JACOBS PortoMatic Keyless Chucks, any good? Anyone have any experience with them?

[mr_macgee]

JACOBS PortoMatic Keyless Chucks, are they any good? Anyone have any real experience with them?

I'm a die hard Albrecht user but a friend of mine gave me a Jacobs Portomatic 1/2" 500 chuck that he never used, before I buy a shank for it and start using it on projects I was wondering if anyone has had experience with these? They look old school and heavy, there is almost no info about them on the internet. There Jacobs so I would like think there good? runout and holding strength.

Thanks


Pic is not my chuck

 

[mr_macgee]

Nobody has had experience with these?

 

[Don's Engine]

Wow old post. Just stumbled on it. I have the smaller version 1/4" and it holds bits dead true and tight tight tight. Those older Jacobs chucks were really amazing and the Portomatic is no exception. Don

 

[brio50]

You can read about Jacobs Portomatic Keyless Chucks in Volume 67, Issue 26 of American Machinist, Shop Equipment News, Pages 1030-1031 : https://books.google.com/books?id=u...30#v=onepage&q=jacobs portomatic good&f=false .

This was written in 1927! Also, these appear not to be intended for lathes, they were used on portable drills per the description.

I am curious what runout could get down to after restoration and if they would be suitable for a lathe tailstock. I have no doubt they were well made.