Hercus 260 User manual

260LATHE
MIAINTENANCE MANUAL

J MAINTENANCE MANUAL
^ HERCUS260TLATHE
This Manualis intendedtogive guidelinesforthe regular maintenanceoftheLathe,
togetherwith detailsof recommended proceduresforthe replacementofparts.In
particular,theManualisdirectedtowardsthetechnicaleducationalenvironmentwhere
the machineis subjectedto continualuseby differentoperatorswhoarenotalways
familiarwithnormal machine-careprocedures.
Contents
1/ GoodoperatingproceduresPage 2
2/ LubricationPage 3
3/ ChecksandadjustmentsPage 4
4/ ReplacementofParts —
(a)CrossFeedNut
(b) CompoundRestNut
(c)CrossFeedorCompoundRestScrew— includingprocedurefor
Eliminationofwearonexisting parts
(d) HeadstockSpindlePage 6
(e)BackGear
(f) DriveBeltfromyoke
5/ Appendix A
AssemblyDrawings
Appendix B
MaintenanceToolDrawings
Appendix C
Listofothermaterialon260 Lathe
1

GOODOPERATING PROCEDURES
1/ Donotresttoolsonthebedorslideways
2/ Keepthebedandslidescleanandfreefromswarfandmoisture
3/ Alwayscleanthespindlenoseand matingcomponentbeforemounting
4/ DoNOTleavethekeyinthelathechuck
5/ Whenremovingchucksfromthespindle, engagethebackgeartolockthespindle.
If thechuckistight,usea barbetweenthejawswithanevenpressuretoloosen.
6/ DoNOTengagegearswhilstthemachineisrunning.

LUBRICATION
The oiling pointsare illustratedonthe photographfromthe "TextBookof Turning"
reproducedbelow.Wheninregularuse,allpointsshouldbeoileddailywitha fewdrops
andthe excesswipedoff.
A-
B-
C-
D-
E-
F-
G-
H-
1-
J-
K-
Rear Leadscrew Bearing
Tailstock Handwheel Bearing
Tailstock Screw
Tailstock Clamp(atbackof
Tailstock)
CompoundRest Screw Bearing
CrossFeed Screw Bearing
Apron Handwheel Bearings
Rack Pinion Bearing
Worm Drive
CrossFeed Pinion Bearings
HalfNutCam
L
M
N
0
P
Q
R
S
T
U
V
—
—
—
—
—
—
—
—
—
—
*R
HalfNuts
Back Gear*
Cone Pulley*
FrontBackGearSpindle Bearings
FrontMain Spindle Bearing!
RearBackGear Spindle Bearing
RearMain Spindle Bearing
Reverse Shaft Bearing
Gearbox
Twin Reverse Gears(2)
IdlerGear Bearings
emove screwtooil
tFill untiloil remainsin bottomofelbow
Oil shouldalsobe appliedatthesame intervaltothebed ways,the cross slideand
compoundrestdovetails,thetailstockbarrel,theleadscrewthreadsandthebackgear
andchangegearteeth.Every5 or6 days,oilshouldalsobeappliedtothecountershaft
yoke pivot pointsandthebelttensioning eccentricshaft.
Recommendedlubricantsarelistedbelow: —
Supplier
MOBILOIL AUST.
CALTEXOIL (AUST.)PTY.LTD.
SHELLCO.OF AUST.
AMPOL PETROLEUMLTD.
CASTROLLTD.
H. C. SLEIGHLTD.
B.P. AUST.LTD.
NEPTUNEOILCO.
RecommendedOil
MobilVactraOilHeavy
RegalOilP.C.(R.& 0)
VitreaOil33
GernolOil37
PerfectoR.R.
PurolHeavy Medium
B.P.EnergolH.P.30
P. 13
•
3

CHECKSANDADJUSTMENTS
The following adjustments shouldbe checked periodicallytoensure troublefree
operations:—
1/ BeltTension
Themotorand drive beltsshouldbechecked regularlyforcorrecttensioning.The
belt tensionis correctlysetwhena light finger pressuremidwaybetweenthe
pulleyswillgive a deflectionof10-13mm.Thedrivebelttensionisadjustedbythe
knobattherearofthedriveunit.Themotorbelttensionisadjustedbyslackening
themotorbasestrapandre-clampinginthecorrectposition.
2/ BackGearTensioningScrew
This screwis locatedinthe frontarmofthe headstockabovethebackgear
eccentric.Itshouldbesetsothatthereissufficientresistancetothemovementof
thebackgear leverto preventits movingoutofmeshwheninuse.A 5/32A/F
hexagonkeyisrequiredforthisoperation.
3/ RearSaddleKeepPlate
Two hexagonheadscrewswithspringwashersattachthiskeepplatetotherearof
the saddle.The correctsettingforthiskeep plateis obtainedbytighteningboth
screwsandthenbackingeachoffbyhalfa turn.
4/ FrontSaddleLockScrew
Thisshouldbefingertightfornormaluseandonlytightenedwhenthesaddleisto
be locked.
5/ TailstockClampBolt
Thisshouldbesettogivea clampingpositionwiththehandleatabout60°fromthe
horizontal.Toadjust,removethetailstockfromthebedandresetthepositionofthe
boltintheclampnut.
6/ CrossSlideandCompoundRestGibs
Thegibsareadjustedusingthegibspanner{DrawingM6— AppendixB)andscrew
driver.Withthescrewdriverinthegibscrew, slackenthelocknut,adjustthegib
screwandre-tighteneachlocknutinturn.Whenproperlyset,theslideshouldmove
smoothlywithnoslack.
7/ FasteningScrews
To prevent problems arisingfrom screwsand componentsworkingloose, regular
tighteningofthefollowingscrewsshouldbemadeevery3 months:—
a/
b/
c/
d/
e/
f/
g/
MotorPulleyScrew —
CountershaftDrivePulleyScrew —
CountershaftConePulleyScrew —
GearboxRetainingScrews —
LeadscrewBearing BracketScrews —
RackRetaining Screws —
SaddletoApronScrews —
using5/32A/FHexagonKey
using5/32A/FHexagonKey
using5/32A/FHexagonKey
using7/32A/FHexagonKey
using7/32A/FHexagonKey
using3/32A/FHexagonKey
using5/16A/FHexagonKey
4

REPLACEMENTOFPARTS
CrossFeedNut
Windthecrossslideforwarduntilthenutcomesoffthescrew
Loosenthelockingscrewandremovethenut
Transferthelockingpinandscrewtothenewnut
Insertthenew nut inthecrossslide
Engagethescrewinthenutandwindthecrossslideforwardasfaraspossible
Backoffoneturnandtightenthelockingscrew.
CompoundRestNut
Windtheslidebackasfaraspossible.Usea "C"spannertoremovethecompound
restscrewassembly.
Loosenthenutlockingscrewandremovethenut
Insertthenewnut
Replacethecompoundrestscrewassembly
Windtheslidefullyforward
Backoffoneturnandtightenthelockingscrew
CrossFeedorCompoundRestScrew
(Thesameprocedurecanbeusedtoeliminatewearonanexistingscrew)
The Screw Assemblyis removedasone unit,
usinga "C"spanner(DrawingM6- AppendixB)
andthen taken apart. Ifnew partsare being
fitted,thentheyare substitutedfortheworn
parts.
When re-assemblinga shim washer"A"ofapp.
0.03mm (0.0012")is placed betweenthe
graduated collarandthefaceofthe bushing.
Thescrewis pushedhardintothebushing,the
graduated collar pushedhard againsttheshim
washerand securedwiththelock screw"B".
Theshankofthescrewisthengrippedina 3 jaw
chuckina latheanda lightcuttakenacrossthe
faceof"C".Theshimisthen removedandthe
unitre-assembledandreplaced.
When another latheisnot availableto carryoutthis operationontheCrossFeed
Screw, clampthe crossslidebytighteningonegibscrewandusethe compound
restsetat90°totakethefacingcut.WhenoperatingontheCompoundRestScrew,
clampthatslidebytighteningonegibscrew.
2/
1 /
3/

ProcedureforremovingandreplacingHeadstockSpindleforreplacinganypart
requiringthisoperation
Thisisthe preferred procedureusingthespindlepullerdetailsofwhicharegiven
onDrawingsM4andM5inAppendix"B".
An alternativemethodisgivenintheTextBookofTurning.
Thefrontandrearbearingcapsareremovedandthetake-upnutunscrewedusing
the"C"spannerillustratedon DrawingM6.
To removethe spindle,placethe pullerin positionas showninDrawingM1and
tightenthepullernut(2)topullthespindleclearoftherearbearingconeandbull
gear.Thepullernutisthenremovedandthespindlecompletelywithdrawn.
To replacethespindle,insertitthroughthebullgearandconepulley,liningupthe
bullgearkeyway. PositionthepullerasshowninDrawingM2andtightenthepuller
nut(2)topullthe spindle throughthebull gear.Thenutandspacerarethen
removedandthespacingcollarplacedonthespindleandturneduntilthekeyway
springengagesinthekeyway.
TherearbearingisthenpulledonasshowninDrawingM3.
Finally,thefrontandrear bearingcapsare replacedandthetakenutscrewedon
andtightenedtogivetherecommendedpreloadof0.2 Newtonmetresandthelock
screwtightened.
ProcedureforremovingandreplacingtheBackGearShaftforreplacinganypart
requiringthisoperation.ReferDrawingA1- Appendix A
Slackenoffthebackgear tension screw (138)and removethebackgear lever
adjustingscrew(141).(Itisadvisabletoloosenthenut(142)justsufficientlytofree
the screwandthentakethetwooffasoneunittogivea guidetothe correct
positioningwhen re-assembling). Driveoutspringpin(135)and removetheback
gearlever(136)togetherwiththebackgearshaft(133).
To re-assemble,insertthebackgearleverandshaft,andreplacethespringpin.The
adjustingscrewandnutarethenreplacedandlockedinpositiontogivethecorrect
gearbacklashandthetensionscrewre-set.
Procedureforfittinga beltoverthecountershaft.DrawingA36- Appendix A
(Early model machineshada one pieceyokeandthe procedureinthiscaseis
outlinedintheTextBookofTurning)
Firstly removethe DrivePulley(216), loosenthe lockingscrew(226)andtapthe
pivotshaft(225)outtowardsthetailstockuntilitclearstheleft-handyokesection.
Removethe clampingscrew(204)and swingthe left-handyoke section(209)
forwarduntilitisabovethecountershaft(211).Thebeltmaythenbefittedoverthe
cone pulley (212)
Re-assemblebyswingingtheyokesectionbackintoposition,replacingtheclamping
screw, tapping the pivotshaftbackinto position, lockingitwiththescrewand
replacingthedrivingpulley.
6
4/
5/
6/

APPENDIX"A"AssemblyDrawings
A1 T Headstock
A5 Reverse Bracket
A6 Tailstock
A9 AM Gearbox
A12,A18,A23AMApron,SaddleandCompoundRest
A14CMApron
A36TDriveUnit

APPENDIX"B"MaintenanceToolDrawings
M1 RemoveSpindlewithPuller
M2 ReplacingSpindlewithPuller— Stage 1
M3 ReplacingSpindlewithPuller— Stage 2
M4,M 5 DetailsofSpindlePuller
M6 DetailsofSpecialSpanners