1/16 Bucyrus-Monighan Walking Dragline

[9W Monighan]

Originally Posted by modelman

Looking good Steve-I see you are giving Walter Bennett a challenge on most bolts used (rivets). I think I see a brake band on the rear drum. Is this a work in progress? Nice job!!

Brake band is in progress. No time right now. This was one of the reasons for the tear down. Now I have the machining done on the main frame to attach the necessary parts. I was going to use servos to actuate the clutch and another to set the brake. Changed my mind because I think a servo will burn up if the clutch doesn't shift exactly as it should without binding. And if it binds, I can't hear or see it with all the outside noises at shows. I am experimenting with some lineal and rotary solenoids.

[9W Monighan]

Came across this video today of the first time out with my new Marion controls.


https://youtu.be/vEEWWk-L6lo

.

[Rvjimd]

Looks like a good time to me!

Jim

[9W Monighan]

Decided to spruce up the bucket with some red paint to resemble the ESCO bucket I duplicated some before this weekends "Big Dig" at the National Pike Show. Last time out at the Cabin Fever Expo, I had trouble seeing my bucket with the lighting there. There are still wear plates and better teeth that need made on this bucket but that will come some day.



A quick dusting off in the sand blaster booth

[frizzen]

The bucket looks killer with some paint on. Did it help visibilty as much as you hoped?

But those signs are way over the top cool!

[9W Monighan]

Originally Posted by frizzen

The bucket looks killer with some paint on. Did it help visibilty as much as you hoped?

But those signs are way over the top cool!

The red bucket was much more easier to see. Shows up better in pictures too.

[Finster]

The model is pure awesomeness in itself, but the signs and red bucket really do add something. Nice touches.

[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

[skeeter]

I LOVE the light idea. The "T" bars look good too.

[9W Monighan]

Got some more TEE made now bending the trusses .

[9W Monighan]

Made some progress on these roof trusses this this week.

[egronvold]

True craftmanship

[kerst]

Looks good!

Kerst

[skeeter]

I love them roof trusses! Makes me wonder if the technique you used could be used to make a bridge structure.

[Jared]

Haven't been able to get on here for a while. Wow, great progress! Only problem I see is, no one will be able to see the great workmanship inside if you get it all covered up.

[9W Monighan]

Originally Posted by Jared

Only problem I see is, no one will be able to see the great workmanship inside if you get it all covered up.

That has been plaguing me for quite some time.
Some people ask me ; "When are you going to put the skin on it?" and some like to see the internals.
My plan is to make the house but also make it removable on the left side.
That way I can show off the machinery and be able to see if the wire ropes get screwed up . The operators cab is on the right side and that will need to be attached securely.
I hope to have scale operator in there with the controls working in unison with my movements on the 1:1 controls and some of the red and green lights on the control switches working as well.

[FabOne]

AWESOME job! I just picked up your post and now I'll make sure I check back!

-Terry