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  #1  
Old 08-20-2014, 08:34 PM
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Default Ny-Lint Mobile Dragline Conversion

Just getting started converting my Ny-Lint crane, so here is the conversion thread.

I have a question for anyone with thoughts on the original construction method.

I don't see any obvious spot welds or other signs of how the various steel parts are fastened. Was this old stuff glued or welded or what?

I want to try to keep it looking like the old toy without destroying it in the conversion process. I would love to pop the lid off the back of it for storage and access during the conversion.





Jim

Last edited by Rvjimd; 08-20-2014 at 08:39 PM.
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  #2  
Old 08-20-2014, 09:32 PM
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Default Re: Ny-Lint Mobile Dragline Conversion

I see you're starting the flea market buy you picked up . I never fooled with my Nylint crane but most of these are just spot welded together. You may have to find each weld and grind through one layer but that would burn the original paint.. Then you'll be welding up a hole and repainting .of course.
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  #3  
Old 08-21-2014, 01:25 PM
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Default Re: Ny-Lint Mobile Dragline Conversion

I bought a set of these heli spur gears for this project. Nice to have a good hobby shop in town for all sort of stuff like this, I hate trying to find something like this online. I never know what it will look like for sure and can't tell if it has any chance of working out in a project.

Support your LHS or you will regret it later in life....



Jim
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  #4  
Old 08-22-2014, 01:51 PM
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Default Re: Ny-Lint Mobile Dragline Conversion

old metal toys are stamped tin. should be tabs to bend/move etc to open up parts. could be spot welded in places to.
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  #5  
Old 08-23-2014, 01:24 PM
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Default Re: Ny-Lint Mobile Dragline Conversion

Jim-is it too late to see a picture of the complete model before rebuild starts?
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  #6  
Old 08-23-2014, 01:49 PM
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Default Re: Ny-Lint Mobile Dragline Conversion

Tom, i think i have a picture of the poor thing before i was let loose on it!



I always like to see progress on build threads, so here is what I have so far and it is only about noon!

I have three servos mounted for drums. The bottom two will be hoist and crowd with lines coming out the front. The third drum is going to go up thru the roof and around a pulley, then up to the boom tip for boom control.

I'm also planning a double pulley down at the bottom of the boom for the crowd line to run thru so I can get the line down low when it comes out to a drag biucket.



Jim
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Old 08-23-2014, 02:11 PM
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Default Re: Ny-Lint Mobile Dragline Conversion

Thanks jim-I have not seen one of these This should make a nice project. Is this going to be a dragline only or drag & clamshell ?
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  #8  
Old 08-23-2014, 02:21 PM
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Default Re: Ny-Lint Mobile Dragline Conversion

Tom,

I am planning to make a drag bucket for it. I would really like to build a crawler undercarrige for it and maybe make it convertable between the motorcrane and crawler, but that is probably a big task and will not happen riht away.

I may try my brass clamshell on it, but I think it will look too small for it.

Jim
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Old 08-23-2014, 06:05 PM
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Default Re: Ny-Lint Mobile Dragline Conversion

looks good. If you want it self contained (no running wires or power etc through the turn table) put the 4th servo for spinning in the top half there. Did that for my unit crane. works awesome. batteries double as ballast lol
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  #10  
Old 08-23-2014, 08:41 PM
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Default Re: Ny-Lint Mobile Dragline Conversion

Very cool build! Can I see your drum and cable setup? I am building a machine what will have lots of drums and cables and im curious to see how you set everything up!
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  #11  
Old 08-23-2014, 11:10 PM
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Default Re: Ny-Lint Mobile Dragline Conversion

Jo,

I'm not quite to that point just yet. I just started turning pulleys today and I have find a drill chuck for the tail stock on the lathe before I can center drill them or the drums. I'm not sure if you can tell from one of the pictures, but the drums for the hoist, crowd and boom will be positioned in the center of the "window" right off the gear end of the servos.

You may be able to find more on the unit crane build done by small haul. He has a few pics showing the same sort of thing that I'll be doing.


I hope to be mounting drums in a few days so stay tuned, I am sure to post more pics when I get it to that point.

Jim
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  #12  
Old 08-25-2014, 09:25 PM
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Default Re: Ny-Lint Mobile Dragline Conversion

I got several pulleys and two rope drums turned on the lathe in the last day and a half. The first drum (the one I stuck in the cab for the picture) is going to be too long, so I turned a shorter one. I support the far end thru the cab and space them somehow.

I'm happy with the pulleys, I am going to need a couple more of them. They are tougher to do than the drums for me anyhow. I don't have any parting tool stock so parting them off is a pain. With the drums, I just start with a section of stock that is just oversized and then I can face it to length.



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  #13  
Old 08-26-2014, 10:52 AM
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Default Re: Ny-Lint Mobile Dragline Conversion

First video of the Nylint crane! Boom lift goes wrong!

The stick on the first lift is about half, second was full throw. I'm going to do some more testing, not sure if I'm still going to do four part line or maybe just two and use the stock pulley that is on the boom tip now. The thread I'm using is just a bit springy so I need to try some other stuff there.

http://youtu.be/38xs8Tdj9uw

Jim
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Old 08-26-2014, 01:31 PM
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Default Re: Ny-Lint Mobile Dragline Conversion

Looks like you are making some progress jim- I see you are learning the machining side of modeling. It's fun as a hobby but I think you will find that buying tooling is a never-ending process. I have had my lathe for 25 years and I still don't have everything I need but I just get something when I realize I cannot make a part without buying something else. I guess you got lucky on the boom fail. Booms crashing usually cost millions of $$$
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  #15  
Old 08-26-2014, 05:56 PM
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Default Re: Ny-Lint Mobile Dragline Conversion

Here is a video of the four rope configuration. I need to make bushings and adjust the frame for the cab pulleys and I'm going to move the boom tip location to clear better, but otherwise I like it.

http://youtu.be/Qg0TuI-uW8M

Jim
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  #16  
Old 08-26-2014, 06:27 PM
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Default Re: Ny-Lint Mobile Dragline Conversion

Jim, this is looking good, I'm following close as I have the same unit sitting on the table waiting to be converted. Won't get done any time soon, there is about 5 projects ahead of it.
So what actually failed, it looked like it spit the boom drum out?

Kent
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  #17  
Old 08-26-2014, 06:33 PM
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Default Re: Ny-Lint Mobile Dragline Conversion

Ya, I only had it friction pushed onto the servo with no screw or anything to hold it.

Jim
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Old 08-26-2014, 06:48 PM
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Default Re: Ny-Lint Mobile Dragline Conversion

Quote:
Originally Posted by Rvjimd View Post
Ya, I only had it friction pushed onto the servo with no screw or anything to hold it.

Jim
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  #19  
Old 08-26-2014, 07:21 PM
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Default Re: Ny-Lint Mobile Dragline Conversion

hey if you want some better line to use try nylon string it's pretty strong but im not sure how much clearance you have around the drum
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Old 08-29-2014, 03:10 PM
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Default Re: Ny-Lint Mobile Dragline Conversion

Making some progress on the crane. Got things aligned pretty good now, found a local supplier for stock so this morning I was able to turn a larger drum for the hoist. I think it will work fine, it is 7/8" stock and I turned the flanges fairly low so the inner diameter is still a bit more than 5/8" which gives me a drum speed that should work okay for the hoist and crowd drums. The larger diameter also helps to hold more rope making the storage of rope fit on one wrap.

I drilled out the top gear on the servos and taped them to 4-40. Then I run a machine screw from the inside of the gear so that is what you see poking out the top. Then the threaded drums screw onto the stud of the servo. This make it easy to screw the drum on or off of the servo for fitting, testing and maintenance.

Thanks go out to Scott (SmallHaul) for all the tips and help along the way!:chug:

And, I love the lathe! What fun! If you have ever thought about a small lathe and you like working on the sort of stuff that brought you to this site, I say go get a lathe.









Jim
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