I've been researching spindles for the 1000x1000 workbee mechanical kit, and I've found a lot of people use Chinese 1.5kw motors. ER11 collets seem to be the most common available to buy and I've not been able to find a reasonably priced ER16 version of the square shaped spindle motor. Here are the two deals I'm torn between: 1.5kw Air Cooled ER16 (with VFD) - £181.95 1.5kw Air Cooled ER11 (square shape with VFD) - £229.79 Which of those would you choose, or would you got for another option? I like the idea of the square spindle mount, as it provides additional cooling and stability... however the cheaper option is ER16, but I'd need to source a separate mount.
Just another quick question - it looks like the 1.5kw ER11 spindles are 65mm and weigh 3.5kg. The 1.5kw ER16 spindles are 80mm and weigh 5.5kg. Would the latter be too heavy for a workbee build? I've been offered an ER16 for the same price as the ER11... but I don't know if it'll be too heavy.
Do you know how big of end mill or router bit you will ever use. Here's a chart shows the sizes. ER Collet Sizes - LittleMachineShop.com Just maybe figure out the biggest bit you need that might help on what spindle to get. If you believe you will never go bigger then 1/4in or 6.35mm shank then no reason for ER16. The other problem is if the spindle weight is to heavy for the stepper it will droop or move on its own. Just from what I have read from other posts who have too heavy of a spindle.
