# Spindle weight of 2.2Kw **URL:** \ **Category:** 📄 General\ **Created:** [August 27, 2026, 9:23pm UTC](https://forum.sienci.com/t/spindle-weight-of-2-2kw/27001 "2026-08-27T21:23:28Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![bobblack1](https://forum.sienci.com/letter_avatar_proxy/v4/letter/b/958977/32.png) [@bobblack1](https://forum.sienci.com/u/bobblack1)\ **Post date:** [August 27, 2026, 9:23pm UTC](https://forum.sienci.com/t/spindle-weight-of-2-2kw/27001/1 "2026-08-27T21:23:28Z")
have a mk2 w/extension kit. Can it handle the weight of a 2.2Kw spindle without sagging? Thank you, bob ---
**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:** [August 27, 2026, 11:07pm UTC](https://forum.sienci.com/t/spindle-weight-of-2-2kw/27001/2 "2026-08-27T23:07:23Z")
@bobblack1 Welcome to the group, Bob. Do you have the LongMill Mk2 or the AltMill Mk2? ---
**Author:** ![bobblack1](https://forum.sienci.com/letter_avatar_proxy/v4/letter/b/958977/32.png) [@bobblack1](https://forum.sienci.com/u/bobblack1)\ **Post date:** [August 28, 2026, 2:48pm UTC](https://forum.sienci.com/t/spindle-weight-of-2-2kw/27001/3 "2026-08-28T14:48:56Z")
sorry about that, Its a longmill mk2 w/extension to 48" bob ---
**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:** [August 28, 2026, 3:25pm UTC](https://forum.sienci.com/t/spindle-weight-of-2-2kw/27001/4 "2026-08-28T15:25:57Z")
@bobblack1 I don’t know from personal experience. Sienci says the following for your machine: " **Router / spindle:** can run in 15000 – 25000 RPM range with reliable speed feedback, 0-5V PWM control for spindles. Router / spindle cannot exceed 2.7kg (6 lbs)." The 2.2Kw spindle weighs about twice the recommended maximum. It’s noteworthy, I think, that on the store page for the 2.2 kw spindle, only the Altmills are listed as machines to add it to. FWIW, IMHO, I believe you are asking for problems if you go ahead with this. ---
**Author:** ![bobblack1](https://forum.sienci.com/letter_avatar_proxy/v4/letter/b/958977/32.png) [@bobblack1](https://forum.sienci.com/u/bobblack1)\ **Post date:** [August 28, 2026, 4:13pm UTC](https://forum.sienci.com/t/spindle-weight-of-2-2kw/27001/5 "2026-08-28T16:13:13Z")
thank yo,. I am glad I asked. You probably saved me a lot of aggravation, bob ---
**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:** [August 28, 2026, 5:11pm UTC](https://forum.sienci.com/t/spindle-weight-of-2-2kw/27001/6 "2026-08-28T17:11:28Z")
@bobblack1 You’re welcome. What are you running now vis-à-vis router/spindle? ---
**Author:** ![aarseneault](https://forum.sienci.com/letter_avatar_proxy/v4/letter/a/9fc29f/32.png) [@aarseneault](https://forum.sienci.com/u/aarseneault)\ **Post date:** [August 28, 2026, 11:31pm UTC](https://forum.sienci.com/t/spindle-weight-of-2-2kw/27001/7 "2026-08-28T23:31:40Z")
I had the Longmill MK1 with the 48’ Extension with a 2.2Kw Spindle and it was able to hold it no problem with no sag. I have since upgraded to Altmill MK2 with the same spindle, but the Longmill worked flawlessly, I just needed the 4x4 space ---
**Author:** ![brewpickles](https://forum.sienci.com/letter_avatar_proxy/v4/letter/b/35a633/32.png) [@brewpickles](https://forum.sienci.com/u/brewpickles)\ **Post date:** [September 4, 2026, 1:49pm UTC](https://forum.sienci.com/t/spindle-weight-of-2-2kw/27001/8 "2026-09-04T13:49:49Z")
I have a 2.2kw air cooled spindle on a 48" MK2 with no issues