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Flat Out Pattern for Eccentric Reducer Calculation

Flat Out Pattern for Eccentric Reducer Calculation

Flat Out Pattern for Eccentric Reducer Calculation

(OP)
Does anybody know the way to determine flat out pattern of an eccentric reducer? Assuming that the small OD is 5" and big OD is 12". Thanks

RE: Flat Out Pattern for Eccentric Reducer Calculation

Wouldn't the flat out pattern be a trapezoid with one base = 5" x Pi and the other base = 12" x Pi and a length ( height ) = whatever the length of the desired reducer ? The "bases" would be parallel but not "concentric" ?  Can't you make one out of paper to see if this makes sense ?

good luck

RE: Flat Out Pattern for Eccentric Reducer Calculation

(OP)
RWF7437,

No, you way does not work out right. Yes, the base is parallel.

RE: Flat Out Pattern for Eccentric Reducer Calculation

fglass,

Your answer is ambiguous. If my way did not work out right, were you able to solve the problem by building a simple paper model ?  Seems like you should be able to.

good luck

RE: Flat Out Pattern for Eccentric Reducer Calculation

(OP)
Oh, I mean does anybody know the formula to determine the flat out pattern of an eccentric reducer by knowing the small OD, big OD and the height of a reducer? Building the paper model is tedious as we have many different sizes of eccentric reducers.

I know the way to calculate the flat out pattern of a CONCENTRIC reducer, but not for ECCENTRIC reducer.   

RE: Flat Out Pattern for Eccentric Reducer Calculation

Personally, I'd download the free version of SketchUp (which is a surface modeller), create the reducer, use the un-fold plug-in to create a flat pattern and export this as a DXF.

RE: Flat Out Pattern for Eccentric Reducer Calculation

You have to truncate the oblique cone to make an eccentric reducer.  

The page presents a visual outline of the technique, which is probably not real clear if you haven't ever done it.


Mike Halloran
Pembroke Pines, FL, USA

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