Tapping Calculator
Creation date: 6/5/2025 1:52 PM
Updated: 6/6/2025 3:16 PM
The tapping calculator is a tool built into the machine to assist the operator in calculating the tapping speeds needed to program the end working or auxiliary spindles. The values entered into the calculator have no impact on the job. There are 8 fields that must be filled in for the tapping calculator to display the required spindle speeds.
1) Threads per inch: The thread count of the thread to be cut.
2) Work Time: The programmed cycle time of the part to be tapped. This value can be found on the left side of the "Job Setup - Page 1 - Primary Setup" page.
3) Cam rise: The built-in rise of the end working cam of the spindle that will be tapping. This value does not include the "rapid" part of the cam. If this value is unknown, then contact Davenport support to look up the cam drawing (Cam number required).
4) Cam Drop: The built-in drop of the end working cam of the spindle that will be tapping. This value does not include the "rapid" part of the cam. If this value is unknown, then contact Davenport support to look up the cam drawing. Typically, this value is the same as the Cam Rise (Cam number required).
5) Cam 100's In: The built-in duration of the feed in of the tapping cam. This value does not include the "rapid" part of the cam. If this value is unknown, jog the machine through a cycle and take note of the cam hundredths when the cam starts feeding in and when it stops. The difference in the cam hundredths is the "Cam 100's In". If the value is still unknown, contact Davenport support to look up the cam drawing (Cam number required).
6) Cam 100's Out: The built-in duration of the feed out of the tapping cam. This value does not include the "rapid" part of the cam. If this value is unknown, jog the machine through a cycle and take note of the cam hundredths when the cam starts feeding out and when it starts rapiding out. The difference in the cam hundredths is the "Cam 100's Out". If the value is still unknown, contact Davenport support to look up the cam drawing (Cam number required).
7)Pullout: How much the tap pulls out of the holder when in a floating tap collet.
8)Cam 100's Work: This value is the cam hundredths between the "Work Position" and the "Index Position". Both of these values can be found on the left side of the "Job Setup - Page 1 - Primary Setup" page. Typically, the "Work Position" is set to 99.99 cam hundredths and the "Index Position" is set to 50 cam hundredths, so typically the "Cam 100's Work" is 50.