Author Topic: CHUK, yes another one  (Read 925 times)

Offline Jo

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Re: CHUK, yes another one
« Reply #15 on: June 01, 2020, 01:57:36 PM »
I like both of those ideas,  thanks  :)

You may have noticed on some set ups I leave a long piece of rod in the tail stock poking through any holes as a safety device. One of the gentlemen  :lolb: I used to work for told me tales of his chuck unwinding from the nose on his Myford, bouncing backward through his closed window, which was on the second floor and finally embedding itself in the ground  :o Luckily no one was standing below.

Jo
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Offline Alyn Foundry

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Re: CHUK, yes another one
« Reply #16 on: June 01, 2020, 03:38:19 PM »
Personal safety is paramount Jo.  :ThumbsUp:

My late father lost his first love to an industrial accident during the last war. Whilst he was in Europe his girlfriend was working in an engineering factory, taken out by a lathe chuck key that had been left in the chuck.

You can NEVER be too careful in this hobby, in my humble opinion.

Cheers Graham.

Offline Noitoen

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Re: CHUK, yes another one
« Reply #17 on: June 01, 2020, 04:01:59 PM »
Personal safety is paramount Jo.  :ThumbsUp:

My late father lost his first love to an industrial accident during the last war. Whilst he was in Europe his girlfriend was working in an engineering factory, taken out by a lathe chuck key that had been left in the chuck.

You can NEVER be too careful in this hobby, in my humble opinion.

Cheers Graham.

Looks like in this case that the accident was a good thing  :censored:

Offline Alyn Foundry

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Re: CHUK, yes another one
« Reply #18 on: June 01, 2020, 04:51:21 PM »
That's certainly a different way of looking at it! :)

Cheers Graham.

Online Twizseven

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Re: CHUK, yes another one
« Reply #19 on: June 01, 2020, 11:23:27 PM »
Jo,
Have you now got all three versions of CHUK.
Colin

Offline Jo

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Re: CHUK, yes another one
« Reply #20 on: June 02, 2020, 06:28:31 AM »
No, not yet Colin  ;)

Jo
Enjoyment is more important than achievement.

Offline Alyn Foundry

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Re: CHUK, yes another one
« Reply #21 on: June 02, 2020, 12:18:49 PM »
No, not yet Colin  ;)

Jo

Hi Jo.

CHUK 3 is not for the feint of heart, one of most pernickety engines I've ever produced.... Hmmm. Hornsby Akroyd springs to mind.

A couple of videos taken at different times at the Anson Engine museum. This was a " GOOD " day!



Cheers Graham.

Offline Jo

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Re: CHUK, yes another one
« Reply #22 on: June 02, 2020, 05:29:38 PM »
Good try Graham, I'm still trying to make sure Surus does not know he is missing one of the set    ::)


The Cylinder had one last run through at the last setting to help smooth the bore before mounting it up on a mandrel to turn the outside of the fins round. With that done the cylinder was held in a three jaw with end support to have the end spigot added and I chose to also add a register for the cylinder head, which was not shown on the drawing  :headscratch:.

The cylinder was then remounted on the mandrel to have the gaps between the fins machined to make the fins look like they are all the same width and spacing. Finishing of the gaps was done with a hand file.

I also started converting a bit of scrap-bin-ium that had the desirable special coating into the cylinder head. That will have to be completed tomorrow.  :)

Jo
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Online steamer

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Re: CHUK, yes another one
« Reply #23 on: June 02, 2020, 05:33:36 PM »
Nice set up!
 8)
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Offline ChuckKey

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Re: CHUK, yes another one
« Reply #24 on: June 03, 2020, 05:05:02 PM »
On the subject of chucking practice, I have had third thoughts and, because you show a picture of it (the first set-up in this thread) and others might follow, I am going to mention it after all. It is not considered best practice for the preservation of one's expensive and accurate 3-jaw chuck to stuff rough castings in it. (Especially not if winding it up with a pipe over the chuck key for a safe grip.) Castings, and cob-ends of rusty archaeological finds, go in the 4-jaw.
« Last Edit: June 03, 2020, 05:08:49 PM by ChuckKey »

Offline Alyn Foundry

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Re: CHUK, yes another one
« Reply #25 on: Today at 11:38:45 AM »
On the subject of chucking practice, I have had third thoughts and, because you show a picture of it (the first set-up in this thread) and others might follow, I am going to mention it after all. It is not considered best practice for the preservation of one's expensive and accurate 3-jaw chuck to stuff rough castings in it. (Especially not if winding it up with a pipe over the chuck key for a safe grip.) Castings, and cob-ends of rusty archaeological finds, go in the 4-jaw.

Go back to your reference, you should notice that Jo has used a fairly " battered "  3 Jaw chuck for that particular operation.

To quote your word, I have been " stuffing " round castings into my 8" monoblock 3  jaw chuck for well over 30 years with virtually no detriment to its accuracy using no more than " White knuckle " force upon the key. I select a different chuck for any precision work, a case of " horses for courses "

Cheers Graham.


Offline Jo

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Re: CHUK, yes another one
« Reply #26 on: Today at 12:19:24 PM »
I use my collet chuck if I want accuracy, having said that the only battering on my three jaw is because it is 50 years old not and it suffered with coolant water damage over 30 years ago before I owned it not because it cannot hold true :) Something does not need to be perfectly circular to hold it in a three jaw, if the edges are uneven then that is overcome by using aluminium off cuts between the jaws and the casting it won't damage a decent quality chuck.


The Cylinder head is a simple turning operation.

The A frame takes a bit of thinking about: The feet and the top where the cylinder is going to mount have a lot of draft angle on them but it is the sides of the frame that need to be square so that is our surface we use to clamp the frame while milling the bottom of the feet and then turning it over to surface the top. Having taken the casting to height it is then possible to measure what is left and decide where the centre of the cylinder needs to go, this also provides a good indication of what is needed to complete the bottom of the cylinder.

So back on the Colchester to machine the 50.8mm diameter which is going to fit into the A frame and to add that sneaky extra fin that Graham adds to his engines to see if we notice it  :stickpoke:

Jo
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Offline Alyn Foundry

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Re: CHUK, yes another one
« Reply #27 on: Today at 01:56:45 PM »
Nicely done Jo....

Using the " Box " to support that awkward shaped casting is a great idea. I'm loving the extra fin BTW !

The late, Mike the Bike bored his cylinder mounting hole by first facing off the feet then securing the " A " frame to his already prepared base. He then mounted the whole assembly into the four jaw chuck and bored it out with a boring bar. We both used a hole saw for removing the majority of waste metal prior to the finishing work.

His other trick was to secure the " A " frame from underneath using two heavy studs and nuts, this gave the  " impression " of the base and frame being as one, so to speak.

Cheers Graham.

Offline Jo

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Re: CHUK, yes another one
« Reply #28 on: Today at 03:42:47 PM »
Thanks Graham  :) I think I prefer my holding method rather than Mike the Bikes one, it would hang out a rather long way  :paranoia:


I have bored the top the same diameter as the cylinder before the end of play today. In the morning I plan to do the counterbore to let the cylinder slide in and will have to think about how the two are going to be secured together  :noidea:


In the meantime I see there is a set of castings awaiting me for a fondle, it must be Thursday  :naughty: :wine1:

Jo
« Last Edit: Today at 04:46:31 PM by Jo »
Enjoyment is more important than achievement.