Author Topic: Textile Mill Diorama  (Read 66441 times)

Offline J.L.

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Re: Textile Mill Diorama
« Reply #540 on: August 11, 2018, 09:25:29 PM »
The mounting pins on the 4-jaw were removed and the chuck was clamped to the milling table.

The 7/16" axle hole has been drilled and reamed.


Offline J.L.

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Re: Textile Mill Diorama
« Reply #541 on: August 12, 2018, 03:18:30 PM »
The eccentric was cut from its stub with a hacksaw and mounted on a brass stub mandrel. I was very happy to see it still running true. The hole is parallel to the track in the eccentric. There is no wavering of the part at all on the mandrel.

I have been lucky with this stub mandrel. The eccentric was lightly tapped onto it with a wooden mallet. Hopefully a set screw will not be necessary as both sides of the eccentric is faced and shouldered.

In the second photo, you can see that with a few more cuts, the face will true to the edge of the part.


Offline b.lindsey

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Re: Textile Mill Diorama
« Reply #542 on: August 12, 2018, 04:41:16 PM »
Nicely done John!!

Bill

Offline J.L.

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Re: Textile Mill Diorama
« Reply #543 on: August 12, 2018, 08:33:53 PM »
 Thanks Bill,

I find that the finished eccentric with its strap is too thick. It is supposed to finish at only 5/16" thickness. I remember Chris mentioning that they have to be very thin to allow more than one to work side by side on the crankshaft between the bearing and the takeoff pulley.

On many eccentrics, for this very reason there is no boss on either side. I knew this, but was letting the drawing through me off.

I will remove the boss from each side and thin everything down. Looks like I'll be resawing sawdust here, but if I don't get those eccentrics with their straps very thin, there will be problems down the road.


Offline derekwarner

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Re: Textile Mill Diorama
« Reply #544 on: August 12, 2018, 11:39:11 PM »
JL...does your eccentric disk not have a tapping on this diameter to lock it onto the crankshaft?.....if so would easily accommodate to lock the disk to the brass stub shaft in the lathe for reducing the disk width evenly ...Derek
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Offline J.L.

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Re: Textile Mill Diorama
« Reply #545 on: August 13, 2018, 02:12:29 AM »
Hi Derek,

Yes, this I know. The set screw will go directly down the centre of the track and secure the eccentric to the shaft. It's a long thread down, so often the top half of the hole is enlarged to allow a grub screw to engage a little further down.

I mentioned the drawing and the construction notes were throwing me off. They show and describe a boss on both sides of the eccentric.

As you say, a much thinner eccentric will be produced with them removed. I will also recheck the strap to bring it exactly to 5/16".

Thanks for the input.

John

Offline J.L.

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Re: Textile Mill Diorama
« Reply #546 on: August 13, 2018, 02:30:36 PM »
The pump eccentric is complete.

Derek, you pointed out the use of a set screw in the journal of the eccentric. I have found it a nuisance having to tear down a train of parts to get the strap removed so that that set screw can be used to adjust the location of the journal.

With a long boss, the set screw is external and easy to adjust while everything is hooked up. You are ready for immediate testing of the parts new location.

But with engines where space on the axle is at a premium, there is no other choice but to locate the set screw in the journal.

That's the case here, the eccentrics work in close proximity; one driving the pump and the other one operating the slide valve in the valve chest.


Offline J.L.

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Re: Textile Mill Diorama
« Reply #547 on: August 13, 2018, 05:48:31 PM »
So here is the eccentric on the shaft.

Do you see a problem developing?  :-\

Look at the second shot. I set a piece of brass pipe as a straight edge to see where it would land on the shaft from the fork on the slide valve rod.

There is not going to be enough room for the valve eccentric as it stands.  :shrug:

I'll worry about that later after I get the pump mounted.

Online 10KPete

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Re: Textile Mill Diorama
« Reply #548 on: August 13, 2018, 05:56:13 PM »
It is not unusual for a valve rod to have an offset bend to allow for such conditions...

Looking great!!

Pete
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Offline zeeprogrammer

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Re: Textile Mill Diorama
« Reply #549 on: August 13, 2018, 06:06:08 PM »
Here's a shot of mine with bent valve rods.
Looks like yours won't need as much bending.

I think I've seen some where the two bends are closer together but I think I prefer them further apart.
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Offline J.L.

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Re: Textile Mill Diorama
« Reply #550 on: August 13, 2018, 07:56:19 PM »
Thanks Pete and Carl.

Nice engine Carl.

Yes, a bent rod would work.  I like the idea of a tapered straight rod flaring out into mountings at both ends.

I am motivated to make that pump now - it will be a faux pump, so I can take liberties.  ::)

But before I start it, I wanted to post a couple of pictures of our much neglected room on the other side of the diorama. You can see the engine through the window and actually the eccentric just mounted!




Offline b.lindsey

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Re: Textile Mill Diorama
« Reply #551 on: August 14, 2018, 12:33:46 AM »
I see a PMR wood lathe in your future, but what is the other casting set? Ditto on the bent rod idea, should solve your problem.

Bill

Offline zeeprogrammer

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Re: Textile Mill Diorama
« Reply #552 on: August 14, 2018, 02:56:21 AM »
I see a PMR wood lathe in your future, but what is the other casting set?

Yeah. I was wondering too.

Well...I was wondering about both but Bill gave me the answer on one.
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
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Offline J.L.

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Re: Textile Mill Diorama
« Reply #553 on: August 14, 2018, 10:17:38 AM »
The second kit is a 1/12" scale replica model of a 1912 Crescent saw table. It will have both a fence and a crosscut mitre with quite a sharp circular saw blade mounted on its arbour.

Thanks for asksing.

John

Offline mklotz

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Re: Textile Mill Diorama
« Reply #554 on: August 14, 2018, 03:34:24 PM »
I see a PMR wood lathe in your future, but what is the other casting set?

Yeah. I was wondering too.

Well...I was wondering about both but Bill gave me the answer on one.

Looks like this when finished, Zee






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