# Quiet cut spindle without speed controller **URL:** \ **Category:** Assembly\ **Created:** [August 17, 2016, 10:39am UTC](https://community.inventables.com/t/quiet-cut-spindle-without-speed-controller/26916 "2016-08-17T10:39:35Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![NikolaiKuznetcov](https://yyz1.discourse-cdn.com/flex009/user_avatar/community.inventables.com/nikolaikuznetcov/32/67541_2.png) [@NikolaiKuznetcov](https://community.inventables.com/u/NikolaiKuznetcov)\ **Post date:** [August 17, 2016, 10:39am UTC](https://community.inventables.com/t/quiet-cut-spindle-without-speed-controller/26916/1 "2016-08-17T10:39:35Z")
Hello. As it turned out in this topic i got the broken Spindle Speed Controller. > [@How to check that the Spindle Speed Controller works?](https://community.inventables.com/t/how-to-check-that-the-spindle-speed-controller-works/26871): > > Hi to all, I’m trying to assemble my first X-carve with Quiet Spindle using this tutorial: [http://blog.inventables.com/2014/06/shapeoko-upgrade-quite-cut-spindle-with.html](http://blog.inventables.com/2014/06/shapeoko-upgrade-quite-cut-spindle-with.html) Not successfull. Looks like my Spindle Speed Controller arrived broken initially. I gave him 48V to input terminal, but red led on the board doesn’t glows. Also on output terminal i have 0V. I disconnected all other modules, leave only 48V power supply and Spindle Controller. Must the red led glows on the Controller board … Therefore ripened a question: can i connect the Quiet cut spindle without a speed controller? Directly to 24V or 48V power supply? Is it save? I have got the quiet cut spindle 48V. And i’ve already tried to connect it to 24V power supply for short time. Spindle works well. But now i want to carve few holes in wood piece. It’s 18mm of pinus sylvestris. Thank you. ---
**Author:** ![LarryM](https://yyz1.discourse-cdn.com/flex009/user_avatar/community.inventables.com/larrym/32/51450_2.png) [@LarryM](https://community.inventables.com/u/LarryM)\ **Post date:** [August 17, 2016, 12:37pm UTC](https://community.inventables.com/t/quiet-cut-spindle-without-speed-controller/26916/2 "2016-08-17T12:37:59Z")
> [@NikolaiKuznetcov](#): > > Directly to 24V or 48V power supply? Is it save? You can connect the spindle directly to the 24/48 volt power supply without damaging the spindle. It will run at full speed with 48 volts. You would have to adjust your depth of cut and feed rate to match up with the spindle speed and the characteristics of the material that you are cutting. ---
**Author:** ![NikolaiKuznetcov](https://yyz1.discourse-cdn.com/flex009/user_avatar/community.inventables.com/nikolaikuznetcov/32/67541_2.png) [@NikolaiKuznetcov](https://community.inventables.com/u/NikolaiKuznetcov)\ **Post date:** [August 17, 2016, 6:23pm UTC](https://community.inventables.com/t/quiet-cut-spindle-without-speed-controller/26916/3 "2016-08-17T18:23:16Z")
Hm, guys from inventables recommend to don’t do it. ---
**Author:** ![LarryM](https://yyz1.discourse-cdn.com/flex009/user_avatar/community.inventables.com/larrym/32/51450_2.png) [@LarryM](https://community.inventables.com/u/LarryM)\ **Post date:** [August 17, 2016, 6:28pm UTC](https://community.inventables.com/t/quiet-cut-spindle-without-speed-controller/26916/4 "2016-08-17T18:28:34Z")
> [@NikolaiKuznetcov](#): > > Hm, guys from inventables recommend to don’t do it. Did they say why? It’s no different than running the speed controller with the potentiometer turned fully on, or using the speed controller with a speed setting of S12000 or above using the PWM control from grbl. ---
**Author:** ![NikolaiKuznetcov](https://yyz1.discourse-cdn.com/flex009/user_avatar/community.inventables.com/nikolaikuznetcov/32/67541_2.png) [@NikolaiKuznetcov](https://community.inventables.com/u/NikolaiKuznetcov)\ **Post date:** [August 17, 2016, 6:35pm UTC](https://community.inventables.com/t/quiet-cut-spindle-without-speed-controller/26916/5 "2016-08-17T18:35:53Z")
They have not led weighty arguments 🙂 Only that i can’t control the speed. I think they can’t advice to do something that didn’t arranged in their articles, just for save himself. ---
**Author:** ![CncWithMe](https://yyz1.discourse-cdn.com/flex009/user_avatar/community.inventables.com/cncwithme/32/32877_2.png) [@CncWithMe](https://community.inventables.com/u/CncWithMe)\ **Post date:** [August 17, 2016, 8:57pm UTC](https://community.inventables.com/t/quiet-cut-spindle-without-speed-controller/26916/6 "2016-08-17T20:57:09Z")
It should not be a problem if you are careful to make sure the spindle starts and watch your chip load. Starting the spindle at full speed requires a high amount of current and your current is related to your chip load (to a point). High current demands (at start up or with a higher chip load) could put the power supply into current protection mode (the power supply will turn off and stay off until it is reset by being unplugged for about a minute). The speed controller limits this current (starts the spindle slowly and prevents the power supply demands from getting too high) so the power supply dosen’t need to provide the higher current and will no go into protection mode. Assuming your power supply can survive the back emf and you are aware of the issues you should be fine. Watch to make sure it is not getting too hot just in case.