Newbie looking at 6040 (China CNC) for polypropylene 15mm sheet

[Zeeflyboy]

Which bits are those?

Side finish is a bit poor, looks like a lot of chatter. Chips are also a bit small and fluffy suggesting too slow a feed rate. What bits and what feeds/speeds?

This is the sort of wall finish you should be able to get out of this machine with a bit of practise




You can set max depth under multiple passes in fusion, even on the adaptive stuff.

[JOGARA]

https://www.amazon.co.uk/gp/product/...?ie=UTF8&psc=1

Think your right about feed rate. Upped it to 0.01 per tooth.
Was on 0.004

You can set max depth under multiple passes in fusion, even on the adaptive stuff.

That's it. Found it now.


[edit]
Still got chatter.

[edit2]
Upped my feed rate in Mach3 to 200%. Improved a bit.
Here are the F&S that I am going to try now.

Previously it was 0.01 per tooth.

[Zeeflyboy]

that's quite long for a 1/8 bit... you'll need to be fairly gentle with DoC to avoid bending the tool. Insert the tool so that you have minimum necessary exposed shank to help minimise flex.

Then try something more like 18k rpm, feed down to 600ish and I wouldn't go much beyond 0.5-1mm DoC at first with a tool that long/thin. You could try a bit deeper with adaptive type strategies (although perhaps limit the step over it allows to reduce loading on the tool.

[JOGARA]

Let it rip at full speed.


Had it weld towards the end causing a few problems. Air pressure was low because it has gone 9PM.
Doesn't look like it stuck to the bit that much. I was able to pick it off with my nail.



Ill try it now at 0.5mm DoC at those rates.
Was at 1mm (went off the rule of it being half the width?).

[Zeeflyboy]

Looks a bit better, see my edit just above your last post for some further thoughts.

[JOGARA]

Saw it and will be testing it out tomorrow!


Also, just found a 2 flute 6mm...
Must have come with the machine xD

Might give that ago tomorrow too..


Mobile footage of the last cut.

[Zeeflyboy]

looks pretty good in the video

I found the cutters that came with the machine fairly crap btw

[JOGARA]

looks pretty good in the video

I found the cutters that came with the machine fairly crap btw

Thus why I did not bother with them :p
Ordering a few off shop-apt tonight. Hopefully they will come Wednesday.
Will still try the 6mm they gave us. Worth it.

The only problem with the video was the cooling, which I expected because the compressor was low.