Drilling through a nose sprocket?

[Daniël Bos]

Just wondered, what kind of bearing there is in the nose sprocket of a bar?

I've been attempting to make a mill and wondered if it would be possible to drill a single hole through the centre of the nose sprocket of a 36" stihl rollomatic to gain 2" of cut?

 

I've never taken a nose apart but there must be someone who has?

 

The rivets in the centre look like they form a circle easily big enough to make a hole for a single bolt?

 

Thanks, daniel.

[bobh]

I think I have seen this done before, mainly in the U.S. if I remember right. Not sure how safe it is though, sure someone else will be along with some better info.

[amfell]

the bearing is made up of little rollers

 

be warned the steel that the guidebar is made from is very hard

and will blunt a new drill bit in seconds

[Rob D]

the bearing is made up of little rollers

 

be warned the steel that the guidebar is made from is very hard

and will blunt a new drill bit in seconds

 

 

Sorry but that's not true - it's pretty easy drilling a bar with a good quality drill bit.

 

[ame=http://www.youtube.com/watch?v=eqo6tyJIUoo&list=UU9K0KfLNH84tuWi2VjlSlCg&index=4&feature=plcp]chainsawbars.co.uk - how to drill bar for Granberg auxillary oiler G801A - YouTube[/ame]

 

 

If you really need those extra 2" I'd be tempted to go for a solid nose bar and additional oiler.... I've not tried drilling through the sprocket but I'd say prob would not work and you'd damage the sprocket... could be wrong though!