# Warming up spindle **URL:** \ **Category:** šŸ“„ General\ **Created:** [February 19, 2026, 2:59am UTC](https://forum.sienci.com/t/warming-up-spindle/25761 "2026-02-19T02:59:25Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![miles](https://forum.sienci.com/user_avatar/forum.sienci.com/miles/32/11665_2.png) [@miles](https://forum.sienci.com/u/miles)\ **Post date:** [February 19, 2026, 2:59am UTC](https://forum.sienci.com/t/warming-up-spindle/25761/1 "2026-02-19T02:59:26Z")
Does anyone warm up their spindle prior to running their first job of the day, or consider it unnecessary? I was surprised to not see this mentioned in any docs for the Sienci spindles. ---
**Author:** ![Jens](https://forum.sienci.com/letter_avatar_proxy/v4/letter/j/d2c977/32.png) [@Jens](https://forum.sienci.com/u/Jens)\ **Post date:** [February 19, 2026, 3:35am UTC](https://forum.sienci.com/t/warming-up-spindle/25761/2 "2026-02-19T03:35:48Z")
I donā€™t, other people feel it is necessary. Pick your poison. ---
**Author:** ![StephenCampbell](https://forum.sienci.com/user_avatar/forum.sienci.com/stephencampbell/32/6018_2.png) [@StephenCampbell](https://forum.sienci.com/u/StephenCampbell)\ **Post date:** [February 19, 2026, 4:23pm UTC](https://forum.sienci.com/t/warming-up-spindle/25761/3 "2026-02-19T16:23:30Z")
Hey @miles, Great question. If your spindle is sitting in a cold shop overnight, it would benefit from a warmup. Here is a file you can run to give you a 10 min warmup session, before you start making chips fly. Weā€™ll be adding it to our resources too. [Sienci 1.5kW Spindle Warm-up.gcode](https://forum.sienci.com/uploads/short-url/zyZ34om53dS4AvKpbb74zDR7Klt.gcode) (82 Bytes) Cheers, Stephen ---
**Author:** ![Chucky\_ott](https://forum.sienci.com/user_avatar/forum.sienci.com/chucky_ott/32/8692_2.png) [@Chucky\_ott](https://forum.sienci.com/u/Chucky_ott)\ **Post date:** [February 19, 2026, 4:39pm UTC](https://forum.sienci.com/t/warming-up-spindle/25761/4 "2026-02-19T16:39:42Z")
@StephenCampbell Why not add it as a tool along with surfacing, squaring, et al.? ---
**Author:** ![Spamming\_Eddie](https://forum.sienci.com/user_avatar/forum.sienci.com/spamming_eddie/32/7296_2.png) [@Spamming\_Eddie](https://forum.sienci.com/u/Spamming_Eddie)\ **Post date:** [February 19, 2026, 4:49pm UTC](https://forum.sienci.com/t/warming-up-spindle/25761/5 "2026-02-19T16:49:44Z")
Please add a tool to warm up the shop! ---
**Author:** ![StephenCampbell](https://forum.sienci.com/user_avatar/forum.sienci.com/stephencampbell/32/6018_2.png) [@StephenCampbell](https://forum.sienci.com/u/StephenCampbell)\ **Post date:** [February 19, 2026, 6:54pm UTC](https://forum.sienci.com/t/warming-up-spindle/25761/6 "2026-02-19T18:54:06Z")
Hey @Chucky_ott, I really like where your head is at. Stay tuned in for more improvements to gSender! Cheers, Stephen ---
**Author:** ![TDA](https://forum.sienci.com/letter_avatar_proxy/v4/letter/t/839c29/32.png) [@TDA](https://forum.sienci.com/u/TDA)\ **Post date:** [February 19, 2026, 7:18pm UTC](https://forum.sienci.com/t/warming-up-spindle/25761/7 "2026-02-19T19:18:29Z")
Usual preface, Iā€™m with PreciseBits. So while I try to only post general information take everything I say with the understanding that I have a bias. You should always warm the spindle up before cutting. This due to the fact that the bearings slightly swell at running temp and that is the size they are specā€™ed to run at (where everything is ā€œtightā€). If you load it cold thereā€™s some slop in the bearings that can lead to accelerated wear, more runout, and/or in the worst cases damage. Additionally, the grease in the spindle will ā€œsettleā€ and it needs to be warmed up to get where itā€™s suppose to be. Hope thatā€™s useful. Let me know if thereā€™s something I can help with. ---
**Author:** ![Rdaigneault](https://forum.sienci.com/letter_avatar_proxy/v4/letter/r/bbe5ce/32.png) [@Rdaigneault](https://forum.sienci.com/u/Rdaigneault)\ **Post date:** [February 21, 2026, 5:34pm UTC](https://forum.sienci.com/t/warming-up-spindle/25761/8 "2026-02-21T17:34:08Z")
Is there a warmup file for the 2.2 k Sienci spindle? Could we get the link? Iā€™m going to start warming my spindle Thank you! Rick ---
**Author:** ![DavidB](https://forum.sienci.com/letter_avatar_proxy/v4/letter/d/76d3ee/32.png) [@DavidB](https://forum.sienci.com/u/DavidB)\ **Post date:** [February 21, 2026, 6:45pm UTC](https://forum.sienci.com/t/warming-up-spindle/25761/9 "2026-02-21T18:45:19Z")
Adding to gSender will be nice improvement. I know I would use it for the unheated area the AltMill will live in. ---
**Author:** ![gwilki](https://forum.sienci.com/user_avatar/forum.sienci.com/gwilki/32/366_2.png) [@gwilki](https://forum.sienci.com/u/gwilki)\ **Post date:** [February 22, 2026, 12:48am UTC](https://forum.sienci.com/t/warming-up-spindle/25761/10 "2026-02-22T00:48:03Z")
@Rdaigneault @DavidB Excuse my ignorance, but why do you need a file? Canā€™t you simply turn the spindle on and run it until it warms up? ---
**Author:** ![Rdaigneault](https://forum.sienci.com/letter_avatar_proxy/v4/letter/r/bbe5ce/32.png) [@Rdaigneault](https://forum.sienci.com/u/Rdaigneault)\ **Post date:** [February 22, 2026, 1:12am UTC](https://forum.sienci.com/t/warming-up-spindle/25761/11 "2026-02-22T01:12:02Z")
News to me. I didnā€™t know this at all. When I assembled my altmil this wasnā€™t in the instructions. My search also revealed that to properly warm up the spindle, you run it in stages of 25% speed, 50% speed 100%. The g- code manages that for you. I looked in Sienci resources and there is a g-sender file for spindle warmup. In that section, Sienci recommends warming up the spindle. Code and text below. For regular maintenance of your spindle, we recommend running a shorter ā€œwarm upā€ g-code. [Sienci Spindle Warm up.gcode](https://drive.google.com/file/d/1u5Tu5QdECCNx7W3NW7HJd1eErZ1Ggvyv/view?usp=sharing) ---
**Author:** ![lcmetalworx](https://forum.sienci.com/user_avatar/forum.sienci.com/lcmetalworx/32/5816_2.png) [@lcmetalworx](https://forum.sienci.com/u/lcmetalworx)\ **Post date:** [February 23, 2026, 4:04am UTC](https://forum.sienci.com/t/warming-up-spindle/25761/12 "2026-02-23T04:04:09Z")
Itā€™s silly really unless you have a ridiculous cold shop for some reason. I keep the shop between 60-75 F usually. I sometimes turn it on while Iā€™m getting setup for a few minutes. Thatā€™s all thatā€™s necessary really just to make sure the bearings arenā€™t starting up and going under load immediately when cold. ---
**Author:** ![Crazy8sCommando](https://forum.sienci.com/letter_avatar_proxy/v4/letter/c/22d042/32.png) [@Crazy8sCommando](https://forum.sienci.com/u/Crazy8sCommando)\ **Post date:** [March 12, 2026, 2:39pm UTC](https://forum.sienci.com/t/warming-up-spindle/25761/13 "2026-03-12T14:39:41Z")
As with the large CNC machines, a program allows the user to do other things while the spindle runs through various speeds to slowly warm the bearings in stages. Typically a dwell is added to multiple speed commands so you hit go, it runs through the stages over 15 minutes or so and you can get coffee, prep material, hold a seance or whatever you need to start the day. šŸ˜ Think of it like a car - when you start your car do you immediately mash the gas everywhere you go or do you accelerate gradually A to B? Same principle with the spindle. (And at least the car has an oil pump šŸ˜‰)