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Lightened Parma crown gears


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#1 TG Racing

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Posted 21 January 2016 - 08:04 AM

Does anyone have pics they could post of lightened Parma crown gears?  I would like to see the "What and How" to do to these gears.


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#2 Bill from NH

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Posted 21 January 2016 - 09:11 AM

I don'i run retro, but I would envision drilling one of the two setscrew holes larger & grinding flats on the hub areas between the two setscrew holes. You aren't allowed to shorten the hub length. What isn't clear to me is whether or not you are allowed to drill holes in the gear's plastic. If you can, you might be able to use a metal spur gear's holes for a drilling pattern. Otherwise, the RGEO jig or a lathe's indexing head will work.


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#3 Noose

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Posted 21 January 2016 - 09:27 AM

You can drill holes in the plastic. You can reduce the hub size and flatten sides. You can sand the diameter and you can take off some of the plastic on the non-tooth side of the gear.

 

You CAN'T relocate the set screw holes nor reverse the hub in the gear.


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#4 Steve Deiters

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Posted 21 January 2016 - 09:34 AM

What Noose said.^



#5 Uncle Fred

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Posted 21 January 2016 - 10:52 AM

The lighter the rotating mass, the faster the acceleration........


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#6 Don Weaver

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Posted 21 January 2016 - 11:12 AM

.....and quicker braking (small difference tho it may be).


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#7 Brinkley47

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Posted 21 January 2016 - 11:30 AM

Courtesy of Muffin

Attached Images

  • 12509902_10156536412185145_603454770341444203_n.jpg

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#8 Noose

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Posted 21 January 2016 - 11:35 AM

Does that have the sleeve in it?  Doesn't look like it.


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#9 John C Martin

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Posted 21 January 2016 - 11:37 AM

How about backside --anything there?
Aluminum ? Nice

#10 Brinkley47

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Posted 21 January 2016 - 11:39 AM

Per Muffin, it has an Aluminum Sleeve. No pictures of the backside. 


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#11 Noose

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Posted 21 January 2016 - 11:57 AM

Ahh OK. Aluminum is lighter than the brass. Before Parma made the gears with the brass sleeves, and before C/R made the brass sleeves available, we did use aluminum IF you could cut the set screw notch and then get it into the gear without bending it.


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#12 Tim Neja

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Posted 21 January 2016 - 12:02 PM

WHY not move the set screw hole??  It's simple, and makes lightening the gear easier.


She's real fine, my 409!!!

#13 Noose

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Posted 21 January 2016 - 12:13 PM

It is not allowed. 


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#14 Uncle Fred

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Posted 21 January 2016 - 12:37 PM

Was the aluminum tube drilled out before installing? 


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#15 Tim Neja

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Posted 21 January 2016 - 12:41 PM

It is not allowed. 

I know that!!! I asked WHY??? 


She's real fine, my 409!!!

#16 John C Martin

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Posted 21 January 2016 - 12:48 PM

Just did a aluminum sleeve - easy to do using a 3/32 reamer and dremeled a notch for screw..
.2 gram lighter
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#17 Noose

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Posted 21 January 2016 - 12:49 PM

I know that!!! I asked WHY??? 

Because we said so.  Guys can drill holes and shave metal.  Relocating and tapping a new set screw hole is not something the normal racer can do.


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Joe "Noose" Neumeister
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#18 Uncle Fred

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Posted 21 January 2016 - 12:54 PM

When will hear "Oh no my gear broke!" for the first time?


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#19 The Number of

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Posted 21 January 2016 - 01:41 PM

GetAttachment.jpg

 

 

this is what you get when you allow set screw relocation.


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#20 Noose

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Posted 21 January 2016 - 01:56 PM

Thanks Bill.


Joe "Noose" Neumeister
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#21 Uncle Fred

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Posted 21 January 2016 - 02:00 PM

I have my bearings gummed by toothless Eskimo women to make them smoother........


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#22 Mark Wampler

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Posted 21 January 2016 - 02:43 PM

Because we said so.  Guys can drill holes and shave metal.  Relocating and tapping a new set screw hole is not something the normal racer can do.

 

Assuming you have a drill press, you can relocate the set screw.   I’ve ruined several gears in the process.  I don’t recommend it.  Bryan has the setup and experience.  BP racers only!


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#23 Noose

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Posted 21 January 2016 - 03:13 PM

I don't have a drill press, don't want one and more than half our racers don't have one.  Ruined is the magic word.  LOL
By the time you go through all of this you might as well buy a Red Fox or Koford gear.
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Joe "Noose" Neumeister
Sometimes known as a serial despoiler of the clear purity of virgin Lexan bodies. Lexan is my canvas!
Noose Custom Painting - Since 1967
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The only thing bad about Retro is admitting that you remember doing it originally.


#24 jimht

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Posted 21 January 2016 - 03:35 PM

The latest Board postings regarding the various Retro Rules Sets indicate The Peter Principle applies to rules as well as management.

What happened to "KISS".

:dash2:  :D 


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#25 Rick

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Posted 21 January 2016 - 04:38 PM

With Noose being in such a generous mood, maybe the right time to ask for tape on the bottom?...........


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