I have a 6 1/4" Rhom 3 jaw chuck with 3 socket head cap screws, and a diagram above them. I'm assuming that this is an adjustable 3 jaw? I am having difficulty finding information on it, my Google fu is lacking today.
If it's a website you want to look at, try this one ROHM lathe chucks.
I'm not sure what the X marking is about, could it be an indication that the chuck is threaded, and
must be used for lathe-in-forward machining? They do make some non-scroll 3-jaw chucks, but adjust
screws so close to the axis is ... surprising.
Those three screws are to hold the back center section of the chuck on. If we’re a adjust type it would have a 1” ish counterbore in the rear of chuck and screws usually six around the outer part of diameter to lock chuck down to backplate once centered. There would also be 4 Allen’s 90* apart to adjust in the chuck. Could we get a picture of the back?
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