Table size to account for ATC racks?

Altmillal1114 · February 21, 2026, 12:24pm

Putting my altmill mk2 together and have ATC with racks on preorder. Does anyone know what I should make my table size front to back to make sure ATC Racks fit? Currently its little under 49” but I can make it shorter now instead of later when ATC Kit arrives

KGN · February 21, 2026, 1:08pm

Hey, so I can double check with the engineers on Monday because this is an in-progress knowledge base, but taking a quick peak at our resources for the ATC, the travel changes are as follows:

github.com/Sienci-Labs/Resources

atc/atc-basics/atc-specifications.md

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## What's Included

In each ATC Spindle Kit, you will receive:

This file has been truncated. show original

Reduction in Machine Travel (Y-axis):
5.3" from the back of the machine, accounting for clearance for the Clear Cut Dust Shoe.

Remaining Machine Travel (Y-axis):

2×4: 20.3"
4×4: 43.5"
4×8: 99"

Altmillal1114 · February 21, 2026, 3:39pm

I have about 200mm from the back crossbeam to the mdf table. Specs don’t list the mdf base layer size with ATC racks installed. Thats what i’m looking for

NewsVan · February 21, 2026, 5:42pm

I was watching some videos on the ATC and decided I was going to make my table top sit flush with the aluminum crossbeam that sits closest to the end of the frame (second last cross beam looking from the front of the machine). Based on the communication provided so far I think you can technically eke out a few extra millimeters but that was a nice satisfying, repeatable, and future proof spot to stop.

I can’t wait for the ATCs to start shipping.

Altmillal1114 · February 21, 2026, 6:33pm

Hard to tell from videos but I think that is the safest option to go with. So your mdf table is flush with the back of the 2nd to last crossbeam?

NewsVan · February 21, 2026, 10:45pm

You got it. I did the assembly as written in the resources, so the flange on that crossbeam faces the back of the machine, and my table top and wasteboard come flush up to the back edge of that flange.

Altmillal1114 · February 22, 2026, 12:52am

I made mine 48” hopefully it’s enough. Your option came out to be little less then 45”

Altmillal1114 · March 1, 2026, 11:16pm

Looks like ATC stuff got published on github and looking at it, last 2 crossbeams need to be fully exposed so if my math is correct the mdf base table should be about 41”? @KGN is that correct?