With integral dust and chip collection. To machine curved and circular workpieces economically, accurately and with maximum regard for safety. This safety and working unit enables fast and low risk milling of curved workpieces. The power feed unit can also be used with this device. The BowmouldMaster can be easily and quickly fitted to the table of spindle miller without the use of tools. A template is provided for the initial drilling and tapping the machine table. Adjustment for guide plate height and position is both quick and accurate. It is possible to use the BowmouldMaster for both clockwise and counter-clockwise machining.