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1963 Shelby Cooper Monaco King Cobra


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#26 Bill from NH

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Posted 24 October 2020 - 09:33 AM

I have an indexing & dividing attachment to use with the Unimat I've had since the early 70's.


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#27 dc-65x

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Posted 25 October 2020 - 05:51 PM

Time to build a chassis for this motor. I've build both pin tube and piano wire versions for 705/706 motors but I wanted to do something different.

I've always thought this Cox brand brass chassis for the Pittman DC-65 looked cool:

 

King Cobra Chassis (3).JPG

 

I've decided to pattern (NOT clone) my chassis main elements after it. My milling machine was used again to make the motor mounting brackets. These will be screwed into the holes I drilled and tapped into the motor side plates:

 

King Cobra Chassis (5).JPG

 

The Cox chassis has slots cut into 5/32" brass tubes that are soldered to the side plates. I'm did the same thing:

 

King Cobra Chassis (6).JPG

 

A hand saw, band saw or cut off disc could be used for the slot but I used my milling machine again. I made this slitting saw mandrel when I was an apprentice. A keyway with a key isn't needed to keep the blade from slipping in light applications):

 

King Cobra Chassis (1).JPG

 

Here's the slitting saw in action. It made a perfect cut dead center in the tube:

 

King Cobra Chassis (2).JPG


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#28 SpeedyNH

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Posted 26 October 2020 - 05:20 PM

nice setup! i'd forgotten about those tubes slit for the plates. 


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#29 dc-65x

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Posted 26 October 2020 - 06:30 PM

Thanks Steve. I also needed to drill a hole in those tubes for the drop arm hinge. I used that as an excuse to buy a sensitive feed drill chuck that I've been wanting from the Little Machine Shop.

 

Here's a link:

 

Little Machine Shop

 

The chuck uses your finger tips to grab the large ring and pulling down to feed in the drill:

 

King Cobra Chassis (19).JPG

 

Because the wider rail spacing I decided to add a 5/32" tube brace the Cox chassis doesn't have. I used a 5/32" end mill to cut the birds mouth notch to fit the main rails:

 

King Cobra Chassis (7).JPG

 

Then I changed my mind and went with a square tube:

 

King Cobra Chassis (8).JPG

 

I also had to cut a birds mouth notch into the 1/8" main rails that attach to the axle tube. This time I used a round file:

 

King Cobra Chassis (4).JPG

 

Here are the main chassis parts along with the taped up motor:

 

King Cobra Chassis (20).JPG

 

Final test fitting in my Rick's setup jig:

 

King Cobra Chassis (12).JPG


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#30 SpeedyNH

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Posted 27 October 2020 - 06:53 PM

yeah, i want one of those feeding chucks too. 

nice work, as always. 


Steve Lang

#31 dc-65x

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Posted 28 October 2020 - 04:56 PM

In the build jig with all the soldering done:

 

King Cobra Chassis (22).JPG

 

All cleaned up and ready for a drop arm:

 

King Cobra Chassis (23).JPG


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#32 Larry Horner

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Posted 29 October 2020 - 01:53 PM

Simply amazing as usual!  :good: Can't wait to see it with the uber cool motor installed.

 

Rick, someday you need to do a post strictly on your cleanup techniques. No matter how hard I try, I still end up with a few file marks and your's always come out pretty much perfect every time. How do you do that?



#33 dc-65x

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Posted 29 October 2020 - 02:44 PM

Thanks Larry, I'm looking forward to getting the roller together and testing it too.

 

Filing, done "korrectly", is really an art and since I'm not an artist I try to avoid it.  :crazy:    File marks can run pretty deep especially if the file gets clogged (called "pinning").

 

Instead of filing I most often wrap sandpaper around a file or a 6" machinist scale. The coarsest I use is 320 grit then finish with 400 and 600 grit.


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#34 dc-65x

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Posted 30 October 2020 - 12:07 PM

I've been scratching my head to come up with a drop arm design.  :unknw:    I know I'm going to use an early Cox guide and instead of "combing out" the stiff braid I'm cheating and using some softer stuff:

 

King Cobra Chassis.JPG

 

Finally I decided to combine brass strip and brass pin tube. I drilled holes in the strip because the builders in the old magazines were always drill holes in things  :laugh2:  and I think it looks cool  :sun_bespectacled:  Here are all the parts ready to go into my Rick's jig:

 

King Cobra Chassis (14).JPG

 

And all soldered up except for the hinge tube. That needs another step:

 

King Cobra Chassis (15).JPG

 

The cleaned up arm needed a notch cut into the pin tubes so the hinge tube would be flush with the brass strip. I used my jig's dowel pins with some axle spacers slipped over them to act as a bearing/guide for a round file to cut the notch:

 

King Cobra Chassis (17).JPG

 

As soon as the file kissed the brass strip it's done:

 

King Cobra Chassis (18).JPG

 

The hinge tube and drop arm in the jig for soldering:

 

King Cobra Chassis (24).JPG

 

All finished up except for a down stop. I'm still not sure about that. Lots of older cars just used the lead wires.  :shok:  I'll come up with something:

 

King Cobra Chassis (25).JPG

 

 

 

 

 

 

 

 


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#35 Isaac S.

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Posted 30 October 2020 - 02:33 PM

I would just solder on a piece of rod or piano wire like this. I would just shape it to the brass sheet. It also would look really original with that chassis. Looks really great so far! 

post-5-0-94218300-1442351730.jpg


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#36 dc-65x

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Posted 30 October 2020 - 03:45 PM

Thanks for the suggestion Isaac, that would look cool. I haven't posted a picture of the drop arm in the chassis yet. But it won't work on this chassis because my drop arm is flush with the bottom of the chassis. It's not sitting above the main rails like the Cox Gurney Stocker. A stop that would allow some drop arm movement would drag on the track.  :o


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#37 Isaac S.

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Posted 30 October 2020 - 03:55 PM

Okay, that would make a ton of sense. 


Isaac Santonastaso

#38 dc-65x

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Posted 01 November 2020 - 12:26 PM

While ruminating on the drop arm down stop I went ahead with the body mounts. I'm using the cool Kemtron "body mounting brackets" on the rear. They wrap around the frame rail to strengthen the 2-piece rear pin tubes:

 

King Cobra Chassis (26).JPG

 

All soldered up in the jig. The front pin tube was bend downward to act as the drop arm upward stop:

 

King Cobra Chassis (29).JPG

 

The chassis all buffed up and ready for that drop arm:

 

King Cobra Chassis (27).JPG

 

Here's that Kemtron piece in place:

 

King Cobra Chassis (28).JPG


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#39 don.siegel

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Posted 01 November 2020 - 02:31 PM

Wait, a strange Kemtron accessory I've never heard of?? Where do you find these things Rick? 

 

Excellent idea in fact, and it looks very good. 

 

Don 



#40 Martin

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Posted 01 November 2020 - 03:23 PM

Nice solution to the body mount pin tube U brackets, they look strong. :good:

 

Is the wheelbase still adjustable at this point or does the hinge hole lock it in to a fixed position?


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#41 dc-65x

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Posted 01 November 2020 - 05:54 PM

The wheelbase was fixed early on back at this step Martin   :) :

 

King Cobra Chassis (21).JPG

 

You know I like the weirdo old stuff Don.  :crazy:  In fact in my quest for a drop arm stop that didn't look like it came off of a rewound Mabuchi era "jail door" chassis, I turned to the old stuff for inspiration............a pile of vintage doodads, doohickeys and gizmos:

 

King Cobra Chassis (30).JPG

 

I couldn't find anything I liked for the task so I made something up on my hobby lathe out of 3/16" bar stock:

 

King Cobra Chassis (31).JPG

 

Now to solder it on the drop arm........


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#42 Martin

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Posted 01 November 2020 - 06:42 PM

I should off seen that. :wacko2:  Your slip joint is so clean it did not look soldered. :sun_bespectacled:


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#43 Isaac S.

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Posted 01 November 2020 - 08:35 PM

Don, I agree absolutely! I thought had seen most everything but I have not seen that!  :o

 

Rick, you teach me so much here is a thank you.  :good:


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#44 dc-65x

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Posted 03 November 2020 - 12:00 PM

We all learn from each other's builds Isaac. This is a great forum to build and share our projects. Here's that installed drop arm stop and my finished chassis:

 

King Cobra Chassis (32).JPG

 

King Cobra Chassis (34).JPG

 

King Cobra Chassis (36).JPG

 

King Cobra Chassis (35).JPG

 

It looks so simple but it took me forever to figure it out.  :wacko2:  :laugh2:

 

 


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#45 don.siegel

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Posted 03 November 2020 - 12:10 PM

Beautiful job Rick... as usual! 

 

I see what Martin meant by asking if you forget to solder the adjustable wheelbase part - really looks like no solder in there yet! 

 

And your drop stop looks very Art Deco! 

 

Don 



#46 Isaac S.

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Posted 03 November 2020 - 06:24 PM

Great! Looks really strong and that can be a very good trait. But also fairly light. 


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#47 Regis4446

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Posted 04 November 2020 - 04:41 PM

I like coming here, you see unfamiliar tools , slot parts that I have never seen elsewhere.

 

And in addition there are beautiful constructions and beautiful photos.

 

Thank you Rick for sharing


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#48 dc-65x

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Posted 06 November 2020 - 02:26 PM

Thank you guys.  :victory:

 

I've been a bit sidetracked but I'm back working on my King Cobra. I've decided on good old Russkit set screw rear and threaded front wheels:

 

King Cobra Chassis (10).JPG

 

For the front tires I epoxy bonded Revell Dunlop fronts and ground them to 1" :

 

King Cobra Chassis (11).JPG

 

For the rear's I'm trying Smilin' Ray's urethane repops of Russkit Dunlop tires (shown ground to 1.020" on the right):

 

King Cobra Chassis (9).JPG

 

I'm still waffling between Russkit Cooper and Monogram Scarab wheel inserts while I build up the roller........

 

 


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#49 dc-65x

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Posted 10 November 2020 - 12:54 PM

The roller is finished:

 

King Cobra Roller (1).JPG

 

King Cobra Roller (5).JPG

 

King Cobra Roller (4).JPG

 

The body is next.........


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#50 don.siegel

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Posted 10 November 2020 - 12:58 PM

Wowie Kazowie Rick! Nice shiny brass. After all that fun, now you have to pay for it by doing the body... 

 

Don 







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