1:50 Dragline

[Rvjimd]

First, thanks for all the comments and help!

I got the third channel working today! I think I may have had something pressing on the servo when I put the cab back on, because the pinion gear did not line up as good as it had when I originally fit it.

And, it is colder that CRAP here in iowa today and SNOWING! We are setting records for late year snow accumulation, man I am sick of winter! So, I did not take any video on the loading wall.. And, my brief testing with the pinion not lined up quite right caused a bit of binding and the shaft unscrewed from the servo. I'll be taking it apart to fix that so, if you are still reading....

Is it more common to use a big long chain around the slew ring gear and drive the chain with a pinion, or like my initial attempt of driving the ring gear directly with the pinion?

If I can figure out how to keep an o-ring on the slew chain ring it seems like that might work better? I have a perfect pinion pulley that would work good on the servo, front wheel from a slot car is actually an o ring tire on the rim with a set screw for the shaft! I would just need to fit or modify the ring gear with a grooved slot or ring.

Jim

[MattDk]

Hi

I'm new here, and the list of things that I want to make just got one item longer.

With regards to the servos Modelman might be right that you might find a servo that is smaller, that would not stick out, but I got another idea that might solve the problem, let me see if I can describe it in text.

If you took the servos and moved them to the back og the plastic that holds the "wire" and lay them down on top of each other, (if there is room) then they can stick out on each side, and you could make a pulley that goes from the servo to each cable drum. Te system could be made of string, and a positive side effect would be, that when you reach the very end, the string would just slip on the pulley setup, not damaging your servo.

Might workimage.jpg


Good luck with your build, looking forward to see the end result

Mario