Author Topic: The Dickson!  (Read 16981 times)

Offline maury

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Re: The Dickson!
« Reply #105 on: October 24, 2019, 05:09:18 PM »
Progress on the Dickson. Making the Foot. The casting was machined on top and bottom
to get reference surfaces for later steps. There is an ofset both on top and bottom.
By the way, issue 3 mentioned in my previous post is not nearly as bad as I thought,
I misread the prints not realizing there was a step on the top side.

Today I'm making the foot. The casting cleaned up with .406 for the bottom step, a bit
more than the prints, but now it's .406. I leave about .003 for the JB weld joint, so
the foot will be .403 high.

First I prepared stock and set up in the CNC to cut the curves. Just easier than setting
up the rotary  table.

Next, I cut the slots in for bolt clearance.

Finally, I made the bolt pattern.

The completed part. It will be JB Welded to the casting at assembly to insure good  bolt
alignment with the columns.

maury
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Offline maury

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Re: The Dickson!
« Reply #106 on: January 12, 2020, 07:59:51 PM »
Well Folks, it's been a while and I'm a bit behind in my posts. I was working on the LP cylinder, but I had to do a little fill in. so I set it aside, and will gt back to it later.
in the mean time, I have done some work on the Governor lift jack and the coupling to the valve gear. The governor uses a hydraulic jack to control the angle of the valve sliders. unfortunately, it was just not practical to model the hydraulics at this scale, so I made a screw adjustable lift jack. The jack then lifts the valve sliders via a shaft with lift arms, and a turn buckle adjustable coupling. The lift arms are attached to the shaft using 6/0 taper pins to avoid any slippage. Lots of fun parts to make!

1) CNC machining the mount brackets
2) The mount brackets installed on the base
3) Fitting the lift Jack
4) drilling the lift shaft for taper pins
5) Reaming the lift shaft for taper pins
6) Lift Shaft assembled
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Offline Dennis

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Re: The Dickson!
« Reply #107 on: January 12, 2020, 10:35:40 PM »
Nice work Maury, thanks for posting the photos.
Dennis

Offline maury

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Re: The Dickson!
« Reply #108 on: January 13, 2020, 09:29:26 PM »
Dennis, thanks for tuning in.

Well, there is more progress to post. The Dickson is a triple expansion steam engine with A Joys valve gear setup. There
is a lot of action to watch as this engine rotates. There are also a lot of parts. I have completed making the parts and fitting them to the engine. There was a lot of hand fitting to be done. All the parts were made on the CNC, out of 303 stainless steel. This is my material of choice for non-painted bar stock parts. I machines quite easily, gives an excellebt finish, and doesn't rust.

below are various views of the valve gear.
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Offline kvom

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Re: The Dickson!
« Reply #109 on: January 13, 2020, 11:11:20 PM »
Quote
There is a lot of action to watch as this engine rotates.

That is a true statement.  Watching the full-size engine at the Henry Ford is quite hypnotic.

Offline maury

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Re: The Dickson!
« Reply #110 on: January 15, 2020, 05:44:21 PM »
Kvom, thanks for tuning in.
I plan to be exhibiting this engine (uncompleted) at NAMES this year, hope to see you there.
maury
"The trouble with socialism is that you eventually run out of other people's money."... Margaret Thatcher

Offline kvom

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Re: The Dickson!
« Reply #111 on: January 16, 2020, 12:12:14 AM »
I do plan to attend.

Offline Dennis

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Re: The Dickson!
« Reply #112 on: January 16, 2020, 07:33:33 PM »
Hi Maury,
the engine looks really good.  You don't get the full appreciation for how many parts there really are until you see the engine start to go together. 
I have been fighting a bad cold for a few weeks now and haven't been in the shop but still hope to have my bed plate mounted on the foundation and one of the generator rings and armature ( incomplete of course) mounted on the foundation for the NAMES show.  I borrowed a drill and reamer from my son to machine the main crank shaft bearings but haven't started the work yet. 
If you make it to the show I hope we can set the two models together.
Dennis