Back to the shop... Elmer's #43

Gallery, Projects and General > Project Logs

<< < (6/13) > >>

Brass_Machine:
Looking good! Keep it up.

saw:
I realy like your'e kind of work, it's a good workmanchip. :clap: :clap: :clap:

arnoldb:
Thanks Dave :beer: - I'll have to polish up that perspex cover a bit though. And the valve plate... It should work, but it's just not up to the standard I expect from myself; I'm my own worst critic :lol:

Eric, thank you; I will. The engine is about 90% done now, so it will take another 60% as much time to finish...

Thanks Benni :beer: - I'm still learning, but I'm trying hard to improve the finishes. Its getting easier for me to machine to dimensions, so I can actually spend a bit more time trying to get good finishes now.

This afternoon I started on the cross head. I used a bit of 16mm square brass bar that I have - and as it is already on size on the dimensions, I couldn't allow for any trimming off on the square bits, so I carefully clocked it up true in the 4-jaw chuck:

The overhang from the chuck is a bit long, but I didn't want to saw a bit off it - as that results in waste later on. I only have this bit of 16mm square brass, so neither wastage nor failure was an option; it's a great incentive to get things done right the first time :lol:

First I turned up and parted off the cylinder head. That was a simple job - I didn't take any photos. Then turned down the outside of the cross head to dimension; I love turning brass, as it's really easy to get a good finish on it:

The hole in the cross-head would have been easy to ream, but I don't have machine reamers; only hand reamers and those can't ream all the way into a blind hole because of the taper on the tips. This hole must be smooth and accurate all the way through to the blind bore at the back. Not feeling in any mood to make up a d-bit from silver steel for the job, I drilled the hole out to 7.5mm and used my small home-made boring bar to bore it out to 7.8mm. The boring bar barely fit in the hole:

Before moving to the mill, I also cleaned up the back of the workpiece to 12mm - this is for leaving a register ring to fit in the cylinder bore and parting off later:

On to the mill; the excess square stock made it easy to clamp up the workpiece in the vise, so this was a quick and simple job, taking care not to take too heavy cuts as material was removed:

Finally back to the 4-jaw for parting off. As the register was already turned, I could just part it off without completely re-centering the workpiece in the chuck:

The results of today's work:

The boss on the cover plate is not to plans - I left it to add something interesting to what would otherwise just be a square cover plate.

Regards, Arnold

DaveH:
Arnold,

Coming along very nicely :)

A clever bit of planning ahead worked well :clap:

DaveH

sbwhart:
Looking Good :thumbup:

Stew

Navigation

 Message Index

Go to full version