Marvel 3165 Operation manual

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40#North#2nd#Street#
Stroudsburg,#PA#18360#USA#
570<421<6221#

!!!!!!!!!!!!!!!!!!!!!!!!!!!The$Marvel$Manufacturing$Company$copyright$2017!
2!
Operation#and#Service#Instruction##
No.#3165#Balance#Indicator#Arbor#
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General#
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The#3165#Balance#Indicator#Arbor,#which#mounts#assemblies#to#be#balance#
checked#with#suitable#adapters,#is#of#the#horizontal#suspension#static#type#
featuring#high#accuracy#with#sensitivity#of#indication#which#can#be#adjusted#to#
meet#requirements#of#the#wide#range#of#part#weights#within#its#100#pound#
capacity#limit.#Balance#indicator#movement#is#oil#damped#to#minimize#oscillation#
and#time#to#determine#a#balance#condition.#The#shaft#of#the#arbor#incorporates#an#
inch#scale#marking#which#correlates#to#the#“sensitivity#setting”#noted#in#
individual#balance#procedure#instruction#for#positioning#mount#adapters#to#
produce#a#correct#sensitivity#setting#for#the#part#to#be#balance#checked.##
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Balance#Indication#
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The#characteristic#response#of#the#suspended#balance#indicator#arbor#to#be#an#
installed#unbalanced#part#is#a#tilting#action#of#the#arbor#shaft#section#relative#to#
the#central#suspension#rod,#with#the#direction#of#tilt#toward#the#heavy#point#in#the#
part.#This#movement#is#visually#evident#as#the#edge#of#the#black#disc#in#the#end#of#
the#arbor#shaft#moves#eccentric#to#the#edge#of#a#round#(silver#colored)#collar#
attached#to#the#central#suspension#rod.#A#perfectly#balanced#part#mounted#on#the#
balance#indicator#arbor#at#the#sensitivity#setting#specified#for#the#part#will#indicate#
an#exact#balance,#having#an#equal#and#concentric#width#of#black#disc#exposed#
around#the#edge#of#the#indicator#collar.#If#the#part#were#out#of#balance,#the#
exposed#ring#of#the#black#disc#would#become#eccentric#with#its#eccentricity#
increasing#if#the#unbalance#were#increased.#When#a#properly#established#
sensitivity#setting#is#used#a#part#which#is#out#of#balance#to#its#maximum#allowable#
tolerance#would#cause#the#edge#of#the#disc#to#become#tangent#to#the#edge#of#the#
collar.#Unbalance#beyond#this#limit#would#cause#the#disc#edge#to#pass#under#the#
collar#edge.##
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A#balanced#part#installed#too#high#on#the#arbor#would#cause#the#arbor#to#become#
unstable#and#could#not#indicate#central#but#would#stay#at#the#limit#of#its#travel#in#
any#direction#pushed.##
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A#balanced#part#installed#too#low#on#the#arbor#would#indicate#an#exact#balance#
but#would#not#move#to#a#tangent#position#were#an#unbalance#equal#to#its#
allowable#limit#was#added.##

!!!!!!!!!!!!!!!!!!!!!!!!!!!The$Marvel$Manufacturing$Company$copyright$2017!
3!
Preparation#for#Use#
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Remove#the#3165#Arbor#from#its#kit#case#and,#if#present,#disassemble#stored#
adapters#from#its#shaft.#Stand#upright#in#bore#of#case.##
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As#shipped,#the#top#end#of#the#arbor#assembly#is#sealed#by#an#internal,#spring#
loaded#seal#located#on#the#suspension#rod#under#the#indicator#bushing.#In#
addition#to#preventing#loss#of#dash#pot#damping#oil,#this#seal#also#supports#the#
suspension#rod#in#a#fixed#position#in#the#arbor#during#shipment#or#storage.#To#
unseat#the#spring#loaded#seal#and#free#the#suspension#rod#for#normal#operation,#
push#the#indicator#bushing#downward,#against#the#spring#loaded#pressure,#so#
that#its#bottom#surface#clears#the#black#indicator#disc#by#approximately#0.003#
inch.##
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Release#the#indicator#collar,#if#stored#depressed,#and#Clean#the#arbor#shaft,#
indicator#surface#at#its#upper#(top)#end#of#arbor#shaft#and#the#adjacent#indicator#
collar.#Depress#the#indicator#collar#to#release#the#damping#oil#internal#seal#and#
position#to#a#clearance#of#.004”#<#.006”#with#the#arbor#end.#Secure#lightly#with#its#
set#screw#and#check#for#free#movement#over#its#full#range#of#travel.##
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NOTE:#Prior#to#storing#arbor#in#kit#case#after#use,#release#indicator#collar#to#allow#
oil#seal#to#move#upward#and#seat.#It#is#not#necessary#to#retighten#set#
screw.##
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Check#the#circular#gap#between#the#upper#unit#of#the#arbor#and#the#tapered#
protector#sleeve#above#the#indicator#collar#for#foreign#material#and#clearance.#The#
set#screw#in#the#protector#sleeve#may#be#loosened#to#lower#sleeve#for#cleaning.#A#
cloth#dampened#with#mineral#spirit#type#solvent#may#be#used#but#do#not#immerse#
the#arbor#in#solvent#at#any#time.#Reposition#the#protector#sleeve#to#provide#a#gap#
of#.005”#<#.008”#when#the#arbor#is#suspended#by#the#cable#loop#(or#quick#
disconnect#coupling)#and#secure#sleeve#in#place#with#the#setscrew.##
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Balance'Indicator'Damping'
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Damping#to#control#oscillation#of#indicator#movement#is#produced#by#dash#pot#
action#of#a#light#viscosity#“baby#oil”,#contained#within#the#arbor#shaft.#Oil#can#be#
added#or#removed#thru#the#two#screw#sealed#bores#in#the#wall#of#the#arbor#shaft#
to#adjust#this#action#to#give#good#indicator#movement#but#resist#excessive#
oscillation#when#balancing.##
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Use#of#heavier#oil#for#damping#or#if#an#oil#has#created#a#deposit#within#the#arbor,#
the#indicator#will#tend#to#adhere#at#its#extreme#displaced#positions.#This#can#be#
corrected#by#removing#the#sealing#screws#and#draining#all#of#the#oil.#Flush#well#
internally#with#a#mineral#spirit#type#solvent.#Do#not#flood#the#area#above#the#

!!!!!!!!!!!!!!!!!!!!!!!!!!!The$Marvel$Manufacturing$Company$copyright$2017!
4!
indicator#collar#or#immerse#the#arbor#in#solvent#at#any#time.#Refill#to#the#upper#
seal#screw#bore#and#reseal.#$
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