Unknown taper on collet chuck

[darkd0r]

I inherited a bunch of Erickson da180 collets and some collet chucks with no markings. There is a 1 1/2 in hex nut to hold the collet. The nut of one chuck has some markings, but they have disfigured by peening and the use of a pipe wrench to tighten and remove that nut.
All dimensions are in inches and are approximate.
minor od: 0.950
major od: 1.430
length of taper: 1.565
overall length with nut: 3.21
overall length with collet installed with nut ~ 4.75
The only threaded part is where the nut attaches. There is one keyway on the taper, and no obvious way to hold the chuck in a spindle. There are no slots to engage drive lugs.
I would like to know what taper the chuck is and if these are useful for milling, lathe or ?

Thank you

 

[aliva]

Go here and plug your numbers in

Trigonometry Calculator

 

[Illinoyance]

It has been more than 30 years since I saw one, but I believe that collet chuck fits a Moog Hydrapoint.

 

[darkd0r]

It has been more than 30 years since I saw one, but I believe that collet chuck fits a Moog Hydrapoint.

Certainly looks like a match with some listed on the internet. Thank you!
Do you know what holds the collet chuck in the spindle?

 

[Illinoyance]

The end of the drawbar expanded inside the recess in the top of the toolholder. I believe the drawbar was pulled upward by springs. Moog had an automatic tool changer, but I am not really familiar with its workings.

 

[darkd0r]

Thank you.
Oddly, the interior hole on some is ~ 0.20, while other are ~ 0.330 in.
Thank you, again.