Author Topic: Mini CNC  (Read 4528 times)

Stonemull

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Re: Mini CNC
« Reply #45 on: September 07, 2017, 03:54:53 AM »
Thought I would look at bracing the X rods before I bite the bullet and buy probably a pair of SBR12 rails. Pulled out designspark mechanical and was going to 3D print something.
The end clamps are called SK8 and the dimensions show 20mm from base plate to centre of rod, so needed 16mm thick support, figured 16mm MDF might do the job to experiment with, mine is actually about 16.2mm thick so I chopped out a couple of bits of scrap and wedged it down the back.
Then I tried end milling with a 5mm 4 flute on my chunk of billet aluminium I melted down in the forge, waaaaay more successful, trying to lift the Z needs a great deal more force, now it seems to have most play in a rotating like moment.
I could however both end mill and clean up the side, a lot more chips flying than previously.

edit: better image of side..

« Last Edit: September 07, 2017, 04:11:44 AM by Stonemull »
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Stonemull

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Re: Mini CNC
« Reply #46 on: September 07, 2017, 08:08:50 AM »
To give an idea of noise I uploaded a short video, this is 500mm/min, 1mm Z steps though this is the final pass of the roughing cut and is 0.5mm depth.
Stupid parallel X machining, I originally processed it correctly using Waterline machining (vector instead of raster basically) .. except the feed rate was 1500 and cut depth 2mm and the first lap scared the crap out of me and also ran into one of the clamps.
I was knocking up a quick holder for the mill bits in their plastic cases to do on the 3D printer then thought I might see how the mill goes with it. Well it was noisy and took 1,5 hours, so 3D printing it would have been a lot faster, cleaner and produced a better item :)

Also .. just noticed looking at the gcode that it must have defaulted back to a 3mm end mill instead of the 5mm I had in the machine .. so many traps for unobservant young players. So My 13mm cutouts are actually 15mm..


https://www.youtube.com/watch?v=RkLCuk-plac
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Elephantman

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Re: Mini CNC
« Reply #47 on: September 10, 2017, 04:18:21 AM »
Well the kit arrived 8 days afte rordering in Dariwn. Thats amazingly quick compared to other china orders I've done.

It's together it's functionally tested, but tool bits haven't touched anything yet. I can see it bein gloud, and messy so i neeed to move it outside somehow and need setup without a 15m long USB lead.

I've setup a Raspberry Pi 3 with CNCJS. All is working quite well, remote control from a  webpage on any device, (PC, tablet, mobile phone).

Now, what to test with, and what program to create GCode in???

I"ve been using tinkercad a lot, and have fusion 360, but still on the learning curve with that.
ArtCAM came with the kit, but haven't had a chance to open and test that yet.

A tip for others, I assumed no instructions as the aliexpress page says no instruction supplied, but if you grab the CD that comes with it, it has instructions on there not just serial port drivers.

Anyway time for bed, I'm on early shift all week.



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treinbert

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Re: Mini CNC
« Reply #48 on: September 10, 2017, 05:36:29 AM »
I have a feeling the CNC-cutting is a strange order. Why not deep mill each compartment at a time, and at the end mill the surrounding rim? This would be done relative easy with some simple G-code.
I think it is a lot faster, than a kind of raster as you have done at the moment.
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Stonemull

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Re: Mini CNC
« Reply #49 on: September 10, 2017, 08:28:46 AM »
I have a feeling the CNC-cutting is a strange order. Why not deep mill each compartment at a time, and at the end mill the surrounding rim? This would be done relative easy with some simple G-code.
I think it is a lot faster, than a kind of raster as you have done at the moment.

Quote
Stupid parallel X machining, I originally processed it correctly using Waterline machining (vector instead of raster basically) .. except the feed rate was 1500 and cut depth 2mm and the first lap scared the crap out of me and also ran into one of..
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Lob0426

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Re: Mini CNC
« Reply #50 on: September 10, 2017, 10:39:30 AM »
LOL!

I have a clamp that has a little 30deg nip from a corner too! Sounded real bad as it is a steel clamp and I was cutting at Aluminum speeds.
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Stonemull

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Re: Mini CNC
« Reply #51 on: September 10, 2017, 04:54:05 PM »
It was deep enough into the wood that the 6mm shank hit the clamp before the 5mm mill so I was spared the horrible noises.

Got a message from this guy on reddit lsst night, check out e video of this beast ..

https://github.com/madcowswe/ODriveFirmware
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wild.bill

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Re: Mini CNC
« Reply #52 on: September 17, 2017, 07:54:31 AM »
another idea for a small CNC
[url]http://www.instructables.com/id/Cheap-Scalable-Arduino-CNC-Plotter-Mill-3D-Printer/?utm_source=newsletter&utm_medium=email/url]
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treinbert

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Re: Mini CNC
« Reply #53 on: September 17, 2017, 08:12:43 AM »
Hartelijke groeten/Best regards/Freundlichen Gruessen,
Bert Mengerink

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ThothLoki

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Re: Mini CNC
« Reply #54 on: September 17, 2017, 12:46:42 PM »
another idea for a small CNC
[url]http://www.instructables.com/id/Cheap-Scalable-Arduino-CNC-Plotter-Mill-3D-Printer/?utm_source=newsletter&utm_medium=email/url]

Just saw that in my email! Looks just like the MPCNC on Thingiverse
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