Machinability Charts (and a challenge)

[ChazzC]

While I mostly work in 6061, 12L14/15, 1018, 1144, 4130 and Acetal, every once in a while something comes up with a different recommended material. In order to make an informed decision between the alternatives I'll do a little research which includes looking at machinability. To assist with this, I use a couple of different charts:

My go to's are Carbide Depot's chart that has mostly steel & alloys; and this one, from Yankee Reamer, which includes other materials. Yankee also has excellent guides for selecting reamer and holes sizes. Of course, the two charts aren't based on the same scale, but the relative data is similar.

I hadn't paid much attention to some of the materials listed in the Yankee chart until earlier today when one item caught my eye, and then another one: it turns out the folks at Yankee have a sense of humor. See if you can spot the outliers in the Yankee Machinability Chart.

 

[DavidR8]

I think they wanted an evenly populated chart

 

[durableoreo]

let me check the dryer...

 

[Jim F]

Try finding a RYERSON book.

 

[Jake M]

Those might be valid. If you're gonna build a giant fish tank, you're probably gonna need some chinking in the corners....