Sergei Slovenija
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- Slovenija Ljubljana
I just started to study the types of fastening of a lathe chuck, for example here https://www.toolmex.com/blog/325/spindle-type-and-size-guide, based on the mentionPlease, are you aware that you have only removed the chuck from the backplate and not the backplate from the spindle?
From the large nut on the spindle, it has an American L-series spindle nose. See this post (https://www.mig-welding.co.uk/forum/threads/mystery-lathe-carriage.121977/page-2#post-2075917) for a diagram that relates the diameter of the nut to the L-number.
A choice of spindle end fittings was offered for the Ursus 52, the standard being a rather old-fashioned American Long-nose taper in an L1 size and the other an American Cam-Lock D1-6" and an American ASA A-6". On the Ursus 105, with its huge spindle bore, just one type of nose was supplied, a D1-8" Cam-Lock.
Jaws dangle in grooves. Sattrelits though shaking in their nests. This lathe chuck had a hard job. Spare jaws have not tried on yet. It needs to be taken apart and checked. Perhaps this lathe chuck is essentially a Frankenstein, and is assembled from different parts that fit approximately together.
I broke my head trying to figure out what the Slovenian sellers at the local internet flea market meant by referring to certain types of lathe chucks as "Americaner". Need to check.