First mini lathe project, oscillating steam engine.

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MadNick:

--- Quote from: doubleboost on February 16, 2012, 06:00:55 PM ---Yhis shows how to do it
If it is good enough for Rob it must be good

John

--- End quote ---

Good link, I've always wondered how to do this.

Nick

Ross:
After speaking to still drilling on the phone last night, I decided that I'd try and use a boring bar to achieve the finish, I felt D-bits would be a bit of a pain to make for a beginner.

I made a couple of passes, the tool rubbed alot so I re ground it and it seemed to work better, though some 'lapping' was required.

After a while I think I'm happy with the finish, there is no nasty lines just a nice smooth finish all the way down.

Here is a picture, but is hard to photograph as the lighting is no good in the shed.

The next step is to put a recess on the end of the hole. I drilled right through the cylinder so I'll make a cap that is fanged to fit the recess and solder it in. But what is the best way to effectively cut the recess?with a normal cutting tool making small cuts working out from the hole?

Divided he ad:

--- Quote ---But what is the best way to effectively cut the recess?with a normal cutting tool making small cuts working out from the hole?
--- End quote ---

Personally I'd use the boring bar.

Assuming that your recess is going to be very slight, 1mm ish deep and not much wider than the bore itself?
Then you can as you said. go into the hole (not touching metal ) and then cut out as far as you want to.

You could also set the bar at the desired width and plunge cut the recess (you may want to experiment with this method first... Know your machines/tools capability and all that!)

If it's deeper and too much for one cut without chattering then I'd make multiple small roughing cuts and then a final one to finish it off neatly.

We probably have different ways of making stuff (We all do I suppose) but my way would be make the recess and then make the cap to fit it.
That way if I made a mistake, say wider or deeper recess than I originally wanted. I make the cap fit my mistake and it's not a mistake any more..... Well, not for others to know anywho :)

As said... Personal method. Plenty of other ways of flaying innocent kittens! :bugeye:

Ralph.

Ross:
I Put the recess on the end of the cylinder, and took it out of the chuck. thanks for the tips!

Picture:

In heinsight I should've drilled the hole for the cylinder port before drilling the bore. It'll leave a burr when I do, but I've made a little makeshift honing tool which should clean it all up a treat hopefully.

DaveH:
Ross,

Coming along nicely - well done :thumbup: :clap:

:beer:
DaveH

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