Early on in planning the design for the Quadrotor, we knew that eventually some of the metal parts would need to be milled. Having very little milling experience, other than a couple of basic-use classes at TechShop, I had no milling experience. When it came time to start buying router bits for the ShopBot and Tormach CNC routers, I didn’t know what kind of bits were necessary.
Understanding End Mills
In his Article, Greg mentions some bits he recommends. From my experience so far here are the 3 Carbide mills I bought, which are sold through Amazon (direct links):
- 1/2″ End Mill 2-Flute. – This is really good for hogging out massive amounts of material or quickly cutting profile (cut outs).
- 1/4″ End Mill 2-Flute. This is the workhorse bit I have been using for my projects, which have a relative amount of detail.
- 1/8″ or 1/4″ Ball Nose End Mill 4-Flute. – If you want a nice finished edge or smoother 3d milling features, a ball nose is necessary. I have both a 1/8″ and 1/4″ ball nose, but have found it is pretty easy to snap a 1/8″ while its results aren’t significantly better than the 1/4″.
Also, for the smaller bits, you should probably go ahead and buy two. You are going to break a bit. When it happens, review your feeds and speeds then try again.