The Workshop Progress Thread 2019

[mal webberParticipant @malwebber91786]

Nice job on them wheels Richard they look grand.

[geoff walker 1Participant @geoffwalker1]

Hi Jim, (Nic)

I just noticed your earlier post 1/10 and see you have started the Muncaster oscillator. Good idea to have the frames laser cut, I know what you mean they were somewhat tedious to make, sawing filing etc.

This is how I started machining the cylinder casting.

1. I skimmed one end of the casting so it was reasonably square to the core hole. Then set the face plate up as shown in the next photo. The hole in the strap was drilled and bored in situ and is the same size as the spigot on the front of the casting, the pivot spigot.

The spigot fits snugly in the hole and the casting is clamped to the angle plate as shown in the next photo. With the other spigot running as true as possible, the trunnion spigot, just take a light skim of the diameter, the end and also centre drill the end. don't skim the inner port face at this setting.

Now hold the trunnion spigot in a collet or a grip true chuck and centre drill the pivot spigot. Using a half tailstock centre support the casting and skim the end of the spigot and also true up the diameter. Now hold the work between centres similar to the set up in the last photo, skim the trunnion spigot again and lightly face square the inner port face. Next set the casting up on an angle plate, port face down, and bore to size, 20mm diameter. also at this setting machine the casting to its final length 46mm ensuring that each end is an equal distance from the centre line of the trunnion.

Mount the work between centres again and turn the trunnion to the correct diameter and face the inner port face so it is 19mm from the centre of the bore.

.The cylinder flanges can be turned to size with casting mounted on a 20mm mandrel as shown in the next photo.

.The brass or gun metal disc is jb welded to the inner port face.

Hope this is of some help Jim Geoff

[Jim NicParticipant @jimnic]

Hi Geoff

Thanks for that descriptive post.

I am not well versed in how to approach castings, only 2 of my 10 completed engnes have used them so your guidance will be valuable indeed.

Jim

[geoff walker 1Participant @geoffwalker1]

Thanks Jim and you're welcome.

Here is another rotary table photo which shows how I machined a shoulder on the inside of the flanges.

The shoulder is for the hardwood cleading to sit on. The packing pieces are also hardwood.

I turned up some hardwood rings which I then split into segments and then jb welded to the cylinder. These were leveled at the same setting to the same height as the shoulders.

Geoff

[JasonBModerator @jasonb]

I got all the Midget parts finished, 57 individual items plus a further 30 custom made nuts, screws etc.

Luckily I remembered how it all went back together. Valve timing was set by eye while turning the engine over slowly watching when the valves opened and closed. A little more oil than the normal running level into the crankcase, some Colemans with a drip of 2-stroke oil into the fuel jar and give it a go. I got some pops straight away and with a bit more retardation of the timing it fired into life.

Throttle is by rotating the jam jar fuel tank but quite slow to react due to sizeable flywheel, advance & retard are a better way to set the speed which I had always intended was going to be for looks and noise rather than outright speed and performance.

Just goes to show that you don't need to worry about working to umpteen decimal places, a micrometer was only used on the crankshaft and the 0.8 MOD gears on metric ctrs were cut with 32DP cutter but it seems to start and run . Just needs a bit of colour to finish it off

[OldironParticipant @oldiron]

Nice batch of parts Jason. A right proper little jigsaw puzzle.

Video is private ?

[JasonBModerator @jasonb]

Is it working now?

[mal webberParticipant @malwebber91786]

Very nice Jason sounds lovely and sweet.

[Jeff DaymanParticipant @jeffdayman43397]

Nice runner Jason!

[Ron LadenParticipant @ronladen17547]

Yep its working now, and what a lovely little engine. I love the sound of it very nice indeed and good that you got it running so quickly.

[Brian HParticipant @brianh50089]

Super engine Jason, will it be at the midlands exhibition next week?

Brian

[geoff walker 1Participant @geoffwalker1]

Nice work Jason, I like it a lot.

Are you doing some drawings for it?

I'm looking to make an i/c engine next model, preferably 4 stroke, could be an option.

Is it air cooled?

Geoff

[JasonBModerator @jasonb]

I need to decide on the drawings, it is all done in Alibre but only modeled in 3D not working drawings.

Yes air cooled, would normally have just stuck out in the wind of a tether boat or car.

[Jim NicParticipant @jimnic]

Lovely little engine Jason. What's next, a Midget twin?

Jim

[JasonBModerator @jasonb]

Posted by Jim Nic on 13/10/2019 14:23:40:

What's next, a Midget twin?

I might just skip that stage and go straight to a radial, seven dwarfs cylinders seems appropriate

[martin perman 1Participant @martinperman1]

Posted by JasonB on 13/10/2019 12:24:12:

I got all the Midget parts finished, 57 individual items plus a further 30 custom made nuts, screws etc.

Luckily I remembered how it all went back together. Valve timing was set by eye while turning the engine over slowly watching when the valves opened and closed. A little more oil than the normal running level into the crankcase, some Colemans with a drip of 2-stroke oil into the fuel jar and give it a go. I got some pops straight away and with a bit more retardation of the timing it fired into life.

Throttle is by rotating the jam jar fuel tank but quite slow to react due to sizeable flywheel, advance & retard are a better way to set the speed which I had always intended was going to be for looks and noise rather than outright speed and performance.

Just goes to show that you don't need to worry about working to umpteen decimal places, a micrometer was only used on the crankshaft and the 0.8 MOD gears on metric ctrs were cut with 32DP cutter but it seems to start and run . Just needs a bit of colour to finish it off

Jason,

Whats happened to the video.

Martin P

[JasonBModerator @jasonb]

Posted by martin perman on 13/10/2019 14:31:09:

Whats happened to the video.

Martin P

What do you see that is wrong or not see for that matter?

[martin perman 1Participant @martinperman1]

This morning it said unexpectedly switched off, your latest post popped up on my computer this afternoon so I've just had another look and it now says connection reset.

 

Martin P

Edited By martin perman on 13/10/2019 18:41:07

[mechman48Participant @mechman48]

Lovely job Jason, nice 'putt putt' sound. Give that man a prize off the top shelf. .

George.

[Michael GilliganParticipant @michaelgilligan61133]

I don’t normally post any of my workshop progress tinkering, but I was rather pleased with this rescue:

An assembly was held together with three countersunk screws, the recesses in which had been mutilated beyond recognition [they were probably JIS crosspoint].

Using a suitably sized Slocombe centre drill, I managed to pop the heads off them, and then simply unscrew the remaining thread. There was no retaining compound or corrosion present … they were obviously just screwed-home so tightly that someone attempting to unscrew them using the wrong driver destroyed the recesses.

.

.

.

MichaelG.

[Richard S2Participant @richards2]

Finished the wheels for my 1" scale water cart. The old riveting tool I made 30 years ago came in handy. Added detail to hubs to reflect the casting pattern-

Oil tube and cap-

[Jeff DaymanParticipant @jeffdayman43397]

Great work Richard!

[mal webberParticipant @malwebber91786]

Superb job on them wheels Richard and that lettering must of taken some time but what a result and finish.

Mal.

[Phil PParticipant @philp]

Richard

Those wheels are superb, well done.

Can I ask you to enlighten us on how you produced the raised lettering please.

Phil

[Richard S2Participant @richards2]

Thank you Jeff, Mal & Phil. Lettering took about 2 hours for each wheel start to finish. Happy with the result.

Phil, have a look at the bottom post on page one of this (hopeful) link below to give a description. I have more lettering challenges on the plates at each end of the tank, so I'll try and sequence some pics on here at a later stage that may help (he says without checking he has enough lettering left).

Brass Lettering

Regards

[Author]

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