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  1. #1
    Join Date
    Aug 2019
    Location
    Revesby - Sydney Australia
    Age
    56
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    1,185

    Default How to scribe an index line on your cross slide

    The old Hercus cross slides (or, as their parts manuals call it, the compound slide base plate?)
    have a pair of zero marks – one on the front, and one on the back – to align with the nicely engraved protractor on the rotating compound casting.

    If you use the compound at more than +30°, the front mark will be covered, and I never remember to use the back mark. Out of sight, out of mind?
    What I needed was one facing the chuck.



    1) Use a fine pen to mark the location beside 90° on the protractor:
    IMG_2306.jpg


    2) Remove compound slide assembly, and attach a tool, somewhere, to engrave over the mark.
    A scriber (or Dremel) well clamped to the bed would do,
    but I found an easier way - a boring bar in the chuck:
    IMG_2308.jpg


    3) Push the scribing tool into the casting with your left hand, and crank the carriage/saddle toward it a few times with your right:
    IMG_2309.jpg
    swinging the tool up between passes to be nice to the carbide (by turning the chuck a little).


    4) Now there is a decent groove, carefully hand scrape a few times to finish it off:
    IMG_2310.jpg


    et voila:
    IMG_2311.jpg

  2. #2
    Join Date
    Sep 2009
    Location
    Sydney
    Posts
    666

    Default

    Very clever. Was yours an old school machine? That compound casting has been well introduced to the chuck

  3. #3
    Join Date
    Aug 2019
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    Revesby - Sydney Australia
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    56
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    Default

    Quote Originally Posted by neevo View Post
    Was yours an old school machine?
    Yep. East Hills Boys High School, formerly East Hills Boys Technology High School.

    How did you guess?

  4. #4
    Join Date
    Nov 2007
    Location
    melbourne australia
    Posts
    3,228

    Default

    Quote Originally Posted by neevo View Post
    That compound casting has been well introduced to the chuck.
    It still has the blood on it.
    Chris

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