41v50 Rifle Barrel Steel
It's been a while since I visited here. I've been setting up to do some Spiral Fluting on an incoming rifle barrel project on my Tormach 770 mill.
Setting up everything including the 4th-axis is pretty straight forward. Working on typical 4140 and stainless rifle barrels isn't really hare either but, my apprehension here has more to do with metal alloy I'll be working with in this barrel project.
I've run the numbers in my copy of HSM Advisor and I'm coming up with some feeds and speeds numbers that kind of leave me scratching my head.
I'll be using a 30 degree helical 4-flute coated carbide end mill. My flute length and stick out is one inch. It's a typical configuration ball nose end mill. My DOC is only .008" and I'm running it with the "Pocketing" box checked. The alloy that this barrel is made of is 41v50 steel. I had never heard of this type of metal till I came across it when purchasing this sample barrel. Apparently the military uses this alloy on their AR platform rifles for durability and rigidity.
My reason for posting was to ask; has anyone here ever worked with this metal alloy? Also. I've deliberately not listed the feeds and speeds I came up with because I wanted to ask those of you who may be willing to run the numbers in your version of HSM Advisor and see what you come up with. It may be that there's something I'm missing or inputting incorrectly when I enter this info in the their respective text fields.
I can tell you that any time I do any milling with my One-Horse-Power Tormach mill I have to back off of the actual speeds and feeds I'm given by at least two-thirds. With hard metals like this 41v50 I'm thinking that I will most likely have to back off even further than two-thirds.
I'll check back here later in hopes of someone being kind enough to run these numbers to see how the numbers they come up with compare to what I've came up with. Thanks in advance. If more information is needed please let me know and I'll make sure to include that with a reply.