NUTOOL NBD350 - Belt Tension; Maintenance

30
GB
USING THE “MORSE TAPER” SYSTEM DRILL BITS
(PICS. 24 & 25)
The “Morse Taper” system
This drill can accommodate larger drill bits than the chuck
capacity.IndustryusestheMorsetapersystemtofitdrillbits.
The “Morse Taper” system is a method of securing an external
(male) taper securely into an internal (female) tapered drive
shaft.Thesetapersarereferredtoasselfholdingbecausethey
stay in place when correctly seated. This system allows the
easychangingofchucksanddrillbits.Theinternalandexternal
tapers are ground at an angle that allows the two tapers to
locktogether. Variousaccessories including chucks, drill bits,
reamers and adaptor sleeves with various size of “Morse Taper”
shankcanbeobtained.AMorsetaperaccessorywillcomprise
thecutter (Pic.24)(24.1),Morsetaper shank(Pic.24)(24.2)
andatang(Pic.24)(24.3).Therearetwoshortverticalejector
slots machined in each side of the drive spindle and the drive
spindlehousing(Pic.25)(25.1).Thisallowstheuseofa“Drift”
to“Break”releasethetaperlock.
To remove the chuck or Morse taper drill bit, lower the drive
spindleandholdinposition.Locatetheejectorslotinthedrive
spindle housing, rotating the drive spindle until the drive spindle
ejector slots align with ejector slots in the drive spindle housing
(Pic.25)(25.1).Lookatthesideofthespindleandyouwillsee
theejectorslots(Pic.25).Thechucktangisvisiblethroughthe
ejectorslot.Tobreakthetaper,usethetapereddrift.Insertthe
driftintotheejectorslotabovethechuckordrillbittang.Using
asoftfacedhammertapthedriftuntilitbreaksthetaperfit.The
chuckandMorsetapersleevewillfalloutofthemotorspindle.
AwidevarietyofMorsetaperdrillbitsareavailablecomplete
withadaptersleeves.
NO VOLTS EMERGENCY STOP SWITCH (PIC. 26)
This machine is fitted with a “No Volts Switch”. In the event
of a mains power failure or if the mains plug is removed from
the mains supply socket before the machine is switched off.
Themachinewillnotre-startwithoutwarningwhenthemains
supply is restored or the mains plug is re-connected to the
mainssupply,untilthemachineisswitchedONattheON/OFF
switchfitted to the machine. The switch is also fitted with an
emergencystopcover.Tostartthemachine,lifttheemergency
stopcover(Pic.26)(26.1)andpressgreentheONbutton(Pic.
26)(26.2).Tostopthemachine,presstheredOFFbutton(Pic.
26)(26.3).Intheeventofanemergency,hittheemergencystop
cover(Pic.26)(26.4),thiswillswitchthemachineOFFandwill
mechanically lock the emergency stop cover in place preventing
the machine from being switched on until the mechanical lock
hasbeenreleased.Toreleasethemechanicallockdepressthe
emergencybuttonandslideitupwards(Pic.26)(26.5).
FEED DEPTH ADJUSTMENT (PIC. 27)
This facility is useful if a number of uniform depth holes are
requiredinaworkpiece.Settheworkpiecetobedrilledinyour
machinevice.Insertthedrillrequiredintothechuck.Bringthe
drill bit into contact with the work surface. Loosen the clamp
knob(Pic.27)(27.1)androtatethescalering(Pic.27)(27.2)to
thezeroposition.Selectthedepthrequiredandrotatethescale
ring to the required depth against the pointer. Re-tighten the
clampknob.Thedrillwillstopattherequireddeptheverytime.
NBD350:Usingthedepthstopnuts(Pic.27B)(27B.1)andthe
depthscale(Pic.27B)(27B.2),setthedepthofholerequired,
securethedepthstop nuts.Thedrillwillstopatthe required
deptheverytime.
CHANGING THE SPINDLE SPEED (PICS. 28 & 29)
AND CHART 1 (PAG. 15)
Unscrewthecrossheadscrewsecuringthepulleyguard.Lift
openthepulleyguardtoexposethepulleysystem.Determine
thespindlespeedrequired.Identifythepulleyarrangementthat
gives the nearest spindle speed to that required by referring to
thedrillspeedchart.Slackenthetwowingnutslocatedoneach
sideof thecasting(Pic.28)(28.1).Torelease thetensionon
thedrivebelt,movethetensionlevertotheleft(Pic.28)(28.2).
This will cause the motor, situated at the rear of the machine, to
slideontwoslidebars,releasingthetensiononthedrivebelt.To
movethedrivebelttothedesiredpulleyarrangement.Pushthe
belt on the largest drive spindle pulley towards the next smallest
pulley and at the same time rotate the drive spindle, by hand
untilthedrivebeltlocatesontothenextsmallestpulley.Repeat
this procedure on the jockey pulley and the motor pulley until the
desiredpulleyarrangementhasbeenachieved.
NBD350: Slacken the belt tension locking knob (Pic. 28B)
(28B.1). This will allow the tension on the drive belt to be
released.Themotorassemblyishingedtoallowtensioningof
thedrivebelt.
ForpulleyarrangementsseeChart1.
NOTE:Donotcrossthebelttogiveintermediatespeeds.This
willcausedamagetothemachine.
BELT TENSION
When the desired pulley arrangement has been achieved
tensionthedrivebeltbymovingthetensionlevertotheright.
To check that the correct tension has been achieved, press your
fingerontothecentreofthedrivebelt(Pic.29).Thedrivebelt
should move approximately 13mm. Re-tighten the two wing
nutstolockthemotorontothetwoslidebars.
NBD350: When the desired pulley arrangement has been
achieved tension the drive belt by moving the hinged motor
inthedirectionofthearrow(Pic.30)(30.1).Tocheckthatthe
correct tension has been achieved, press your finger onto the
centre of the drive belt (Pic. 31), the drive belt should move
approximately13mm(Pic.31)(31.1).Re-tightenthebelttension
lockingknob.
MAINTENANCE
The drill requires very little maintenance apart from keeping all
unpaintedsurfacescoatedinlightoil.
Keep the machine clear of swarf which should be disposed of in
apropermannerandnotputintohouseholdrefusebins.
Alwaysinspect andcheckthesetupandadjustments before
using the machine