Specs on D1-8 cam-lock connectors

[gitano]

I've found some "jacobs" collet chucks, but don't know if the D1-8 connectors are going to fit my Grizzly lathe. The G4003G lathe has a connector that is very similar to what I see as the D1-8 cam-lock connector on some of the chucks, but "close" won't do. I'm concerned the G4003G has some metric "equivalent".

Does anyone here know the CTC distance between the bolts - adjacent or opposite - on the D1-8 connector, or where I can find those specs?

Thanks,
Paul

PS - I found out that the G4003G is a D1-5 six-pin connector. I'd delete this thread, but I don't see that option available. Now I'm wondering if the D1-5 three-pin will fit three of the holes of the six-pin...

Thanks,
Paul

[zeo]

They should fit no problem if they are both the same catagory unit. The pin size, and spacing is part of the D-# sizing reguardless of manufactorer. The pins are used to hold the chuck against a very short taper on the lathe spindle nose which in of itself apart of the size spec. Reguards ZEO
The number of pins used is generally 3,4 or 6 depending on application.

[gitano]

ZEO, that's what I was thinking, but wasn't sure and couldn't find any specs.

Turns out, I got one with a mount that's not even the D-# type. I'm in the process of converting the existing mount to a D1-5 6-pin or 3-pin.

Which brings me to another question regarding "D-type" mounts. As I was considering how to accomplish the comversion I want to, it occurred to me that the biggest challenge was going to be maintaining the TIR of the original chuck. Then as I comtemplated that more, it occurred to me that there must me 'something' about the nature of the "D-type" mount that compensates for at least a little (a few thousandths or so) 'slop' in the postion and 'wobble' of the mating pins. There is certainly a frew thousandths 'slop' in the movement of the pins of the various D1-5 6-pin devices I have. Yet they all 'sung up' VERY concentric with the lathe head. So my question now is:

Is there something about nature of the "D-type" connector that 'forces' concentricity between the chuck and the lathe head when the pins of the chuck are tightened in the lathe head?

Thanks,
Paul

[zeo]

Paul there should be no slop what so ever. The pins pull the chuck on the short taper on the nose of the spindle D1-5 is 1/2"x3.0625"
The concentricty is all in this little taper so take care of it. zeo

[gitano]

Originally Posted by zeo Paul there should be no slop what so ever. The pins pull the chuck on the short taper on the nose of the spindle D1-5 is 1/2"x3.0625" The concentricty is all in this little taper so take care of it. zeo

I'll apologise in advance for my ignorance, but there's no "taper" on the two (four-jaw chuck, and 10" face-plate) D1-5 6-pin devices I have. The rear "face" of the item mates directly to the "face" of the headstock. Alignment is achieved by the 6 pins, and the accessory is then secured to the headstock by tightening 6 bolts that fit the recesses scalloped in the 6 bolts in the accessory. There's no taper that I can recognize or identify.

Where would this taper be located?

The significance of this is that there is plenty of "meat" on the Jacobs Nose Spindle Chuck back for installing the 6 (or three) pins to mate with my headstock. However, keeping TIR - relative to the center of the chuck to 0.001" or less will be extremely difficult given the machinery I have at my disposal. Since it would be only slightly less difficult for someone with access to more soihisticated machinery, I suspected that the pins, with their 'scallops', somehow centered the device.

If you can show or explain where the taper you speak of is, I will be able to "pay attention" to that when I modify the mount on the Jacobs Chuck.

Thanks,
Paul

[zeo]

Sure inside the circle that is formed by the 6 sockets that recieve the pins there should be a protursion that sticks out 0.500" and has a diameter of 3.0625. If it is not there I am not sure what you have. The pins transfere the power to the chuck and the taper keeps aligned TIR should not be more then .0005 and repeatable.

[gitano]

ZEO,

I found the taper to which you refer. It was too subtle for me to notice at first.

Thank you very much for pointing it out!

I'll have to see if I can still effect the transformation of the existing connector on the Spindle Nose Chuck to D1-5. I think I can, but I'll have to take some detailed measurements. Still, that taper, as you point out, is what 'keeps things straight'. That's good news to me, as I can make that taper.

Thanks again,
Paul

[zeo]

Paul when you do your taper make sure that it is large enought that the back of the chuck and the front of the spindle has some clearance so the that the taper is fully engaged and not bottoming out. The taper is 7*7.5" is the industrial standard. zeo

[gitano]

You betcha...

Paul