Uploaded April 2026 | Updated September 2026, 2 weeks ago

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In this step you're mounting an ATC Spindle on an existing AltMill 2x4, 4x4 OR a new AltMill, same sizes.

Regardless of machine size - 2x4/4x4 - the mounting process is the same, HOWEVER, it's particular if you're putting an ATC onto a new machine or on an upgrade path.

Mounting on a 4x8?
youtu.be/GvSc3w4SsZQ

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Next Step: VFD Install
youtu.be/cG_Ziu_uB1U

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Extra Help

Spindle Set Up:
resources.sienci.com/view/atc-spindle-setup

Mounting Plate Configurations:
resources.sienci.com/view/atc-spindle-setup/#mount-the-spindle

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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 ATC will be online too.

ATC Overview & Specs: bit.ly/4bQpCL7
ATC Unboxing: bit.ly/3QIgdNc
FREE CNC Interface Software: bit.ly/4v010qH
ATC Product Page: bit.ly/4ebyKvp

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