Voir la source de Modification of ZX5 SR Axis Spigot to Eliminate Backlash

{{Tuto Details
|Main_Picture=Modification_of_ZX5_SR_Axis_Spigot_to_Eliminate_Backlash_IMG_6281.jpg
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|Description=<translate>How to modify SR axis mechanics to improve backlash characteristic</translate>
|Categories=Maintenance
|Tags=ZX5, SR, SR Axis, Spigot
}}
<translate>=Problem=
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. 

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=
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{{Tuto Status
|Complete=Draft
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