1/16 Bucyrus-Monighan Walking Dragline

[TylerDSAudi]

Haven't looked at this thread in awhile and wow great work! I wish I had that good of a detailed bucket for my dragline build!

Question what are your motors running rpm wise, im trying to size my motors for my Marion 8750 and having a hard time figuring that out on speed and torque needed. Thanks!

[9W Monighan]

Originally Posted by TylerDSAudi

Question what are your motors running rpm wise, im trying to size my motors for my Marion 8750 and having a hard time figuring that out on speed and torque needed. Thanks!

I used the technical data from my machine's spec sheet to get the feet per minute from each function.
My motors are:
Swing-2500rpm 1/17hp 130vdc
Drag- 500rpm 1/12hp 130vdc
Hoist 417rpm 1/29hp 130vdc
They are geared down to approx scale feet per minute through the gearing. The drag is too fast so I have the max rpm turned down.Someday I want to build the gearbox for the drag correctly using all the gears exactly like the 1:1 machine.
I can also change my speed by changing the stick travel with the limits on the DX7 transmitter.

[9W Monighan]

It has been very hard to find any time to focus on this due to being busy at work all the time.So I found some time to do a little work on my 9W before Cabin Fever. Since it was very hard to see last year at the show I painted the bucket last summer and I added some lighting to my boom. I bought these bolt LED's and turned them down to fit inside of some old Lionel flood light housings.



Turning down from 11mm to about .360" dia




3 Lights installed

[9W Monighan]

Well I found a little time to break out my model again and get to some more parts that need made. I decided to make some roof trusses and get some cover on this thing.

I made a simple fixture to machine the "T" bars since you can't buy the size I need.



A little scrounging around and came up with a cutter stack to mill these with a .040" web and flange.


Four cuts to depth and they turned out nice. Bigger cuts caused some problems.



A few ready for next step