Been working on preparing and priming the parts for the Anti-Servo Tabs this week and today tackled the countersinking of the holes on the HS-1220 control horns.
I set my countersink tool on some scrap and off I went no issues on the first horn then onto the second one and on the first hole the sink is too deep for an AN426AD3-3.5 rivet but a 'bigger/fatter' AN426AD4-4 fits a treat and is flush to the surface. I know I'll need to enlarge the rivet hole in the HS 1222 rib to make it fit but my question is it OK to do this?
No idea why the tool over sunk the hole but will proceed with extreme caution when using the sink again.
Couple of photos
http://www.build12.co.uk/albums/Pages/empennage.html#35
http://www.build12.co.uk/albums/Pages/empennage.html#36
I set my countersink tool on some scrap and off I went no issues on the first horn then onto the second one and on the first hole the sink is too deep for an AN426AD3-3.5 rivet but a 'bigger/fatter' AN426AD4-4 fits a treat and is flush to the surface. I know I'll need to enlarge the rivet hole in the HS 1222 rib to make it fit but my question is it OK to do this?
No idea why the tool over sunk the hole but will proceed with extreme caution when using the sink again.
Couple of photos
http://www.build12.co.uk/albums/Pages/empennage.html#35
http://www.build12.co.uk/albums/Pages/empennage.html#36