Machined Features and Tolerances

The critical machined features on the snubber arm are--

1. the keyed shaft bore on the main hub. 
   

2. the stepped bores for the sleeve bearings in the fork section. 
   

3. the machined outer faces on the main hub and on the fork sections. 
   

4. the two tapped bolt holes for the cover cap on the main hub.

The snubber arm must be free of internal porosity and cracks to meet the mechanical requirements. 

The as-cast dimensional tolerance is +/- 0.12". 

The as-cast surface finish requirement is 500 RMS.