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Soft Foot DiagnosisSoft Foot Diagnosis&&
The Soft Foot The Soft Foot WizardWizard
Detection vs. CorrectionDetection vs. CorrectionDetection vs. CorrectionDetection vs. Correction
The amount of Soft Foot detected
does not equate
to the required Soft Foot correction!
Some Types of Soft FootSome Types of Soft FootSome Types of Soft FootSome Types of Soft Foot
Rocking (Highest values diagonally
opposed.)
Angled (Bent foot; bowed baseplate,
angled soleplate.)
Squishy (Too many shims, dirt, etc.)
Induced (External forces:
Pipe strain.)
Some Types of Soft FootSome Types of Soft FootSome Types of Soft FootSome Types of Soft Foot
Three types:
Short foot rocking soft foot:Short foot rocking soft foot:
Parallel airgap under foot with largest soft foot reading.
Tapered airgap (inwards) under diagonally opposite foot.
Even Rocking soft foot:Even Rocking soft foot:
Inward tapers under both diagonally opposite soft feet.
High Foot rocking soft foot:High Foot rocking soft foot:
Outward tapers under both diagonally opposite soft feet.
Larger soft foot value on foot nearest the high foot.
Rocking Soft FootRocking Soft Foot (highest values diagonally opposed)(highest values diagonally opposed)
Soft Foot DiagnosisSoft Foot Diagnosis
The typetype of soft foot can usually be determined by comparing the measured values.
Different types of Soft Foot yield different combinations of values.
Diagnosis and correction is expedited by recognizing the type of soft foot problem, then seeking appropriate additional data required to solve it.
Diagnostic ProcessDiagnostic ProcessDiagnostic ProcessDiagnostic Process
Number inside circle represents a laser soft foot reading.
12
106
3
Number in parentheses represents a shimming correction to make.
20 (Step Shim)
16 16
8 8
Numbers in the corners of each foot represent feeler gauge value of the air gap measured.
25 25
0 0
Arrow represents direction of taper of airgap, from highest to lowest.
Rocking Soft FootRocking Soft FootRocking Soft FootRocking Soft Foot
Imagine this condition on your machine. The front right foot is short. If you tighten the anchor bolt, the foot will bend until it can’t bend any more. Then, if you continue tightening the anchor bolt, you’ll either break the foot off, or distort the rest of the machine frame. If the foot does not break off...
Rocking Soft FootRocking Soft FootRocking Soft FootRocking Soft Foot
Suppose the short foot is now tight to the base. The frame is distorted and under stress. How will that stress relieve itself as you loosen each of the anchor bolts in turn, always with the others tight? Obviously, the short foot will come up as fast and as much as you allow it to, if you loosen its bolt.
Rocking Soft FootRocking Soft FootRocking Soft FootRocking Soft Foot
On the other hand, if the short foot is tight, the opposite corner (the back left foot) will also come up if you let it. So the machine “rocks” diagonally. Now imagine for a moment what the air gaps under each of these feet will look like, if you loosen these feet...
Rocking Soft FootRocking Soft FootRocking Soft FootRocking Soft Foot
Laser system indicates Soft Foot values greater than 2 mils at diagonally opposite corners.
12
14 1
2
1515
15 15
15
12
12
9
15
Short Foot Rocking Soft FootShort Foot Rocking Soft FootShort Foot Rocking Soft FootShort Foot Rocking Soft Foot
Please view our QuickTime video on rocking soft foot in action... Available as a separate download from our Learning Center page.
Induced Soft FootInduced Soft FootInduced Soft FootInduced Soft Foot
Laser tools will show soft foot values on two, three or even all four feet of the machine. The two highest values tend to be along the same side or the same end of the machine frame.
The distribution pattern of the values does not match any angled soft foot patterns.
Laser tools will show soft foot values on two, three or even all four feet of the machine. The two highest values tend to be along the same side or the same end of the machine frame.
Induced Soft FootInduced Soft FootInduced Soft FootInduced Soft Foot
The distribution pattern of the values does not match any angled soft foot patterns.
If you suspect pipe strain, the Optalign Smart will let
you check for that and quantify its impact on the
shaft alignment, so you can take this information to the pipe fitters as proof of the
problem...
The Soft FootThe Soft Foot
WizardWizardThe Soft FootThe Soft Foot
WizardWizard
It has a high resolutionhigh resolution sensor for accurate detection.
It will diagnosediagnose the problem and suggest a solution for it.
Laser Alignment SystemsLaser Alignment SystemsLaser Alignment SystemsLaser Alignment Systems
Rotalign Ultra is ideal forRotalign Ultra is ideal forsoft foot because:soft foot because:
Diagnosis: Example with LaserDiagnosis: Example with LaserDiagnosis: Example with LaserDiagnosis: Example with Laser
Example DiagnosisExample DiagnosisExample DiagnosisExample Diagnosis
Example Diagnosis:Example Diagnosis:Rocking Soft Foot foundRocking Soft Foot found
Example Diagnosis:Example Diagnosis:Rocking Soft Foot foundRocking Soft Foot found
Diagnosing the SolutionDiagnosing the SolutionDiagnosing the SolutionDiagnosing the Solution
Diagnosing the SolutionDiagnosing the SolutionDiagnosing the SolutionDiagnosing the Solution
Diagnosis & Solution FinishedDiagnosis & Solution FinishedDiagnosis & Solution FinishedDiagnosis & Solution Finished
Diagnosing the SolutionDiagnosing the SolutionDiagnosing the SolutionDiagnosing the Solution
An Angled Soft Foot Problem
Diagnosing the SolutionDiagnosing the SolutionDiagnosing the SolutionDiagnosing the Solution
An Angled Soft Foot Problem, cont.
ConclusionsConclusionsConclusionsConclusions
Soft Foot diagnosis & correction is always a challenge.
Consistently accurate Soft Foot diagnosis is possible.
RotalignRotalign®® Ultra Ultra makes this a breeze!
Thank you!Thank you!Thank you!Thank you!
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