Off-center Bores, Taking Center Stage.

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Brief 

A precision manufacturer of aeronautic and aviation components needs to turn a bore that is off-center from the outer diameter of their part. 

The Challenge  

This operation needs to be performed on four different part sizes using the same chuck, whilst maintaining the tolerance to the existing ground ‘Datum’ on the part’s face. 

Solution 

Custom_Northfield_470W_Chuck
Custom Northfield 470W Chuck

Custom Northfield Precision Model 470WHS Sliding-Jaw Air Chuck (0.0001” TIR) with custom offset top tooling. 

The customer has four different offset parts that all need to be held with the same chuck. To accomplish the brief, we created four sets of quick-change stops and inserts. The different sets of inserts mount to hardened and ground sub jaws. This design offers accuracy and repeatability alongside quick change over times.

Custom ground sub jaw set
Custom ground jaw set

The hardened insert’s bores are ground off-center to compensate for the parts offset feature. The stops have quick change tapers to center the tooling during change overs. Within these changeable stops we also ‘time’ the part using locating pins. This ensures the proper offset orientation of the part.  

Additionally, the Model 470W chuck’s rotary union has 3 passages. One of these drives an air-driven ejector within the stop. This pushes the part out, against a separate stop component, to establish the accurate datum location.  

Custom Northfield 470W without Part
Custom Northfield 470W without Part
Custom Northfield 470W with Part
Custom Northfield 470W with Part

 

 

 

 

 

 

 

 

 

Do you have a tricky part to machine? Contact us to see how we can help.  

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