Spindle Mount - Adapter Plates

80mm spindle mount and adapter plates for the Sienci Longmill MK2 are very solid, lightweight and milling is nearly perfect. Only downside is the spindle cannot be locked in the mount independently (I believe the middle bolt is too long so it tensions the spindle using the adapter plate, not the front and back parts of the mount) so any adjustment requires retramming. It’s particularly a challenge to tram Y/front-back. The spindle has to be removed/extra hands to hold it in order to loosen the mounting bolts and place wedges.

Very well made and heavy great

Fits great, solid adapter plate. The only thing that could be a little better is that if you have sensors installed you will lose approximately 1/2" of z-axis clearance. If there were a notch in the top plate at the sensor location to maintain the top elevation of the original z axis plate then the full z-height could be maintained. Normally not an issue unless you are using the rotary.

A robust attachment for the spindle. It should allow for accurate cuts with no vibration.

I ordered this at the same time as a PWN CNC 80mm liquid cooled spindle. I have not received the spindle yet so I can’t really give a precise review. It looks solid though!