It’s not really a DC question I’m asking here.
I’m adapting a working DC system to add a second bandsaw and a Performax 16×32 sander. The plumbing is 4” black drain pipe. I’ve got all the connections sorted out including increasing the Performax DC from about 2 1/2” to a four inch port. The new saw is the Rikon 18” 10-345 set up for dedicated resawing and the other saw is an old 16” grizzly with a cast iron frame set up for general use. The Rikon has two 4” dust ports, one right under the lower guides and one at the bottom of the wheel well, perfect. My problem is the Grizzly. There is a 2 ½” port in the lower wheel well and that’s it. I’m thinking of enlarging the lower port to 4” and adding a 4” port right under the lower guides. I’ve never cut into a piece of cast iron in my life. I don’t know what to expect or what cutter or technique to use. But I’m sure I can figure that out. My real question is: If I cut a 4” hole in the side of my cast iron frame, will I ruin my band saw? Make it too weak? Any problems? It’s a perfectly flat surface the distance from the edge of the circumference to the edge of the frame is about 2” on one side. Any advice?