[ARC5] Arc-5 screw removal

[Brian Clarke]

Interesting theory. But, ...
  a.. the sheared off screw will not have left a flat plane normal to the direction of the screw
  b.. brass is harder than aluminium, especially at the fracture face
  c.. the pressure required to make a dent in brass is beyond what Joe Average will achieve with a Spiral push drill
  d.. push harder to make a dent in the brass and you'll either break the drill bit or wander into the soft aluminium
73 de Brian, VK2GCE.

Roy hypothesised on Monday, March 12, 2012 4:36 PM:


 
> Clock repair people have for a long time used little hand operated  
> drill holders - the size of a medium "jewelers screwdriver" that has a  
> spiral body and a little collar you move up and down.  Called a Spiral  
> Push Drill.  Here is one:
> 
> <http://jewelerssupplies.com/shop-bin/sc/productsearch.cgi?storeid=*1c8926f480018ed5e14647abdcbcd4c4 
> 
> I think that for the size of the Arc-5 screws, and especially the  
> brass ones, this little tool would do the job with little danger,  
> nearly no noise, and very low investment.  Ultra precision is not  
> needed when drilling out a small broken screw.
> 
> Roy
> 
> Roy Morgan
> k1lky at earthlink.net
> K1LKY Since 1958 - Keep 'em Glowing!