4 Jaw chuck

[Noitoen]

I was given e Belflex Spanish/Chinese lathe and it only had a 125mm 3 jaw chuck. Today I made a back plate to install an old 125mm 4 jaw I had.
The spindle nose on the lathe is a modified DIN 55027 size 3 type, being the only difference, the taper which, on my lathe, it's parallel.

Turning the the back side.

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Tapping the fixing holes.

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Had to make an extension to the tool holder due to the fact that the lead screw's protection, the tool post doesn't reach the adapter plate to true it up.

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Counter sinking the chuck mount holes.

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Ready to test.

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Finish:

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Adapter plate drawing.

Belflex.pdf

View attachment Belflex.pdf

 

[Wizard69]

Adapter plate drawing.

Belflex.pdf

Cool! I have to ask about that spindle nose, is it some sort of bolted on mounting assembly? It isn't clear what those fat studs do with respect to the spindle nose.

 

[Noitoen]

The spindle nose has 3 21mm holes with a moving plate behind. This plate has a type of key hole that slide underneath the chuck's nuts to release. Just untighten the a little, rotate the plate and remove the chuck.