# Altmill 4x4 orientatoin of cross beams **URL:** https://forum.sienci.com/t/altmill-4x4-orientatoin-of-cross-beams/26738 **Category:** 🛠️ Assembly **Created:** [July 18, 2026, 8:30pm UTC](https://forum.sienci.com/t/altmill-4x4-orientatoin-of-cross-beams/26738 "2026-07-18T20:30:15Z") **Posts on this page:** 9 **Page:** 1
### Author: ![ArmyDoc](https://forum.sienci.com/letter_avatar_proxy/v4/letter/a/ecb155/32.png) [@ArmyDoc](https://forum.sienci.com/u/ArmyDoc) #### Post date: [July 18, 2026, 8:30pm UTC](https://forum.sienci.com/t/altmill-4x4-orientatoin-of-cross-beams/26738/1 "2026-07-18T20:30:15Z")
Other than not having a smooth front surface, is there any reason not to pit the first crossbar in with the flange facing forward? I want to mount a 2020 extrusion under the first section. T-slot on 2nd beam makes it easy to connect to, but because they only have slots on one side mounting to the first beam is harder. ---
### Author: ![mick\_s](https://forum.sienci.com/user_avatar/forum.sienci.com/mick_s/32/9655_2.png) [@mick\_s](https://forum.sienci.com/u/mick_s) #### Post date: [July 18, 2026, 8:36pm UTC](https://forum.sienci.com/t/altmill-4x4-orientatoin-of-cross-beams/26738/2 "2026-07-18T20:36:53Z")
The legs attach to t-slots that are only in the non-flange face. ---
### Author: ![ArmyDoc](https://forum.sienci.com/letter_avatar_proxy/v4/letter/a/ecb155/32.png) [@ArmyDoc](https://forum.sienci.com/u/ArmyDoc) #### Post date: [July 18, 2026, 8:45pm UTC](https://forum.sienci.com/t/altmill-4x4-orientatoin-of-cross-beams/26738/3 "2026-07-18T20:45:58Z")
Thanks! My kit has been shipped, but hasn’t arrived yet. Going to have to come up with some kind of bracket I guess. Sure wish they had put a t-slot on both sides of the cross-beams. ---
### Author: ![ArmyDoc](https://forum.sienci.com/letter_avatar_proxy/v4/letter/a/ecb155/32.png) [@ArmyDoc](https://forum.sienci.com/u/ArmyDoc) #### Post date: [July 21, 2026, 10:53pm UTC](https://forum.sienci.com/t/altmill-4x4-orientatoin-of-cross-beams/26738/4 "2026-07-21T22:53:52Z")
It’s like they read my mind. Just received my altmill 4x4 and the crossroads now have a t-slot on both sides! ![20260721_181326](https://forum.sienci.com/uploads/default/original/2X/3/32d2c986e6a27503475cf634c432d9cd9d0469d5.jpeg) ---
### Author: ![mick\_s](https://forum.sienci.com/user_avatar/forum.sienci.com/mick_s/32/9655_2.png) [@mick\_s](https://forum.sienci.com/u/mick_s) #### Post date: [July 22, 2026, 2:28am UTC](https://forum.sienci.com/t/altmill-4x4-orientatoin-of-cross-beams/26738/5 "2026-07-22T02:28:29Z")
And underneath also! Handy. ---
### Author: ![Jens](https://forum.sienci.com/letter_avatar_proxy/v4/letter/j/d2c977/32.png) [@Jens](https://forum.sienci.com/u/Jens) #### Post date: [July 22, 2026, 4:29am UTC](https://forum.sienci.com/t/altmill-4x4-orientatoin-of-cross-beams/26738/6 "2026-07-22T04:29:41Z")
The underneath thing is not a T slot. ---
### Author: ![mick\_s](https://forum.sienci.com/user_avatar/forum.sienci.com/mick_s/32/9655_2.png) [@mick\_s](https://forum.sienci.com/u/mick_s) #### Post date: [July 22, 2026, 12:11pm UTC](https://forum.sienci.com/t/altmill-4x4-orientatoin-of-cross-beams/26738/7 "2026-07-22T12:11:54Z")
Yep, I see that now. ---
### Author: ![Altmillal1114](https://forum.sienci.com/letter_avatar_proxy/v4/letter/a/f6c823/32.png) [@Altmillal1114](https://forum.sienci.com/u/Altmillal1114) #### Post date: [July 23, 2026, 10:28am UTC](https://forum.sienci.com/t/altmill-4x4-orientatoin-of-cross-beams/26738/8 "2026-07-23T10:28:37Z")
they should have done same t-track underneath as well. kind of a miss on their part ---
### Author: ![ArmyDoc](https://forum.sienci.com/letter_avatar_proxy/v4/letter/a/ecb155/32.png) [@ArmyDoc](https://forum.sienci.com/u/ArmyDoc) #### Post date: [July 24, 2026, 12:33am UTC](https://forum.sienci.com/t/altmill-4x4-orientatoin-of-cross-beams/26738/9 "2026-07-24T00:33:14Z")
The bottom groove is where the screw goes to connect the cross beam to the rails.