IMTMA Training Centre

Tolerance Stack-Up Analysis

Date : 23 to 25 May, 2018

@ Bangalore

Last date for registration 16 May 2018


Manufacturing process, productivity and cost are often determined by component tolerances. If components are incorrectly toleranced, it leads to assembly problems. Too tight a tolerance leads to higher cost. Designers are expected to tolerance components optimally.

Dimensional variations in production parts accumulate or stack up statistically and propagate through an assembly kinematically, causing critical features of the finished product to vary. Such variations can cause costly problems, requiring extensive rework or scrapped parts. One of the effective tools for managing variations is Tolerance Analysis. Tolerance Analysis is a quantitative tool for predicting the accumulation of variation in an assembly by performing a stack-up analysis, reduces manufacturing costs by improving producibility and also enables design engineers to determine, how robust a design is at the drawing phase.

Keeping this in view, Indian Machine Tool Manufacturers' Association (IMTMA) is organizing a 3 days programme on Tolerance Stack-Up Analysis on 23 - 25 May 2018 at Bangalore, covering worst case tolerancing as well as statistical methods.

  • Understanding of stacks and why do we need it
  • Statistical tolerancing, Process capability indices and 6 Sigma
  • Loop diagram and the dimensional objective or critical functional relationship to analyze.
  • Calculate nominal output and statistical variation using statistical methods.
  • Worst case tolerance calculation, WC
  • Effect of dimensioning practices on tolerance variation
  • Root Sum Square, RSS and Modified Root Sum Square, MRSS
  • Empirical correction factors, Bender, Gilson, Gladman, and Greenwood.
  • Geometric Dimensioning & Tolerancing, application in Stacks analysis
  • Part stacks using bonus tolerance and datum shift, Float and biased floats
  • Effect of form and orientation tolerances in Stacks
  • Assembly stacks using profile, run out and position
Key Take Aways

After undergoing the programme, the participants will be able to -

  1. Understand stack-up analysis and why it is required in today’s design.
  2. Analyse and optimize the designs for ease of manufacturing and assembly while keeping functionality intact.
  3. Identify the critical tolerances which require tighter tolerance control or statistical process control, SPC.
  4. Enlarge drawing tolerances and thereby reducing cost of design.
  5. Develop robust design with low risk of failure.

Rs. 11000/- *

IMTMA Members / Micro Companies / Individual

Rs. 12000/- *

IMTMA Non Members

Participation Fee

+ 18% GST per participant

Group Concession : 10% for 3 to 5 and 20% for 6 and more delegates being nominated from the same company
(subject to availability of seats)

Register for this Programme
Participant Profile

This programme will be an advanced level one and will benefit Designers / product design engineers responsible for specifying, interpreting and analyzing tolerances.

Knowledge of Engineering Drawing and GD&T principles will be a pre requisite for participants to learn the techniques of tolerance stack-up analysis.


This programme will be conducted by Mr. Srinivas B, Industry expert in Product design and development. Mr. Srinivas has more than 23 years of rich experience in Aerospace and Auto industries in leadership roles within  India and international locations. He has immense hands on experience on stack-up analysis and carried out several complicated projects involving 20 to 30 components and several  floats. He has thorough knowledge of various Quality Standards for enhancing the operational efficiency such as Six Sigma, ISO9001, TS16949, etc.., and is a Six Sigma green belt trained and certified by Cummins.

Industries Participated

The previous programmes have been well received by delegates from Atlas Copco (India) Limited, Bharat Forge Ltd., Honeywell Technology Solutions Lab Pvt. Ltd., Lam Research (India) Pvt. Ltd., Mahindra Heavy Engines Ltd., Taegutec India P Ltd., Valeo India Private Ltd., Volvo India Pvt. Ltd., etc.

For Registration Contact

Himachal Bhowmik

Executive Officer IMTMA

Telephone : 080 6624 6902
Mobile : +91 9740092629,+91 9
Email :

REGISTRATION : Prior registration for participation is necessary. Number of participants is limited and will be accepted on ‘First Come First Serve’ basis. A Certificate of participation will be issued to participants.
Important Information : Participation fee includes, course material, working lunch and tea / coffee. Interested companies are requested to register online by clicking on 'REGISTER' button and by filling up the nomination authority and participant's details in specified form.

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