Modification of ZX5 SR Axis Spigot to Eliminate Backlash : Différence entre versions

[version en cours de rédaction][version en cours de rédaction]
 
Ligne 6 : Ligne 6 :
 
|Tags=ZX5, SR, SR Axis, Spigot
 
|Tags=ZX5, SR, SR Axis, Spigot
 
}}
 
}}
<translate>=Problem=
+
<translate>18/08/2025 Moved to confluence
The design for locking the SR axis spigot to the top assembly initially relies on the friction of 4 off M6 cap heads to hold it firm
 
  
Under constant use, these bolts can loosen, giving up to 2 degrees of free play or backlash in the system. The symptom of this would be the axis suddenly jumping out of SR angle by a fixed amount up to 2 degrees. The only course of action being a recalibration.
+
Click [https://stuga-ltd.atlassian.net/wiki/external/YmE0MjFhZTRhM2VjNGQ2MjllY2IwYWU2YjNkMDY2OWM here]<br /></translate>
 
 
A workaround solution was implemented on Z057 using a secondary sensor and a recalibration on each turn of the SR axis.
 
 
 
The procedure described below resolves the root cause of the issue.
 
 
 
{{Idea|...This modification was fitted as standard from September 2021}}<br />
 
 
 
=Components=
 
{| class="wikitable"
 
|+
 
!Part
 
!Qty
 
!Description
 
|-
 
|M0001176
 
|2
 
|Clinch shakeproof washer
 
|-
 
|F0000579
 
|2
 
|Unbrako M6x16mm Capheads
 
|-
 
|D0015976
 
|2
 
|Modified Shoulder bolt (dowel)
 
|-
 
|
 
|
 
|8mm Reamer
 
|-
 
|
 
|
 
|7.8mm Drill
 
|}
 
 
 
=Solution=
 
A simple modification has been designed to eliminate this problem. The solution involves repurposing one of the 4 fixing holes and using a dowel pin to lock the position. Only one is needed because the spigot has a central flange precision location, only one dowel is needed to prevent rotation. 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{| class="wikitable"
 
|+
 
!
 
!
 
!
 
|-
 
|1
 
|Drop the motor and gearbox off the bottom - access to the M6 cap heads is gained under the M12 bolts in the main saw base plate. These can safely be removed because the plate is dowelled in place.
 
|
 
|-
 
|2
 
|From the bottom, drill out one of the M6 clearance holes in the top spigot to 8mm in small stages with a reaming tool
 
|
 
|-
 
|3
 
|Insert an 8mm dowel with a screw thread on the bottom into the relevant hole in the gearbox
 
|
 
|-
 
|4
 
|Reassemble - the gearbox now bolts on with 3 off bolts that we would like to replace with unbrako steel and a plate washer so they cannot come undone
 
|
 
|}
 
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=Exceptions=
 
<br /></translate>
 
 
{{PageLang
 
{{PageLang
 
|Language=en
 
|Language=en

Version actuelle datée du 18 août 2025 à 14:13

Auteur avatarGareth Green | Dernière modification 18/08/2025 par Gareth Green en cours de rédaction

How to modify SR axis mechanics to improve backlash characteristic

Sommaire

18/08/2025 Moved to confluence

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