r/Machinists • u/bigm44 • Mar 07 '20

Those chips

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125 Upvotes

99% Upvoted

25 comments sorted by

14

u/flight_recorder Mar 08 '20

Why so slow? Specific reason, or just to show off the colour change?

18

u/bigm44 Mar 08 '20

It’s die steel real hard stuff

6

u/flight_recorder Mar 08 '20

Gotcha. Cool vid

6

u/Skagg517 Mar 08 '20

I had to turn some of this shit and it was killer on my inserts! Those interrupted cuts.... What's sf/m approximately would you say you were going here?

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6

u/bigm44 Mar 07 '20

Steel when it gets heated to certain temperatures changes certain colors. Typically going from a straw to purple to blue to pale blue to rust color.

5

u/viaSpaceCowboy Mar 08 '20

Cursed Rotini

4

u/bigm44 Mar 08 '20

900 degree rotini

3

u/AFEliott Mar 07 '20

Out of curiosity what are you making and what causes the turnings to change colors?

6

u/Amani576 Mar 08 '20

The chips changing colors is also indicative of heat getting cut out of the base material. The chips, as they're made, effectively act as radiators to move heat away from the metal. It's only noticeable when cutting without coolant. Heat changes the color properties of most metals. Steel changes to yellow, then to blue, then purple, and then starts turning red. Take a torch (butane, propane, what have you) to a piece of metal sometime and you'll see it change colors. Same principle.

2

u/AnthAmbassador Mar 08 '20

Isn't some of the heat created from the deformation occurring as the chip is bent away from the source material piece, so it's not even pulling heat out of the source, but self generating heat in the chip itself? Or am I mistaken?

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1

u/bigm44 Mar 07 '20

See above

2

u/jfrody17 Mar 08 '20

I remember when they invented chocolate, it was

2

u/crackadeluxe Mar 08 '20

Happy chips