Stupendous Man wrote:
Can you ID these lathe tools? I found them in a large box of various
lathe cutting tools.

These are some of a dozen or so, ground from rod stock and honed. I have
no idea what they were made for. They are ground to the centerline and
have no relief angle.
http://i221.photobucket.com/albums/d...e/IMG_0877.jpg

Taper reamers. Home made. The model locomotive builders use similar
for making working model injectors for topping up their boilers. Cheap
and easy to make, without having to use any high tech measuring tools,
as you start with a diameter, and a distance, then grind or machine away
half, harden, then stone the face.

This one has some pretty serious angles on it and has a very thick
carbide. I can't figure out what carbide-worthy material needs so much
relief.
http://i221.photobucket.com/albums/d...e/IMG_0884.jpg
http://i221.photobucket.com/albums/d...e/IMG_0883.jpg

Carbide isn't just for hard materials. It is also used for abrasive
materials (some plastics, some woods, fiberglass, etc.) as well as to
enable the use of the higher cutting speeds allowed by the carbide.

This one has a cutting edge about 5 inches long, again no idea what you
would cut with it. It really is a blade more than a single-point, and
agin, zero relief.
http://i221.photobucket.com/albums/d...e/IMG_0881.jpg
http://i221.photobucket.com/albums/d...e/IMG_0883.jpg
http://i221.photobucket.com/albums/d...e/IMG_0880.jpg


I've seen similar as blanks for boring tools, as well as as single
edged engraving cutters.
The engraving cutters were usually round shanked, but they had the
profile ground to a half round shape for most of their length. The were
sharpened by taking a single compound angle grind across the end.

If the grind goes full half round, or just quarter round, they may be
pre-ground blanks for boring or internal threading tools.
With a square shank on them, that's what I'd bet.

I've lost money betting, before, though.

Cheers
Trev