Thoughts on this article?
https://www.harveyperformance.com/in-th ... HCw4NsM_Kk
Gregg
climb vs conventional milling
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climb vs conventional milling
Gregg
Just let go of it, it will eventually unplug itself.
Just let go of it, it will eventually unplug itself.
Re: climb vs conventional milling
"During Conventional Milling, the cutter tends to dig into the workpiece and may cause the part to be cut out of tolerance."
By its nature, conventional milling causes the cutter to deflect **away** from the cut. If the part is out of tolerance, it's not because it has been gouged too deeply. The condition described is one that represents climb milling, not conventional milling.
Even machines with standard screw and nut design benefit by climb milling, although generally only as finish cuts, where cutting pressure is greatly reduced so the cutting action doesn't cause the part to self feed.
Climb milling has become acceptable BECAUSE of CNC operations. Those who use manual machines should be selective in when to do so.
While I agree with some things said, if that article was written by an engineer, it's clearly by one who has no machining experience.
H
By its nature, conventional milling causes the cutter to deflect **away** from the cut. If the part is out of tolerance, it's not because it has been gouged too deeply. The condition described is one that represents climb milling, not conventional milling.
Even machines with standard screw and nut design benefit by climb milling, although generally only as finish cuts, where cutting pressure is greatly reduced so the cutting action doesn't cause the part to self feed.
Climb milling has become acceptable BECAUSE of CNC operations. Those who use manual machines should be selective in when to do so.
While I agree with some things said, if that article was written by an engineer, it's clearly by one who has no machining experience.
H
Wise people talk because they have something to say. Fools talk because they have to say something.
Re: climb vs conventional milling
Harold wrote:
"if that article was written by an engineer, it's clearly by one who has no machining experience. "
Just think government regulations!
RussN
"if that article was written by an engineer, it's clearly by one who has no machining experience. "
Just think government regulations!
RussN
Re: climb vs conventional milling
I think the article has an unintentional error in the quoted part. I'm sure the writer meant climb milling as that's the subject of the paragraph, which is contrasted by the second paragraph on conventional milling. It's a brief article.
Standards are so important that everyone must have their own...
To measure is to know - Lord Kelvin
Disclaimer: I'm just a guy with a few machines...
To measure is to know - Lord Kelvin
Disclaimer: I'm just a guy with a few machines...
Re: climb vs conventional milling
One thing I hadn't considered is that the cut may be with the full diameter of the end mill. In that case, there is both climb and conventional cutting, and the end mill can cut a part undersized, depending on the direction of feed, where which side is climb changes. Good machining practice would dictate rough and finish cuts, so that shouldn't be a problem. If that's the case at hand, it should have been mentioned.
A pocket (or window, if you prefer) can be machined without leaving telltale signs of undercut in the corners if the pocket is roughed within three thou by conventional milling, then taken to size by climb milling. The opposing slide is eased off a touch as the end mill enters the corner, which helps eliminate chatter and leaves a perfectly smooth transition. The fine finish cut prevents hogging (self feeding) and leaves a superior finish, as the article claims. That has always been my method of operation running manual mills.
H
A pocket (or window, if you prefer) can be machined without leaving telltale signs of undercut in the corners if the pocket is roughed within three thou by conventional milling, then taken to size by climb milling. The opposing slide is eased off a touch as the end mill enters the corner, which helps eliminate chatter and leaves a perfectly smooth transition. The fine finish cut prevents hogging (self feeding) and leaves a superior finish, as the article claims. That has always been my method of operation running manual mills.
H
Wise people talk because they have something to say. Fools talk because they have to say something.