Uploaded April 2026 | Updated September 2026, 3 weeks ago

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In this step you’re installing a 1.5kW or 2.2kW ER20 spindle. An ATC spindle requires a slightly different set up: resources.sienci.com/view/atc-spindle-setup

***This video focuses on setting up a Sienci Labs’ ER20 spindle on a brand new 4x8. Slightly different steps are required for setting up an ATC.***

Tip: Use Z-axis packaging to prevent the spindle from falling out the spindle mount while setting the height.

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Extra Help
ATC Spindle Set Up
youtu.be/Y2mevczdZ8M

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Next Step: "Drag Chains & Wiring"
youtu.be/5YyUr21vLzA

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Learn more
Videos act as overviews for the assembly process, and were built to supplement online instructions. Be sure to watch this video AND read any appropriate online instructions. A parts list for your AltMill 4x8 will be online too.

AltMill 4x8 Assembly Help: bit.ly/41yb2Si
AltMill 4x8 Product Page: bit.ly/3PwRv25
gSender CNC Interface Software: bit.ly/4bFUgXl

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