Missing a particular size of large drill ? Why hesitate, fire up your Rivett 608 and make one !
The picture above shows an early Rivett 608 fitted with the "Spiral and  Traverse Milling and Grinding Accessory" being used in just such a way.
The drive to the milling head was from an overhead drum of the type illustrated on the page showing the bench mounted machine - whilst the indexing unit was powered through the changewheels from an auxiliary belt pulley.

The cutter-carrying worm-driven horizontal spindle could be removed and replaced by the collet-mounted high-speed grinding wheel shown to the left in the illustration above.

The Spiral Attachment, which screwed onto the headstock spindle and driven by an extension from the changewheels, was designed to work in conjunction with the Traverse Milling Attachment.