My B&S uses a knob equipped shot pin. Out the spindle is "live". in it is "dead", but of course the dog driver rotates so you can grind work between a set of "dead" centers. Typical of UNIVERSAL cylindrical grinders.
"live" for when you want to use the spindle mounted grinding chuck
That's correct. I had one like that (12 x 26), but older. There should be a 5/16 setscrew in the hole shown. When engaged the inner and outer turn as one. When you take the screw out a pin should follow. I always rotated the head so the hole was down. The pin would fall out. Now the center is stationary to where you can install your center. On the rotating outer are tapped holes to hold you dogs. If you don't have a center and it's not a Morse taper then it's probably a Brown & Sharpe #7. This is from memory and also an older machine. Good luck.
This website or its third-party tools process personal data (e.g. browsing data or IP addresses) and use cookies or other identifiers, which are necessary for its functioning and required to achieve the purposes illustrated in the cookie policy. To learn more, please refer to the cookie policy. In case of sale of your personal information, you may opt out by sending us an email via our Contact Us page. To find out more about the categories of personal information collected and the purposes for which such information will be used, please refer to our privacy policy. You accept the use of cookies or other identifiers by closing or dismissing this notice, by scrolling this page, by clicking a link or button or by continuing to browse otherwise.