Re: Dragline Rebuild
 

I have the swing assembly finished and it works good so I am ready to install it on the model. Here is a few pictures-
http://i305.photobucket.com/albums/n...ps3b39d0d5.jpg

http://i305.photobucket.com/albums/n...ps8a675361.jpg

http://i305.photobucket.com/albums/n...psaa103119.jpg
This is a short test video-
https://www.youtube.com/watch?v=XTuLGUQFbJg
Now to put everything together and hopefully it will work.

Re: Dragline Rebuild
 

Wow that works nice, a lot of hard work right there, but for me that's the fun part! great job!

Re: Dragline Rebuild
 

So the purpose of the brass counterweight is to smooth out the start/stops? And it kinda looks like you even balanced the counterweight to offset the grub screws of it and the gear below too? What tool do you have to measure that?

Re: Dragline Rebuild
 

Thanks for your kind words. I agree, building is the fun part!!
That is correct joe-if I were using an electronic s.c. the flywheel probably wouldn't be needed. I have a balancer that I used to balance my props when I was racing R/C boats but the flywheel is not balanced perfectly. To do that I would need a polished stainless shaft .080" dia. about 3" long and that I do not have. I just drilled a hole opposite the set screw and there is also-2-holes drilled in the top (for extra weight if needed) but I did that with the rotary table so they are drilled and spaced correctly. The balance is close and there is no vibration.

Re: Dragline Rebuild
 

Very intuitive, would be very cool if you could figure out or design the shoes that could move it from place to place.

Re: Dragline Rebuild
 

I know how to make a walking system but if you look at the 1st. picture on page 1, this is the only place I have to work this model. There is no place to walk it. A scale step for this machine would be 2-1/2-2-3/4". No room for even one step. I have thought about making it a walker just for the fun of making the parts but it would be time and money wasted so it probably won't happen.

Re: Dragline Rebuild
 

I love that gear box. Once again, quality work upfront.

I would not have thought to use the flywheel.

Re: Dragline Rebuild
 

Lots of fooling around getting that gear train right eh?
I never needed the flywheel because I can program the ramp up on the motor with the settings on my motor drive boards. They can be set from 0-20sec. to ramp up to full rpm then down, "regen to stop" or, "coast to stop" Without, you get a big pendulum swinging back and forth :o I also have my radio sticks set up on a curve to ramp up. I may try the flywheel someday just to see how that would work.

Re: Dragline Rebuild
 

I used one of those doohickeys that slow down servo speeds. It gives the same slow acceleration/deceleration with a continuous rotation servo and it tamed my crane down nicely for much more scale operation.

Re: Dragline Rebuild
 

Do you get much backlash with all those gears?

Re: Dragline Rebuild
 

Thanks a lot-this is the 1st. construction model I built and it is not engineered very well but I think I have learned a little since this old model was built.

Re: Dragline Rebuild
 

Yes steve-it took some time to get those gears right. The flywheel works well for me but you are doing the same thing with electronics. Todays electronics work so good that I thought about getting a radio and-3-esc's and be done with it but I am going to try to keep it the old-style manual controls.

Re: Dragline Rebuild
 

I have no servos or radio on this model.
There is no backlash. The gear mesh is close to perfect.

Re: Dragline Rebuild
 

Just a small update-I got the dragline back together and with this new swing motor I found the swing speed controller doesn't work. :confused: Now I have to sort out this problem and fix or replace things until it works. The flat wound resistor I am using on the controller is only 35-40 years old so I can't imagine why it would go bad. :rolleyes: More later.

Re: Dragline Rebuild
 

Would like to see all the details from your controls but maybe we covered that already. Shouldn't be a big deal to replace a resistor or two. I am getting ready to acquire some swing pedals for my machine. I will give an update when it happens.:D

Re: Dragline Rebuild
 

ive always wanted one of these sized draglines. the mines here used to have one they took to shows but i think it wondered home with someone.

Re: Dragline Rebuild
 

Hi steve-Here is a couple of pictures of the hoist and swing control. The first one is the hoist which works good on the resistor set-up-
http://i305.photobucket.com/albums/n...ps60f28f1d.jpg
This is the swing control which I am rebuilding now-
http://i305.photobucket.com/albums/n...ps7ddae04c.jpg
I don't think it is a matter of replacing resistors. These cannot be found anymore. They were made for hi-performance car motors which turned hi RPM and drew lots of current. The swing motor I am now using only draws .125 ma. and I think that is why the resistor doesn't work-(not sure). Anyway I am reworking the swing portion and will post pictures as I go.

Re: Dragline Rebuild
 

You should build one. That's what I did after watching my grandson play in a dirt pile out behind my house. I thought we could have fun with the dragline together and we did for several years but now he is 15 and no longer cares about this but I guess I am still the kid at heart so I still enjoy running the drag.

Re: Dragline Rebuild
 

oh i might build one some day!

Re: Dragline Rebuild
 

I am re-building my hoist and swing controller with a different device used for the swing. Here is a picture of the frame with electrics removed-
http://i305.photobucket.com/albums/n...psd5a81dfc.jpg
In this picture you can see the left to right motion (swing) axis is off center.
http://i305.photobucket.com/albums/n...pscf362ff3.jpg
This was okay the way it worked before but now it has to be changed to have the axis on center since there will be gears on this. These pcs. are all chopped up since I had to change things a lot to get it to work originally but I am going to re-use the parts and cut on them some more. Here is a little quiz- does anyone know what this is-
http://i305.photobucket.com/albums/n...ps2f87a396.jpg
More coming later