My DIY high speed spindle, Used parts:
ER 11 1/2" straight shank collet chuck 120mm long, stainless housing, selfmade labyrinth + silicon seal), two high precision angular bearings (nether side) -><-, upper bearing floating type mounted (spring insures preload), then diy star type flexible coupling and then Kontronik Tango 45-13, Upper side of housing is made from aluminum, Tango fixed between six rubber strips for reduce noice and vibration. Then common RC brushless speed control (I use Schulze), 24V comes from AEG Stepping power unit, common current 2...3A when up to 3 mm endmill, 5...8A when up to 7mm endmill and heavy cut cycle. rpm regulated via rc servo tester (6v via step down regulator). Max RPM ca 30.000. Most of all I use 1,6mm two flute carbide endmills for cut parts from 4, 5 and 6 mm 7075 alu plate (full speed!) I have correct cooling system with pump. Carbon fiber plate and glass fiber I gut with "zig-zag" carbide endmills 0.7 ...3,18 mm without any cooling.
I have large enough servo system cnc gantry mill (x-1000mm, y-400mm, Z-200mm, Hiwin rails and, ballscrews) - DIY - most of info I have got from CNC-zone, just readed lot of threads with not any comments or questions from my side (my English is "wooden" , its selfmade as well ;-)
If any interest about my milling stuff - please let me know - will add or send photos and perhaps can help with advices.
Regards,
Herbert Kabi,
khabe@hot.ee
PS:
I have several HF spindles too, included one older very-used KaVo, have rented out to friends - I never use myself anymore - my selfmade spindle is the best.