Author Topic: Questions re Stewart Products 25 Ton Diesel Crane  (Read 4313 times)

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BCR 570

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Questions re Stewart Products 25 Ton Diesel Crane
« on: April 02, 2013, 02:28:49 AM »
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I have been unable to find any decent images of this product online.  If anyone has built one, would they mind replying with a brief description of the kit, and a photo of each side if possible?  I would also like to know the scale length of the chassis.

Thank you,

Tim
T. Horton
North Vancouver, B.C.
BCR Dawson Creek Subdivision in N Scale
www.bcrdawsonsub.ca
https://www.youtube.com/channel/UC3MbxkZkx7zApSYCHqu2IYQ

up1950s

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Re: Questions re Stewart Products 25 Ton Diesel Crane
« Reply #1 on: April 02, 2013, 03:19:56 AM »
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Mine is in the basement and because of a knee operation Monday I am trying to avoid the stairs for a while . If no one comes forth by Wednesday I will get down there and bring it up . As for construction , think GHQ . I have this shot handy for now , with my .10 brass used as wire ropes , which after painting makes them look like telephone cables  . :facepalm:



Here is a Atlas thread with photos and links to the Trainboard thread .http://forum.atlasrr.com/forum/topic.asp?TOPIC_ID=69059

This link has more of what you need Tim http://www.nscale.net/forums/showthread.php?21932-Stewart-25-Ton-self-propelled-Crane-%96-What-was-I-Thinking
« Last Edit: April 02, 2013, 03:40:53 AM by up1950s »


Richie Dost

Roger Holmes

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Re: Questions re Stewart Products 25 Ton Diesel Crane
« Reply #2 on: April 02, 2013, 11:46:03 AM »
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Check your pm
Best regards,

Roger

There are 10 kinds of people in the world.  Those who understand the binary system and those who don't.

randgust

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Re: Questions re Stewart Products 25 Ton Diesel Crane
« Reply #3 on: April 02, 2013, 12:05:36 PM »
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The only 'new' comment I have to offer is that despite any claims to the contrary, I've never figured out a way to power one.   I figured out how to do a Burro, which is WAY smaller, but the wheelbase and truck placement worked out in that.  The smallest powered trucks out there are either the Bachmann 44/70 tonner (horizontal shaft motor placement to a pivoting worm) or the kato 11-105 (horizontal shaft motor placement to a fixed worm/universal).  Both have about a 5'6" wheelbase with aprox. 28" wheels.  The only other thing that MIGHT work would be doing a vertical takeoff to one truck by doing an 11-105 motor vertical mount, but because the truck pivots, its a whole different ballgame than doing it fixed like I achieved in the 25-tonner.

If you want a self-propelled crane, the Burro is actually easier.

up1950s

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Re: Questions re Stewart Products 25 Ton Diesel Crane
« Reply #4 on: April 02, 2013, 02:59:58 PM »
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Chassis over OS sill length is 1.738
Chassis inside sill to inside sill is 1.619
Truck centers is 0.78


Richie Dost

BCR 570

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Re: Questions re Stewart Products 25 Ton Diesel Crane
« Reply #5 on: April 02, 2013, 11:05:13 PM »
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Thank you all for your replies - the photographs are most helpful.  The BCR had two smaller cranes - an American 75-Ton and an Ohio 25-Ton so I wanted to comapre the model with those to see how close (or not) it is.

Randy:  You read my mind!  I was indeed wondering if it could be powered.  I have the Kato chassis and a smaller upright one, but obviously you have already looked into it.


Tim
T. Horton
North Vancouver, B.C.
BCR Dawson Creek Subdivision in N Scale
www.bcrdawsonsub.ca
https://www.youtube.com/channel/UC3MbxkZkx7zApSYCHqu2IYQ

sirenwerks

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Re: Questions re Stewart Products 25 Ton Diesel Crane
« Reply #6 on: April 03, 2013, 08:34:05 AM »
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GN and NP had similar American cranes too.  That boom looks pretty thick on the Stewart model.  Is it a casting or an etching?
Failing to prepare is preparing to fail.

up1950s

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Re: Questions re Stewart Products 25 Ton Diesel Crane
« Reply #7 on: April 03, 2013, 08:46:16 AM »
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Etching


Richie Dost

ljudice

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Re: Questions re Stewart Products 25 Ton Diesel Crane
« Reply #8 on: April 03, 2013, 03:22:14 PM »
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A beast like this would make a lot of sense for MT or WOT to consider doing....    ;)

sirenwerks

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Re: Questions re Stewart Products 25 Ton Diesel Crane
« Reply #9 on: April 03, 2013, 04:03:37 PM »
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Etching

Really?!  Me thinks they should consider updating that.

BTW - here's a NP version American crane:

« Last Edit: April 03, 2013, 04:10:55 PM by sirenwerks »
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randgust

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Re: Questions re Stewart Products 25 Ton Diesel Crane
« Reply #10 on: April 04, 2013, 09:11:43 AM »
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One of the now-defunct major steelworking plants here in this town had an American 25-tonner for in-plant crane use, and also used it as the plant switcher.   The operator and I were friends; I got to ride around in it a couple times.

The actual propulsion method is a center-shaft drive right through the pivot, down to a 90-degree differential, and universal-style driveshafts out to the two inner axles of the trucks.  It wasn't electric, it was mechanical.   That's also why it essentially has modified freight car trucks because there were no traction motors in the trucks, just a differential on the inner axles.

The thing I remember the most about it is how hard it rocked whild switching, rather topheavy.  And while my friend was a good crane operator, somebody was responsible for the carnage evident at all the plant gates, track fencing, etc. by the tracks where it was obvious that the hook had snagged while they were plant switching cars in and out.

I've always wanted to use one for a plant switcher but its still evaded me how to pull it off.  I will tell you that the top speed on it was 'maybe' 5mph.

BCR 570

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Re: Questions re Stewart Products 25 Ton Diesel Crane
« Reply #11 on: April 04, 2013, 09:57:37 AM »
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Well that likely answers my question as to what type of trucks these had!

Is the chassis for the kit also metal or just the cab?

I am wondering how much size difference there was between an American 25-Ton and an American 75-Ton.


Tim
T. Horton
North Vancouver, B.C.
BCR Dawson Creek Subdivision in N Scale
www.bcrdawsonsub.ca
https://www.youtube.com/channel/UC3MbxkZkx7zApSYCHqu2IYQ

Hyperion

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Re: Questions re Stewart Products 25 Ton Diesel Crane
« Reply #12 on: April 04, 2013, 02:15:35 PM »
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We still use one all the time on the BNSF at Topeka.

As a crane, it can be operated by the clerical craft that also manages our storehouses.  We use the crane to handle large bridge and other engineering material, with a mag to handle bulk scrap, and to do some very minor switching operations.

I've got a couple pictures of it, and while I'm not presently expecting to be in Topeka anytime soon, can get some pictures when I do if anyone really wants them.  It doesn't have the usual roadnumber, only a very strange number that doesn't even look like our usual asset numbers, so I can't give any history on it.  But it looks just like the drawing posted above, so it's likely a former NP unit.

It does, interestingly enough, still roll on friction bearings.
« Last Edit: April 04, 2013, 02:17:07 PM by Hyperion »
-Mark

randgust

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Re: Questions re Stewart Products 25 Ton Diesel Crane
« Reply #13 on: April 04, 2013, 02:22:50 PM »
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Chassis is metal also.   It's not only heavy, it's lopsided to the right.   You have to rig up some kind of tight bolster screw or sideframe bearing to keep it from leaning.

I managed to get mine to the point where it really would run in a train, but it's so heavy that one unit is limited to six cars (including it) to make a 2.5% grade.

I made mine back in 1976 and have learned a lot since then.  If I were to do mine over, I'd definitely use .008 brass wire in sections instead of trying to rig the thing with thread.  Doing a 'lap at a time' from the top half of a pulley to the other half of the pulley with individual wires is actually a lot easier, better looking, and more durable than thread.    The effectiveness of this method on the Burro crane is pretty evident.
http://gustafson.home.westpa.net/Burro15.jpg
There's probably 10 individual pieces of wire, each bent over half of the pulley and then ACC'd in place.
« Last Edit: April 04, 2013, 03:19:58 PM by randgust »

BCR 570

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Re: Questions re Stewart Products 25 Ton Diesel Crane
« Reply #14 on: April 04, 2013, 10:04:34 PM »
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Thank you Randy.  I work with .008" brass wire a fair bit on my models so I would be quite comfortable going that route for the cabling.  I am waiting for photos of the BCR crane to compare with the photos of hte Stewart  model posted here.

Tim
T. Horton
North Vancouver, B.C.
BCR Dawson Creek Subdivision in N Scale
www.bcrdawsonsub.ca
https://www.youtube.com/channel/UC3MbxkZkx7zApSYCHqu2IYQ