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Author Archives: Steve Withnell
Profiling the Sides of the Lower Crank Case Half.
From here on in the machining gets more and more challenging. The sides of the Lower half of the crankcase have to be milled at 17.5 degrees from the perpendicular and the engine mounting lugs profiled into the crankcase … Continue reading
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Mistakes and Errors (In retrospect)
This is an odd picture for the blog. When I built my first engine (Nemett 15s) I’d spend hours machining a part, say the aluminium cylinder or crankcase, then leave it lying on the bench amongst spanners and tooling. … Continue reading
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Skimming the Lower Half of the Crank Case
I decided that it would be useful to install the machine vice for the next operations. I do try to avoid using a vice, setting them up can take quite a while, as there are three axes that can be … Continue reading
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Producing the upper crankcase flanges
The obvious set up to mill the flanges seemed to be to clamp the workpiece directly to the mill bed: But the clamp fouls the chuck, so I adopted a slightly more complex setup: The cutter is a 1/4 inch … Continue reading
Skimming the upper half of the Crankcase
This should be one of the easier operations, but it’s one that reveals if the marking out was any good. The next problem is the shape of the part. The sides are a little over 3mm so very little to … Continue reading
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Out of Hibernation and Back into the Shed…
So, following the winter break, I’ve finally set about the next step in my attempt to build a couple of Whittle V8 engines. If you’ve been following the thread, I decided that making two would not take much … Continue reading
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Taking Photographs
I’ve been taking digital photographs of various machining related activities for a while – currently I’m using a Lumix FZ28. Normally I set the camera to “intelligent auto” and let the camera work everything out. It’s normally pretty good at … Continue reading
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Facing the Crankcase to it’s final width
Having marked out the final width of the crankcase, I mounted it in the 4-Jaw chuck. Again, there is not much room in my 5 inch chuck for this piece. I used the slot in the chuck … Continue reading
Marking out the Crankcase
Here I’m setting up to mark out the two crankcase blanks prior to the next machining operations. I don’t have a surface plate, so I’m using a sheet of glass from an old scanner on the milling machine bed. … Continue reading
Time to make a start on the crankcase.
This photograph illustrates cutting the blank for the crankcase. My lathe has a 5 inch chuck, I think that is about the smallest chuck I would be comfortable with using this approach. First step is to clamp the round … Continue reading