Twin Cylinder Steam Engine

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Darren:
Eh?

How do either of those links indicate what you prefer to use :scratch:

But you have answered it now. I've never found a use for metric fine, I just wondered if this may be it with such tiny & thin parts. Seems not.

bogstandard:
Darren,

The links were to do with your comment

--- Quote ---Bogs, I bin readin your book and you linked this place

http://www.jjjtrain.com/vms/library.html

Now that will keep me out of trouble for days, I'm trying to read your build but now I'm distracted....
--- End quote ---

Bogs

Darren:
oops, too early for me, I don't come alive till the afternoon :lol:

Not sure why I hadn't spotted those links before, too distracted at the time I guess :ddb:

Darren:
And with that I did wake up somewhat later and moved on a little with the engine build.

I have decided to go with Johns plans so everything from now on is to those dimensions unless otherwise stated.
I won't repeat the how to's etc, just snippets here and there.

For no other reason than I simply wanted to try a bit of micro boring I decided to make a very small boring bar. I could have just drilled this part.
I picked up a good handful of different routing bits from the market recently for 20p each, all tungsten tipped. For the boring bar I had a choice of two designs.

I chose the one on the left, they were both 1/4" and I needed about 4mm or so. So off to the grinder we go..
A little while later

Now for a holder, the shank was 1/4" and my holder was 10mm. A small alloy tube was drilled out to 6mm as I wanted a tight fit.

Tube was cut down its length with a slitting saw

Pressed together in a vice

Job done and ready for action

Darren:
Now to see if it works :)

Yep, worked a treat and I did all four pieces to an exact fitting to a length of 5mm Silver Steel.
Oh yes, forgot to mention the Silver steel rods turned up this morning... :ddb:

Next I made a jig as John suggested in his write up. This worked really well. Thanks John, that really did save some headache... :scratch:
I did mark out the piece where it needed to be drilled. Then I figured out the miller could have dine this a lot easier... :doh:
I've never used the graduations on the miller before, yes I know tell me about it.... :lol:
But this job gave me a chance to work out the grads and if they were accurate. I'm pleased to say they are spot on and no doubt more accurate than my marking out :smart:

Next the 2mm hole, well I made it 3mm and countersunk both sides...just for fun... :)

Wahey, they fit :ddb: :ddb: :ddb: :ddb: :ddb:

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