My weekend score

[Gennady]

Kuroda boring head (jam nut and one of the stops on other side are missing, unfortunately) with MT2 shank and CAT40 adapter for that boring head. Oddly enough - screw bore on MT2 shank is 5/16 -18 while draw bar on my bridgeport is 3/8. Need to machine adapter and spacer on top to compensate adapter length.

 

[trevj]

IIRC, Kuroda was the Japanese firm that was making licensed copies of the Wohlhaupter boring heads. Very Nice! Top quality (and stupidly priced accordingly, when sold by folks that know what they have, to folks that know what they are getting!).

Given the markings, and the oddball drawbar size, what do you figure it was originally an R-8 taper spindle, that was shop-converted to MT-2? On second thought, that doesn't work out, I think. I wonder if the 5/16 drawbar thread was associated with a particular Japanese Home-Market machine tool line? Jig Bore maybe?

There are several sites around the web that can get you the book o' words 'n pictures duly associated with the Wohlhaupter UPA-2, which may be of some help to you.

Dare I ask (risking a cavalcade of "You Suck's) what you paid?

 

[Susquatch]

I put this list of drawbar threads together for myself a while back. I welcome additions and changes.

7/16"-20 UNF: This is by far the most common drawbar thread for R8 spindle's.

3/8"-16 UNC: This thread is also found on some R8 spindles, particularly on older or smaller R8 machines, including some Bridgeport M-Head machines. It's less common than 7/16"-20 for R8. Also found on some lathes with MT2/3 spindle's.

1/2"-13 UNC: This thread is typically found on drawbars for machines with NMTB #40 taper spindle's (#40 taper). It's also seen on some other larger or older machines.

M16 x 2.0 or M16 x 1.5: Found on some metric #40 taper machines, or sometimes on certain European or Asian mills that use metric standards for their drawbars. Less common in North America.

M10 x 1.5: Often found on smaller "mini-mills" or mill/drills and lathes that use an MT2 spindle.

M12 x 1.75: Commonly used on MT3 spindles on some mill/drills or smaller mills and rarely on R8 spindles of Asian origin.

M6 Sometimes found on MT1 spindles on small lathes.

 

[MrWhoopee]

I put this list of drawbar threads together for myself a while back. I welcome additions and changes.

7/16"-20 UNF: This is by far the most common drawbar thread for R8 spindle's.

3/8"-16 UNC: This thread is also found on some R8 spindles, particularly on older or smaller R8 machines, including some Bridgeport M-Head machines. It's less common than 7/16"-20 for R8. Also found on some lathes with MT2/3 spindle's.

1/2"-13 UNC: This thread is typically found on drawbars for machines with NMTB #40 taper spindle's (#40 taper). It's also seen on some other larger or older machines.

M16 x 2.0 or M16 x 1.5: Found on some metric #40 taper machines, or sometimes on certain European or Asian mills that use metric standards for their drawbars. Less common in North America.

M10 x 1.5: Often found on smaller "mini-mills" or mill/drills and lathes that use an MT2 spindle.

M12 x 1.75: Commonly used on MT3 spindles on some mill/drills or smaller mills.

M6 Sometimes found on MT1 spindles on small lathes.

M12 is also found on some R8 of asian manufacture. DAMHIKT.

 

[Susquatch]

M12 is also found on some R8 of asian manufacture. DAMHIKT.

Thanks, I'll add it above. Do you happen to know if the pitch was 1.75?

 

[Gennady]

Dare I ask (risking a cavalcade of "You Suck's) what you paid?

I paid 250 for both pieces . I wanted boring head that fits my BP and King altogether and I wanted something decent. I know - I SUCK.

Thanks, Sasquatch and MrWhoopee for outlining thread variants.

 

[trevj]

I paid 250 for both pieces . I wanted boring head that fits my BP and King altogether and I wanted something decent. I know - I SUCK.

Thanks, Sasquatch and MrWhoopee for outlining thread variants.

LOL! Most respectfully, you do! That was a great score!