Spindle

Extensions

• ER11 and ER16 extensions

• At ebay price 39 GBP
• 12mm ebay price 15.88 GBP
• 10mm ebay price 13.99 GBP

Collets

• ER11 Collet 3.5mm - 3mm 3-3.5mm ebay
• ER11 collet 1-0.5 ebay
• ER11 collet 1.5-1mm ebay
• ER11 collet 2-1.5mm ebay
• ER11 collet 2.5-2mm ebay
• ER11 Collet 6mm - 5mm 5-6mm ebay

Links

• CNC machine spindle 2005 diy spindle
• Experiments with high speed spindles at http://www.cncathome.com
• DIY high speed spindle thread
• Machine Spindle spindle
• http://www.mycncuk.com/forums/showthread.php/445-DIY-spindle-design/page2
• http://www.bg-cnc.com/wordpress/?p=434
• http://www.cnczone.com/forums/diy-cnc_router_table_machines/10695-spindle_idea-5.html
• http://www.bg-cnc.com/wordpress/?p=705
• http://www.bg-cnc.com/wordpress/?p=316
• http://www.aliexpress.com/fm-store/906970/211040272-465770315/DIY-Engraving-machine-57mm-spindle-fixture.html
• http://www.bg-cnc.com/wordpress/?p=1109
• http://www.homemodelenginemachinist.com/index.php?topic=13822.0

I scratch built a medium duty CNC router for a friend of mine.  I went with the Kress router head.  
Do not underestimate the capability of this unit, it has good power, stiffness and the one I used had only 2 microns of runout.  
It can cut metal pretty well.  The only downside is that it doesn't do well much below 10,000 RPM.  
I like the look of the Arc Euro Trade spindles (and the Japanese VFD they sell with them) and would likely go with them if I did it again.  
More expensive, but heavier duty again and they use ER collets - much more versatile.

• http://www.arceurotrade.co.uk/Catalogue/High-Speed-Spindles-Motors-Inverters