Cutting Melamine faced chipboard

[Ger21]

The reason that some people do a climb pass first, followed by conventional, is this.
At high chip loads like this, the cutting forces are pretty high, and with a conventional cut, will tend to pull the tool into the part, resulting in a slightly undersized cut.
This can also happen when onion skinning. The first pass will pull the tool into the material, but the final pass will be more accurate, and leave a small lip on the bottom of the part.
By doing a climb cut first, the tool is actually pushed away from the part, which leaves a small amount of material for the final, conventional cut.
But the climb cut won't cut as clean, especially as the tool starts to wear, so it may leave chips that won't be removed on the final pass.

[NPW_BESPOKE]

The reason that some people do a climb pass first, followed by conventional, is this.
At high chip loads like this, the cutting forces are pretty high, and with a conventional cut, will tend to pull the tool into the part, resulting in a slightly undersized cut.
This can also happen when onion skinning. The first pass will pull the tool into the material, but the final pass will be more accurate, and leave a small lip on the bottom of the part.
By doing a climb cut first, the tool is actually pushed away from the part, which leaves a small amount of material for the final, conventional cut.
But the climb cut won't cut as clean, especially as the tool starts to wear, so it may leave chips that won't be removed on the final pass.

Thanks again Gerry
Great info - this I feel will become a major part of my machines work so much appreciate being pointed in the right direction...

Now to go and play...
Thanks again
Nicko

[EddyCurrent]

One of the best methods to achieve a full depth cut is to use a trochoidal machining operation.
CamBam has an excellent plugin for such cuts if your current software does not.; http://www.atelier-des-fougeres.fr/C...choPocket.html

[Ger21]

There's no need for trochoidal toolpaths when cutting wood, and certainly not when cutting cabinet parts.