Is it ok to mount a 4 inch chuck on a MT3 Morse taper?

[Joez71]

OK... Yes, you just need an intermediate disk. If you're not planning to take it on and off frequently, an aluminum disk will do just fine. Here's a sketch of what you need. Notice 4 holes are counter-sunk so the heads of the bolts are below the surface of adapter plate. Three of the holes will need to be threaded. You may need to purchase new bolts of the proper length.

View attachment 266725

Ray

Thanks Ray, thats makes sense

 

[Ray C]

Oops... Oh yes, you may wish to drill a hole in the plate so you can access the spindle bore. Minor oversight... There's also a shoulder on your existing backplate. If you know anyone with a larger lathe, perhaps they can make a corresponding feature in your intermediate plate. Since you won't be doing very heavy machining, you can get-by without it.

Ray

 

[Joez71]

Yes, I'll add the bore and shoulders I bought thicker stock to allow me to do it. Its my first reall project might as well do it all