Engineering

Machining Time Estimator

Turn feed, speed and setup into a cycle time and a batch time, and show how much of the batch is the setup rather than the cutting.

The cut

Number of passesOne pass is one continuous cut.Cutting length per pass (mm)Feed per revolution (mm/rev)From the tool catalogue for this material and cutter.Spindle speed (rpm)From the tool catalogue - surface speed divided by diameter.Rapid / indexing per pass (s)Non-cutting travel.

The batch

Tool changes in the cycleSeconds per tool changeSetup (minutes)One-off for the batch, not per part.Quantity

Result

4m 9s per part

Cycle time at 288 mm/min feed rate. The batch of 250 runs 1082m 30s including setup.

Feed rate288 mm/min

Cut per pass25.0s

Cycle time per part4m 9s

Machine hours per part (cycle only)0.0692

Batch time (250 pcs)1082m 30s

Setup share of the batch4%

Reading the number

Feed rate 288 mm/min is 0.12 mm per revolution at 2400 rpm. That is the number the cut is actually made at - everything else follows from it.
Setup is 4% of this batch, so the price is essentially the cycle time times the quantity. This is the volume at which cutting a minute off the cycle is worth more than shaving the setup.
3 tool changes at 25s each is 75.0s of the cycle. Reducing the number of tools a part needs is a design decision with a time cost attached.
Machine time only. It excludes programming, inspection, deburring, finishing and packing, all of which a quote carries separately.

Arithmetic on the feed, speed, length and setup you enter. It does not recommend cutting parameters and it is not a quotation - machine time is one line of a price, not the price.

What you provide

Passes and cutting length
Feed per revolution
Spindle speed
Rapid and tool change time
Setup minutes
Quantity