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19-03-2019 #1
Thanks very much for your input. Loved the new video of part one of the pedal car build. Very nice. I wish I could be as neat, clean, and precise as you are. Trunking might be a problem as the gap between inner and outer boxes is only 10mm. But I'm working on baffle boxes to run air and cables in and out.
Thanks man. I removed all four castors and the table/bench now sits on two planks on the floor. I had to use a car jack to lift it and unbolt the castors haha. Was scary.
First sound test completed. This is with a wood router placed inside the box and the cable simply hanging out the bottom of the door ( squished by the latches). Router is at max rpm. The front panel/door has a single polycarb window 4mm thick on the inside. I will be putting one outside too. I did a small test with my phone playing music inside the box, and the sound leakage was definitely coming mostly through the polycarb, so with a second sheet in place, I expect the sound level to drop further. Listen for the drop in sound level once the third clip is latched.
Honestly, I can't believe how quiet it is. My hand saw makes more noise on each stroke than this. I can still hear ambient noise while this is running. I suppose the true test will be when it starts cutting material like aluminium.
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21-03-2019 #2
Sound Test 2
I've added the outside polycarb window to create a double glazed effect.
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24-05-2019 #3
What are you doing about cooling inside the box? My first CNC machine was built into a closed box but it got far too hot inside. I burnt out the motor of my Makita C700 router by installing it in a temporary installation with insufficient cooling air circulation so can say from experience that this matters. I'd also be concerned about the build up of chips and the consequent fire risk if you have no dust extractor in there. I had some experience of that as well, it was why I finally decided to dissmantle the box.
I've just switched from using a brushed router (a Chinese clone of the same C700) to a 2.2kW water cooled brushless spindle on my CNC router and the drop in noise is amazing. Now it's the dust extractor that makes the most noise and there is no high pitched scream which could be heard for some distance outside my shed.
KitAn optimist says the glass is half full, a pessimist says the glass is half empty, an engineer says you're using the wrong sized glass.
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24-05-2019 #4
Thanks for your comments Kit.
I installed a baffle box and extraction fan pretty early on. It does a good job and motors barely get warm, though my jobs aren't much longer than around 20 mins.
As for the fire risk, I NEVER leave the shed when the CNC is powered up. If I have to go somewhere, I switch off and make sure EStop is engaged. I also have a fire extinguisher next to the machine.
I've been running the 2.2kw water cooled spindle from day one :). I still need a decent dust extraction system though. Working on it.
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