Machining quality.

[jcdammeyer]

In the LinuxCNC group a post was made about a tool changer and some turning. He wasn't impressed with the finish. Later mentioned speeds etc were a bit off.
Video is here if you want to watch: https://photos.app.goo.gl/P5aTc83kNVYDExyV8

Couldn't resist so I grabbed a piece of rusty steel of unknown origin and used my ELS to cut a few passes with a carbide insert.
I faced it off at 586RPM.
Then turned it at 586RPM. It's about 0.84" diameter and SFM reported by the ELS was 132,
First pass 0.008" per rev and 0.010" depth of cut.
Second pass 0.003" per rev and 0.005" depth of cut.
You can just spot the carbide insert underneath the rust dust.
It's very smooth. Wouldn't take much to polish it.

http://www.autoartisans.com/Lathe/SmoothTurning.jpg

Of course I couldn't leave well enough alone...
Some 400 grit, 600 and polishing compound.

http://www.autoartisans.com/Lathe/PolishedTurning.jpg

Probably the nicest finish I've ever done. Usually never go that far. Maybe I should.
John

 

[DavidR8]

Holy smokes that's a nice finish!

 

[jcdammeyer]

Holy smokes that's a nice finish!

Funny thing is it didn't take that much work with some 220 and then 400 and 600. And the diameter didn't really change much. Maybe a thou. Was working with the caliper not micrometer. Should have checked with micrometer first and after.

 

[DavidR8]

Do you know what insert you used?

 

[jcdammeyer]

I'll look in a bit. Watching "Pretty Hard Cases" on netflix. Season 2.

 

[jcdammeyer]

OK. Pretty sure these are the inserts. CCMT060204 is on the box along with CCMT21.51
A search turns this up.

Mitsubishi Materials Web Catalogue | Products Information | Turning Inserts |

Turning Inserts| |Search from Order Number, Type of Machining, Work Material, and Cutting condition and Use Selected Tooling Sheet

www.mitsubishicarbide.net