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John Thomas tossed a pretty simple question into the MACHINIST group:
“A metal you hate to work with? Me cast iron!!”
That was apparently all it took.
37.3K reach. More than 1,000 comments. And enough material slander to fill a scrap hopper.
After scrolling through the replies, a few names kept coming back: cast iron, stainless, Inconel, Hastelloy, Stellite, Monel, titanium, tantalum... and basically anything that destroys tooling, work-hardens at the worst possible moment, or leaves you filthy by lunch.
Cast iron: cuts nice. Everything else sucks.
John’s pick was cast iron.
And quite a few machinists were right there with him.
Holden James summed it up pretty well:
“Definitely cast iron... it cuts easy but I hate how it smells.”
Another machinist said deburring it left his “nose and hands black like a coal miner.”
That seemed to be the recurring complaint.
Not necessarily hard to machine.
Just dirty as hell.
The dust. The smell. The sludge. The cleanup. The black boogers.
Paul Caygill called cast iron “a breeze to machine but dirty.”
But naturally, there were defenders too.
John W. Bauer Sr. said:
“I love cast iron.”
He then casually mentioned running a 120" x 50' G&L planer in the 1960s.
Fair enough. I’m not arguing with that guy.
Then Inconel entered the chat...
If cast iron got roasted for being filthy, Inconel got roasted for being Inconel.
X750.
There seemed to be a grade available for every machinist’s personal trauma.
And the replies quickly turned into a game of one-upmanship.
“Inconel 625 is terrible.”
“Try X750.”
“Try Stellite.”
“Try Rene 41.”
There is apparently always a worse material waiting somewhere. 😂
Rich Crook eventually grouped Hastelloy, Inconel, Monel and titanium into what he called:
“the ‘nomachinium’ class of metals!”
Hard to improve on that.
Stellite got its own share of abuse too. One shop owner apparently once said:
“Anyone who knows anything about stellite, doesnt work with it.”
Naturally, a Stellite job showed up a week later.
One machinist’s nightmare is another machinist’s Tuesday
This was probably my favorite part of the whole thread.
For almost every material somebody absolutely hated, another machinist jumped in to say:
What’s the problem?
Guys complained about 304.
Other guys said 304 was easy.
Guys hated Inconel.
Other guys said they ran it every day.
Jordan Kennedy had apparently gotten comfortable machining A286 and multiple grades of Inconel... but 303 stainless was the one that got him:
“303 is just so fucking stringy it makes my skin crawl.”
And one commenter probably gave the boring-but-correct answer to the entire discussion:
“All metals are fine as long as you have the right cutters for the job.”
Sure.
But that’s not nearly as fun.
A few other answers that made me laugh
James Jesus: “Wood. Fuckin awful stuff.”
Lucas Matthew: “Hair metal is the absolute worst.”
Ronald Garland: “All of it. That's why I retired 4 years ago.”
Adrian Robert Plant, now retired, skipped machining altogether and started listing Black Sabbath, Deep Purple, Motörhead, Judas Priest and Pantera as the metal he still enjoys. Then finished with: “All the other metal I now hate, I fecking love retirement.” 😂
So what's the worst material?
Apparently:
All of them.
Too hard. Too soft. Too gummy. Too stringy. Too abrasive. Eats inserts. Won’t finish. Work-hardens. Smells like shit. Makes a mess.
Or it machines beautifully and still leaves you looking like you just finished a shift in a coal mine.
And for every machinist who hates it, there’s another one waiting in the comments to tell you it “cuts like butter.”
Wouldn’t have it any other way.
What material do you see on the traveler and immediately think: Ah shit... here we go again?
