Small spindle head

[BillTodd]

And whilst I am planning to loctite rear bearing, I don't think I will need it for the front one.

The rear bearing should float (or at least not be too tight) to avoid stress from thermal expansion differences between spindle and casing.

BTW interesting article on Bob Warfield's site about using standard deep groove bearing in a spindle:(scroll down a bit)
http://www.cnccookbook.com/CCMillBeltDrive.html

[edit]

And this is from a bearing expert:
[ame="http://www.practicalmachinist.com/vb/showpost.php?p=1065036&postcount=4"]Practical Machinist - Largest Manufacturing Technology Forum on the Web - View Single Post - Tapered roller vs angular contact ball bearings[/ame]

[ame="http://www.practicalmachinist.com/vb/showpost.php?p=1065158&postcount=10"]Practical Machinist - Largest Manufacturing Technology Forum on the Web - View Single Post - Tapered roller vs angular contact ball bearings[/ame]

[bambuko]

The rear bearing should float ...

That was my original plan and I have turned the housing with sliding fit for the rear bearing (as opposed to front one, which is interference fit).
I was considering using Loctite on rear bearing after assy to keep things "solid" as I didn't expect the spindle to heat appreciably at my target max 5k rpm. But I am probably running in circles, changing my ideas every five minutes - so I will stick with original idea (rear bearing floating) and see how it works.

...BTW interesting article on Bob Warfield's site about using standard deep groove bearing in a spindle:(scroll down a bit)
http://www.cnccookbook.com/CCMillBeltDrive.html...

Yes, this is in my favourites,

...And this is from a bearing expert:
Practical Machinist - Largest Manufacturing Technology Forum on the Web - View Single Post - Tapered roller vs angular contact ball bearings

Practical Machinist - Largest Manufacturing Technology Forum on the Web - View Single Post - Tapered roller vs angular contact ball bearings

Thanks for the links!