Joystick Lock Wiring - Part 3

After ensuring that the joystick assembly is operating smoothly the last task is to lock-wire the collars fixing bolts. As noted this builder had problems drilling the supplied stainless steel screws successfully so steel Unbrako M5 x 10 screws replacements were sourced.

Drilling screw heads

The screws were fitted to a machine vice and a pilot drill was used to create a start for the 1.5 mm drill. File a small flat to help the pilot locate itself on the head - locate the hole close to the base of the key in the head. Select a medium speed on the drill press to drill holes for the lock-wire. 

Note: Apply oil to the job as the bolts are high tensile and the drill tip must be kept cool and lubricated. This builder broke a number of drills during the process when hard spots were encountered. If this happens heat the head at the hole until  red hot then place aside to cool naturally. 

Use good quality drill as this may have been the original issue with the stainless steel screw's but stainless steel is very hard to machine.

Lock-wire Bolts

The bolts are secured with stainless steel lock-wire in pairs across the collars. This method was selected as it secured the wire around the head and prevented slippage. Cross drilling the head at 90 degrees would provide the builder with more options and should be considered.

Rob Carpenter video on lock wiring is an excellent place to start.

Comment: See article on pump installation before fitting lock wires

Fitting lock-wire correctly is a true skill that requires practice to get right - Got a long way to go

Fitting Lock-wire