Question- boring bar tool holder design BXA-

V-100 · May 30, 2017

Greetings,
I recently put a Aloris BX tool post on my SB 13. I am looking at a boring bar holders (3/4", leaning towards an import).

How does the clamp illustrated below work. Looks like the clamp screws are off to the side. Is there a wedge in the system. Looks like a thread masher

Is the Aloris (or import which I have yet to find) slot type (ex- BXA-4D or perhaps the -100) a better way to clamp than the mystery system seen below?

Thank you. Jim

iwananew10K · May 30, 2017

Works basically like the quill lock on your tailstock.

FWIW I always just used the slotted holders with the v groove.

Cheapie version-
BXA #2XL OVERSIZE (3/4") QUICK CHANGE TURNING FACING BORING TOOL POST HOLDER | eBay

V-100 · May 30, 2017

Thanks for that and the link.

Here is a pic. Old school lathe, like what I used 42y ago. Some serious compound rest scars. Kids must set the feed then gone to lunch... maybe more than a few times.

TDegenhart · May 30, 2017

Check Shars.com. I have most of my tool holders from them. They work just as well as the Aloris and Dorian holders at about half the price.

Tom

CarbideBob · May 30, 2017

V-100 said:
How does the clamp illustrated below work. Looks like the clamp screws are off to the side. Is there a wedge in the system. Looks like a thread masher

The screws up top pull up wedges from below.
Added difference from your tail-stock or a quill lock is the collapsing sleeve inside so you don't scar the body.
Much stiffer and better damping than a top screw model and allows you to orient the bar any which way you like radially effectively changing the cutting geometry.
Bob

V-100 · May 31, 2017

Good info. Thanks Bob.

GenePoole · May 31, 2017

TDegenhart said:
Check Shars.com. I have most of my tool holders from them. They work just as well as the Aloris and Dorian holders at about half the price.

Tom

Caveat: The allen screws suck. Get a box of good screws from McMaster Carr. Then they are close to as good as Aloris or Dorian.

V-100 · Jun 1, 2017

Roger that. Thanks Tom.

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