Ok so I'll get right to it.
Not happy with these marks at all. If deburring is to reduce stress that could form a crack these marks can't be helping. Im a new builder. This was done with a standard 3 flute countersink cutter that has come with most of our tool kits. I do have mine attached to a low RPM cordless screwdriver. While using it i only use the weight of the tool it self as I'm worried about over doing it.1 rpm per hole. (I have a timing mark on the cutter). While I do have a Zero flute cutter on the way I just wanna ask you guys if you think this is still Airworthy.
Thoughts?
![](/community/proxy.php?image=http%3A%2F%2Fs6.postimg.org%2F8ibtyfr31%2FIMG_6387.jpg&hash=0261829ec70a3e07d8e4de985743b98b)
Not happy with these marks at all. If deburring is to reduce stress that could form a crack these marks can't be helping. Im a new builder. This was done with a standard 3 flute countersink cutter that has come with most of our tool kits. I do have mine attached to a low RPM cordless screwdriver. While using it i only use the weight of the tool it self as I'm worried about over doing it.1 rpm per hole. (I have a timing mark on the cutter). While I do have a Zero flute cutter on the way I just wanna ask you guys if you think this is still Airworthy.
Thoughts?
![](/community/proxy.php?image=http%3A%2F%2Fs6.postimg.org%2F7snzoyk7x%2FIMG_6385.jpg&hash=e2d3a03f99a912977fa619e93e59a6ca)
![](/community/proxy.php?image=http%3A%2F%2Fs6.postimg.org%2Fy2e44vcgt%2FIMG_6386.jpg&hash=69c65eeaa77e41daaca8d3456f83e657)
![](/community/proxy.php?image=http%3A%2F%2Fs6.postimg.org%2F8ibtyfr31%2FIMG_6387.jpg&hash=0261829ec70a3e07d8e4de985743b98b)