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Gear pitch preference


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#1 chasbeeman

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Posted 08 January 2019 - 11:39 AM

Having limited exposure to the commercial world of slot racing, I am curious what makes 72 or 80 pitch gears a better choice?

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#2 zipper

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Posted 08 January 2019 - 11:54 AM

The most important aspect might be the wide selection of gear ratios - very important on Eurosports.


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#3 slotcarone

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Posted 08 January 2019 - 12:28 PM

Depends on what class you are racing.

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#4 Ramcatlarry

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Posted 08 January 2019 - 01:13 PM

Bushing axle/motor cars tend to have bushing wear enough to make long term use of 72 & 80 pitch gears impractical. They work fine in ball brering cars, but getting the mesh 'right' with 80 can be difficult.


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#5 Shooter7mustang

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Posted 08 January 2019 - 01:19 PM

Really depends on class, Retro racing 64,72 pitch arent really conducive to an in-line set-up. Be lucky if the gear last

an entire race. I think 48 is best for Retro but I dont know alot


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#6 chasbeeman

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Posted 08 January 2019 - 03:30 PM

Thanks for the input, sidewinder ball race gt12 chassis or JRL type, also eurosport both 1/32 and 1/24 would be my application. Trying to get the best "drivability" from a car with high power motors.

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#7 smichslot

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Posted 09 January 2019 - 02:24 AM

Generally speaking the faster the armature is spinning the easier the car is drive, as a fast-spinning armature is stabilizing the car.

The current trend in ES-cars is to run 72p-gears, using 5t-pinions.

That gives 5/30-5/31 on a 1/32F1, 5/40 on a ES32 and something similar on a ES24.  As usual you need the motor-axles ground down to 1,5mm.

 

Steen


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#8 W. J. Dougherty

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Posted 09 January 2019 - 03:58 PM

Stern, who is making 5t pinions? I assume they are EDM? How expensive? Thanks...
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#9 Ecurie Martini

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Posted 09 January 2019 - 04:40 PM

Full disclosure:  The following reflects my experience/preference for 1/32 scale cars, often in classes with (low power) motor restrictions.

 

My primary concerns are efficiency and smoothness of operation.  This typically leads me to larger pitch, 64 and up, gears.  These are carefully adjusted and then "run-in" with valve grinding compound.  Once the desired ratio is selected, the chassis will be designed/adjusted to accommodate the largest possible gear set to make the pinion gear as large as possible (a 5 tooth pinion is almost square - hard to get running smoothly)

 

Another criterion: noise - noise is energy that is not going to the rear wheels - if a gear set is noisy, something is wrong.  This is easier to judge with metal gear sets. A plastic crown or spur will provide some sound damping.

 

Durability - many of my builds are "proxy race" entrants - on the road without any maintenance beyond lubrication for months or even a year.  The best combination in my experience? steel pinion + brass/bronze spur or crown.

 

EM


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#10 smichslot

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Posted 10 January 2019 - 03:03 AM

Pinions

 

5-tooth 72p pinions can be had from S&K (Ukraine) or Horky (Czech) and both are EDM-cut.

They are expensive, but not more so than the other (80p) EDM-cut pinions. My guess is that other gear manufacturers (ARP??) soon will join the crowd.

 

As Pavel Flasig (Attan-Slot) was saying at the ISRA-worlds in Finland: "I'm sure the Championships will be won with a 5t pinion! Except Production!" He was right.

 

Steen


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