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24th Dec 2021, 07:39 AM #1Diamond Member
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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
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24th Dec 2021, 08:28 AM #2Golden Member
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- Sep 2009
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- Sydney
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Very clever. Was yours an old school machine? That compound casting has been well introduced to the chuck
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24th Dec 2021, 01:52 PM #3Diamond Member
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24th Dec 2021, 08:41 PM #4Most Valued Member
- Join Date
- Nov 2007
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- melbourne australia
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