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(60-113MW) Onsrud Compression End Mill - Cut Length - 7/8 inch or 22.225mm

A combination upcut and downcut end mill cutter for best quality on the top and bottom edges of the material being cut. Very High Quality End Mill from Onsrud Will create a flat bottom surface


This is a tool from Onsrud that exhibits upcut and downcut flutes in the same cutting area of the tool. The upcut portion is on the end of the end mill, and the downcut portion is on the upper portion of the end mill. So, why would a cutting bit need this geometry of flutes? The upcut end mills leave a poor edge quality on the top of the work piece and conversely, the downcut end mills leave a poor edge quality on the bottom of the edge work piece. The reason for this is that the cutting action, either up or down, will respectively pull up the edges, or push down the edges. It's like pealing the skin off of the edge. If you have the cutting action in the opposite direction of the face of the edge (i.e. downcutting on the top edge), the skin of the wood is forced into the inner portion of the wood rather than the skin peeled up.

Cut Diameter - 1/4 inch or 6.35mm
Shank diameter - 1/4 inch or 6.35mm
Excellent Quality on Top and Bottom Edges of Cut

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: .014 to .016
Suggested Low End Feed Rate: 504 IPM
Suggested High End Feed Rate: 576 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 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.
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.