collet holder

[pacojohnson]

I am building a small rotary axis for use in a wire edm and I plan to use 2J collets as that is what we have in the shop. I've tried everywhere, but I can't find dimensions to use for building the chuck. I can find the main bore size, but I can't find the angle used on the collet, as well as the length of angle used in the chuck compared to length of angle on the collet. I would assume the length of angle on the chuck would be shortet than the collet, but was just wondering if anyone knew these dimensions. Thanks in advance.

[jalessi]

7-degree closing angle (14 degree included angle)