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Onsrud 1/4
Onsrud 1/4
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Onsrud 1/4" diameter 7/8" cut length end mill
Onsrud 1/4" diameter 1" cut length end mill (Extended Shank Length) Overall Length: 4"

Onsrud 1/4" Solid Carbide Two Flute UpCut Ballnose End Mill for Plastics, Solid Surface, Aluminum, and Wood. Shank: 1/4", Cut Diameter: 1/4" Part #: 52-200B


This end mill will cut a U-shaped groove in wood, plastic or aluminum at 1/4" wide. The material is solid carbide.

Cut Diameter - 1/4 inch or 6.35mm
Shank diameter - 1/4 inch or 6.35mm

Soft Wood, Soft Plywood, Laminate Chipboard and Laminated Plywood:
Chip load: .015 to .017
Suggested Low End Feed Rate: 540 IPM
Suggested High End Feed Rate: 612 IPM

Hard Wood and Hard Plywood:
Chip Load: .012 to .015
Suggested Low End Feed Rate: 508 IPM
Suggested High End Feed Rate: 580 IPM

MDF (Medium Density Fiberboard):
Chip Load: .013 to .015
Suggested Low End Feed Rate: 468 IPM
Suggested High End Feed Rate: 540 IPM

All Feed Rates are based on 18,000 Spindle RPM

Related Tutorials
greenBull cutting aluminum Cutting Aluminum Fail Using a Cheap End Mill
In this video we’re cutting an aluminum ring from a solid block of 6061 aluminum. The client gave us specifications that the ring needs to be 1 and a half inches in length, about 4 inches for the outside diameter, and about 1/4 inch for the wall thickness.
greenBull cutting aluminum graphic poster Cutting Aluminum with the greenBull CNC and Onsrud End Mill
In this video, we are showing 2 examples of cutting aluminum. The first example will be dry cutting which is cutting in the absence of a coolant or cutting fluid.
Some Information about End Mills (Rotational Cutters) for CNC Machines
I receive a healthy dose of questions about end mills and which ones that I use. I usually respond with answers like, my end mill will probably differ from your end mill. So, what is this thing called an end mill anyhow? If you are new to CNC machining and routing, you may have never heard of the thing. I could imagine googling something like, "CNC bits". Using the terminology "bit" is not all that incorrect. Bits are commonly referred to as drill bits, but routers use router bits. If you're looking to cut various metals and composites, end mills are the tools of choice. However, end mills will also work on wood, depending on the type of end mill selected.