Chuck mount for old Portomag

[RichTes]

Picked up and it runs smoothly. Unscrewed and looks like a sleeve for a MT3 or 4 drill.

What does the mount look like for a Jacob’s chuck? Is it the same as the outside of the sleeve with a JT on the end?

This thing is heavy.

Thanks!

 

[RichTes]

Or did it just use a chuck with a MT mount?

 

[Beerhippie]

Or did it just use a chuck with a MT mount?

I've seen MT2 to JT3 spindles.

 

[RTM]

This is a 1951 brochure from a competitor Lupear (another thread here on that), but they show multiple sizes , and options within the sizes in some cases. Might help you make an informed guess.