my first build

[Kn8]

Hi Wires

The root diameter is 7.69mm have a look at; http://www.nookindustries.com/acme/A...Info.cfm?id=15

Regards.

Ivan

[jonm]

hi wires
these ones http://cgi.ebay.co.uk/V-groove-Beari...item3ca85da986

i looked at these be carefull .. could be wrong but i dont think they are accurate enough think they are butcher boy bearings

[irving2008]

Hi Wires

The root diameter is 7.69mm have a look at; http://www.nookindustries.com/acme/A...Info.cfm?id=15

Regards.

Ivan

As an alternative to turning the screw down you could look at these components from dumpterCNC

Note when specifying TR12X3 make sure you say whether its single or 2 start thread - the common one is single start. 2-start is faster (6mm lead) but the components etc are more expensive.

As to the Root Dia, DIN103 spec say max 8.5mm, min 7.68mm depending on fit and load spec. In my experience, generally expect it to be around 7.95mm making it a good fit on 8mm ID bearings.


jonm - I must type faster - Roy's site is a good place to bookmark...

[Swarfing]

Adrian

Something else you can look at is aluminum casting, a furnace is cheap to build and you can get some custom components to suite at the same time? look up charcoal furnaces for cheapness and you will be surprised what can be achieved in your own back garden for less than twenty quid and as much scrap ali you can get your hands on?