HP 4-6-6-4 Articulated

Re: HP 4-6-6-4 Articulated

Postby Murad » Thu May 10, 2012 9:12 am

Ok. Than just the joint between the frames and the back of the frame where the motor and truck mounts
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Re: HP 4-6-6-4 Articulated

Postby AstroGoat760 » Thu May 10, 2012 9:33 am

Murad wrote:Ok. Than just the joint between the frames and the back of the frame where the motor and truck mounts


That I can do. I have a bit of a fear of disassembling the running gear of model steam locomotives after I took apart an old Varney 4-6-0, and ended up bending the gear while it was off.
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Re: HP 4-6-6-4 Articulated

Postby AstroGoat760 » Thu May 10, 2012 9:55 am

Here we are:
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Re: HP 4-6-6-4 Articulated

Postby AstroGoat760 » Fri Feb 15, 2019 10:03 pm

Does anyone have a suggestion for what to use to make a u-joint for the front engine in the HP Challenger?
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Re: HP 4-6-6-4 Articulated

Postby Richard-B » Sat Feb 16, 2019 1:07 am

The FIRST question is how will you mount/support the worm and shaft on the front engine?

I would suggest a brass |__| (i.e. "U") bracket spanning the drive gear, and supporting the worm shaft with bearings and thrust washers on each side.

With the worm shaft extending to the rear, 2 universals joined with a sliding shaft should work well. The NWSL site has all the parts; drive shaft components from a diesel could also be used.
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Re: HP 4-6-6-4 Articulated

Postby AstroGoat760 » Fri Feb 22, 2019 7:40 pm

I have decided that I will use a spring for the u-joint on my Challenger as it will provide the needed flexibility, as well as enough "back force" to help keep the ball joint in it's seat as well.
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Re: HP 4-6-6-4 Articulated

Postby krokodil » Sat Feb 23, 2019 1:31 am

IMG_3822.JPG
Articulated 1


Here is my articulated construction from 1982-3.
The ball joint is very short, just about 10 mm, all wheels are driven with individual worm gears. Both frames can turn, the second one just a few degrees. The motor sits on the second frame and turns together with it.
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