Hi, I have been using my Orac for some time now and would really like to have an auto chuck for bar feeding. I recently aquired a Burnerd collet chuck which takes the EC collet range. These are usually fitted to Colchester lathes and the outer diameter is about 5 inches and the length about 4", Fitting it to the Orac is not an issue but will I encounter other problems like the motor not capable of driving it or the force of closing the collet lever putting strain on the headstock/lathebed mountings or other issues.


Your advice greatly appreciated.




Cheers

John

Hi John,

in general collet chucks take less power than 3/4 jaw chucks, they run smoother and quieter,  they also need less clamping force than a 3/4 jaw chuck due to the amount of surface area covered by the collet.

Graham.

Thanks for your quick reply Graham, I was more concerned about the extra weight of the chuck compared to the 4" 3 jaw chuck the Orac has. Also the extra length of the collet chuck will be 1.5" more once I fit a backplate than the Orac chuck and I was concerned if there would be any extra load on the spindle bearings or would that not make much of a difference to worry about.


Cheers
John

As long as everything runs true I see no problem.

Graham.

Hi Graham, Ok Thanks for your advice.



Cheers
John