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Industrial engineers have to calculate the taken by machine elements using formula applicable. Then they have to make adjustments to the machine elements so that variables can be changed to decrease machining cutting time.
Work measurement professionals have to focus on machine time estimation also. Also, they have to focus on developing productivity science based on measurements that they are taking. My comment in work measurement Linkedin group.
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N = [1000×V]/[π ×D]
N = RPM
V = Cutting Speed
D = Dia of the cutter
Time for one cut Tm = [Total table travel]/[Table feed/min]
Where, Total table travel = Length of job + Added table travel
Table feed/min = Feed/tooth × Number of teeth × rpm
The approach is the distance the cutter must be engaged before the full depth of cut is reached.
(a) When cutter diameter is less than the width of the work.
Approach = 0.5 d
Example
Find the time required to face a job 25 cm long and 10 cm wide with the help of milling cutter of 10 cm dia, having 8 teeth and revolving at 80 rpm. The feed per tooth should not exceed 0.125 mm. The width of cutter is sufficient to mill to whole of job at a time.
Solution
Length = Length + Approach + Over travel
= l + A + (1/2)*[D - SQRT(D square - b square)]
= 250 + 20 + (1/2)*[100 - SQRT(100 square - 100 square)]
= 320
Tm = L/[f×N×T]
= 320/[0.125× 8× 80]
= 3.56 min.
Mitsibishi - Formulas for Face Milling
http://www.mitsubishicarbide.com/en/technical_information/tec_rotating_tools/face_mills/tec_milling_formula/tec_milling_formula
Sandvik Coromant - Milling formulas
https://www.sandvik.coromant.com/en-gb/knowledge/machining-formulas-definitions/pages/milling.aspx
Estimating Machining Time for Turning
https://nraoiekc.blogspot.com/2014/04/estimating-machining-time-for-turning.html
Updated on 29 May 2020, 12 November 2019
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Milling & Turning | 40 years in Australian Manufacturing of Sorensen Engineering
ReplyDeleteSorensen Engineering specialize in manufacturing high quality Milling & Turning, competitively priced components and products for a range of industries. Proudly Australian, we have been manufacturing for over 40 years supplying the biomedical, automotive, film, heavy industry,& architectural, transport and building sectors.
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