CTI-USA · Gear Hobbing Cycle-Time Estimator

Estimate the hobbing cycle time for a spur or helical gear (also splines, sprockets and worms cut by hobbing) on a CNC or conventional hobber. Pick the exact work material and condition and the CTI hob steel; cutting speed comes from CTI-USA's gear-materials matrix and each pass is timed separately. Then request a detailed report and a quote.

Units

Diametral pitch (DP)

Number of teeth (Z)

Face width (in)

Helix angle (deg, 0 = spur)

Hob outside dia. (in)

Hob starts

Hob steel (coated)

Machine

Speed setting

Cut strategy

Workpiece material & condition (from CTI's gear-materials matrix)

Advanced: machine & pass settings (optional — defaults are typical for a modern CNC hobber; leave blank for auto)

Approach A (in)

Overtravel O (in)

Finish stock left by roughing (in, radial)

Roughing feed f_r (in / work rev)

Finishing feed f_f (in / work rev)

Finish-pass speed factor (× roughing rpm)

Max hob spindle speed (rpm)

Rapid traverse V_rapid (in/min)

Rapid clearance each end (in)

Radial infeed rate F_radial (in/min)

Sync / index time t_sync (min)

Dwell total (min)

Hob shift per part L_shift (in)

Hob shift rate V_shift (in/min)

Shift settle t_settle (min)

Load / unload (min per piece)

Utilization E (%)

Method: each pass T = (W + A + O) × Z ÷ (f × hob rpm × starts); passes are summed, then rapid, radial infeed, sync, hob shift and dwell are added.

Estimated hobbing cycle

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Floor-to-floor / pc

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Cutting time / pc

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Est. pcs / hour

Cutting passes

Cycle-time budget

Calculation basis

Planning estimate for conventional axial hobbing. Cutting speeds come from CTI-USA's Common Gear Materials & Tool-Steel SFM matrix (work material × hob steel), a conservative starting range to be proven out by tool-wear inspection. Each cutting pass is timed from its own travel, feed and hob speed, then rapid, radial-infeed, synchronization, hob-shift and dwell time are added. Actual time depends on the machine, fixture, coolant and hob condition. Request the full report below for a documented breakdown and a firm quote.

Get the full report & a quote

Your detailed PDF report downloads immediately, and a CTI-USA engineer follows up by email with tooling recommendations and pricing. No obligation.

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