D1-6 without two cams??

GregSY · Jan 26, 2020

I bought a Pratt Burnerd 12" 4 jaw chuck advertised as D1-6 mount.

I didn't look at the photos super-closely.

On arrival, I noticed that the D1-6 is missing two of the studs. There is a hole machined for them, but it is not counterbored or tapped, etc.

Is this normal? Or did I buy something I will need to finish machining...?

With studs removed:

Ianagos · Jan 26, 2020

Looks fine to me. Probably they couldn’t put the studs into there because of the other holes. But should run fine. Only thing is I have heard of the locking cams on lathes break off at higher rpms.

LKeithR · Jan 26, 2020

It should be fine. A D1-6 mount is massively strong and probably overkill with all six studs in place
and working. I've got a 13" lathe with a D1-6 mount and an 8" 3-jaw and a 10" 4-jaw. Even on the
4-jaw chuck six studs seems like a lot. We had a Graziano SAG 14 which came with a D1-5 mount and
the 8" 3-jaw and the 10" 4-jaw chucks which came with it only had three studs installed. We ran that
machine for more than 10 years and I never once felt uneasy about the mount...

johnoder · Jan 26, 2020

Dual purpose D and A? I expect you will find the four holes without pins go all the way thru chuck body - so it could be bolted to A1-6" spindle nose - assuming removal of pins.

thermite · Jan 26, 2020

johnoder said:
Dual purpose D and A? I expect you will find the four holes without pins go all the way thru chuck body - so it could be bolted to A1-6" spindle nose

Could be you are correct on the use, but that they do NOT go through.

Suspect the back side of the untapped holes is counterbored. The plate is bolted from the front, already, and into blind holes at that.

Separate the chuck from the plate, bolt the naked plate to A-series, re-attach the chuck to the now-mounted plate with the same bolts it uses for D1?

Scheming something similar to get D1-4 goods onto Cazeneuve-proprietary by putting from-the-back fasteners into empty but threaded D1-stud sockets.

Caze is, itself, "dual use."

Taper, rim-pinch screws on the "radial", XOR (one or the other, never both at once) face mount similar to A-series.

GregSY · Jan 26, 2020

Yes, it was advertised as D1 or A1. But, in hindsight, I don't see why they didn't finish the two holes....I don't see that it would in any way prevent the A1 mount.

Oh well....

eKretz · Jan 27, 2020

Like already covered, don't even worry about it. (4) ⅞" pins will be plenty as long as you're not running 80 horsepower and trying for the impossible world record cut. Even then you'd just blow the tool shank or shear a feed drive pin before all 4 of those would let go.

Garwood · Jan 27, 2020

I have an 80 HP lathe and the 16" chuck is held on with 3 24MM bolts. It has been crashed hard enough to blow the 2000 lb turret through the door twice. Those 3 bolts have never been replaced AFAIK.

GregSY · Jan 27, 2020

OK thanks all. I'm gonna clean this chuck up and use it for...the rest of my life. This chuck was sitting new on a shelf, never used, got surface rust over the years.

James H Clark · Jan 27, 2020

Gregsy: I have a 15" South Bend Nordick that I bought used, that came with a 12" 3 jaw D1-6. It has 3 pins. Used it 20 some years and works great.

JH

GregSY · Jan 27, 2020

The surprises continue....the chuck is a Kitagawa, not P&B. Should I complain...?

eKretz · Jan 27, 2020

Ummm...no?

sfriedberg · Jan 28, 2020

GregSY said:
The surprises continue....the chuck is a Kitagawa, not P&B. Should I complain...?

In your shoes, I would be more chortling darkly and scrubbing my hands together in best bandit fashion.

GregSY · Jan 28, 2020

OK thanks...I thought PB was near the top of the heap but maybe not...

sfriedberg · Jan 28, 2020

P&B makes a fine chuck, but so does Kitagawa.

Lakeside53 · Jan 28, 2020

I have a 10 inch nice Swedish 3 jaw. D1-6 with only 3 pins direct mount into the chuck body. On the other hand I have a 6.25 Bison on a D1-6 backing plate - all 7 pins. lol.

AlfaGTA · Jan 29, 2020

Lakeside53 said:
On the other hand I have a 6.25 Bison on a D1-6 backing plate - all 7 pins. lol.

7 pins??????????????????????????????????????
Cheers Ross

Lakeside53 · Jan 30, 2020

damn phone keyboard! At least someone reads my posts

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D1-6 without two cams??

Diamond

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Diamond; Mod Squad

Diamond

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Diamond

Diamond; Mod Squad

Diamond

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