Saturday 26 March 2022

Starting to rebuild the turret - and A2-5 spindle nose threads

I'll start by reassembling the locating plate onto the turret body. But first, I'll need to remove one of the 3 dowel pins. There's no way to drive all 3 pins in together.


I don't have a slide hammer, so an adjustable spanner pivoting on a broken 4mm end mill does the trick. The thread is M5, FYI.


That's better.


Then refit the shaft bushing:


This is the sequence of assembly. The piston pulls the turret against the housing.


Fitting the seal ring.


You can see how the whole shaft assembly shifts left and right under hydraulic pressure. The index plate on the right is held solid to the main body. The gear and ratchet plate slide with the piston.



I can't refit the turret until the replacement o-ring arrives. The outer sealing ring and o-ring is here on the right.


The main piston is back in place. 


The hydraulic motor and the rear roller bearing back in place.





The next part to go on is the index plate with its new o-ring. That will have to wait for now....


Spindle nose threads?
Yes, the A2-5 spindle nose has 7/16" UNC threads but some specs show that an M10 thread may be used. I have some 7/16" BSW taps which have the same 14TPI pitch but a different thread angle (55 rather than 60 degrees). I now know the correct fasteners to use for this spindle and clearing out the threads is a useful activity.


Well that's all I can do on the turret for now.....

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