phase II+ 220-006 - Operation: Rotary Table; Dividing Plate Accessory

OperatingInstructions&PartsManual
 HorizontalRotaryTables
 DividingPlates
Pg. 4
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Operation:RotaryTable
RefertoFigures4thru8.
1. Alwaysrotatehandwheel(Ref.No.46)clockwise.Thiswilleliminateanybacklashinthewormgear.Ifhandwheelis
rotatedpastdesiredposition,rotatehandwheelonefullturncounterclockwiseandthenrotatehandwheelclockwiseto
desiredposition.
2. Thewormshaft(Ref.No.31)canbedisengagedfromthetable(Ref.No2)sothatoperatorcanrotatetablebyhand.
Loosenhandle(Ref.No.25)byturningitcounterclockwise,loosenhandle(Ref.No39)andturnverniercollar(Ref.No
40)clockwiseuntilitissnug.Tablecannowberotatedbyhand.Toengagewormshaft,turnbackverniercollar.Secure
handle(Ref.No.25)
3. Tableislockedintopositionbyrotatingclamphandles(Ref.No.7)clockwiseuntilsnug.Turnhandlescounterclockwiseto
freetable.Turningthehandle(Ref.No.47)afterlooseninghandle(Ref.No.39)rotatesthetable.
4. Thetableisprovidedwithascaletoindicatetheangleofrotation.Theindicator(Ref.No.22)canbeusedtoverifythe
angleofrotationonscale.Theindicatorcanbeadjustedbylooseningtheknob(Ref.No.23)andmovingtheindicatoralong
theslot.Secureknobaftercompletingadjustment.
5. ThecentersleevehasbeengroundtoaMorseTaper.CenterswithaMorseTapershankcanbemountedtotherotary
tableforprecisioncenteringandmeasuringoperations.(seedimensionsinFig.1forMTofea.table.)
6. Thegearratiooftherotarytableis1:90sothat90rotationsofthehandwheelrotateexactlyonefullrotation.Onerotation
ofthehandwheelisequalto4rotationofthetable.Themicrocollarisgraduatedintooneminuteincrements.
7. Avernierscaleisprovidedontheverniercollar(Ref.No.40)formeasurementofanglerotationtoanaccuracyoften
seconds.
8. Readthedegreesandminutesfromthemicrocollarandusetheverniercollarscaletoreadtenseconds.
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DividingPlateAccessory
RefertoFigures2,3,and4,5,or6
Thedividingplateaccessory(241‐101)isusedtodivideone360tablerotationinto2‐66andalldivisibleby2,3,and5from
67‐132equaldivisions.Thegearratiooftherotarytableis1:90so90rotationsofthehandwheelrotatetableonefullrotation.
Thereforeforonefullrotationofthetable,thenumberofhandwheelrotationsperdivisions"N"timesthenumberofdivisions
"T"isequalto90rotationsofthehandwheel.SoNxT=90orN=90T.Thedividingchart(page4)wasdevelopedusingthis
relationship.
Forexampleif17divisionsarerequired,thenT=17,soN=
90
/
17
=5
5
/
17
=5
10
/
34
.
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Eachofthe17divisionsrequires5fullhandwheelrotationsand
10
/
34
ofonehandwheelrotation.The
10
/
34
ofahandwheel
rotationisobtainedbyusingthedividingplates.
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Thedividingplateshavebeenprovidedwithannularholespermittingrequirednumberofdivisionsofonehandwheel
rotation.
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Thereare2plateseachwith2facesforatotalof4differentfaceswithdifferentholecombinations.Intheexampletheplate
with34holesdrilledinacircleisrequired.
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Toobtain17divisionsthehandwheelisrotated5fullrotationsand10holesonthe34holecircleforeachdivision.Thesector
isusedtomakethe10holerotationquickandeasy.
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SEEREVISEDDIVISIONCHARTTOWARDSTHEBACKOFTHISMANUAL!