Excellent info!!! And makes perfect sense. Dan Heath also brought up a good point. Using a buraway tool is an art. If you press too hard or run your drill too fast then you make the hole bigger. Gentle pressure and low rpm is the key to a buraway
Rachel
Perfect #30 holes when dimpling
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A forum for Panther aircraft builders and Enthusiasts. Two simple rules: Play nice and use a real name
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rlweseman
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Tony Spicer
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Perfect #30 holes when dimpling
There's been considerable discussion on the builders group about the best way to end up with a hole that's close to #30 in size after the dimple has been formed. Some drill #30 then dimple. Others drill #31, then dimple. In both cases, the hole ends up being oversize. There is a belief that oversize holes contribute to proud stems when the rivet is set. Personally, I drill #30 then dimple and have had no issues with proud stems.
At one time Cleaveland Aircraft Tool had a die designed for 120 deg, 1/8" dia rivets. What's unusual about the die is the pilot is 3/32". Drill a #40 hole, dimple, then drill #30. Result is a perfect #30 hole every time. No more steps from start to finish, just a shuffling of the order.
Problem is Cleaveland has been out of stock for about six months. Mike Lauriston at Cleaveland told me there will be a production run starting this week, and that they should have dies in a week or two. Part number is DIENQ.
Tony
At one time Cleaveland Aircraft Tool had a die designed for 120 deg, 1/8" dia rivets. What's unusual about the die is the pilot is 3/32". Drill a #40 hole, dimple, then drill #30. Result is a perfect #30 hole every time. No more steps from start to finish, just a shuffling of the order.
Problem is Cleaveland has been out of stock for about six months. Mike Lauriston at Cleaveland told me there will be a production run starting this week, and that they should have dies in a week or two. Part number is DIENQ.
Tony