[version en cours de rédaction]

Version du 24 janvier 2022 à 14:32

How to modify SR axis mechanics to improve backlash characteristic

Auteur Gareth Green | Dernière modification 29/11/2022 par Gareth Green en cours de rédaction ⧼frevu-button-review-label⧽

How to modify SR axis mechanics to improve backlash characteristic

ZX5, SR, SR Axis, Spigot

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, but this procedure resolves the root cause of the issue.

Components

M1176 x 2 OFF

F579 x 2 OFF

D15976 x 2 OFF

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



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

Exceptions

en none 0

Commentaires

Draft

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 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, but this procedure resolves the root cause of the issue.
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Modification of ZX5 SR Axis Spigot to Eliminate Backlash : Différence entre versions