The Quiet Cut Spindles Have Arrived!

We have been using these Quiet Cut spindles internally for quite a while.  We absolutely love them and everyone who sees and/or hears them, loves them too.  The first thing to love is the sound level.  They are very, very quiet.  In a slightly noisy office, workshop or hackerspace you may not even know that it is on.

The second thing to love is the collet.  The collet is the part of the spindle that clamps the bit.  The collet is a standard ER11-A.  It comes with a collet for 1/8" shank bits, but we also sell collets for 3/16" and 1/4" shank bits.  We sell additional collet nuts too in case you want to pair your collets with nuts to save time when swapping sizes.

The third thing to love is the power.  These have over twice the power of a rotary tool.


We have an awesome and totally comprehensive blog post about using this spindle on a Shapeoko with spindle control via grbl or TinyG in the works.  It should be done shortly after Maker Faire.  In the mean time, this quick blog post will go over the basics.


The standard Shapeoko Universal Motor Mounts work very well to mount this spindle, but tends to mount it a little high.  It is easy to modify the Z axis to make it work.  You can either slide the Z axis MakerSlide down a little or swap the positions of the Z axis lead screw nut and upper mounting bracket to bring the spindle down a little.

We also sell a beefy standard mounting bracket, but these don't have a mounting pattern for a Shapeoko.

We have a custom Shapeoko mounting solution in process, but that won't be available for several weeks.


These are DC powered devices.  You can power them with 24-48 Volts DC.  For best performance you want to be closer to 48VDC.  These draw up to 300 Watts which is probably more than your current power supply can deliver.  We recommend an a power supply with at least 6 amps, like this one.  If you directly connect the spindle to the motor, you should install a switch between the motor and the power supply.  If you try to turn on the spindle by turning on the power supply.  The power supply may enter current protection mode and need to be turned of to reset the problem.

Be sure to set the proper line voltage 100VAC or 220VAC with the switch on the side of the power supply before you power it or you could damage it.

Speed Control.

The top speed is about 12,000 RPM.  The speed can be controlled by varying the voltage or with a dedicated speed control circuit.  We sell this circuit.  It comes with a knob and pot to control the speed, but it also can accept a 5V PWM signal to control the speed.

This circuit can accept DC or AC up to 110 Volts.  Using AC is for advanced hackers only.  It exposes dangerous voltages and the range of the control must be limited to the lower end because it will output too much voltage for the spindle.  You could damage the spindle or speed controller.


A typical circuit would look like this.

Here are some more instructions.

How Quiet is It?

We don't have professional sound level measuring tools or an anechoic chamber, but for a simple comparison, I used a cell phone sound pressure level meter app.  The rotary tool had about 75dB of noise and the DC spindle had about 67dB of noise.  The dB scale is a logarithmic scale so each 3dB is about twice the noise level.  This means the rotary tool is roughly 7-8 times louder.

Here is a photo of the app measuring the rotary tool.


The spindles briefly pull a lot of current at turn on.  We have noted that this can cause some power supplies to go into current protection mode.  The best way to avoid this is to use a speed controller.  The speed controller should be turned off when the power supply's AC power is applied.  Once AC power is connected, turn on the spindle with speed controller.  If a power supply goes into current protection mode, you can clear the error by unplugging the power supply for at least 10 seconds.


JDM929 said…
Can you show how you have this wired into the rest of the machine?

You recommend 48V power for this spindle, but the controller boards for the ShapeOko take 24V, which means an additional power supply or other some other complexity, such as a voltage converter to drop 48V to 24V.
JDM929 said…
How do you have this powered then? Can you show how you wire these machines?

The boards you sell for Shapeoko run on 24VDC. You recommend 48V for this spindle. I'm not sure how to make this work, a second power supply? Maybe some kind of voltage reducer from 48V to 24V for the controller?
Anonymous said…

I added a little more info to the post that might help. You do need another power supply. We will be doing a very complete blog post very soon. This post was just to get give the early adopters a head start.

Hoser said…
I'm attempting to use this setup without the speed controller. I believe I have everything wired correctly and I am able to measure output from the power supply at 47.4V when the spindle isn't attached to it. When I have the spindle attached, it begins to spin and then the power supply shuts itself off (like overcurrent protection). Can this power supply not run the spindle at full speed without shutting down?
Unknown said…
dB is logartimic, because ear is logaritmic... :-) that's why teh scale is done so... So you won't hear 8x more quiet...
ai-yo said…
The max RPM seems targeted seems a little slow. Any plans for a faster version?

ai-yo said…
The max RPM seems a little slow, at least for wood. Is there a faster version planned?

Anonymous said…
We find the RPM to be fine. We even run some jobs at less than full speed. We have about 5 functional Shapeokos in our workshop. We have a lot of spindle options, but we have converted them all over to quiet cut spindles.
PArgyropoulos said…
How about the torque of this spindle? Is it greater than dremel's?
Anonymous said…
Hi PArgyropoulos,

Here are some specs:
Operating Voltage: 48VDC
Speed: ~12,000 RPM
Diameter: 52mm OD on the body of the spindle.
Length: The body is 90mm long
Overall Length: 175mm, including fan and collet nut.
Spindle Runout: ~0.0006"

Torque equals the horsepower multiplied by 5252. To get the horsepower you take the Watts divided by 746. So in this case you first take 300W/746 then multiply that times 5252 which will give you torque. Further divide that number by the RPM and the result is the torque in lb-ft., which is foot-pound or pound-foot, the traditional unit of measurement for torque.

Read more :
Unknown said…
300W is the input power (consumption). The output (useful) power should be less. Based on the manual of other spindles (kress fme1050, dw660) the output power is about half 50-60%.
PArgyropoulos said…
Hi Samantha,
thanks for your reply.
From what I know, dc motors differ from ac motors in terms of torque and efficiency, at least in theory. So is it safe to use your calculations to copmare the AC Dremel with the DC spindle?

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