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Onsrud 1/4" Cut Diameter Two Flute Compression End Mill for Wood and Laminated Wood
Onsrud 1/4" Cut Diameter Two Flute Compression End Mill for Wood and Laminated Wood
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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
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Questions & Answers
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Based on these speeds, what should the expected cut depth be for hardwood?
A safe depth would be the diameter of the end mill. If you have CNC experience, you can also use sound as a very good indicator of the sweet range of the depth. If you hear the spindle struggling, it's probably best to either slow the feedrate, or reduce the depth. The chip size is also important to indicate if the end mill is cutting efficiently. you want to make sure the chips are not coming out as dust. There should be some meaty chips. I will typically push my end mills and use the full depth of the material if there is enough flute length to do so. If I hear the spindle struggling, reduce the depth by 10% or so. There are so many variables and I would suggest starting with the chip load calculations found on this product page.