Twin Cylinder Steam Engine

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Darren:
The eccentric straps....

After testing my patience last night trying to drill a piece of plate/sheet brass and achieving nothing but broken drill bits and ruined pieces I eventually turned my attention towards some bar stock. If this means nothing to you see here for an explanation...http://madmodder.net/index.php?topic=1127.msg9154#msg9154

As you can see this is hex bar stock

Two pieces where trued up to an exact 4mm thickness in the mini lathe

I find the collet holder makes an excellent square, stands there all by itself leaving two hands free :ddb:

The piece was positioned using my center finder (I'd be lost without this now :dremel:) Then center drilled before drilling to a depth of 11mm 1.5mm dia.
I then ran a 1.6mm drill bit through ready for tapping.

Just to prove there are indeed two of them :)

The center was found and a step drill used to take the bulk of material away before cutting in half with a slitting saw.

Yep, still two of them, not messed up yet :ddb:

The slitting saw leaves an excellent finish. All these joints will need is a quick swipe over with a diamond file to de-bur and dress them.

I need to order some 2mm screws and taps to clamp these back together before continuing. Having drilled the holes before splitting I can be sure that they will line up perfectly :thumbup:

I used a pair of these as ultra thin parallels, they work quite well....

Darren:
Gosh that post sounds so dry....... :poke:

I had lots of fun making these honest.... :)

:ddb: :ddb: :ddb: :ddb: :ddb: :ddb: :ddb: :ddb:

bogstandard:
Darren, it was most probably the frustration from yesterday showing thru.

Now you have drilled your new ones quite successfully, you must be feeling a lot happier.

John

kvom:
I love the idea of shaping the straps with the hex stock. :headbang:

Divided he ad:
Nicely done sir :thumbup:

You'll find tapping those easy with the combination of your "easy machining" bar stock and your tapping stand :)

Post read fine to me.... What does that say about me?!?

Looking forward to the continuing developments :)

Ralph.

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