I am verey pleased with the Upgrade kit. Finally the mill has the right power to do serious projects adquate to the mill construction.
I only have one serious remark about the kit:
All touchable parts of an electrical appliance must be safe of getting in contact with AC high voltage (220V), no matter if the are hooked up to the grid or not.
Simply posting a safety note into the instructions will not qualify electrical safety standards here in Europe.
Please change the connector socket ( the one that connects to the spindle motor) on the relay control unit to a female version!!
This will prevent shock hazard when one touches the connector pins hat carry 220 V grid voltage without spindle cable being attached.
Aditionally the metal body of the spindle has to be conected to the protective ground conductor unless it's fully shielded with a plastic housing.
Neglecting these measures might get you in BIG TROUBLE with liability claims in case of an electrical shock accident causing serious health damage or death!!
Electrical appliances here in Europe MUST meet these standards outherwise they will not be approved for sale!!.
Since I am a trained person, I can live with the current risk hazard, but bear in mind that the main target customers for this product are untrained hobbyists,
and a short unthougtful moment could lead to serious accidents!