinations you have cho-
sen before engaging the auto feed lever. the lathe
comes from the factory set up for normal turning.
gear changes for thread cutting will be covered
later.

crAsHING HAzArD! pay close attention

to feed rate before engaging power feed.

be alert and ready to shut Off power feed,

otherwise carriage will crash into rotat-

ing spindle, causing damage and possible

injury!

To use the automatic carriage feed for normal

turning:

1. use the manual feed handwheel to position

the carriage to your desired starting point and
set the scale on the handwheel to “0”.

2. Set the lead screw ForWard/nEutral/

rEVErSE lever to ForWard.

3. Set the ForWard/oFF/rEVErSE toggle to

ForWard.

4. turn the VariaBlE SpEEd Control dial

to the desired rpM.

5. Move the feed lever down to engage the

half-nut, which in turn, makes the automatic
carriage feed active (see

figure 24).

figure 24. Feed lever.

6. lift the feed lever to stop the automatic car-

riage feed.

the automatic carriage feed can also oper-
ate in the rEVErSE direction by changing the
leadscrew direction after turning the lathe

Off.

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Содержание G8688

Страница 1: ...t SEPTEMBER 2005 By Grizzly Industrial Inc REVISED January 2010 Tr Warning No portion of this manual may be reproduced in any shape Or form without the written approval of Grizzly Industrial inc For models manufactured SINCE 3 09 PC7563 printed in CHINA ...

Страница 2: ... personal protective equipment The manufacturer will not be held liable for injury or property damage from negligence improper training machine modifications or misuse Some dust created by power sanding sawing grinding drilling and other construction activities contains chemicals known to the State of California to cause cancer birth defects or other reproductive harm Some examples of these chemic...

Страница 3: ...4 Installing Handwheel Handles 15 Test Run 16 SECTION 4 OPERATIONS 17 Speed Power Controls 17 Chuck Jaws 18 Replacing Chuck Jaws 19 Removing Installing Chuck or Faceplate 20 Tailstock 21 Tailstock Positioning 21 Dead Center 22 Tool Post 22 Steady Rest 23 Cross Slide 24 Compound Slide 24 Carriage 25 Gear Charts 26 Change Gears 26 Cutting Threads 27 SECTION 5 ACCESSORIES 28 SECTION 6 MAINTENANCE 30 ...

Страница 4: ...e manual If you find this to be the case and the dif ference between the manual and machine leaves you in doubt check our website for the latest manual update or call technical support for help Before calling find the manufacture date of your machine by looking at the date stamped into the machine ID label see below This will help us determine if the manual version you received matches the manufac...

Страница 5: ... Chip Tray Identification Figure 1 G8688 Identification A E H K F G B C D L I J NOTICE If you have never used this type of machine or equipment before We strongly recommend that you read books trade magazines or get formal training before beginning any projects Regardless of the content in this section Grizzly Industrial will not be held liable for accidents caused by lack of training ...

Страница 6: ...ensions Type Cardboard Content Machine Weight 90 lbs Length Width Height 30 x 13 x 13 in Electrical Switch Forward Reverse Switch Voltage 110V Cord Length 6 ft Cord Gauge 14 gauge Minimum Circuit Size 10 amp Plug Included Yes Motors Main Type Universal Brush Horsepower 3 4 HP Voltage 110V Prewired 110V Phase Single Amps 3A Speed Variable RPM Cycle 60 Hz Number Of Speeds Variable Power Transfer Bel...

Страница 7: ... Threads 12 52 TPI Range Of Longitudinal Feeds 0 04 in No Of Longitudinal Feeds 1 No Of Metric Threads 10 Range Of Metric Threads 0 4 2 0 mm Dimensions Bed Width 3 1 4 in Leadscrew TPI 16 Leadscrew Length 17 3 4 in Follow Rest Capacity 1 in Faceplate Size 6 1 4 in Leadscrew Diameter 5 8 in Floor To Center Height 8 1 2 in Construction Base Construction Cast Iron Headstock Construction Cast Iron Hea...

Страница 8: ...d can cause cancer and severe respiratory illnesses 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 which are intended to convey the level of importance of the safety messages The progression of symbols is described below Rememb...

Страница 9: ... changing accessories 16 MAKE SURE GUARDS ARE IN PLACE AND WORK CORRECTLY BEFORE USING MACHINERY Safety Instructions for Machinery 17 REMOVE ADJUSTING KEYS AND WRENCHES Make a habit of checking for keys and adjusting wrenches before turn ing machinery ON 18 CHECK FOR DAMAGED PARTS BEFORE USING MACHINERY Check for binding and alignment of parts broken parts part mounting loose bolts and any other c...

Страница 10: ...piece of plywood over the ways of the lathe when servicing chucks 9 LATHE MAINTENANCE Never operate the lathe with damaged or worn parts 10 SAFETY CLEARANCES Make sure workpiece has adequate clearance before starting machine Check tool and tool post clearance chuck clearance and saddle clearance before starting the lathe 11 PROPER FEED RATES Always use the appropriate feed and speed rates 12 STOPP...

Страница 11: ...rong in the plug to help ensure that it is grounded DO NOT remove ground prong from plug to fit into a two pronged outlet If the plug will not fit the outlet have the proper outlet installed by a qualified electrician Extension Cords We do not recommend using extension cords but if you find it absolutely necessary Use at least a 14 gauge cord that does not exceed 50 feet in length The extension co...

Страница 12: ...ss This machine presents serious injury hazards to untrained users Read through this entire manu al to become familiar with the controls and opera tions before starting the machine Unpacking SECTION 3 SET UP The Model G8688 is a heavy machine DO NOT over exert yourself while unpacking or moving your machine get assis tance The following are needed to complete the set up process but are not include...

Страница 13: ...nd Wrench 14 17mm 1 I Dead Center MT 2 1 J External Jaws for 3 Jaw Chuck 3 K Plastic Gear Set 65 60 57 55 50 45 40 Qty 2 35 30 Tooth 1 ea L Steady Rest 1 M Faceplate 160mm 1 N Brackets with Rubber Feet 2 O Spare Fuse 1 Figure 3 Model 8688 Mini Lathe In the event that any nonproprietary parts are missing e g a nut or a washer we would be glad to replace them or for the sake of expedi ency replaceme...

Страница 14: ... 12 Model G8688 Mfg 3 09 Hardware Recognition Chart ...

Страница 15: ...faces are coated with a waxy oil to prevent corrosion during shipment Remove this protective coating with a solvent cleaner or degreaser such as shown in Figure 5 For thor ough cleaning some parts must be removed For optimum performance clean all moving parts or sliding contact surfaces Avoid chlo rine based solvents such as acetone or brake parts cleaner that may damage painted surfac es Always f...

Страница 16: ...bber feet are attached to two metal brack ets The feet and the brackets bolt through the chip tray and into the base of the lathe To attach the rubber feet 1 Remove the four Phillips head screws from the bottom of the chip tray 2 Attach the two brackets with the screws you removed in Step 1 see Figure 8 Figure 8 Installing the feet Moving Placing Mini Lathe The Model G8688 is a heavy machine DO NO...

Страница 17: ...and cross feed handwheels see Figure 9 2 Tighten the nut securely against the handwheel while ensuring the handle can spin freely around the bolt with minimal end play Figure 10 Flipping the handle Cross Slide Feed 3 The cross slide feed has been turned around for shipment With a 5mm hex wrench remove the cap screw turn the handle around and retighten the cap screw see Figure 10 Figure 9 Installin...

Страница 18: ... starts Strange or unnatural noises should be investigated and corrected before operating the machine fur ther 6 If the lathe is running smoothly allow it to run for several minutes Gradually increase the RPM and let it run a couple of minutes at each change until you reach the maximum RPM of 2500 7 Turn the lathe OFF by pressing the EMERGENCY STOP button or turn the VARIABLE SPEED CONTROL DIAL co...

Страница 19: ...ects Regardless of the con tent in this section Grizzly Industrial will not be held liable for accidents caused by lack of training Speed Power Controls It is important to know all of the controls on the G8688 before operation Use Figures 11 12 as a guide Figure 11 Power controls and features A B C D A VARIABLE SPEED CONTROL DIAL Controls the spindle speed range from 0 2500 RPMs B Fuse Socket Hous...

Страница 20: ... lathe is running Chuck Jaws The 3 jaw chuck supplied with the lathe comes with 2 sets of jaws which are depicted in Figure 13 These are commonly known as the internal and external jaws The internal jaw can hold a workpiece on the inside or outside surface of the jaw exterior or interior of the part The exter nal jaw holds the part from the inside surface of the jaw exterior of the part Common use...

Страница 21: ...turn until the jaw is engaged with the lead thread 9 Repeat these steps for Jaw 2 then Jaw 3 It is important to follow these points when replac ing jaws in your 3 jaw chuck The jaws must be loaded in sequence begin ning with the 1 jaw The chuck scroll and jaws should be thor oughly cleaned before assembly A paint brush works great for cleaning the scroll Never use a combination of inside and out s...

Страница 22: ...e sure that the studs extend at least 1 2 from the chuck or faceplate see Figure 16 PINCH HAZARD Protect your hands and preci sion ground bedways with plywood when removing lathe chuck The heavy weight of a falling chuck can cause serious injury Figure 17 Installing the faceplate 3 Hold the chuck faceplate with your hand or a chuck key and use a 10mm wrench to loosen and remove the three chuck mou...

Страница 23: ...17mm wrench loosen the tailstock lock nut shown in Figure 18 2 Slide the tailstock into position along the bed then tighten the clamp nut to secure the tailstock in the new position Offset Positioning Changing the tailstock offset is a common meth od for turning tapers The offset cap screw is located under the tailstock and the tailstock must be removed from the bed for this adjust ment Therefore ...

Страница 24: ...move the tailstock quill all the way back into the tailstock This will push the dead center out of the quill Dead Center Tool Post The tool post can rotate to four 90 degree preset stops or at any angle in between and hold a maxi mum of four tools at a time To use the tool post 1 Select a cutting tool that will produce the desired cut 2 Secure the tool with a minimum of two cap screws with as litt...

Страница 25: ... finger position can be adjusted to fit around the outer diameter of the part 4 Place the workpiece so it can fit inside the fin gers Secure the two ends of the workpiece with the chuck and dead center or between two centers as required see Figure 21 Figure 20 Installing steady rest 5 Position the steady rest where desired Tighten the bolt at base of the steady rest to secure in place 6 Set finger...

Страница 26: ...he cross slide the compound slide features a scale that displays graduations of one thousandths of an inch 0 001 Unlike the cross slide the compound slide can be rotated to a set angle and then it can be moved back and forth along the axis of that angle To adjust the compound slide 1 Loosen the compound slide bolts shown in Figure 23 to allow it to be rotated Compound Slide Cross Slide Figure 22 C...

Страница 27: ...eed lever The lathe comes from the factory set up for normal turning Gear changes for thread cutting will be covered later CRASHING HAZARD Pay close attention to feed rate before engaging power feed Be alert and ready to shut OFF power feed otherwise carriage will crash into rotat ing spindle causing damage and possible injury To use the automatic carriage feed for normal turning 1 Use the manual ...

Страница 28: ...rt TPI mm pitch Gear A B C D 0 4 20 50 40 60 0 5 20 50 60 0 6 40 50 30 60 0 7 40 50 35 60 0 8 40 50 40 60 1 0 20 60 30 1 25 50 40 60 1 5 40 60 40 1 75 35 60 30 2 0 40 60 30 Figure 26 Metric thread pitch chart Figure 27 shows the locations of the gears refer enced in the gear charts Figures 25 26 For example if you wanted to cut a 1 2 x 13 thread on a piece of round stock 1 UNPLUG THE LATHE 2 Remov...

Страница 29: ...7 48 1 8 52 1 3 5 7 Figure 28 G8688 Thread dial chart 6 Once you are confident the settings are cor rect disengage the feed lever and turn the spindle OFF 7 Examine the thread dial chart in Figure 28 to determine which numbers on the thread dial to engage the feed lever Note There are a total of eight marks on the thread dial ranging 1 8 To maintain accu racy and consistency engage the half nut on...

Страница 30: ...ng run out on lathes blades etc to 0 001 resolution Figure 30 Dial Indicator Figure 32 Live center G5685 MT 1 Live Center G5686 MT 2 Live Center G5687 MT 3 Live Center Perfect for just about any turning requirement these dust chip and oil proof live centers feature 60 included angle and pre loaded taper bear ings T20501 Face Shield Crown Protector 4 T20502 Face Shield Crown Protector 7 T20503 Face...

Страница 31: ...able tool bits around Make your own specialized cutters in any shape using a silicon carbide grinding wheel G8235 37 on your grinder H5690 8 Pc Pre Ground Tool Bit Set Tired of grinding your blank high speed steel tool bits We ve done it for you 8 pc set comes with these sharpened profiles offset right and left hand tools with chip breaker straight and chip breaker style threading tools internal t...

Страница 32: ... front control panel remove ground wire screw in head stock spray grease in hole while rotating chuck by hand and shifting gears between High and Low Lubrication Cleaning the Model G8688 is relatively easy Remove all chips at the end of the day Wipe up any coolant used that settled in the bottom of the chip tray or has settled on any other part of the lathe Dry off entire machine with a clean dry ...

Страница 33: ...ype of machining 2 Inspect and replace if faulty 3 Test and replace if faulty 4 Remove brushes and clean replace refer to Page 35 5 Replace loose pulley shaft 6 Test by rotating shaft rotational grinding loose shaft requires bearing replacement 7 Use sharp lathe bits chisels at correct angle reduce feed rate depth of cut use cutting fluid if possible 8 Turn switch to FWD OFF REV replace bad switch...

Страница 34: ...eel fasteners 3 Tighten any loose fasteners on lead screw mecha nism Cross slide compound slide or carriage feed handwheel is hard to move 1 Gibs are loaded up with shavings dust or grime 2 Gib screws are too tight 3 Backlash setting too tight cross slide only 4 Bedways are dry 1 Remove gibs clean ways dovetails lubricate and readjust gibs 2 Loosen gib screw s slightly and lubricate bedways 3 Slig...

Страница 35: ... sure that stops are floating and not hitting the center stop 5 Loosen gib screw s slightly Gear change levers will not shift into position 1 Gears not aligned in headstock 1 Rotate spindle by hand until gear falls into place Loud repetitious noise coming from machine 1 Gears not aligned in headstock or no backlash 2 Broken gear or bad bearing 3 Workpiece is hitting stationary object 1 Adjust gear...

Страница 36: ... of gib adjustment is to remove unnecessary movement from the slides without causing them to bind Loose gibs may cause poor finishes on the workpiece and undue wear on the slide nut and lead screw Over tightening will make turning the handwheel difficult Tools Needed Qty Hex Wrench 2mm 1 Wrench 7mm 1 To perform this procedure for the cross slide gib and the compound slide gib 1 UNPLUG THE MACHINE ...

Страница 37: ...e aligned after adjusting for offset See Page 22 for instructions To align the tailstock 1 Center drill a 6 long piece of round cold rolled stock on both ends Set it aside for use in Step 4 2 Make a dead center by turning a 60 point on a piece of scrap material Figure 39 Note As long as it remains in the chuck the point of your new center will be accurate to your spindle axis Keep in mind the poin...

Страница 38: ...igure 42 Figure 41 Adjusting for headstock end taper Adjust the tailstock half the distance of the taper 7 Adjust the tailstock offset by half the amount of the taper Turn another 0 010 off of the stock and check for a taper Repeat as nec essary until the desired amount of accuracy is achieved Notice DO NOT forget to lock down the tailstock after each adjustment Failure to follow this notice may c...

Страница 39: ...ts Figure 43 G8688 Fuse location Emergency Stop Switch Fuse RPM Dial F O R Toggle Figure 44 G8688 Motor location Rear Motor Brush Figure 45 G8688 Wiring Diagram RPM Dial F O R Spindle Toggle Emergency Stop Switch Motor Fuse Printed Circuit Board ...

Страница 40: ...24 23 22 21 13 12 14 10 8 8 129 110 133 134 168 126 67 67 125 85 131 119 136 137 83 141 135 138 139 142 143 144 145 146 140 84 63 169 124 123 178 6 5 4 3 1 6 2 7 20 19 154 155 156 29 28 27 23 34 33 30 31 28 18 150 148 172 32 151 40 40 39 51 50 97 92 92 93 94 67 177 176 128 127 115 175 174 116 114 105 106 90 90 122 179 18 91 18 94 99 99 183 72 73 74 74 76 77 102 100 180 181 130 182 204 203 120 202 ...

Страница 41: ...8M CAP SCREW M4 7 X 8 24 P8688024 H L GEAR 12T 20T 74 P8688074 SHAFT 25 PK71M KEY 4 X 4 X 45 75 P8688075 HALF NUT BASE 26 P8688026 H L GEAR SHAFT 76 P8688076 ANGLE BLOCK 27 P8688027 PULLEY 77 PFH19M FLAT HD SCR M4 7 X 10 28 PR01M EXT RETAINING RING 10MM 78 P8688078 GROOVE CAM 29 P8688029 TIMING BELT LX136 79 P8688079 HANDLE 30 P8689141 BAR 80 P8688080 SHAFT 31 P8688031 SHIFTING ARM 81 P8688081 FEE...

Страница 42: ...T RETAINING RING 7MM 128 PK52M KEY 3 X 3 X 15 173 PS09M PHLP HD SCR M5 8 X 10 129 P8688129 LEAD SCREW 174 P8688174 PROTECTOR 130 P8688130 INDICATOR TABLE LABEL 175 PSB50M CAP SCREW M5 8 X 10 131 P8688131 BRACKET 176 PN01M HEX NUT M6 1 133 PSB56M CAP SCREW M3 5 X 10 177 PSB06M CAP SCREW M6 1 X 25 134 P8688134 RACK 178 P05161137 E STOP SWITCH 135 P8688135 CLAMP PLATE 179 P8689136 FUSE BOX 136 PW04M ...

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Страница 45: ...D LINE FOLD ALONG DOTTED LINE GRIZZLY INDUSTRIAL INC P O BOX 2069 BELLINGHAM WA 98227 2069 Place Stamp Here Name_______________________________ Street_______________________________ City______________State______Zip______ Send a Grizzly Catalog to a friend ...

Страница 46: ...r metalworker ____ 0 2 Years ____ 2 8 Years ____ 8 20 Years ____20 Years 6 How many of your machines or tools are Grizzly ____ 0 2 ____ 3 5 ____ 6 9 ____10 7 Do you think your machine represents a good value _____Yes _____No 8 Would you recommend Grizzly Industrial to a friend _____Yes _____No 9 Would you allow us to use your name as a reference for Grizzly customers in your area Note We never use...

Страница 47: ...zzly shall be tried in the State of Washington County of Whatcom We shall in no event be liable for death injuries to persons or property or for incidental contingent special or consequential damages arising from the use of our products To take advantage of this warranty contact us by mail or phone and give us all the details We will then issue you a Return Number which must be clearly posted on t...

Страница 48: ...Buy Direct and Save with Grizzly Trusted Proven and a Great Value Since 1983 ORDER 24 HOURS A DAY 1 800 523 4777 Visit Our Website Today For Current Specials ...

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