Steam & Excursion > ORHC - Random Turntable Pictures

These pictures are totally random except for #1:  The man on the left walked in the door about a half hour after we opened today and handed me a check for $2,750 and said it was a donation for the turntable.  I don't handle money so sent him to our gift shop person who helped him with the paperwork.  Anyway the other guy in the picture is Dave, the person-in-charge (PIC) today.  The donor preferred that his name not be used and the organization he represented not be named, at least not today.

A note about the pics, basically all tracks and gravel are in, well tamped and wetted down.  No bumpers yet.  I did talk with Phil Barney who is doing final work on the control cabin and it is getting close.  The electrical slip ring for the top of the Harp has not shown up yet.  All conduits are in.

As you may be able to spot in a couple of the pictures, concrete blocks are being put in for retaining walls.  The three garden tracks are in and the one on the left goes right up to a retaining wall.  The outer two tracks look about the right length for a passenger car and the middle is longer and might   hold two or be the right length for one passenger car and the caboose.  I really don't know the actual lengths.

By the way picture three is the Davenport storage track and, like I said, no bumpers yet.

JOHN



Edited 2 time(s). Last edit at 09/10/23 19:29 by Jsporseen.

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Three more.  Sorry I tipped one picture.  Anybody wants to straighten me out, that's OK. (I straightened it out myself and removed the sideways one)

JOHN



Edited 2 time(s). Last edit at 09/11/23 13:35 by Jsporseen.

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Two More

Last picture shows the short stub track across from the access track, again, no bumpers  yet.

JOHN

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Very nice photos and kudos to the guy with the check.

Couldn't stand it so I rotated it myself.  I like this picture because it shows the conduit coming in to the motor best.  At least I think it does.

JOHN

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Thanks for pix.
What's the function of th large gear directly behind the eye-bolt in the motor?

Lurch_in_ABQ Wrote:
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> Thanks for pix.
> What's the function of th large gear directly
> behind the eye-bolt in the motor?

I don't know except that it is geared so that it cannot operate too fast, I think.  Understand that this answer is from someone who knows little.  If Wes Camp happens to see this, I'll bet he can answer the question.



Edited 1 time(s). Last edit at 09/10/23 20:38 by Jsporseen.

Ok....I'll take a stab at it..

The large gear, next to the blue motor, is part of an early stage of
the gear reduction*. The motor has a smaller diameter gear ..pinion gear.

The gear ratio is the number of gear teeth on the smaller gear ( typically 
like 25 teeth), and the number of teeth on the big gear --- say: like 100...
so, the first stage of gear reduction is 4:1, or 25:100. ( my teeth-count is 
illustration only, your ratio may vary..)

The other end of that shaft has another pair of gears, pinion & "driven-gear"
That pinion gear has larger teeth, and fewer --- I'd guess maybe 9 teeth, ,
the largest gear has maybe 99 teeth,  9:99, or 1:11 gear ratio.
The last ratio, is the circumference of the drive wheel, and the distance 
it travels in one revolution.

The total gear rstio is 25:124.  The motor spins 25 times for every 124 total teeth,
in one, wheel-revolution.  The distance traveled on the rim-rail in 124 revolutions,
is pi X the diameter of the wheel.  A 33" wheel X 3.141= 103.7 inches
103.7 = 8.642 ft. ( a little over 8 1/2 Ft, in one drive-wheel revolution).

*Notice however, that there may be a an additional pair of reduction gears 
under that black sheet metal "grease-cover" at the gear end of the blue motor.
which could be a 'primary' stage of step down gearing, like maybe 10:1
So you would have 10(124) or, 1,241 motor shaft rotations to get 1 wheel rotation.

Someone would have to confirm, that initial stage of reduction, under tyat grease cover.

But, that's my best guess..

​W.

( Note... right next (& parallel with) the motor is a plain steel shaft, 
              That steel shaft may have a rolling-element bearing
              at its far end,--- closest to the rim-wall ---- and a
              rolling-element besring adjacent to its gear --- under
              the black cover..
             It may be the shaft carrying the first stage gearing,
             that's under the grease shield ).


 



Edited 8 time(s). Last edit at 09/11/23 08:44 by wcamp1472.

I neglected to include these two pics when I began this post.  
1st - shows track from the pit around the corner of the DLM enginhouse
2nd - closeup of one of the rail fastenings discussed in a post about two weeks ago

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Very little clearance between the end of the table and the pit wall.  That center better be dead on center.  Good job!

Pandrol clips...or something similar. 

engineerinvirginia Wrote:
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> Pandrol clips...or something similar. 

Yes, Pandrol Clips, I had forgotten that term!

JOHN

thanks for your posting John!   Arlen

To Wes's fine description, you can see the jack shaft running between the primary reduction (end
of motor) down to the initial decondary which is the large gear mentioned.

Out

So...
The reduction unit on the motor drives the
jackshaft, which carries the pinion gear,
meshing with the first large gear....
Got it!

Thanks for the clarification..

W.