Re: [CAD_CAM_EDM_DRO] Re: Spindle alternative from noise view

http://cgi.ebay.com/1-5KW-AIR-COOLE-MOTOR-SPINDLE-ENGRAVING-MILLING-GRIND_W0QQitemZ220406174727QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item33513b5407&_trksid=p3286.c0.m14
<http://cgi.ebay.com/1-5KW-AIR-COOLE-MOTOR-SPINDLE-ENGRAVING-MILLING-GRIND_W0QQitemZ220406174727QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item33513b5407&_trksid=p3286.c0.m14>

I'm kinda interested in these spindles. 24k rpm would go REALLY fast
and improve the speed of these small-diameter tips.

They also make a water-cooled one. That should be able to keep the
bearings really cool, which will improve reliability. The thing is, air
cooling has much greater limitations on how effective it can be at
cooling high-power motors, it can introduce contaminants into the motor,
and shaft-driven fans (pretty common) don't work for crap on variable
speed motors. See, when a variable speed motor is run slower, that
typically means it's biting with higher torque and higher currents. It
doesn't necessarily reduce the heat generated in the windings and can
increase it. But, at lower speeds, the fan slows down too and its
cooling potential drops way down. That can be avoided if a separately
powered fan is used but that's rarely done.

Got no idea how I'd even mount it though. That spindle is just round
all the way around, with no place to bolt to. I guess a mount would
need to be milled that clamps it all the way around, but the clamping
force may cause the head angle to vary from completely true with the
axes. Being smooth and round, I fear that spinning inside the mount
under high torque loads might actually be a possible problem.

Danny

fourthaxis4000 wrote:

> Gabi,
> In the cutter diameter range you mention, you could consider the Proxxon 20165, which comes with a 43mm neck diameter for mounting, six collets up to 6mm and variable speed 900>6000rpm.
> At first glance it looks like a high speed router, but it's not. The included controller supplies PWM DC to the spindle, which is a low-speed milling head, direct drive without gearing.
> https://www.proxxon-world.com/product/direct_drive_spindle_armature_bfw_40_e_suit_bfb_2000_220-240v
>
> Larger cutters above 6mm would need reduced shanks as 6mm is the largest available collet. As for noise, I run one of these on a converted mill and it's almost deathly silent.
> Mark B
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "balsanu_gabi" <gabi.balsanu@...> wrote:
>
>> Hi to all,
>>
>> I have a Taig CNC mill with a Proxxon IB/E unit for spindle. I am very happy with that from accuracy and NOISE level point of view.
>> Now I want to buy a bigger mill with a bigger spindle. My need's for spindle are:
>> - variable speed (like Proxxon);
>> - 1-12mm dia tool capacity
>> - alum, brass and wood material for milling
>> - most important - LOW NOISE LEVEL
>> Noise level must be low because I will run my mill in my flat.
>> What choice do I have?
>>
>> Regards
>> Gabi
>>
>>
>
>
>
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