Hoglet Build

[Nick_GParticipant @nick_g]

Posted by JasonB on 27/03/2016 19:50:05:

Drawing only says "steel"

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I will carve up a pair of broken Aldi mole grips then.

Nick

[HopperParticipant @hopper]

Key steel is good stuff for things like rockers. It has a little more carbon in it than mild steel and machines very nicely.

[HopperParticipant @hopper]

Posted by Nick_G on 26/03/2016 16:59:02:…

The valves still need to be lapped. Although I have done one of them which took about 2 hours while watching TV

Nick

I wonder if you wouldn't be better off to make an automotive-style valve seat cutter that rotates on a precision spindle that is installed in the valve guide after the guide is installed and reamed to final ID?

Guides rarely go in dead straight so a seat cut to match the hole the guide presses into does not usually line up with the ID of the guide after it is installed.

A one-degree difference in angle between the valve and the seat is common auto practice to get a better seal without lapping at all. Might be worth trying?

[Nick_GParticipant @nick_g]

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Thanks Hopper.

There are a few areas of the design that seem a bit weak. Having said that there are a large number of them that have been made and running without issues.

Nick

[JasonBModerator @jasonb]

Nick, what are you lapping the valves with? I can usually do one in a couple of mins

[Nick_GParticipant @nick_g]

Posted by JasonB on 28/03/2016 13:12:30:

Nick, what are you lapping the valves with? I can usually do one in a couple of mins

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This stuff **LINK** made into a stiff paste with a tad of oil. – It's the 600 grit grade.

Nick

[Nick_GParticipant @nick_g]

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Just to let you know I have not been slacking. …………………… (totally)

I have been carving out larger bits and stacking them unfinished on the build so far so that I can get a feel of how it is going to lay out. This is so I can mill holes, drill and tap the aluminium plate base. I am needing to do this as I am deviating prom the plan quite a bit. – It's gaining size and weight.

I will post pics etc. of the machining of the various sections as I step to the finishing stage of each one.

Nick

[Nick_GParticipant @nick_g]

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On with the flywheel.

Billet was turned to make the centre hub to 4" dia.

After a cuppa and a few ciggs I plucked up the courage to butcher the 4 1/2" outside 3 1/2" inside bronze stock. I glue tacked some sacrificial washers to one side so that I did not run the boring bar into the chuck flange jaws.

I need not have fretted. It machined really nicely.

And tested the centre boss.

But don't it make you want to cry. All that bronze swarf. – But perhaps it will make good pan scrubs for the kitchen.

I think it was the American machinist Kieth Fenner that said in one of his videos. "There is something about bronze to men. Bronze to men is the same as diamonds are to women." – Must admit it is nice stuff.

I did a PCD on the mill DRO of 12 holes that fixed the 2 parts together.

I need to go to my mates workshop so that I can broach a recess into the hub to enable a keyway to the crankshaft. Once this is done I will make a keyed mandrill to place into the lathe to turn the outer side of the flywheel. ………….. Yes Jason, your recommended tips have arrived.!

Nick

[Nick_GParticipant @nick_g]

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Been saying for I while I need to make the base as it was getting larger and heavier. An accident was bound to happen.

Again the DRO came to my rescue. …………. I really would be up THAT creek without a paddle without them.

Some mounting holes for the engine. Plus some extra ones for a Baldrick style 'cunning plan'.

Some legs were made for it which will eventually fix to a bottom plate. I am thinking this maybe steel to give some mass in a low centre of gravity.

And an idea of how it's going to layout.

Nick

[Nick_GParticipant @nick_g]

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And a couple of vids of the flywheel activity if anyone is interested.

[thaiguzziParticipant @thaiguzzi]

Only came across this today. Just read all 5 pages. Nice project and great work from the pair of you.

Not wanting to derail the thread, any comments on the Hemingway v twin?

[Nick_GParticipant @nick_g]

Posted by thaiguzzi on 03/04/2016 04:52:16:

Only came across this today. Just read all 5 pages. Nice project and great work from the pair of you.

Not wanting to derail the thread, any comments on the Hemingway v twin?

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Thanks, but this is not a duo build. I can however understand why it may seem as such. – The other engine in this thread has already been made by Jason some time ago. The photos he has posted are ones he has kindly taken by stripping his to pieces to assist my build.

I have no idea about the Hemingway V twin. Others here may have though and I would personally not consider the thread derailed if it was discussed here.

Nick

[Nick_GParticipant @nick_g]

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Getting serious now.!

This arrived in todays post :-

It was suggested for me to use one of these by Jason. He is very good at spending my money that fella is.!!!!

Nick

[Nick_GParticipant @nick_g]

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Bit more progress.

Went to my mates workshop to cut a keyway in the flywheel hub. I was going to show the broaching in photographs but he did it so quick I missed it in the time it took to go for a pee.

With that done i cut a recess into the crankshaft so that I could fix it securely with a key for final turning. I suppose a purist would have used a 4 jaw dialed in but the collet chuck runs within 1/2 a thou.

Which proceeded with 'Jasons tips'

Made one of the main bearing blocks. (there will be 4 in total) With a pocket to accept the bearing. This is one of the areas where I am deviating from the original design.

Which looks like this.

And will eventually position like this. It will be fixed both to the crankcase side wall and to the base. I am also wondering about rounding the outer edges. – But the rest is quite angular. ……… 'Dunno' ??

And the crank will sit thus ish.

Painted the center hub and gave a couple of coats of lacquer. Also taped up the bronze outer to protect it while I am messing about with the rest. ………………… Bet I still scratch it though.!

Nick

[Nick_GParticipant @nick_g]

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The crank web blanks were tacked together with loctite and milled to shape as a pair.

These were then dressed and I had a semi assemble to see how it would start to look.

Made a start on the final shape of the bearing housing pedestals.

The parts of the crankshaft were joined with 638 and pinned. The center of the main shaft was then milled out.

Nick

 

Edited By Nick_G on 13/04/2016 08:53:39

[Nick_GParticipant @nick_g]

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Finished off the bottom end.

And a short video clip of it doing it's round and round thing. (radio was a bit loud in the workshop – sorry)

Nick

[Nick_GParticipant @nick_g]

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Hi guy's,

I am on with the con rods presently. This seems to be taking an age, but they are nearly done. So I will have to have the pistons to make sure all is as it should be.

On my previous 2 builds both of them had very simple pistons. Threaded disks really with a groove for the rings. But these are a tad more involved.

I know how to make the shape. But what I don't know is the best machining order so that I don't crush and distort the aluminium rascals as I move between lathe and clamping in the mill.

Drawing :-

Ideas please chaps.

Nick

[Bob MurrayParticipant @bobmurray]

Turn the piston from 1 1/8" or 1 1/4" stock with a 1" long chucking stub on the head end. Clamp the stub in the milling vise with a V-block, and mill the interior. Pivot the stub and V-block over and square up to drill and ream the wrist pin hole. Return to the lathe and part off.

Just my 2p.

 

Edited By Bob Murray on 28/04/2016 04:51:49

[JasonBModerator @jasonb]

As there are two of them rather than a chucking spigot just make them on each end of a 3" long piece of bar, final job will be parting off. Hold by central section of the bar

Or as Bob says have a smaller spigot on the head end that will fit a collet block or go into the chuck on a rotary table so milling and gudgeon pin hole can be done at 90deg

Or just shove it in a 1" collet and you won't crush things

Edited By JasonB on 28/04/2016 07:16:09

[Nick_GParticipant @nick_g]

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Of course. A chucking spigot.! ………….. Where were my brains at.?

Thanks, Nick

[Steven VineParticipant @stevenvine79904]

Posted by Nick_G on 28/04/2016 08:24:07:

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Of course. A chucking spigot.!

Nice avoidance of an expletive there Nick!

I must say, as well as the whole job, that red paintwork is looking very nice. I like it.

Steve

[JasonBModerator @jasonb]

Here you go Nick now I have a bit more time

1. Turn spigot, OD of piston and ring grooves then part off

Hold by spigot face end to length, drill out most of the waste and open up the skirt area with a boring bar

Hold by spigot in ER block or rotary table to mill out the recess

Then without rotating thre table set it vertically or just lay the block on its side to drill & ream for the pin, this keeps pin hole at 90deg to recess sides

Finally remove spigot and face the top of teh piston your multisize collets won't harm the piston

Edited By JasonB on 28/04/2016 13:13:21

[Nick_GParticipant @nick_g]

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Hi folks, It's been a good while since I have posted on this build.

I first I made the rings out of cast iron for the next stage and while it was set up I cut a few spares. (I need 4)

These were then split gently in a vice and a twist.

Then inserted a spreader into them. I then popped them into an old cast iron pan (so did not matter if it cracked) and put it upon the 'wok burner' at full blast for a few mins.

Then the blow torch was brought into the kitchen and the rings were brought up to a cherry red and held there for about 10 mins. Once this was done the lid was put onto the pan and the hob burner was left on and gradually reduced over about another 10 mins. The whole lot was then left to cool naturally.

I then had rings with some spring in them.

One of them was twisted, so it's a good job I made some spares.

Pistons were then made as per Jasons guide lines.

Nick

[Neil WyattModerator @neilwyatt]

… and to inspire those just starting out, two and a half years ago Nick was claiming to be a newbie

Neil

[JasonBModerator @jasonb]

Good to see you back at it Nick, nice pistons.

Is that one of the Eccentric inverted parting tools you are using?

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