Chuck Weight on 10EE

Toolmaker51 said:
Every chuck has a maximum RPM; diameter is not initial critical factor. Advertisement specifications give speed ranges, and the material; there are cast iron chucks, semi-steel, and forged bodies. There isn't anything intrinsically wrong with chucks, most large lathes have them; along with suitable speed range.
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One failure is a loose scroll or empty chuck; when a high RPM fast start turns the body, yet inertia stalls the scroll, potentially ejecting the jaws.
Another mounts a cast chuck (few are fully balanced) on a high speed spindle. Never witnessed a failure, have seen the evidence. Cracks occurred in the jaw slideways; where there is the least material.
Early lathes didn't reverse; the spindle/ chuck connection were just male/ female threads. A 'crash' could over tighten that making disassembly a big problem. Without a decent spindle hole size, demonstrates compensation with extraordinarily (comparatively) long beds.
It's not my spindle choice, but the long taper-drive key-retaining nut was probably first correction for that. It's positive retention, yes. If buying such a lathe, examine the cuts in the nut, and for hammer marks on the spanner. Tells you more about the operators than the seller ever will.
The D-mount wrench, the handles and square straight or twisted?
A-mount, look at the socket head screws retaining the chuck (closest to spindle hole); everyone recognizes an abused hex drive opening.
 
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Square Dial 10EE swings about 12.5" . . . One of many advantages I see in D-1 mounts, simplified back plates.
 
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