An experimental V-4 wobbler

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spuddevans:
Thanks for the comments Saw, Chris and BiggerHammer :thumbup:

Tim

doubleboost:
The magnet idea is very clever :clap: :clap:
A friend of mine playes around with magic tricks
I bored out some coins for him and glued magnets in to them i was amazed at the strength of the little things
Great build log by the way :thumbup:
John

spuddevans:
Thanks John :thumbup:

I got a little more done today, namely the drilling and tapping the 32 holes in the cylinders for the packing glands and endcaps.

Having a DRO with a bolt hole function does make the drilling a lot easier, combine that with a vice-stop for repeatable workpiece positioning makes for a relatively easy time.

I got a little carried away with that and forgot to take any in-progress shots of the drilling, Oops :doh:

Then I mounted all 4 cylinders in a vice placed on my tapping stand, and I was really glad to have it. Tapping 32 holes with both M2 taps ( 2nd and bottom ) by hand would've been a nightmare.

As it was, I was able to tap a hole every 20secs, which I thought wasnt to bad. But after tapping 16 holes on the top, then turning them all over and tapping the bottom 16, I started to think if there could be a way to speed the process up a little.

One thing I noticed was that withdrawing the tap seemed to take longer and caused more ache in my arm. Then inspiration hit ( or perhaps it was a particularly bad case of wind :lol: ) and brandishing a hacksaw I made this little mod to the top of the shaft on my tapping stand.

Then I put a slot screwdriver bit in my cordless drill and selected reverse. Then I would wind the tap into the hole by hand until it reached full depth (just before the squeek) then back it out a quarter turn, then it was just a case of slotting the screwgun onto the newly made slot and 2secs later the tap was out, much easier on the arm!!

So at the end of that I have 4 (hopefully) finished cylinders.

Then I had to retire back to the pc to redo some of my plans to adjust some dimentions on the main frame.

Tim

spuddevans:
I got a little more progress today, not much to show, just some preperation work really.

I started off by making a little angle plate, this is needed for milling and drilling the internal steam passages in the "V" section. I have got some angled parallels (now there's a funny thing), but I didnt want to stack up 8 of them to make 45 degrees !!!

So I marked up a scrap of 10mm ali plate and rough cut it on the bandsaw, then mounted it on the mill table using a V-block to align it for finishing it.

I 1st up aligned the V-block,

this is taken before milling, and yes I did notice that one edge is not fully fitted into the V-block, I adjusted it and re-tightened it before milling.

Here's the result. I know that it is a little rough looking, but it will do just fine, it will only be used 2 or 4 times, and each time will only be for aligning the frame in the vice, the angle itself will have no pressure applied to it.

Then I turned to preparing the Ali for the main frame. I cut off a piece of 1/2" thick Ali' in the bandsaw, then cleaned up and squared the 4 edges. This just left the front and rear faces to clean up and bring to 12mm. My present flycutter has about a 30mm sweep, so it was not enough for this, so I sharpened up a new piece of hss and mounted it in the larger flycutter ( I have a set of 3 flycutters, up til this point I have only used the mid-sized one )

Tooling ready I took a couple of shallow cuts off each side (0.25mm doc), then checking with mic I reduced the thickness to 12mm. The last pass took off 0.1mm and left a really reflective finish.

Then I spent a while marking out the positions for all the holes to be drilled in the face.

Next time things should get a little more interesting, I will be drilling all the thru holes and then boring on each face the 10mm bore's that the cylinders pivot on, plus some bores for the crankshaft ballraces, then will be drilling the long internal air/steam passages (longest is 46mm)

Tim

saw:
You are doing good Tim :thumbup:

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