Author Topic: Two little CHUK's  (Read 7071 times)

Offline Alyn Foundry

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Re: Two little CHUK's
« Reply #165 on: February 09, 2020, 01:28:36 PM »

Looking forward to seeing it Graham  :)

Jo

There's over an Inch of water covering the floor at the moment Jo, wellies at the ready. At least there'll be no risk of fire!

The winds are still pretty severe but the Sun has just come out.

Cheers Graham.

Offline Alyn Foundry

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Re: Two little CHUK's
« Reply #166 on: February 09, 2020, 03:01:07 PM »
Dramatic stuff eh??

Offline Alyn Foundry

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Re: Two little CHUK's
« Reply #167 on: February 09, 2020, 03:52:15 PM »
The video.    :)


Offline Alyn Foundry

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Re: Two little CHUK's
« Reply #168 on: February 09, 2020, 04:16:01 PM »
Success!!
      :)

Online Jo

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Re: Two little CHUK's
« Reply #169 on: February 09, 2020, 04:19:54 PM »
Does this mean you are making a CHUK 1 as well Graham :)

Jo
Enjoyment is more important than achievement.

Online Jasonb

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Re: Two little CHUK's
« Reply #170 on: February 09, 2020, 04:41:25 PM »
detail around the top seems to have come out well and what did you end up doing with the remaining brass?

I did venture out into the workshop today and made another epicyclic gearbox, this time a bit smaller using 1MOD gears.

Offline Alyn Foundry

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Re: Two little CHUK's
« Reply #171 on: February 09, 2020, 05:15:34 PM »
Hi Both.

Not at the moment Jo, this casting was done to finish my CHUK 2. As I didn't have a suitable piece of Brass to hand. I melted down a load of scrap steam locomotive parts that I bought from my local scrapyard many years ago.

The leftover Brass is still in the ladle Jason, my gas forge can get up to temperature very quickly. This is a
" must " for casting. I know there's been a lot of chat about kilns lately but they're not really suitable for casting as the time it takes is far too long because the metal will take on external gasses.

Cheers Graham.

Offline Alyn Foundry

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Re: Two little CHUK's
« Reply #172 on: February 10, 2020, 08:53:21 PM »
Just what I was looking for!
                 :)

Offline Twizseven

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Re: Two little CHUK's
« Reply #173 on: February 10, 2020, 09:19:06 PM »
Very pretty. :)

Don't get going too fast.

Colin

Offline Alyn Foundry

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Re: Two little CHUK's
« Reply #174 on: February 16, 2020, 11:28:51 AM »
Well....

That was a week ago, seems I didn't take too kindly to the session! Ended up with " Brass founders ague " an allergic reaction to the Zinc oxide vapour. By Wednesday I thought I was dying. Worst was the fatigue in my upper body. Glad to report that I'm feeling a lot better now but it's a reminder that I'm not getting any younger lol, and necessary precautions need to be in place for any future Brass smelting.

Despite the stormy weather I managed to get out to the workshop and get some work done on the housing and follower assembly.

Cheers Graham.

Offline Alyn Foundry

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Re: Two little CHUK's
« Reply #175 on: February 16, 2020, 08:23:09 PM »
Nearly there Jo !!   :)

Online Jo

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Re: Two little CHUK's
« Reply #176 on: February 16, 2020, 09:04:09 PM »
 8)

I was worried we had lost you to the weather.

Jo
Enjoyment is more important than achievement.

Offline Alyn Foundry

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Re: Two little CHUK's
« Reply #177 on: June 15, 2020, 03:01:50 PM »
We're on the " home " straight....

Just a " Chipmaster " valve and spring to finish.

Cheers Graham.

Offline Chipmaster

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Re: Two little CHUK's
« Reply #178 on: June 15, 2020, 06:52:19 PM »
Hi Graham,
Itís an honour to be associated with the cast iron diaphragm valve and Iím looking forward to hearing the tone .

Andy :ThumbsUp:

Offline Alyn Foundry

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Re: Two little CHUK's
« Reply #179 on: June 16, 2020, 12:05:58 PM »
You're welcome Andy....

With this engine I've tried to reduce the flywheel overhang to a minimum by using 15x2 mm Gauge plate for the shutter actuator. The bearing support yoke had just enough metal for me to mill a 15mm wide slot to help guide the arm just below the crankshaft. A second vertical slot was milled in the arm to help keep it gently tensioned against the flame port below.

I Silver soldered a section of the Gauge plate at right angles to cover the flame port. I'm also using an upward shutoff in the hope there'll be less flame disturbance.

I had several cam discs cast and like Jo I found them to be almost unmachinable. An overnight soak in the multi fuel stove and a decent Carbide tip found us a disc, hidden inside. But there's a tale....

I used your method of creating the cam profile ( 4 jaw chuck ) but when I offered it up to the engine I discovered I hadn't given quite enough lift. Back to the lathe for another swipe and disaster, a hidden hard spot caught hold of the tip and bang, cam disc trashed.

Not having much of what Jo refers to as " scrapbinium " ( Castings man )  :) I was at a loss. Luckily I still have many leftovers for the Robinson hot air engine, a crank disc was found and duly machined.

Oh what a joy it is to machine " Good Iron " no dust, no sparks just neat little curls, in no time at all I had a replacement cam disc and one that worked as well.

Just a few little " tweaks " should see a close to this thread....

Cheers Graham.