I’m going to be careful here about making a positive I.D. on your machine. It appears to be a regular 45-inch El-Jay fine head, although the description needs further clarification.

If so -- a lot is being asked of this model and size, to reduce up to 5 and 6-inch pieces. Even if using a generous +1.000-inch discharge setting, anything beyond 4 inches with an extra coarse liner set is as much as it’s going to do efficiently. The top diameter and resultant effective circumference is too small to deal with much of that size material beyond the very open feed side.

IFORs rarely apply to fine head 3rd stage type crushers, due to the limited bowl frame room between the back of the b-liner and the inner fit side of the bowl frame. Any applications of IFORs in these 3rd stage crushers amounts to going from very fine to medium crushing parameters (i.e., 2 x 1-inches to 3 x 2-inches).

That is not what’s being described here. If this is a 45-inch El-Jay fine head, the best set we could offer you would be something like a 312482 and 312475 (Columbia sketch # 1392), and only for the correct bowl frame.

The original equipment manufacturer bowl frame part number is going to have to be identified before going any further. This is necessary because of the “short and long” b-frames that are available in this size and model of machine. For further discussion of the application of IFORs and their place in the universe, contact me directly at chuck_h@columbiasteel.com, or our customer service department at 1-800-547-9471, ext. 257.