How to Calculate Machine Requirement for Sewing Operations in an Assembly Line?

SHARE:

You may often to need estimate machine requirement calculation. In this post I have discussed the steps to estimate how many machines and what types of machines you need to make your garment in an assembly line. The primary information you need for calculating number of machines -

A. Daily production target – it means how many pieces you want to stitch per day.

B. Number of hours in a shift – How many hours you plan to work each day

C. SMV of each operation – Standard minutes for each operation

D. Present efficiency of the factory (in case you don’t aware about present factory efficiency, use 50% efficiency). Efficiency is required because production will depends on how efficiently workers may do their job.

Step 1: Operation breakdown 
Select a garment for which you want to calculate machine requirement. Analysis the operations required to sew the garment and list down operations in a spread sheet in a sequence. For example, see operation break down of a Crew neck Tee in following table.

Step 2: Identify machine type 
Observe what stitch class has been used in the operations and according to those select machines against each operation.

Step 3: SMV of each operation
Write down SMV or standard minutes at right column of machine type. SMV is the most important part for calculating machine requirement. You can use SAM of each operation from your database. If you don’t have database for standard minutes then calculate it. Read the article how to calculate SAM of a garment.

Step 4: Calculate Theoretical machine requirement 
Set your production target for the day (8 hours shift). Example- 400 pieces per line. Use present efficiency level of the factory. And now,  calculate machine requirement using the following formula. It is called as calculated machine number. Because formula gives you fraction of machine but in real you can’t able to use fraction of machine.

               = (Target quantity in pieces* individual operation SMV)/(8 hrs*60 minutes*desired efficiency)
               = (A*C)/(B*60*D)
             
Step 5: Physical machine requirement 
Now simply round off the machine number. Or you can club operations those use similar machine class. To do operation "Serge margin" half machine is required and the operation "sew side seam with label" required 1.4 machines. So can use first 4TOL machine to do the second job. Hence you can reduce the machine number and increase machine utilization.

Example: Operation bulletin for Tee Shirt (Crew Neck)

 Production target/day
 (8 hours) =400 pieces
Shift hours = 8 hours
or 480 minutes
Plan on  Efficiency
=50%
Opr.
No.
Description
Machine
Type
SMV
No. of Calculated M/c
Round-off
Machine No.
1
Make Neck Rib & Runstitch
SNLS
0.55
0.9
1
2
Join shoulders
4TOL
0.45
0.8
1
3
Insert Neck Rib
SNLS
0.45
0.8
1
4
Serge Margin
4TOL
0.31
0.5
1
5
Top stitch on Neck rib
3TFL
0.34
0.6
1
6
Attach Sleeve
4TOL
0.78
1.3
1
7
sew side seam with labels
4TOL
0.84
1.4
1
8
Hem sleeves
3TFL
0.68
1.1
1
9
Bottom Hem
3TFL
0.56
0.9
1

TOTAL

4.96
8.27
9

Machine requirement Summary:
Single Needle Lock Stitch (SNLS): 2 No.
Four thread Over lock machine (4TOL): 4 No.
Three thread Flat lock machine (3TFL): 3 No.

Related Topics:

[post_ads_2]

COMMENTS

You may also like

Name

5S,3,apparel industry,56,apparel news,33,Apparel Production,30,Apparel Software,15,Bamboo Fabric,1,Bangladesh,1,Blogs,1,Books,30,Business Guides,9,Buyer,1,Buying House,4,CAD/CAM,1,Calculation & Formula,1,career,33,Change Management,1,Clothing,1,Clothing Brand,3,Compliance,3,Consumption,4,Costing,7,Cutting,17,Denim,3,Directory,2,Dyeing,1,eCommerce,1,Education,5,Event & Fair,14,Fabric,70,Fashion,5,Fashion Business,36,Fashion Design,3,Fashion Show,1,Fiber,1,Finishing,10,Garment Exporters,1,Garmenting,1,Gartex,1,Guest Post,8,Human Resource,2,Industrial Engineering,208,Infographic,5,Knitting,3,Kurti,1,Lean,27,Line layout,3,Machines,28,Manufacturing,51,Merchandising,101,MIS,23,MISC,20,Operation bulletin,14,Operator,1,Performance rating,1,PLM,2,Printing & Embroidery,11,Problem Solving,1,Production Planning,26,Project Report,1,QNA,120,Quality,61,Quality manual,2,Quality system,14,Resources,42,Retailing,3,Salary & Wages,7,Sampling,22,Scheduling,3,Sourcing,8,Spec Sheet,9,Sportswear,1,Stitching,3,Store,2,Stretch fabric,1,sustainable clothing,7,T-shirt,3,Tailor,1,Tailoring Shop,2,Technology,56,Texprocess,1,Textile processing,11,Textile testing,21,Textiles,41,Threads,1,Towel,1,Trims & Accessories,15,videos,11,Waste,1,Work Study,38,Yoga wear,1,
ltr
item
Online Clothing Study: How to Calculate Machine Requirement for Sewing Operations in an Assembly Line?
How to Calculate Machine Requirement for Sewing Operations in an Assembly Line?
Method of calculating machine requirement for stitching operations in the garment industry.
Online Clothing Study
http://www.onlineclothingstudy.com/2011/10/how-to-calculate-machine-requirement.html
http://www.onlineclothingstudy.com/
http://www.onlineclothingstudy.com/
http://www.onlineclothingstudy.com/2011/10/how-to-calculate-machine-requirement.html
true
6551124471002606808
UTF-8
Loaded All Posts Not found any posts VIEW ALL Readmore Reply Cancel reply Delete By Home PAGES POSTS View All RECOMMENDED FOR YOU LABEL ARCHIVE SEARCH ALL POSTS Not found any post match with your request Back Home Sunday Monday Tuesday Wednesday Thursday Friday Saturday Sun Mon Tue Wed Thu Fri Sat January February March April May June July August September October November December Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec just now 1 minute ago $$1$$ minutes ago 1 hour ago $$1$$ hours ago Yesterday $$1$$ days ago $$1$$ weeks ago more than 5 weeks ago Followers Follow THIS CONTENT IS PREMIUM Please share to unlock Copy All Code Select All Code All codes were copied to your clipboard Can not copy the codes / texts, please press [CTRL]+[C] (or CMD+C with Mac) to copy