Finally – it lives ! Some tidying up to do – but very pleasing !
http://www.rootprompt.co.uk/wp-content/uploads/2010/09/10v.movArchive for September, 2010
One of the final jobs is creating two gland nuts to seal the cylinder and valve chest. Stuart supply a section of hex bar for this. After turning down to the required diameter, I used the drill chuck in the tailstock to keep the die square as I cut the thread.
Removing the die and using it backwards allowed me to get the thread nice and close to the shoulder:
With both ends of the hex bar threaded appropriately, I could then drill and ream for the valve rod – the cylinder gland needs to be larger, but that can be done after parting off:
The finish left after parting off was quite acceptable – it remained to use a small file to round off the sharp edges of the hex bar for a nicer finish:
The part left in the chuck could now have its bore enlarged for the piston rod. Here’s the parts nearly finished – just some gentle filing to remove any final marks.
Cutting the thread for the slide valve position adjustment screw.
Valve rod with fork end attached and mounted to the eccentric strap casting.
