The headstock on the Sherline mill can be rotated so that milling cutters can be used at an angle. However, once the spindle is pivoted, it no longer aligns with the movement of the Z-axis, and the handwheel can not be used to advance the spindle for drilling.
Parts to be angle-drilled must be mounted to the table at the proper angle, which is more difficult than mounting them flat. The rotary column attachment goes between the mill column and base to allow the entire column to be rotated to any angle up 90 degrees in either direction.
Now the Z-axis handwheel advances the spindle along its axis, allowing angle drilling to be accomplished on parts mounted square to the table. A laser engraved collar and magnifying scribe lens make it easy to set angles accurately. NO additional holes are required for retrofit (not required on 2000-series mills or multi direction vertical milling columns, as it is already included in those packages)
3500 Sherline Rotary Column Attachment Instructions
CA Prop 65 WARNING: Drilling, sawing, sanding or machining wood products can expose you to wood dust, a substance know to the State of California to cause cancer. Avoid inhaling wood dust or use dust mask or other safeguards for personal protection.
I can do all this through him who gives me strength. Philippians 4:13