209 replies to this topic

[Dave Crevie]

I asked before but, I'll try again. Is there anything that goes in where the purple circle is? It's hard to believe that only one (1) screw{pink}is holding it on.

 

It looks like the rear section, behind the motor, is missing. Here's what it should look like;

 

 

 

Some versions may have had a single screw hole;

 

 

Complete chassis should look like this;

 

 

You can probably save the chassis by making a bracket from 1/32nd or 1/16th brass sheet stock. Something like what is shown in red. You could add piano wire stiffeners to reduce the flex;

 

 

 

On Home Racing World, a fellow named Chris Walker did a build of the Lola T-70 version of the Challenger kit, and added pans onto which you could add body pins if you wanted to go that way. (It's his photos I used above)

[Martin]

I also found chassis with the 3 holes in the rear.

 

 

[Mark Onofri]

Welcome back my friends
To the build that never ends.
Sure does look like a one time catastrophic stress failure to me. At least it won't affect the handling... when it's on the shelf.

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[Martin]

Yep, it done broke off.

[Dave Crevie]

Designer didn't stick to one of the engineer's basic rules; use fillets and radii wherever possible. 

 

 

The break on this side is farther back, but adding the radius on the other side would have saved it. The cut-out for the brush holder killed this side. The square cut-out on the bottom didn't need to go through the bend and up the side. All it does is clear the magnet plate, and make it easier to form the 90⁰ bend where the sides meet the bottom. 

 

[Mark Onofri]

We would be up 💩creek without a paddle if it weren't for these two (2) Jem's, wouldn't we?
PS: Dave, did you notice the edition #?

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[Dave Crevie]

PS: Dave, did you notice the edition #?

 

Nice collector item, but totally outdated as reference.  The book to have came from the Society of Manufacturing Engineers. It is no longer in print because it became too large. The Society now sells it in sections, 194 in all. Each volume completely covers the subject it is dedicated to. You can find those resources at;  https://www.sme.org/store   And if you really want to smarten up, you can join as an advancing student. I believe the dues are $45/year, and you get a WEEKLY newsletter that will keep you up on the latest process discoveries and happenings in manufacturing. Plus discounts on their publications. 

[Mark Onofri]

Thanks Dave. I'm pretty sure you have mentioned that before and, I haven't had a chance to pursue it yet.
I've been called "out dated" every time I tell people that I still race slot cars!!!!!😐

[Dave Crevie]

You are probably right. Sorry if I sound like I'm bangin' the drum for the SME, but there is a thousand years of making stuff in there. I was a member for over 40 years until I dropped out in 2015. I had already been retired for several years, and didn't think I would ever need it again. But old engineers never die, they are just worked to death.

 

Sometimes it does seem like slot racers are real reluctant to accept new methods and designs. It might just be that "Don't fix what ain't broke" mentality.

[Mark Onofri]

It's not having a closed mind but, somethings
1) wireless controllers
2) brushless motors
3) saved for another invention
Are absolutely Heretical. I was going to use playfit, falcon,etc. disposable motors as #3 but......it all comes down to
Now
And the
Nowness of
Change
I'm pretty sure I've spent enough time on this one. On to the next one.🤔 A Strombecker GT-40?