Factors Affecting Arrow Head Accuracy

Additional root causes that can affect arrow head accuracy

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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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Draft