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.6 KW chinese spindle

Posted: Tue Feb 02, 2016 2:01 am
by oskanaan
I've been using the dw660 for a while now and I am very happy with it, but I'm not able to run the machine at night due to the very loud noise it generates especially when using .25 inch bits. I am going to switch to a chinese spindle as I've read that they are much more quiet. I wanted to know from your experiences what to expect when running long jobs. Some of the jobs I run take around 3 hours to finish, and sometimes the machine runs for 7 hours a day with short intervals of rest (10 minutes or so).

Would a DC spindle handle those long runs?
When it fails, should I expect to see some fireworks :)?
Would you recommend staying away from those types of spindles?

Cheers!

Re: .6 KW chinese spindle

Posted: Tue Feb 02, 2016 1:31 pm
by Estlcam
The main source of noise for air cooled spindles is usually the fan and as far as I know the .6kW spindles are just air cooled DC motors.
If you want something silent have a look at watercooled spindles.

However the fan noise is just one aspect - cutting material makes noise, too.
This is something you can't influence with the spindle - it just depends on the material you're cutting, the way it is clamped and the tool - and may be much worse than the spindles fan sound.
So if the spindle running idle at full rpm is OK - but cutting material is not a different spindle won't help much.

By the way: I'd never ever leave a cnc mill run unattended - it may burn your house down!
We've had a case here in Germany just a few months ago where a shed was totally destroyed just because the owner left for a few minutes to get a coffee or so. In this case an overheating vac started the fire.
I also have first hand experience with a broken endmill igniting MDF just by friction (nothing serious happened and the fire went out by itself after I pulled the plug - but it created insane amounts of smoke within just a few seconds and teached me a lesson).

.6 KW chinese spindle

Posted: Tue Feb 02, 2016 2:39 pm
by Jimf
I have a water cooled spindle. Very little noise from the spinning motor but once the end mill starts cutting, the noise from the cutter can be just as loud as a router. It really depends on how deep/fast you cut. If you only do light engraving, there is much less noise.

I also put a remote camera on the cnc that I can view on my phone. If I have to leave the room for a minute ie. Bathroom break, I can still see what's happening. A remote estop would be nice. Also smoke detectors in the shop is highly recommended.