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For high corrosion applications our choice of metals at the university was Hastelloy. Also a tough to machine metal. Toughest job I remember was drilling a .017 hole on the lathe..... -G "HASTELLOY alloy shows unsurpassed resistance to corrosion in seawater atmosphere. Exposed at Kure Beach, N...

railroad cast iron parts https://www.google.com/search?q=cast+iron+railway+parts&rlz=1C1CHBF_enCA847CA847&sxsrf=ALeKk037UMvE0kBmeCX4FvRGZWdMc0dWrw:1598501476360&source=lnms&tbm=isch&sa=X&ved=2ahUKEwi2jq-FwrrrAhVW7J4KHdcqBq8Q_AUoAXoECAwQAw&biw=1680&bih=907#imgrc=--Qf320zLvim8M

and a good one that might work if the thickness is right, is a cast iron automobile flywheel...already flat on two sides.

..............cast iron frying pans, cast iron pots, auto brake rotors, brake calipers,probably all kinds of cast iron parts lying around any railroad repair shop.

Possibly a counter bore that uses interchangeable pilots? https://www.mscdirect.com/product/details/71011746

When I was an tool and die apprentice one of the things that was taught to the machine repair trade was a thing called scraping. It was the most accurate method of achieving flatness, parallalism, and squareness and on a a machine bed. No mechanical pressure or heat from a grinding wheel, just...

Thank you for your reply Peter. I am aware of the different methods of getting this hole made, as I have done similar work on Excello mills many times. The problem is finding a place that has all the particular tooling to be able to do it. CNC would be much faster without all the necessary...

Apprenticed at GM Transmission Plant in Windsor Ontario as a Tool and Die Maker Worked as a machinist technician at the University of Calgary Science Workshop. Retired in May of 2012.

I've got a aluminium automobile intake manifold that I need a 1.250" hole bored (drilled/CNC) to accommodate a oil filler tube. Just one hole. It will require a bit of a set up because of the shape of the intake manifold and the hole is at a 25 degree angle. If anyone can refer me to a shop or...