NUTOOL MC550 - CHUCK FITTING AND REMOVAL (PIC.8); CHUCK JAW CHANGING (PIC.9).; EMERGENCY STOP SWITCH (PIC.15)

23
GB
OPERATING INSTRUCTIONS.
CHUCK FITTING AND REMOVAL (PIC.8)
The chuck supplied with the machine is a three jaw self centring
chuck.Thechuckissecuredtothefaceplatewiththreesocket
capscrews(Pic8)(8.1).Protectthe lathebedwitha clothor
apieceofwood.Becausethespacebetweenthebackofthe
face plate and the head stock is restricted you will need to
useacutdownhexkey.Removethethreesocketcapscrews
andremovethechuck.Re-fittingthechuckisareversalofthe
removalprocedure.
CHUCK JAW CHANGING (PIC.9).
There are two types of chuck jaw that can be used with the three
jaw self centring chuck, for gripping the work piece externally
orforhollowworkpiecesinternally.Thejawsarelocatedinto
thechuckbodybya“Tee” slot(Pic9) (9.1)andareoperated
byaspiralgear(Pic9)(9.2)locatingintoanumberofgrooves
machinedinto thebackface ofeachjaw (Pic9)(9.3).As the
chuck key is rotated the spiral gear rotates opening or closing
the jaws. When changing the jaws it is important that they
areremovedinthecorrectorder.Eachjawisidentifiedwitha
number stamped into its surface and corresponds with numbers
stamped into the jaw the locating groove in the body of the chuck
(Pic9)(9.4).Whenremovingthejawstheymustberemovedin
thesequence(3-2-1).Whenfittingthejawstheymustbefitted
inreverseorder(1-2-3).Whenthejawshavebeenfitted,fully
closethejawsandcheckthattheyareallcorrectlylocated.Ifthe
gripping surfaces do not meet together, remove the jaws and
repeattheprocedure.
COMPOUND SLIDE (PIC.10).
The compound slide can be adjusted to allow the turning of
angled surfaces and to allow the correct positioning of the
turningtoolinrelationshiptotheworkpiece.Tosettheangle
required,slackenthetwosecuringnuts(Pic10)(10.1),setthe
requiredangleusingthegraduatedscale(Pic10)(10.2)andre-
securethetwonuts.
TOOL POST (PIC11)
The tool post is mounted on top of the compound slide and can
accommodateuptofourdifferentturningtools(Pic11)(11.1).
The tool post can be rotated and locked into any position to
change to a different turning tool and to allow the correct
positioning of the turning tool in relationship to the work piece by
usingtheclampingleverlocatedontopofthetoolpost(Pic11)
(11.2).
LEAD SCREW OPERATION (PIC.12).
The lead screw (Pic12) (12.1) performs two functions. It is
primarily used when turning screw threads. When the screw
thread gear train is set up for a chosen thread size engagement
oftheleadscrewusingtheleadscrewengagementlever(Pic12)
(12.2)allowsthelongitudinalfedtooperateautomaticallyatthe
correctspeedtocutthechosenscrewthread.
Note:Theleadscrewrequiresmanualdis-engagementatthe
endofeachscrewthreadcuttingpass.
The second function is to provide automatic longitudinal drive to
thesaddlewhenperformingparallelturning.Thespeedoftravel
will be determined by the screw cutting gear train set up and the
rotationalspeedofthemainspindle.
TAIL STOCK (PIC13).
The tail stock is used to support long or thin work pieces, the
spindleismachinedwithaninternalMorsetaper.
and can accommodate a number of different types of Morse
taper centres, drilling chucks and other attachments that have a
Morsetaperfitting(Pic13)(13.1).Centresandotheraccessories
can be removed by turning the hand wheel to fully retract the
tail stock barrel, additional pressure may be required at the end
oftravelto releasethetaper.Thetail stock can alsobe“Off
Set”toallowtaperturningoverlongerlengthsthancannotbe
machinedusingthecompoundslide.
TAIL STOCK TAPER TURNING (PIC.14)
To set the tail stock for taper turning, slacken the tail stock
clampingnut(Pic14)(14.1)determinethedirectionthetailstock
hastobemovedtogivethedesiredtaper.Slackentheoffset
adjusting screw on the base of the tail, in the direction that the
tailstockistobemoved(Pic14)(14.2).Bytighteningtheother
off set adjusting screw and observing the graduated scale at
the rear of the tail stock the amount of taper can be determined
(Pic14)(14.3).
Note. Most good metal turning books will give the mathematical
formula for calculating the correct tail stock off set for a given
taperoveragivenlength.Ifthisformulaisnotavailablethen
the trial and error method on a scrap piece of material will have
tobeused.
Warning. When using the tail stock off set facility for taper
turning do not over tighten the chuck to prevent straining the
chuckjaws.
THE “MORSE TAPER” SYSTEM.
This lathe can accommodate various sizes of centres, drill
chucks, drill bits and other accessories. Industry uses the
Morsetapersystemtofitaccessoriesintodriveshaftorspindle.
The“MorseTaper”systemisamethodofsecuringanexternal
(Male)tapersecurelyintoaninternal(female)taperedshaftor
barrel.These tapers are referred to as self holding because
theystay in placewhen correctlyseated.Thissystemallows
the easy changing of dead and live centres, drill chucks, drill
bitsandotheraccessories.Theinternalandexternaltapersare
groundatananglethatallowsthetwotaperstolocktogether.
Various accessories including, centres, drill chucks, drill bits and
other accessories including adaptor sleeves to accommodate
varioussizeof“MorseTaper”shankcanbeobtained.
Note: For the “Morse Taper” system to work correctly the
internal and external tapers must not be damaged and must be
keptthoroughlyclean.
Caution. To prevent damage to the accessory or injury to the
operator carefully hold the accessory with a thick cloth or wear
welderstypegloves.