Factors Affecting Arrow Head Accuracy : Différence entre versions

[version en cours de rédaction][version en cours de rédaction]
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Arrow head setup on a Stuga Sawing centre (not Autoflow) should be simple - the sawing fences centralise around the profile
 
Arrow head setup on a Stuga Sawing centre (not Autoflow) should be simple - the sawing fences centralise around the profile
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{{Pin|...Autoflow and Microline machines have an axis-driven position for the saw blade centralise position, not a mechanical one}}<br />
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{{Pin|...Autoflow and Microline machines have an axis-driven position for the saw blade centralise position, not a mechanical one}}<br />If the arrow heads are varying or different on one profile to another, there must be other root causes involved - use this checklist to see if
 
{| class="wikitable"
 
{| class="wikitable"
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|+Root Cause Table - Saw, Flowline, ZX3/4/5
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|+Root Cause Table - All Saw, Flowline, ZX3/4/5
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!Root Cause
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!Potential Root Cause
 
!Symptoms
 
!Symptoms
 
!Checks
 
!Checks
 
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|Swarf or offcut stuck stopping the centralise getting to position
 
|Swarf or offcut stuck stopping the centralise getting to position
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|All arrow heads out by the same amount on one bar
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|All arrow heads out by the same amount on one bar or a set of bars in order, then correct again
  
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Arrow heads out by a long way (>5mm)
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Arrow heads out by a long way (>5mm) towards front of machine
  
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Mitre cuts lengths also out
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Mitre cut lengths also short (not long)
 
|Check the side fence reaches the profile when centralising
 
|Check the side fence reaches the profile when centralising
 
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|-
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|Z Support not active for profile or incorrectly set leading to profile rolling over in clamps
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|Z Support not active for profile
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|Arrow head different top to bottom of profile on Z profiles
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Z support incorrectly set for profile rebate
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<br />
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|On Z profiles, Bottom arrow head is different to top
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First or last arrow head on bar is different to others
 
|Check Z support settings
 
|Check Z support settings
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Manually check how the Z profile is clamped with the Z support out
 
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|Profile not symmetrical
 
|Profile not symmetrical
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|One profile incorrect, others ok
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|One profile incorrect but others ok
 
|See [[TB0395 How To Test T transom Symmetry]]
 
|See [[TB0395 How To Test T transom Symmetry]]
 
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|-
 
|Arrow head offsets (fiddle factors) historically set
 
|Arrow head offsets (fiddle factors) historically set
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|Some arrow heads correct, others not
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|Some arrow heads correct, others not, but fixed pattern, not varying along bar length
 
|Reset all ofsets to zero before starting
 
|Reset all ofsets to zero before starting
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|Side Clamps not parallel
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|First or last arrow head on bar is different to others
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|Check front fences are parallel with the rear
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{| class="wikitable"
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|+Root Cause Table - SY Drive Only (Refurb Flowlines with SY upgrade, All ZX5s)
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!Potential Root Cause
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!Symptoms
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!Checks
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|-
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|SY axis needs lubricating
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|Arrow heads varying with no pattern, change after redatum
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SY axis stalling and has following errors
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|Check SY axis moves full range of movement by hand and via drives screen
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|-
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|SY axis sensor not functioning correctly
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|Arrow heads varying with no pattern, change after redatum
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|
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|-
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|SY Axis Datum is wrong
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|All arrow heads out by same amount
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|Check and double check offsets
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Check repeatability of SY axis datum visually (mark a line and repeatedly
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{{Warning|..You have to ask yourself why the SY axis datum position has changed - there has to be a root cause. Simply changing the parameter will mask the real problem and therefore guaranteed to return again minutes or days later}}<br />
 
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Version du 15 août 2023 à 18:32

Additional root causes that can affect arrow head accuracy

Auteur avatarGareth Green | Dernière modification 17/08/2023 par Gareth Green en cours de rédaction


Additional root causes that can affect arrow head accuracy

Problem

Arrow head setup on a Stuga Sawing centre (not Autoflow) should be simple - the sawing fences centralise around the profile

...Autoflow and Microline machines have an axis-driven position for the saw blade centralise position, not a mechanical one


If the arrow heads are varying or different on one profile to another, there must be other root causes involved - use this checklist to see if

Root Cause Table - All Saw, Flowline, ZX3/4/5
Potential Root Cause Symptoms Checks
Swarf or offcut stuck stopping the centralise getting to position All arrow heads out by the same amount on one bar or a set of bars in order, then correct again

Arrow heads out by a long way (>5mm) towards front of machine

Mitre cut lengths also short (not long)

Check the side fence reaches the profile when centralising
Z Support not active for profile

Z support incorrectly set for profile rebate

On Z profiles, Bottom arrow head is different to top

First or last arrow head on bar is different to others

Check Z support settings

Manually check how the Z profile is clamped with the Z support out

Profile not symmetrical One profile incorrect but others ok See TB0395 How To Test T transom Symmetry
Arrow head offsets (fiddle factors) historically set Some arrow heads correct, others not, but fixed pattern, not varying along bar length Reset all ofsets to zero before starting
Side Clamps not parallel First or last arrow head on bar is different to others Check front fences are parallel with the rear
Root Cause Table - SY Drive Only (Refurb Flowlines with SY upgrade, All ZX5s)
Potential Root Cause Symptoms Checks
SY axis needs lubricating Arrow heads varying with no pattern, change after redatum

SY axis stalling and has following errors

Check SY axis moves full range of movement by hand and via drives screen
SY axis sensor not functioning correctly Arrow heads varying with no pattern, change after redatum
SY Axis Datum is wrong All arrow heads out by same amount Check and double check offsets

Check repeatability of SY axis datum visually (mark a line and repeatedly

..You have to ask yourself why the SY axis datum position has changed - there has to be a root cause. Simply changing the parameter will mask the real problem and therefore guaranteed to return again minutes or days later

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