Philip Duclos "Victorian" IC engine project

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bogstandard:
Steve,

That is a very interesting shape on the boring bar, I can only assume it is designed to act like a round nosed turning tool, but multiplied by two, to give a progressive cut as it is fed and leave behind a nice surface finish. I can definitely see where it would reduce chatter after the initial plunge. I have seen a similar style used on parting tools, but with sharp outside edges.

If the man says do it, then you should. Even though maybe a bit terse, he has been there before and is trying to help out in difficult situations that are not normally encountered, allowing the engine to be built when someone has limited technique knowledge. You can always do a bit of shape changing if you want to put your own mark on it at a later time.

I can't wait to see the next bit.

John

Darren:
That's looking good Steve, Interesting ideas there.... :ddb:

I shall be watching this one develop.....nice idea with the tape, some joe scratched marks in the paint on my S&B lathe to do this job.... :doh:

sbwhart:
Very nice write up Steve and a very interesting bit of machining,

I like your comment:-

"The delay getting back in the shop gave me time to do some mental machining and by the time I began I felt like I had a fair grip on the procedure. The photo below shows the completed cut".

Mental machine is something I do all the time gets me into trouble with the Boss, you know how it goes:- Boss- "shall we go and visit my Sister" - no answer - "is there something else you want to do" no answer - "well if you don't want to speak to me I don't know what I've done wrong" - "ho what were you saying I wasn't listening " :hammer: :wack: :hammer: :wack: :lol:

Back to your machining I've seen that forked tool recomended before I think it was in one of Tubal Cains book he called it a snakes tounge.

I was wondering:- in doing the recess you can't see what your doing as things a round the corner would you get a better vew if you ran the machine in reveres and had the tool on the other side this way the action would be facing you.

Have fun

Stew

cedge:
Managed to get the mill work done and then moved the engine body back to the lathe to begin shaping it. Contouring began with lots of rough cutting to get some generalized dimensions. I chose to free hand the contours, rather than sticking totally to Duclos's stylization. This proved to be an interesting exercise in both patience and eye hand coordination. To avoid any sharp edges ort corners, I used a rounded end cutter that is used for everyday roughing cuts.

As you can see.....things sometimes have to get to looking pretty bad before they get better....(grin)

Here is the work piece as the foot of the engine body began to take shape. Notice the roughing cuts..... not pretty and a bit brutal, but they did move a lot of metal fast.

Here the contour of the lower half is beginning to take on its final shape. The roughing cuts were refined a bit and then I broke out the files to fine tune things. A bit of sand paper was then used to remove the file marks. The base end was contoured first since the other end will be rounded and will no longer lend itself to being chucked in the lathe. The flat surfaces of the base will chuck just fine.

Lots to do. Gears and bushings to order, a crank to turn and a platform and support to shape before I begin the upper engine section and governor. One perfect part at a time.... one perfect part at a time.... one perf....

Steve

bogstandard:
Lovely stuff Steve, that sure is a nice seductive and tactile curve on that part. Makes you just want to stroke it.

Many people are scared to death of trying to hand contour pieces like you have, but you have shown it to perfection. A little time, plus one eye on the chuck for safety, and the other on the job in hand, can produce wonderful works of art, and this is getting back to the basics of turning, before toolposts et al. Plus it produces the finished article a lot quicker than people realise.

When I show some of my own work off, people can't believe that it was turned by hand, and expect it to be produced on a CNC machine.

I can see this engine becoming an absolute stunner, with your eye for detail and artistic flair.

John

BTW, if Chris is reading this, have a look at Steves' toolpost, it is the same type as Arc Euro do for your lathe.

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