97 replies to this topic

[Prof. Fate]

Hi

Sounds like an arms race!

Fate

[mdiv]

"Arms Race" -

Looking good, Rick and Rodney, I love this thread!

-- Mikey

[dc-65x]

Sounds like an arms race!

NEVER GIVE IN



Actually, this is all fun for us. We share info and help each other out (mostly Rodney helps me!)

I plan on RAMming it home with my new PitRam XL706-500

[TSR]

Will it be RAM-wrestling, or...

[mdiv]

The one in the 222 looks "copper" while one arm is "dark red" and the other 3 are green.

Sir...SIR! What does this mean?!

Mikey Mikey bo bikey.

[dc-65x]

Will it be RAM-wrestling, or...

We "be battl'n" on the Blue King

Mikey,

You've got the big RAM 722 there....cool . That arm is huge....those motors are on our list but we're going with the Pittman diameter arms for now. So here's my next motor. It's a new in the box Ram XL500 that's a rust bucket because the factory soldered the spur gear on the axle and didn't clean up the flux:



Torn down into its pieces parts:



The armature is only .6 ohms vs. the Pittman 706's 1.3 ohms. I'm also going to use the nicely ground magnet. It's gauss reading is a little stronger than my Pittman magnets.

Here's the donor Pittman 706:



I'm still a little unsure if this will work because the RAM arm is .020" larger in diameter than the Pittman. I think it will work but we'll see.....

[boxerdog]

I built this a few years back.....pretty crude but it seems to fit in:

[boxerdog]

It's a resin body, dynamic chassis and an XL-500. Maybe with some additional effort it would be competitive????

[mdiv]

Rick, thanks for the nods. It's a 222...and the arms say "7-pole armature for 222". Not sure about the different color wires, are they different voltage ratings?

Dave - Looking GOOD!

-- Mikey

[dc-65x]

Not sure about the different color wires, are they different voltage ratings?

Could be Mikey. Mine are all brown wire, no green. Do you have an OHM meter to check the resistance with?

Nice car Dave. I was hoping to run an XL500 armature in my new Vintage Unlimited Class Pittman 706 (any brand vintage parts, rewinds OK, but must fit inside a 703 - 706 setup). I did a weekends worth of work on it including turning down the OD to fit the Pittman setup, truing the comm, epoxy and balancing.......the whole enchilada:



I even polished the air gap on the pole pieces:



When I buzzed the motor up on the power supply it was an absolute DOG . My other RAM XL500 I built a few years ago buzzes up great . Either it was a dog all along or I screwed it up somehow .

Hmmmm.....what else will fit in that 706 setup. Rodney keeps pulling hot rewound arms from back in the day out of his "Oakland Speedway Box" (pics of his newest Unlimited class car coming up next).

I have a need for speed. My RAM arm is screwed up, I don't have any period rewinds........hmmm......lookie at this arm:



It's an unbalanced, dual shaft Champion 26D. It's got a bit of CCW timing cranked in and measures .3 ohms. It's short enough to fit but is a little small in OD at .590". The Pittman arm is .620". That's a pretty big air gap .

I stuck it in the 706 setup, and turned on the power supply. It INSTANTLY heated up and started to stink . Then I remembered I hadn't reZAPPED the motor. It read only 150 on the gauss meter. Here it is after the reZAP of the RAM magnet I'm using:



Now THAT'S impressive . Back on the power supply it buzzed up great, drew less than 1 amp and barely got warm . The arm is already epoxied and balanced as good as I can do statically. I just cleaned it up, polished the stack, cut the comm, soldered on an 11T pinion and shortened the shafts:



The setup is all ball bearing. I'm using VBX bearings (I'm cheap) but I remove the shields and clean all the grease out (clean, finished bearing on the right):



I used RAM 426 brushes (cut to fit the 16D sized comm) and RAM 850 brush spring and plunger:



The finished motor:





That big air gap still worries me. It might be all RPM and no torque. I won't know until it hits the track. It sure sounds good on the power supply though .

[boxerdog]

Rick, the 26d shafts weren't loose in the .093 bearings??? That should be a killer setup. Maybe a neo chunk would cure the airgap issue.

[dc-65x]

Hi Dave,

Yes, I had to replace the 3/32" (.0938") bearings for the smaller 26D armature shaft. Back in the day SKF made "hop up" ball bearings for the then current motors. For this application I would use (if I had any vintage SKF ball bearings ) SKF 5/64" X 3/16" (.0781" X .1875") bearings.

A really close modern substitute are 2mm X 5mm (.0787" X .1969") ball bearings. It usually takes a "Duffy" to spot the .010" (the thickness of 3 human hairs) larger diameter modern bearing.

I'm hopeful the big air gap will work. The motor really sounds good on the power supply and it doesn't get hot. Neo's are a banned substance in our friendly little "Pittman Challange" .

I'm building the chassis now so I hope to test at Eddie's soon. Rodney has built FOUR cars so he's way ahead of me. I hope to post some pictures of his other cars here soon.....

[Tex]

I'm cheap too, Rick, and have used both VXB and Avid BB's. So, there's a c-clamp holding the shield in place? What did you use to remove it? Will a new Xacto blade do the trick?

[dc-65x]

Hi Tex,

Yup, the little C-clip holds the shield in place. Some C-clips are easier to get out than others. A number 11 Xacto blade works well to get under the end of the clip.

[dc-65x]

Rodney sent me pictures of his 3rd car he's built for this challange. This time he's using a 706 armature and magnets in a 705 setup like I did but with a twist. He wanted to use a different gear ratio than the side plates would allow so he made his own....with just a Dremel tool and file . YIKES, now this took some work!





Here's his finished motor:





He's made a 2-rail chassis with the rails attached to tubes soldered to the motor side plates. His motor is removable which is a good feature:







Here's the finished roller and the design drawing. Check out those cast wheels. I've never seen them before. Wonder who made them :



The body is a Lancer Mecom Lola painted back in the day by ?????





Next up is building a chassis for my Pittman 706 with a Champion 26D armature posted earlier.

Hmmm………A “Pitt-Champ 726D” perhaps

[Tex]

That is really a slick build; what ingenuity!

[Hworth08]

An interesting use of front wheel retainers!

[dc-65x]

Yup he's done some clever things on his chassis .

Time to build a chassis for my killer (hopefully!) “Pitt-Champ 726D”:



I REALLY like all the pin holes in my "Ricks Jig":



Everything is aligned and held in place for soldering:



The drop arm gets aligned and held in place too:



Here are some close-ups. The simple drop arm:



The motor brackets made from K&S sheet brass:



Brass washers reinforce the drop arm pivot tubes:



In honor of the new X-Man movie, an X-brace to stop twisting:



The finished chassis:





Time to screw the thing together and try in on my little home track........

[TSR]

The body is a Lancer Mecom Lola painted back in the day by ?????

I love how the painter left the roof clear for the driver to look at the stars...

[don.siegel]

Another beautiful build Rick, and Rodney's as well! Good original paint job too - was the roof ever clear on one of these cars?

Have you thought about something like a DynoCan arm in one of these Pittmans? Seems like it would be closer to the original size, non?

Don

[dc-65x]

Dokk, I really like that Lola GT too!

Hi Don,

One of the biggest problems I had finding an arm for a 706 is getting one with a shaft long enough on the back end for a pinion gear. The Dyno arms I had were a no go. Whether other MPC arms would work ?????

After running my 726D on my home track I'm very hopeful it's going to JET at Eddie's. At first it didn't have any brakes but I installed the heaviest of the 3 RAM 850 brush springs and then ZAPPED the grunt out of the setup. I remember it got pretty hot when I was soldering up the frame.

BINGO! We have brakes . Like I said I'm hopeful but a Blue King is a lot more telling than my little home track......we'll see .

Here she is:





She wants to do wheelies with all that punch so I've since added some lead on the drop arm and switched out the braid for REH "Cox" Super Soft.



Rodney and I are sticking with Pre-CanAm Series bodies. The first CanAm race was at St. Jovite, Canada, Sept. 11, 1966. I'll be running this Revell Lotus 30 body:



Onward

[Vittorio Coletta]

We have this car in our psssesion in venezuela with all pieces

[hiline2]

Here is my question > what has happened to all  these great builds I see here and else where / have they all ended up in museums or as hunks of discard or sitting in boxes or shelves ? I know DC65 has been putting some of his on epay (which I sheepishly bid on for a while) . 

 

Will Phillipe conduct a clandestine operation to recover the Venezuela treasure ?