Drill chuck won’t stay on arbor

[Janderso]

Old school trick that I have used with great results in the past. This does assume that the tapers match well. Take a piece of chalk and draw about 6 to 8 lines along the length of the taper ( clean and de-grease first), clean the chuck, twist them together and drive the arbor home.
I have had difficulty separating arbors and chucks assembled in this manor.
Richard

So the gypsum/calcium carbonate/limestone, creates a binding fit?
I'm not questioning you, it's just interesting that it would last.

Benmychree? Have you heard of this one?

 

[vincent52100]

Thanks for all the information!