6" Prat 4 jaw chuck

We take a look at the 4 jaw chuck and see how it works.
Making replacement chuck screw threads for the chuck
see the video link below
• 4 Jaw chuck repair part 1

[@nobbysworkshop]

Interesting video Alan. I have the slimline version of this chuck on my Myford. Crazy that a replacement screw would be so expensive. You could buy a complete used chuck for almost the same amount. Merry Christmas. Cheers Nobby

[@enotsengineering]

Hi Nobby merry Christmas to you

[@tomappleton1223]

Love Allan’s stuff.

[@grahameblankley3813]

Pratt chucks are the best make, we used them in Coventry. I watched your video on making new screws, i bought a pratt chuck from a carboot sale very cheap but i knew it needed the screws so watching your video i made 6 screws 2 spare ones, yes the hexagon was a bit tough going, i broached on the lathe, thank you very much, happy ness to you & family & merry xmas from Coventry 👍.

[@enotsengineering]

Happy Christmas to you

[@hoernst2762]

Hallo Alan, vielen Dank für diesen Beitrag. Wünsche besinnliche Weihnachtstage. Holger aus Cologne Deutschland.

[@enotsengineering]

Merry Christmas to you

[@CraigLYoung]

Thanks for sharing 👍 and Merry Christmas to you and your family 😊

[@enotsengineering]

Same to you!

[@misterferien]

I own a 5" Pratt independend lathe chuck no. 54. Two or three years ago one square cap broke. There are no more spare parts for this model available. Unfortunately I can't cut a suitable thread with my metric Norton box. In the meantime, I bought a Chinese independent lathe chuck, but it is of poor quality. I can only centre a workpiece directly at the jaws, towards the tailstock it deviates considerably. In another video I saw how you made such a screw. Now I am looking for someone who might be able to make me such a part. Greetings from Germany

[@enotsengineering]

Can any one in Germany help?

[@misterferien]

@@enotsengineering I hope so...

[@melgross]

Why would a manufacturer number a jaw on a non centering chuck? There’s no point to that. Also, why would you say that the hex cap screws for the backplate are the same as the square holes in the jaw screws?

[@enotsengineering]

Hi the chuck screws. Have a hexagon on them merry Christmas

[@melgross]

@ ok. It’s funny then that you showed a square chuck wrench. Happy holidays to you too.

[@garytaverner5930]

Could be that they are chosen for their fit on the slide.