My first cnc router of wood (MDF)

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28 May 2016 21:31 - 29 May 2016 10:00 #75197 by Thomas
Hello all,

my first cnc router of wood (MDF) is almost finished. I used SketchUp to make the plans, this needs a lot of time, always when I thought its ready, I found something to make it better ;) I watched a lot of YouTube movies and read different forums threads and so i build my own cnc router step by step.

Technical specifications:

Dimensions: 1,169 mm long (46.02 inch), 760 mm wide (29.92 inch), 743 mm high (29,25 inch)

max. travel way: X-Axis 750 mm (29.53 inches); Y-Axis 450 mm (17.72 inches); Z-Axis 140 mm (5.51 inches)
used travel way: X-Axis 720 mm (28.35 inches); Y-Axis 420 mm (16.54 inches); Z-Axis 140 mm (5.51 inches)

supported rails 20mm (0.79 inches) on all axis
trapezoidal thread 16x4mm on all axis

reference switch: X- and Y-Axis (inductive proximity sensor switch); Z-Axis none
limit switch: Y-Axis 2; Z-Axis 1; (X-Axis same as reference switch)

Nema 23 stepper motors

Kress 1050 FME-1 milling motor

I'm using SketchUp v8.0 with SketchUCam and Estlcam8, and last but not least LinuxCNC :lol:
After 2 month engineer (including watching YouTube movies, reading forums, looking for software,...) and 2 month building I milled this week the first time :) . I was happy to see the machine working, but I also was frustrated about the noise. I live in a apartement and don't want to annoy my neighbors. So I started to build a box around my router and consequently I have to build a dust extraction too.
The box is almost finished and only dampening materials / insulating is missing. Because the router is now in the box, I have to build the dust extraction, that's it for the next week.

Until next time....

greetings Thomas








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Last edit: 29 May 2016 10:00 by Thomas.

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28 May 2016 21:45 #75199 by BigJohnT
Looks good!

JT

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28 May 2016 22:15 #75200 by lucky phil
Great Work

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28 May 2016 22:18 #75201 by tommylight
Neat !!! :)
As for the noise, you can change the spindle to a silent one, but as soon as it starts cutting the noise is back, so not much joy there.
Since you already have an enclosure in place, just get some sound dampening in, it might just get it to usable levels with the closed doors.
Regards,
Tom

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29 May 2016 09:56 - 01 Jun 2016 20:07 #75216 by Thomas
Kress company documentation says sound pressure level 78 dB(A) and noise power level 89 dB(A). My phone app decibel meter says the same, 77 dB(A) without cutting and box open, 62 dB(A) without cutting and box closed.

@tommylight: you're right, the most noise is coming from milling, not the milling motor itself. I'll make some insulating / sound dampening materials in it the next days to reduce the noise.

motor on, box open:



motor on, box closed:



Tomorrow I'm at work again and when I've finished the work, I'll take a professional decibel meter with home to measure the noise.
Yesterday I ordered 2 energy chain at ebay, i need it because the machine can't move in the box without cable mess :)
My project the next week ist to finish the box, building the dust extraction and the cable chain.
pictures following...
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Last edit: 01 Jun 2016 20:07 by Thomas.

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31 May 2016 11:07 #75276 by globaldynamix
This is my first CNC:
After many mistakes it is working ;) :

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31 May 2016 11:42 #75279 by andypugh
I am (part of the time) an NVH specialist for a car manufacturer.
When we want to put a part of the system in a box so that we can measure the noise level of another part, we build the box of plywood and line it with a special self-adhesive foam / lead / foam sandwich.

The foam / lead / foam material is the most effective thing for this job. You probably also should mount the whole router on a layer of foam to eliminate structure-borne noise through the table to the floor. Also make sure that your box is not touching the wall.

One of our vehicles had a very noticable noise in the driver cabin. It was eventually fixed by fitting a longer and softer engine earth strap. So don't assume that no noise can come down the wires.

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31 May 2016 15:54 #75294 by cncbasher
mount the router on some rubber feet , and the same with the case , and as andy says keep the box away from touching the walls . will help a great deal in isolation of noise .

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01 Jun 2016 19:43 #75307 by Thomas
sorry for my late answer, I was busy ;) Thank you all for your help

@globaldynamix: nice video, looks very good and professional ;)

@Andy: I made the box of particle board (hope is correct, in german "Spanplatte" or "Pressspanplatte"). Tomorrow will arrive my ordered damping foam.

@cncbasher: I have 3 mm rubber plates, I'll put them under the box and the router.

The box is almost ready, foam will arrive tomorrow and my dust extraction too...









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01 Jun 2016 23:48 #75311 by andypugh

@Andy: I made the box of particle board (hope is correct, in german "Spanplatte" or "Pressspanplatte"). Tomorrow will arrive my ordered damping foam.


www.carbuildersolutions.com/uk/lead-foam-sandwich-1m-x-300mm

Is the sort of stuff you might need.

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