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  #41  
Old 09-06-2014, 07:18 AM
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Default Re: Ny-Lint Mobile Dragline Conversion

Modified the drag bucket with a new heavier bottom that integrates the teeth into it, added chains but the are too short, adjusted the dumping line to be a bit longer. (What is the name for the short line that runs from the arch to the pulley and then to the crowd rope at the front of the bucket?)

http://youtu.be/Kbv0GUMWuSU

Jim
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  #42  
Old 09-06-2014, 11:39 AM
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Default Re: Ny-Lint Mobile Dragline Conversion

Quote:
Originally Posted by Rvjimd View Post
Modified the drag bucket with a new heavier bottom that integrates the teeth into it, added chains but the are too short, adjusted the dumping line to be a bit longer. (What is the name for the short line that runs from the arch to the pulley and then to the crowd rope at the front of the bucket?)

http://youtu.be/Kbv0GUMWuSU

Jim
Works nice Jim. To answer your question; "DUMP ROPE"

Playing around with the hoist chains drag chains and dump rope lengths, You will be able to dial it in perfectly for the digging conditions.
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  #43  
Old 09-06-2014, 04:14 PM
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Default Re: Ny-Lint Mobile Dragline Conversion

Very nice jim-works good and you operate it well also. Looks like you are having a little trouble with the back of the bucket lifting up when loading. You might try lowering the attachment points for the drag ropes on the bucket. Be cautious, a little does a lot. I agree with 9W, just keep tweaking things and you will get it perfect. Another old model survives!!!!
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  #44  
Old 09-06-2014, 06:08 PM
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Default Re: Ny-Lint Mobile Dragline Conversion

Tom,

Thanks. I have a few more things to do and will continue to adjust things, but I'm very pleased so far! Much easier working on this one compared to my first one that was the 1:50 die cast.

Jim
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  #45  
Old 09-08-2014, 09:16 PM
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Default Re: Ny-Lint Mobile Dragline Conversion

Now that it seems to be working pretty good, time to finish up.

Added studs to the end of the drums and supported with channel that will be attached to the inside of the cab on the off side to support the drums/servos.





Also turned a bit off the outside diameter of the to large drums and left a small high spot on the inside to reduce the friction on the angle support bracket.

Jim
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  #46  
Old 09-09-2014, 10:26 AM
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Default Re: Ny-Lint Mobile Dragline Conversion

Looking good jim. A lathe sure is handy!! Have you thought any more about the tracks?
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  #47  
Old 09-12-2014, 09:55 AM
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Default Re: Ny-Lint Mobile Dragline Conversion

Put some fancy on one of the pulleys. I can't keep away from the lathe!

Turned a shoulder and a center hub and put holes around the center. Should have moved the holes a bit further out. Having fun and learning all the time.






Anyone have ideas about making a pulley with spokes? I do NOT have a mill. Wonder if there is a way to produce something like that?

Jim
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  #48  
Old 09-12-2014, 11:09 AM
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Default Re: Ny-Lint Mobile Dragline Conversion

Jim-looks like you are having fun and learning about the lathe. I think a mill is the only way to do spokes. I did it on my mill but it took me a long time-

Maybe one of the machinist on here will comment on this.
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  #49  
Old 09-12-2014, 05:57 PM
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Default Re: Ny-Lint Mobile Dragline Conversion

Jim Go to my 9W build thread and look around pages 15-21 or so there are pictures of how I made my spoked sheaves. Here is one but If you look around I have the whole process step by step. I had to make 18 for my boom.
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  #50  
Old 09-16-2014, 06:08 PM
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Default Re: Ny-Lint Mobile Dragline Conversion

Steve, those are NICE looking!

Question for you machinists - is the order of my steps correct for making a pulley? I want to make two new pulleys for my boom tip and put holes around the outside of the wheel. I know it makes a difference depending on what is being made and with what equipment.

Here is what I think I'm going to do, but half the time (since I'm still learning) I get to a step and realize that I should have something else first or in different order...

Chuck the raw part in the three jaw
Face
Center drill and ream to 1/8" I want a final I'd of 1/8" for the steel rod in the boom tip
Turn the groove in the pulley
Here is where I'm unsure
Add the relief and center hub to the first side
Part off just oversize on the width
Drill the bolt circle holes around the diamete
Put it back in the three jaw, this is where it get tough because now I'm messing up the outside with the three jaw.
Add the relief and center hub to side two

I probably omitted a step here. Should I be using some type of arbor thru the center hole?
I am drilling my bolt circle holes on the vice on the drill press.

Is there some high school machinist text boom that would help me with this sort of stuff?

Jim
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  #51  
Old 09-17-2014, 10:27 AM
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Default Re: Ny-Lint Mobile Dragline Conversion

Jim-I certainly am not a machinist but I will offer this. If you are damaging your parts with the chuck you may be over tightening the chuck. You will learn as you go but on small parts using less pressure and making small cuts works for me.

Last edited by modelman; 09-17-2014 at 10:29 AM. Reason: spelling
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  #52  
Old 09-18-2014, 12:10 AM
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Default Re: Ny-Lint Mobile Dragline Conversion

One trick is to make a collet that can be chucked in the three jaw. Make it out of whatever round stock or pipe you have. Turn a bore just a thou or so bigger than your sheaves with a shoulder inside a little shallower than the width of the rim. Then slit one side with whatever you have that will make a clean cut. The slit will allow the collet to squeeze the sheave when the chuck is tightened. I whipped up a quick pic with my CAD program but it isn't making it easy to post it.
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  #53  
Old 09-18-2014, 06:46 AM
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Default Re: Ny-Lint Mobile Dragline Conversion

Jared,

That does make sense. I may have to try that.
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  #54  
Old 09-18-2014, 11:52 AM
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Default Re: Ny-Lint Mobile Dragline Conversion

Since you are going to have the center hole in the pulley, why not put a bolt and nut thru it and hold onto it when you turn the second side of the pulley? This works as long as you make sure to really tighten the bolt that you are putting thru the center hole and take light cuts with your tooling.
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  #55  
Old 09-18-2014, 01:55 PM
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Default Re: Ny-Lint Mobile Dragline Conversion

now that does look spiffy!! wow!!!
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  #56  
Old 09-18-2014, 03:44 PM
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Default Re: Ny-Lint Mobile Dragline Conversion

TC,

I actually have done that on a few parts. I have turned a couple pulleys from bar stock cause I don't have any round big enough, so I cut a square of the bar, drill it and chuck it in the lathe.

Here is a pic of my current mod. Don't want anybody to get the idea I use the lathe on everything now. bent some sheet and filing it down to make corner angle for my boom extension.



Jim
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  #57  
Old 09-21-2014, 07:58 PM
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Default Boom Modifications

Got two new pulleys made for the boom tip and a bit more to do to the boom extension.





Using sheet stock cut to the lattice shape for the cross bracing.



Jim
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  #58  
Old 09-22-2014, 10:01 AM
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Default Re: Ny-Lint Mobile Dragline Conversion

Looking good jim-how long will the boom be when done? Your pulleys look spot on too. Did you lay-out the holes free hand? Also, good idea to make the bracing in sections. I did it one pc. at a time and it sure took a long time. How will you attach the bracing, screws, solder, brazing? Keep posting pictures.
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  #59  
Old 09-22-2014, 01:53 PM
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Default Re: Ny-Lint Mobile Dragline Conversion

Tom, thanks. The pulleys are not perfect but good enough for this crane and I'm always learning something new every time I turn something. I did the layout with dividers, so I mark half way around each side and then drill the last hole between the last two marks that never hit in exactly the correct spot. I have my eye on a rotary table!

I'm not exactly sure how long the boom is going to be. I think my extension is about 5" extra. I eyeballed it trying to make it look good when mounted on the crane. I think it will add a bit of use ability to the machine.

Not sure how I will attach the bracing. My initial thought was standard aluminum rivets but my angle is so narrow that even my smallest rivets are not going to work. I might just use some glue of some sort and try to wedge them in so they are tight.

Jim
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  #60  
Old 09-22-2014, 02:19 PM
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Default Re: Ny-Lint Mobile Dragline Conversion

Jim, heres the thread I started on mine. You can see how long the extension is. if your interested I'll have to measure it for you later.
http://www.rctruckandconstruction.co...ead.php?t=7818
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