Author Topic: Nicholas  (Read 8388 times)

Offline Don1966

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Re: Nicholas
« Reply #15 on: November 26, 2022, 07:38:09 PM »
 :Love:


 :cheers:
Don

Offline cnr6400

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Re: Nicholas
« Reply #16 on: November 26, 2022, 09:09:50 PM »
 :ThumbsUp: :ThumbsUp: :ThumbsUp: :popcorn: :popcorn: :popcorn:
"I've cut that stock three times, and it's still too short!"

Offline Michael S.

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Re: Nicholas
« Reply #17 on: November 27, 2022, 06:23:06 PM »
Thanks Don and cnt6400,

I had no idea how much time it takes to make a crosshead. Spent half a Sunday building on it and it's not even finished yet.
The crosshead is made from one piece of cast iron. First cut to size on the milling machine. Then the guides were milled left and right. Adjusting with the stand mounted was very fiddly. The fingers are too fat!
when it fit, I drew the bore for the piston rod and temporarily checked it with a drill. I wasn't completely wrong. And I adjusted the hole a bit while drilling.
Then it was drilled, a clearance for the bearing was milled and two threads were cut.

Offline Michael S.

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Re: Nicholas
« Reply #18 on: November 27, 2022, 06:35:32 PM »
Then I took a rod and made a device out of it that holds the crosshead. The piston rod is 2.5 mm thick for me. Now I could machine the top end on the lathe.
So far everything looks good and next is the piston rod and piston.
We are celebrating the first Advent here with me and I wish everyone a nice pre-Christmas time.

Michael

Online crueby

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Re: Nicholas
« Reply #19 on: November 27, 2022, 07:18:06 PM »
Nice work! Those are some complex shapes to make and figure out how to hold.   :popcorn: :popcorn:

Offline Michael S.

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Re: Nicholas
« Reply #20 on: December 03, 2022, 11:43:41 AM »
I made the piston and piston rod today. Everything made of stainless steel. The piston should only be 3.17 mm wide, but when I measured it I decided on 4.00 mm. The piston rod was machined to 2.5mm. With a length of 37 mm, it wasn't that easy. The side where the piston sits was machined in a collet. An M 3 thread. Then brought the piston to the final dimension. That worked pretty well at first. The piston still needs some lapping.

Michael

Offline Michael S.

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Re: Nicholas
« Reply #21 on: December 03, 2022, 01:04:26 PM »
Now I have found that a 4 mm wide piston is too wide.
So everything was shortened to 1/8 inch (3.175 mm).
A rolled Teflon tape goes into the groove on the piston. I press it firmly into the groove with my fingernail.
With this model, every tenth really counts.

Offline Michael S.

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Re: Nicholas
« Reply #22 on: December 03, 2022, 04:03:48 PM »
The crosshead has now also got its bearing cap. He holds the split bronze bearing for the upper part of the connecting rod.

Online crueby

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Re: Nicholas
« Reply #23 on: December 03, 2022, 04:17:29 PM »
Looking great!  I don't think I have ever seen a crosshead designed like that one, interesting!   :popcorn: :popcorn:

Offline Michael S.

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Re: Nicholas
« Reply #24 on: December 03, 2022, 05:43:22 PM »
Yes, I have not yet built a bearing on a model steam engine.
But it is not uncommon for ships' steam engines.

Offline Michael S.

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Re: Nicholas
« Reply #25 on: December 04, 2022, 07:41:45 PM »
I have a question for the general public.
The machine gets a coat of paint? It's a showman's machine.
I was only able to find a model online. Colourless.
The model shown there also shows problems on the stand where the crankshaft hits.
The builder generously removed material there.
I now also realize that I have to rebuild the crankshaft. With less hub.

Michael

Online Admiral_dk

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Re: Nicholas
« Reply #26 on: December 05, 2022, 10:54:52 AM »
Are you asking what color the Engine 'Originally was painted in' or what color the different members would like to see it wearing / would paint it, if it was their own build ?

I feel with you - it is no fun discovering that there is a fundamental problem with the construction / drawings .... epecially after the fact -> need to make a part again  :wallbang:

Per

Offline Michael S.

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Re: Nicholas
« Reply #27 on: December 05, 2022, 11:12:53 AM »
Thanks Per,

Yes, my question was whether there are members who have seen this model at exhibitions before and what color the model was. Certainly with decorative lines.

Michael

Offline vtsteam

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Re: Nicholas
« Reply #28 on: December 05, 2022, 02:56:53 PM »
Great looking engine so far!  :ThumbsUp:   :popcorn:

So the Teflon tape is going to be the piston ring, or is that temporary?
Steve

Offline Michael S.

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Re: Nicholas
« Reply #29 on: December 05, 2022, 06:10:58 PM »
The one with the Teflon tape as a piston ring is not my idea.
At the Regner company, which sells steam engines as kits, this was described in the assembly instructions.
It works quite well. Oil collects in the band and seals well.
When operated with steam, the Teflon expands. I think now they build special pistons made of metal and Teflon sleeves for their models.

I bought another Reeves casting kit yesterday through ebay classifieds. The Warriors.
Someone there offered it without a blueprint.
Let's see how the castings are made.
I think it will work without a blueprint. I know the bore and stroke.
« Last Edit: December 05, 2022, 06:14:07 PM by Michael S. »

 

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