Mill Upgrades – Spindle Motor – Part 2

Running into many more roadblocks than expected on this. I missed some critical factors when planning the installation of the original motor and as such had to recut the motor mounting plates (which required reinstalling the original motor and all the head gearing), and I’ve been distracted by working on the air compressor.

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I finally got around to testing the upgrade VFD, only to discover that it’s throwing a ‘low DC bus voltage’ error, which probably means something inside is not working right. I couldn’t get it working again and a replacement is $1k (I paid much less for mine on Ebay, but there don’t seem to be any floating around there now). I confirmed the motor worked with my Huanyang VFD, but I don’t trust one of those enough to make it permanent. Also, the cast iron motor I have is crazy heavy (100 lbs), so both for ease of installation and Z-axis acceleration a lighter motor is a plus.

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I went out and bought a used Baldor EM3610T (3 HP, two pole, 240V, steel banded case) on Ebay, and had to wait a few days to find out which face mounting kit was correct (according to Baldor, the 35-1325GLD, the 35-1325 will work too but the color doesn’t match). Finding C-face kits can be a pain and I strongly suggest you buy a motor which is sold with it already installed, like the CEM3610T.

I also bought an LS (formerly LG) VFD from Wolf Automation. There are a lot of good options for cheap single-phase drives in this horsepower range, including Fuji and Delta.

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The motor and VFD have been tested and are working, just waiting on the face mount to show up. The VFD is currently running the original 1.5 HP motor. Once the new face mount shows up it’ll be time to pull the head back apart and mount the new motor.

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