yaldaboath
Plastic
- Joined
- Dec 2, 2021
In the middle of a very complicated part run, with lots of fun, small features; e.g. drilling 0.0315" diameter holes in 304 Stainless Steel to a depth of over 0.18".
These parts also were my first venture into 304 Stainless Steel after doing a fair amount of milling and turning of 303 Stainless Steel. This was a bit of a shock, to say the least.
The first series of parts have been made out of hot rolled 304. The hardness from the mill is 178 Brinell and had a very rough mill scale. I broke a couple hundred dollars in drills and endmills using the manufacturer's recommended speeds and feeds. After dialing back the speeds and feeds and adjusting a lot of the machining toolpaths, I was able to get a consistent process.
I am now running a different set of parts in the series and the material is cold drawn 304, with a mill hardness of 216 Brinell. I started with a lot of the speeds and feeds that I developed for the hot rolled 304, but based on the sounds of the machining, I have been able to push the speeds and feeds back up to the manufacturer's recommended speeds and feeds.
The harder material seems to cut better, but also has a lower chromium content 18.13% versus 18.33%.
I know this is a bit subjective, but has anyone had a similar experience with hot rolled and cold drawn stainless steel?
These parts also were my first venture into 304 Stainless Steel after doing a fair amount of milling and turning of 303 Stainless Steel. This was a bit of a shock, to say the least.
The first series of parts have been made out of hot rolled 304. The hardness from the mill is 178 Brinell and had a very rough mill scale. I broke a couple hundred dollars in drills and endmills using the manufacturer's recommended speeds and feeds. After dialing back the speeds and feeds and adjusting a lot of the machining toolpaths, I was able to get a consistent process.
I am now running a different set of parts in the series and the material is cold drawn 304, with a mill hardness of 216 Brinell. I started with a lot of the speeds and feeds that I developed for the hot rolled 304, but based on the sounds of the machining, I have been able to push the speeds and feeds back up to the manufacturer's recommended speeds and feeds.
The harder material seems to cut better, but also has a lower chromium content 18.13% versus 18.33%.
I know this is a bit subjective, but has anyone had a similar experience with hot rolled and cold drawn stainless steel?