Work schedule for a spur gear: from raw part to main time (3D)
About this app
Five steps to the work schedule of a spur gear: check drawing and roughness, add allowances and pick the standard bar (Ø 95 × 38, part number 394), order nine operations from cutting to grinding and watch them in 3D, assign cost centre and lathe, and determine the main time th = L·i·π·D/(1000·vc·f) with a real-time turning simulation. The schedule builds up live; plus the group exercise with checking.
With explain mode: an AI tutor walks you through the app, points out what matters in the scene and answers your questions.
Work schedule and main time
A work schedule defines from which raw part a part is made, in which operations, on which machines and in what time. It is created in five steps: document review, raw material specification, sequence of operations, allocation of resources and determination of time. The raw part is the finished size plus allowances, rounded up to a standard diameter. The main utilisation time in longitudinal turning is th = L · i · π · D / (1000 · vc · f), with length L, number of cuts i, diameter D, cutting speed vc and feed f.
What the app shows
The spur gear from the lecture with a tip diameter of 85 mm and a width of 35 mm, made of 50 CrV 4. With allowances z1 = 4 mm and z2 = 3 mm this gives D = 89 mm and L = 38 mm; the next standard diameter is a Ø 95 round bar with part number 394. A 3D section shows finished part, allowance and surplus. Nine operations from cutting through rough turning, hobbing and hardening to grinding run in 3D, and the work schedule fills up row by row with cost centre and machine.
What you try out
Pick the right row in the allowance table and the bar diameter, order the operations and assign cost centre and lathe. In the last step you set cutting speed, feed and depth of cut and start the turning simulation; the clock runs with the real main time. At 280 m/min and 0.5 mm feed it takes 4.86 s, at 160 m/min, 0.2 mm and two cuts 42.5 s. A bar puts the 55 min setup time next to it. A group exercise with a second gear checks your entries.
Frequently asked questions
- How do you calculate the main time in turning?
- For longitudinal turning, th = L · i · π · D / (1000 · vc · f), with turning length L in mm, number of cuts i, diameter D in mm, cutting speed vc in m/min and feed f in mm. Example: 38 · 1 · π · 95 / (1000 · 280 · 0.5) = 0.081 min, about 4.86 s.
- How do you determine the raw part for a turned part?
- Add machining allowances for diameter and length to the finished size, in the example z1 = 4 mm and z2 = 3 mm: Ø 85 × 35 becomes D = 89 mm and L = 38 mm. Then round the diameter up to the next available bar, here a Ø 95 round bar.
- What does a work schedule contain?
- Header data such as part, raw part and part number, one row per operation with number, description, cost centre, equipment, setup time and time per unit, plus administrative data. The schedule is created once per part; production control then uses it for every order.
- How does the “Work schedule for a spur gear” app work?
- You go through the five steps of work planning, make a choice in each step and get a reason back. The work schedule builds up live; the turning simulation shows the main time in real time, while chips and rotation in the picture are slowed down.
Subject: Industrial Engineering
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