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

[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?).

[njhussey]

WD40 is good, a squirt every now and then or buy a mist system on ebay (£10 ish) and you'll be good to go...

Sent from my HUAWEI VNS-L31 using Tapatalk

[Zeeflyboy]

WD40 is good, a squirt every now and then or buy a mist system on ebay (£10 ish) and you'll be good to go...

Sent from my HUAWEI VNS-L31 using Tapatalk

I actually found some draper cutting oil the other day that works better than wd40 imo (doesn't smell as bad when it evaporates off a hot tool either!) https://www.amazon.co.uk/gp/product/...?ie=UTF8&psc=1

It's a good temporary solution to no coolant I reckon!

Mist system is the better long term solution though, you already have the compressor so it's not difficult to set one up from there.

[JOGARA]

I didn't think to turn the rpm down... Make sense :p

This is what i got in terms of mister.


Though it it either just air or a fire hose...


Got the three flute with the bobbled edges coming tomorrow.
So will get to try that out with the lower rpm on the two flute.
No single flutes for at least two weeks :/

Wonder if the Banggood ones are worth trying. Might have some in their EU warehouse.

[Zeeflyboy]

A mister unit will usually have two feeds going into it, an air line and a coolant line, and will have needle valves on both to vary the mix. They are generally designed to work on venturi but you are better off providing a pressurised coolant flow to them - you'll get bigger droplets rather than a pervasive fog.

I see yours looks to have a hose in the back for coolant but I see no second valve for controlling the flow, only a single valve which I assume is controlling the air flow.

this is the type I'm using http://www.ebay.co.uk/itm/Mist-Coola...8AAOSwUuFWzUwK

[JOGARA]

This one had a shitty one on the air feed.
Took it off as i have variable regulator on the compressor.

Going to look on eBay for a water tank with pressure feed inlet.

[Boyan Silyavski]

Here is an overview of my fog-less system and in video description are mentioned all major details so you can DIY one. A properly made one, i mean. Hope that helps you.

[JOGARA]

Any recommendations on bits for fillets?
Like a round over tool for routers.

Also looking for alternatives to something like the Haimer Universal 3D Sensor.

Was looking at Zeeflyboy's link to the TPA2 but need something soonish and cheaper :p

[JOGARA]

Does this look about right for this 3 flute roughing bit?
https://www.shop-apt.co.uk/economy-3...-diameter.html



I have a feeling that 3000mm/s is too much. Gwizard is saying 1000mm/s.