Exam (elaborations)
Millwright Manual Alignment – Questions & Answers
- Course
- MILLWRIGHT
- Institution
- MILLWRIGHT
Millwright Manual Alignment – Questions & Answers
[Show more]
Content preview
Millwright Manual Alignment – Questions & AnswersWhy are machines accurately aligned with each other? 23:1 ✔️Ans -
Machines are accurately aligned to work together smoothly. Thus
increasing working life.
How is the Primary unit positioned? 23:1 ✔️Ans -The primary unit is
positioned according to reference lines (centre-lines, benchmarks etc)
What are the other machines aligned with the Primary unit? 23:1 ✔️Ans -
Drive units; prime movers, transmission units etc. Are usually aligned with
the primary unit.
How is an alignment procedure chosen? 23:2 ✔️Ans -The alignment
procedure used is determined by the type of components connecting the
units.
What procedure is used to align coaxial shafts? 23:2 ✔️Ans -In-line
(coaxial shafts) are usually alogned with couplings in a procedure called
coupling alignment.
What are the results of coaxial misalignment? 23:2 ✔️Ans -Results of
coaxial misalignment are:
-reduced bearing life
-coupling damage
-high vibration
-reduced seal life
-increased downtime and costs
What conditions of misalignment are present in misaligned coaxial shafts?
23:2 ✔️Ans --offset
-angular
To align shafts correctly, in what two planes must these conditions be
solved? 23:2 ✔️Ans -Shafts must be align in both horizontal & vertical
planes
, Why is vertical alignment corrected first? 23:3 ✔️Ans -Because it is very
easy to disturb horizontal alignment when correcting the vertical
alignment.
How is vertical misalignment corrected? 23:3 ✔️Ans -By using shims
underneath the machine feet
How is horizontal alignment corrected? 23:3 ✔️Ans -By adjusting the
position of the unit on its base with jacking screws
Define angular misalignment. 23:3 ✔️Ans -Angular misalignment occurs
when the coupling faces are not parallel with each otheras well as the shaft
centre-lines.
How is angular misalignment corrected horizontally & vertically? 23:3
✔️Ans -Horizontal: jacking screws
Vertical: correct amount of shims under front and back shims.
Define offset misalignment. 23:3 ✔️Ans -When the centre-lines of both
shafts are parallel but not in-line.
How is offset misalignment corrected horizontally? 23:3 ✔️Ans -By
moving jacking screws on one side evenly till shafts are in-line.
How is offset misalignment corrected vertically? 23:3 ✔️Ans -By adding
or removing an equal amount of shims from all feet to bring shafts in-line.
Describe combination misalignment. 23:4 ✔️Ans -Combination
misalignment occurs when both angular & offset misalignment are present
between coaxial shafts.
Define Softfoot. 23:4 ✔️Ans -Softfoot occurs when a machines feet do not
equally support its weight; it does not sit firmly on all feet.
How does softfoot effect the machine? 23:4 ✔️Ans -Softfoot will stress the
machine housing and ovalize bearing bores.
What causes Softfoot?
23:4 ✔️Ans -Softfoot can be caused by:
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller LeCrae. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for CA$15.77. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
80461 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now