85 revolutions per inch, times the number of flutes = cuts per inch. A two
flute cutter would be chomping off 0.005882 per flute per cut. A single flute
would be 0.011765
Using a down spiral cutter, where does the waste go? Even with a super strong
vacuum system it could carry around and pack up in the flutes on the advancing
side instead of being ejected on the trailing side.
The only place I know of where Pi = 3 is in Bob Shaw's Wooden Spaceships
trilogy, a fact revealed at the end of the third book. (Too bad he died before
writing the 4th book.)
From: Bruce Layne <linux...@thinkingdevices.com>
To: Enhanced Machine Controller (EMC) <emc-users@lists.sourceforge.net>
Sent: Tuesday, May 24, 2016 11:42 AM
Subject: Re: [Emc-users] Tool Marks?
I like Chris' analysis, but when I do the math, I get 85 revolutions per
inch instead of 8.5 revolutions per inch.
Also, my pi is 3.1416, so I get 1.273 revolutions per inch when rolling
the .250" diameter cutter. Chris got 1.33, so his pi must be 3, but I'd
say that's within engineering tolerance. :-)
On 05/24/2016 01:10 PM, Chris Albertson wrote:
> Lets see, 200ipm turning 17,000rpm comers to 8.5 revolutions per inch.
>
> Think about it this way, if you rolled the 1/4 router but over the
> wood you would have 1.33 revolutions per inch. it would not cut at
> all because there is no relative motion between cutter and wood. But
> you are getting to close to this and the spiral pattern of the cutter
> is showing up in the wood. Vibrations at a frequency that is small
> multiple of the repeats of the spiral pattern of the cutter
>
> Try the same cut at a MUCH slower speed.
>
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