Calculating Time of a Peck Drilling Cycle on Milling Machine
Calculating Time of a Peck Drilling Cycle on Milling Machine
(OP)
I am looking for a formula to calculate the time of a peck drilling cycle. I have several deep holes to drill in a job I am quoting. I am looking for a formula that I can enter in these variables: hole depth, peck size, drilling feed rate, Rapid feed rate, clearance amount. This cycle retracts from the hole after every peck, and returns to the "clearance amount" at bottom of hole.
Example of variables:
Hole Depth: 25"
Peck Size: .125"
Drill Feed Rate: 3 Inches Per Minute
Rapid Feed Rate: 150 Inches Per Minute
Clearance Amount: .020"
See attached picture for clarification of cycle.
Example of variables:
Hole Depth: 25"
Peck Size: .125"
Drill Feed Rate: 3 Inches Per Minute
Rapid Feed Rate: 150 Inches Per Minute
Clearance Amount: .020"
See attached picture for clarification of cycle.





RE: Calculating Time of a Peck Drilling Cycle on Milling Machine
It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.
RE: Calculating Time of a Peck Drilling Cycle on Milling Machine
RE: Calculating Time of a Peck Drilling Cycle on Milling Machine
So 201 pecks with a total feed distance of 25.020 inches, multiplied by your feedrate. Then, you will be rapiding between 0.020 and -25.000, so take the average of those 2 values (12.510 inches) and multiply by the number of pecks, divide by the rapid rate, and that will equal your total rapid time.
You can easily put together a spreadsheet in excel to plug in your variables and arrive at an answer.
It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.
RE: Calculating Time of a Peck Drilling Cycle on Milling Machine
It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.