Product category:
Milling cutters
News Release from: Sano Tools incorporating P and M Regrinds | Subject: Hi-Helix End Mills
Edited by the Manufacturingtalk Editorial
Team on 03 July 2006
End mills satisfy higher speed CNC
machining
With CNC machines being able to run at greater speeds and feeds, it is necessary to utilize cutting tools, such as carbide end mills, that are able to run at increased operating parameters.
In this age of advanced technology, with CNC machines being able to run at greater speeds and feeds, it is necessary to utilize cutting tools that are able to run at increased operating parameters P and M Regrinds Hi-Helix End Mills are ideally suited to CNC milling
This article was originally published on Manufacturingtalk on 10 Aug 2007 at 8.00am (UK)
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The first consideration, which must be made when Hi-Helix end mills are to be used, is selecting the correct one.
This choice is based on two considerations: type of material to be cut and available rev/min at the spindle.
When starting the end milling operation, the radial and axial depth of cut is usually predetermined according to the part configuration.
Table feed rate will establish the metal removal rate.
Table feed rate (ipm), is the product of the spindle speed (rev/min), feed per tooth (ipt), and the number of flutes (T, teeth), the cutter has, (ipm = rev/min x ipt x T).
Inherent to milling machines is that spindle speed is independent of table feed.
Thus, increasing the rev/min cannot increase the metal removal rate.
An increase in rev/min will, in contrast, decrease the feed per tooth and reduce the chip thickness.
If an increase in the metal removal rate is required, the table feed must be increased.
This may be achieved in various ways with different effects.
1 - Decrease cutting speed (rev/min) and maintain table feed.
This will increase the chip thickness, which directly relates to the feed per tooth and increases the metal removal rate.
2 - Increase table feed (ipm) but maintain cutting speed (rev/min).
This also increases the chip thickness/feed per tooth.
3 - Decrease the number of flutes (T) maintaining cutting speed and table feed.
By decreasing the number of flutes this, in turn, will increase the chip thickness and metal removal rate.
* Eccentric relief - Eccentric Relief is a positive arched cutting edge: a convex surface versus a concave (hollow ground) surface.
An eccentric relief increases the strength of an end mill's cutting edges.
P and M Regrinds uses a fine grit wheel to grind the primary and secondary relief angles as opposed to a 600 grit wheel, which most of the industry uses.
Moreover, with eccentric relief, the tool does not have to be honed, thus retaining coatings and creating an even stronger cutting edge.
Hi-Helix End Mills are manufactured with an eccentric relief.
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