146 replies to this topic

[Dooner]

Once again, superb work

John in post # 38 mentioned:"It may be difficult to find period korrect hypoids, but they were used at the time, so why not do it again?" End quote.


Dooner to Pablo: The rear view shot on your post #100 shows off the nice brass.
I think the brass hypoid gears would compliment the brass on the chassis very nicely. I have a set of hypoid gears on an old 1965 Ferrari F1. They still mesh perfectly, and run as smooth as silk after all these years.

[Pablo]

OK Dooner, I think I understand you now. I originally thought you were suggesting the need for "hypoid" to correct a situation where the horizontal height of the motor shaft was higher, or lower, than that of the axle. (Which is not the case here) Now I understand you are suggesting it from a purely smooth gearmesh standpoint, and it makes sense.

When you mention "hypoid" to an IRRA/D3 retro builder, it means something other than good gear mesh
My bad. You are 100% right, the car would benefit from smoother gears. Also, tighter oilites. But it is what it is.

I'm just amazed at how well it does handle with no flop.

If I ever decide to get serious with it, I'll install Slick 7 bushings, Falcon 7 or TSR motor, and a Pink Parma crown gear.

Thanks Tom.

[Dooner]

Pink is not a serious color for a gear. Why did Parma ever make those ridiculous looking gears?

[Pablo]

1. All men secretly LOVE pink. Most are afraid to admit it.
2. There has been lots of discussion on dyeing guide flags, why not dyeing a Parma crown ?

Dooner, post a photo of your 1965 hypoid gears. But, I'll warn you, I need to put this car in the box, and move on.........
If I happen to find a perfect set of brass hypoids for this car, I'll install a new Falcon 7 motor, Slick 7 bushings, and polish the axle

[Dooner]

I love when my wife used to wear her pink nighties. Do you think she would be jealous of these tires?

[Bill from NH]

Why did Parma ever make those ridiculous looking gears?

So us old guys can easily find them when we drop them on the floor! Have you dropped any screws, pins, or arm spacers lately?

[Dooner]

No, but I think I have one loose.

[Pablo]

Tom, that car really turns me ON
I get your point 100%

Hey Bill, dropping stuff on the floor is a whole 'nuther topic I have a Tupperware container full of dropped mystery stuff.....

[havlicek]

Once again, really nice job Pablo! It all "works" really nicely as a package and I bet it works even nicer on the track!

-john

[Hworth08]

Those are bevel gears, no hypoid. Hypoid gears were made, by MDC maybe, back in the day.

Like the pink tires!

Actually, most of the inline cars do use a beveled pinion, it's just called angled now.

[Dooner]

Don,
Glad you like the tires. I am not trying to be difficult here, but doing a Google Image search it seems many interchange the term Hypoid and Beveled. Below is one example of what I came up with when I typed in Hypoid Gears. Seems from the second picture that hypoid gears have more of a twist to the teeth and the pinion comes in at an angle below the center of gravity. I guess my gears are just beveled. I was misled by the internet.


New pic

[Pablo]

As the diagram shows, a "hypoid" setup would be used where the motor shaft needs to be below the axle.
Not the case here, which is why you confused me in the first place.

[Dooner]

Munter has more technical knowledge than I do. I am flattered, but can not take credit.

I believe the slotit offset(hypoid)gear gives a benefit of 1mm lower for the motor postion.
The only other hypoid I've seen is a Strombecker and its huge.

Below is a quote which is in harmony with Munter's post:
As the centre height of the crownwheel is fixed by the wheel height, this allows the
propshaft to be lowered relative to the car body, giving a clearer
floorpan and lower centre of gravity for better cornering. Hypoid
bevels are now universal in this application.

Because of the sliding contact that hypoid gears make, their
hydrodynamic contact pressure is higher. To be suitable for use with
hypoid gears, a lubricant must be capable of resisting high pressures.

Oils with "EP" ratings (Extreme Pressure) such as EP90 are required.
Some brands describe themselves as "hypoid" instead, a term which is
synonymous with EP. GL-5 is a formal API standard for this type of oil
(comparable to MIL-L-2105B/C/D)

[Pablo]

Centre
Tyre
Blimey
Makes me hungry for Fish N Chips and an Extra Pressure Malt.
Where is Munter when one needs him ?

[Bill from NH]

Ya forgot portside & starboard!

[Pablo]

Ay, matey, bring me my rum. Blimey, what have we to larboard, but a sailing wench in red cloth. Hypoid or not, aim for the mizzenmast, fire away ! The pistols, away, you heathens !

[tossedman]

Centre is how we spell it here yer honour.

Todd

[dbs]

Centre
Tyre
Blimey
Makes me hungry for Fish N Chips and an Extra Pressure Malt.
Where is Munter when one needs him ?

Ha! I missed the "centre" completely. It was the "crownwheel" and "propshaft" that
caught my eye.

Visions of two blokes in tweed jackets and caps examining a green Lotus.

[Pablo]

Smoking pipes and drinking dark, thick ale in a dim castle

[Hworth08]

The reason I have such "great" knowledge of hypoid and bevel gears is that I once used a hypoid gear when the 16D motors got faster than a 36D. Way too long ago to remember if the 36D frame was a good one (probably a space frame) or if I was just looking for a quicker way to try a 16D.

I also had the two Atlas F-1 cars that used the beveled gears. Auto World secured the leftover Atlas inventory and sold those cars for $3.50 each. If I'd only known...

[Prof. Fate]

The reason I have such "great" knowledge of hypoid and bevel gears is that I once used a hypoid gear when the 16D motors got faster than a 36D. Way too long ago to remember if the 36D frame was a good one (probably a space frame) or if I was just looking for a quicker way to try a 16D.
I also had the two Atlas F-1 cars that used the beveled gears. Auto World secured the leftover Atlas inventory and sold those cars for $3.50 each. If I'd only known... :laugh

Hi

The hypoid shown has a spiral cut gear face which is not useful in slot cars. THAT set up works on full size cars as it won't let the car roll backward when parked on a hill.

There were offset gears in the 60s which had straight 48 pitch faces but offset. Tradeship made bevels in that condition.

My survivors were all built around the 16d. Though there was a brief fashion when it was discoverd that one could fit a 26d in the BRM H16 body. The stock 26d was hotter than the stock mabuchi 16d of the period.

HOWEVER, Buena Park had several cases of new in the box Russkit 22s if you want to really go retro.

Fate

[Pablo]

Thanks Rocky

This car is in bed, with Cox crown. RIP.

Straightcut gears make more noise, but transfer power more efficiently