Page 31 of Airetool Tube Cleaners & Expanders by Cooper Power Tools

boiler expanders airetool boiler expanders boiler expander accessories application boiler tube expanders b-2000 series patented thrusts assembly airetool b-2000 series boiler tube expander with its exclusive drift thrust assembly represents a major advancement in boiler tube expanding using a ball bearing spring loaded drift thrust collar the b-2000 series expanders can be accurately positioned in the boiler tube in relation to the drum for consistent joint expansion in operation the initial positioning of the expander in the tube allows the self-feed rolls to draw the expander into the tube and to engage the flaring rolls at the proper point during the operation the use of either an electric or air driven torque controlled rolling motor with the b-2000 series expanders produces more uniform flares and very precise tube wall reduction accomplishes three unique functions in one operation b-2000 expander as first operation tool in thick drums or tube sheets b-3000 expander as second operation tool in thick drums or tube sheets b-1000 type expander parallel gear drive b-1000 type expander type b extension short series mandrel 140° minimum angle short series mandrel b-1000 type expander drum mandrel single u-joint type b extension adapter sleeve b-1000 type expander with short series mandrel when tube bends are near tube sheet b-1000 type with header mandrel b-1000 type with short series mandrel single u-joint short series mandrel b-1000 type expander type b extension short series mandrel b-1000 type expander first the unique depth adjustable ball bearing drift thrust collar enables the b-2000 series expander to be positioned into the tube at exactly the same setting every time once set the mandrel is inserted in the expander causing the rolls to be forced outward into contact with the tube i.d starting the rolling process second as the mandrel is rotated the initial rolling of the straight section takes place as the mandrel rotation is continued the drift thrust collar stops the expander at its final operating depth in the tube during this phase the flaring rolls have also moved into their final depth position third continued mandrel rotation now will allow the straight rolled area to be finished at this point the amount of torque required is greatly increased the torque mechanism in the motor measures the torque and when the set torque is reached the motor automatically shuts off during this phase the expander being held in place by the thrust collar allows the flare rolls to iron out the end of the tube to a smooth and precisely located flare after shut-off reversing the motor will back the expander out of the finished tube while at the same time resetting it for the next tube right angle drive parallel gear drive 56 57

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