Hi All, I had a job come into work that I'm knocking back as my lathe (AL-960B) and Mill (BM-20E) don't have the capacity to do it. The job was to increase the bore of a 280mm-OD stainless steel pipe backing flange from 170mm-ID to 180mm-ID. The flange is 17.5mm thick and the water board dropped one in for me to look at and there is something like 12 that need doing. The OD is to big for my lathe chucks and although it would fit on the faceplate the holes in the faceplate don't suit. I have a boring and facing head for the mill which is supposed to have a capacity of 5mm to 250mm but looking at this Brochure https://www.engineeringx.pitt.edu/up...20machines.pdf it says the Boring range in mild steel is 6" (152mm). I only have brazed carbide boring bars at the moment for my boring & facing head (I ordered a set of carbide insert boring bars for it this morning.
Sorry I'm being a bit long winded I know. My question is the 152mm boring range the actual capacity of the mill, because if you extended further than that it's going to be too much imbalance on the mill and likely to cause vibration and therefore chatter as well ?.


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