Re: ON topic- Flycutting ALuminium

PrecisioNmachinisT wrote:
"BottleBob" <bottlbob@xxxxxxxxxxxxx> wrote in message
news:13pua6ffl3tq1d7@xxxxxxxxxxxxxxxxxxxxx
Jeffrey Lebowski wrote:


Actually the workpiece or machine elements will always deflect some
small
amount under cutting pressure and so the least amount of distortion will
be
had when you have only a single tooth engaged.

JL:

Correct me if I'm wrong, but it seems to me that at the same RPM and
feedrate a two insert cutter will have half the chip load per insert
than a one insert cutter, and therefore have about half the cutting
forces on the machine elements.


Bob, normally one would increase the feedrate when adding teeth--fairly
basic machining economics the premise where proper application of a higher
spindle horsepower results in a cooresponding production rat increase.


PM:

IPM = FPT (chip load) X T (Number or teeth) X RPM

So a one insert/flute cutter with a chip load of .010 and a 7500 RPM would have a feed rate of 75 IPM.
A two insert/flute cutter would be double that at 150 IPM.

Is there going to be more, less, or the same, amount of distortion of machine elements if a two insert cutter is used in place of a one insert cutter at the same chip load per flute?


--
BottleBob
http://home.earthlink.net/~bottlbob

.

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