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file Frage aluminum cut

  • montes_ricard
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23 Aug 2018 12:32 #54489 von montes_ricard
aluminum cut wurde erstellt von montes_ricard
The 1 and 1.5mm drill bits break despite cutting aluminum in a water bath. What I can do?.

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23 Aug 2018 15:10 #54491 von ubo
ubo antwortete auf aluminum cut
Adjust speed and feed.

Gruß,
Uwe

WinPC-Nc V3, EstlCAM V11
www.cnc.kuckmalda.de

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22 Sep 2018 15:15 #54695 von Rory
Rory antwortete auf aluminum cut
Shallow pass depths... 0.1-0.2mm per pass and work from there

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29 Sep 2018 07:52 - 29 Sep 2018 07:53 #54726 von Doug
Doug antwortete auf aluminum cut
As Rory says, you need to shave the surface when cutting with aluminium.

I have successfully milled 1.2 mm thick aluminium sheet using small diameter two flute end mills with no air or liquid cooling. The grade of aluminium is important. Too soft/pure (e.g. 1050A) and it melts the aluminium.

I even managed to mill a 20 mm thick aluminium block with no cooling (once) using the Stepcraft.

Take a look at my posts. I have several YouTube videos illustrating this process and I mention appropriate feeds and speeds which work repeatably.

Regards.

Doug

Stepcraft 2/840, StoneyCNC industrial HF spindle, 4th axis, TurboCAD 2016 Professional 64 bit, MeshCAM, GWizard feeds & speeds calculator, UCCNC
Hobby use: guitar building (luthiery), www.facebook.com/DougShortGuitarBlog/
Letzte Änderung: 29 Sep 2018 07:53 von Doug. Begründung: Additional comment added.
Folgende Benutzer bedankten sich: montes_ricard

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11 Jul 2019 20:46 #57031 von Theg
Theg antwortete auf aluminum cut
Doug, what sort of cut did you do with the 20mm aluminium? I have spent the last 9 days!!!! trying to machine some relatively simple parts for a friend. my feeds are slow as, solid carbide 4 flute, cutting oil, cooling spray, 0.2mm pass, 4mm bit, HF spindle, etc etc. I have loads of experience, however the v2 840 has rattled its guide bearing loose 5 times now, worn the Y axis lead nuts, loosened the collet...…. no missed steps, no stress on any of the steppers, 37degs C in 24deg weather...….. I`m of the thought this machine is not fit for purpose.... id love for someone to prove me wrong without loads of mods? When the X access or Y axis tensions bolts loosen they cutters grabs the material and because there is zero rigidity it gets exacerbated violently with zero high draw protection. this isn't helped of course by the performance upgrade kit that has SS pins in the ally coupler that simply bend the ally and fall out...….

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19 Jul 2019 19:33 #57067 von Hurcokid
Hurcokid antwortete auf aluminum cut
10000 rpm, 0.25mm depth of cut, 150mm/min feed rate
Where possible Do Not plunge in, if need to then 10mm/min max
I used wd40, or very light oil prior to cutting to wet the cutter to prevent build up of ally on the cutting edge of the cutter.
To be honest anything wet will work prior to cutting.
KEEP fingers away at all times.
Apply with a long brush or spray.

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20 Jul 2019 18:17 #57076 von Cpt Wingnut
Cpt Wingnut antwortete auf aluminum cut
Hi,
Try using a single or two fluted mill, I found this Stepcraft blog helpful too.
www.stepcraft.us/blog/our-blog-1/post/optimal-settings-for-cutting-aluminum-on-a-stepcraft-cnc-system-3

I also ran a load of tests to see what works and what doesn’t. here are some results.
www.stepcraft-systems.com/en/forum/milling/5309-milling-aluminium
(the deeper cuts, 0.5, 0.7, 1mm were just to experiment).

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07 Aug 2019 14:52 - 07 Aug 2019 14:55 #57164 von Doug
Doug antwortete auf aluminum cut

Theg schrieb: Doug, what sort of cut did you do with the 20mm aluminium? I have spent the last 9 days!!!! trying to machine some relatively simple parts for a friend. my feeds are slow as, solid carbide 4 flute, cutting oil, cooling spray, 0.2mm pass, 4mm bit, HF spindle, etc etc. I have loads of experience, however the v2 840 has rattled its guide bearing loose 5 times now, worn the Y axis lead nuts, loosened the collet...…. no missed steps, no stress on any of the steppers, 37degs C in 24deg weather...….. I`m of the thought this machine is not fit for purpose.... id love for someone to prove me wrong without loads of mods? When the X access or Y axis tensions bolts loosen they cutters grabs the material and because there is zero rigidity it gets exacerbated violently with zero high draw protection. this isn't helped of course by the performance upgrade kit that has SS pins in the ally coupler that simply bend the ally and fall out...….

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Hi Theg.

The machine is not fit for the purpose of milling aluminium really, but some of us have managed to get it to work under optimal circumstances of mechanical tuning and very light cutting duty, low speeds and literally shaving the surface. It is a light duty hobby router, not any kind of milling machine. It's not rigid enough, even with the aluminium T-slot tables to sustain heavy milling of soft metals like aluminium. That said, the smaller footprint machines must necessarily be more rigid than our larger ones. In general, all users of the smaller footprint machines have experienced fewer problems getting them to run properly than those running the 2/840 machines.

You must use single or two flute cutters as has been stated; four flute cutters present too much resistance and lower spoil clearance. You also need to use small diameter cutters. 0.2 mm is still too large a depth IMO. I think I used a 4 mm diameter 2 flute cutter for the block, but I can't remember. I would recommend not trying a cutter larger than 3 mm diameter in fact.

I have experienced all the symptoms you describe except noticeable component wear and tear. I don't have details (video or cutting parameters) of the milling of the 20 mm thick block but it did work. I still have the block. I am not keen to repeat any aluminium milling endeavours to be honest. Here are the videos I do have on Youtube of cutting 1.2 mm thick plate:





Steer clear is my advice. If you bought your machine with the express intention of milling aluminium, I think that this was a mistake, sorry.

Doug

Stepcraft 2/840, StoneyCNC industrial HF spindle, 4th axis, TurboCAD 2016 Professional 64 bit, MeshCAM, GWizard feeds & speeds calculator, UCCNC
Hobby use: guitar building (luthiery), www.facebook.com/DougShortGuitarBlog/
Letzte Änderung: 07 Aug 2019 14:55 von Doug.

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