News | Published:

Jig Borer Microscope

    Naturevolume 149page497 (1942) | Download Citation



    THE recent introduction of the “Watts” jig borer microscope provides a valuable optical accessory for use with high-precision machine tools such as jig borers, and tool-room milling machines, Its purpose is to enable the axis of the machine to be accurately located in relation to a datum mark on the work-piece. In construction, it consists of a high-power microscope the optical path of which is bent so that the user can conveniently inspect the work from one side when the instrument is set up in the spindle of the machine. The microscope is mounted on a taper shank-No. 4 morse taper is used in the standard model but any of the usual tapers can be supplied- and the shank is inserted in the spindle. In this position the objective axis of the microscope coincides with that of the boring spindle, which the operator is thus enabled to bring within an accuracy of 0 -00005 in. to the desired position.

    Access optionsAccess options

    Rent or Buy article

    Get time limited or full article access on ReadCube.


    All prices are NET prices.

    About this article

    Publication history

    Issue Date



    By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.

    Newsletter Get the most important science stories of the day, free in your inbox. Sign up for Nature Briefing