What is the difference between the theoretical percentage of a thread compared to the percentage of a full thread. When I use the formula tpi*(tap od - drill od/.01299) I come up with a higher percentage than what is on the drill and tap charts.
Why can I not find a H40-DDQNR4 boring bar in any of the tooling catalogs? They have external tool holders in the 17.5 deg orientation "DDQNR" but only 3 deg "DDUNR" for boring bars. Any help would be greatly appreciated.
I am looking for any guidlines or references on bore diameter to length ratios. Our sales dept is having difficulty quoting jobs properly. They take orders for parts that have extreme bore diameter to length ratios. In the manufacturing dept we try to stick with a 3x ratio for steel boring bars...
