spindle cross section view

[routercnc]

Some time earlier this year I was searching the internet for spindle drawings, prior to purchasing a ready made unit, just to see how they were made. Maybe I was looking in the wrong place as initially I didn't find much, but eventually I found this - might be helpful for those looking to make their own.

It's in Chinese, but the bits your can read suggest:
220v, 400Hz, 3.7Kw, 12.9A, (fairly powerful then), 24000rpm, 0.003mm spindle runout, 16mm collet (?) with 0.02mm runout (? not sure), and some figures which might be bearing preload (190+-10N and 150+-10N). Please correct me if I'm wrong!

You can see opposing pairs of angular contacts top and bottom, the motor in the centre, and what is likely to be water channels around the outside leading to the lower pair of bearings. Top cap appears to have the power supply, and the in/out water feeds.