Adaptor for workpiece fixture

An adaptor for securing an elongated workpiece in a workpiece fixture so that the workpiece is adjustably positionable with respect to the fixture comprising:

• (a) holding means for holding said workpiece in a fixed orientation with respect thereto wherein it projects outwardly from said holding means, said holding means comprising a first carriage and workpiece clamp means for securing said workpiece on said first carriage;
• and
• (b) means for securing said holding means in said fixture comprising a shaft which extends in substantially the opposite direction from said workpiece in substantially parallel relation thereto, said shaft being receivable in said fixture for attaching said securing means thereto, a first adjustment assembly operative for adjusting the position of said holding means in a first direction which is substantially perpendicular to the extent of said shaft and a second adjustment assembly attached to said first adjustment assembly and operative for adjusting the position of said holding means in a second direction which is substantially perpendicular to both said first direction and said shaft, said first adjustment assembly comprising a mounting block which is attached to said second adjustment assembly, said shaft extending from said second adjustment assembly in substantially the opposite direction from said mounting block and in substantially parallel relation thereto, said mounting block and said first carriage being received in interfitting relation and being slidable with respect to each other along said first direction, and first carriage clamp means for adjustably securing said mounting block and said first carriage in interfitting relation, said first carriage clamp means including screw means engageable with one of said mounting block or said first carriage for adjustably securing said first carriage in various laterally adjusted positions with respect to said mounting block.