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3 sided precision straight edge

P

PeterT

Ultra Member
Premium Member
I see these listed on Ebay (along with other cool stuff from the era). What was the typical use of this triangular profile in machining setups? I doubt for dovetails / scraping because the surfaces have quite a bit of relief & the corners are quite sharp.

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More rigidity than a flat ruler? The indents would facilitate clamping without compromising the top edge?

Does it have scales on it like the wooden and plastic versions do?
 
I doubt anything made to that level of accuracy would be used for scribing or layout. The other end has a hole for a handle like you see on similar metrology gage instruments like for scraping. But this only has a handle on only 1 side vs both, maybe only because this gage is shorter & lighter? These appear in tooling / metrology catalogs & generally for big bucks. But typically they look like link example. But it only has a relief on 1 surface, the other 2 are left planar presumably for blue transfer for scraping. All 3 relieved surfaces (and therefore much smaller measurement surfaces) seems to be a Russian thing? Maybe its more intended for use with gage blocks / pins / feeler gages?

www.jashmetrology.com

Straight Edge Tool | Cast Iron Straight Edge - JASH Metrology

These are used for truing, spotting and reconditioning of dovetailed guide ways of machine tools, slides, and similar workpieces.
www.jashmetrology.com www.jashmetrology.com

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