1441 replies to this topic

[Dominator]

Actually JK makes 64 pitch crown gears. Not sure of the number of teeth range but I believe a 30 is the smallest. The problem as mentioned before, hard to mesh with leaving the pinion on the motor shaft.

[Joe Mig]

This little JK gear is really 72 pitch, it is misprinted on the package. Take a look. I wasted three of them till I saw THIS.

[MSwiss]

I doubt if you'll ever want to go lower than 7/29 with the type of motors we run so I'm not sure why you would need more options than what's available with 48P.

Right now,the selection in 64P crowns is quite limited. Three or four months back, I looked into doing some 64P crowns. My head spun at the cost of doing one size,l et alone a full selection.

Since then, I've come to realize how good the 48P Parma King Crown is. The large pitch size allows motors to run hypoid and still mesh smoothly. That 48P size also helps cover up if you get one that is less than perfect.

Also the larger tooth allows for less than perfect adjustment and is less susceptible to impact damage. I ran my Red Fox F1 car for a few years and never lost a gear despite never running a wire loop/gear guard.

I think worrying about using 64P gears in Retro is trying to fix a problem that doesn't exist.

[Ron Hershman]

The only problem that exists is using a "reducer" with 3/32" axles.

[Roger Schmitt]

We use the JK 64 pitch plastic gears in our 1/32 F-1 Eurosport cars. They mesh well with a 72 or 80 pitch pinion. When set up correctly they are whisper smooth. I guess if they are strong enough for a tamed-down cobalt motor they should handle a Falcon motor with ease.

I have 29 thru 32 in stock, and also have the Sonic bronze gears as well (these work well with a 64 pitch angle pinion)

It just gives you the chance to run a bigger spur without hanging below the chassis like a 32 tooth Parma would.

If you need them they are in my webstore here
Mid-America 64 pitch crown gears

[Bill from NH]

Tore told us how to take care of that problem. Here's what he said,

Beautiful, Larry! Is that a Slot.it gear? You may be better served with a 1/8" Parma gear. I witnessed one competitor go thru two of 'em two races ago. All yous guys need to do is plug Parma gear with 1/8" aluminum rod.

I stole some 1/8" welding rod from Bryan Warmack's fabrication shop, red Loctited it, and let it dry overnight. Then machine or file flush with gear. Here comes the important part: you need access to a small lathe with small chuck in tailstock. You will also need a 0 or 00 centering drill. Now simply tighten gear in chuck (make sure it runs true) and put the centering drill in tailstock chuck and have at it. When you have sanoly center-drilled gear with a #43 or #44 drill, make sure to use a few drops of oil. Now you need to chuck up 3/32" reamer and ream her out. With #37 drill, use small drill press and drill out gear for set-screw. Get a 4-40 bottoming tap and ram her in.

After you are done, you will have a big smile on your face, and after you stoke on how true she runs, you will be even happier I know everybody sleeves gears with brass tubing, but I find this method works better.

[Ron Hershman]

I have 29 thru 32 in stock, and also have the sonic bronze gears as well( those work well with a 64 pitch angle pinion)

Roger,

What is the outside diameter of these gears???

[Ron Hershman]

The perfect fix from Tore... how many racers have access to this type of equipment to do this???

[JerseyJohn]

Or... 1/8" brass tubing. Notch it with a Dremel, clean it up with a file, insert in gear, Dremel ends flush with gear. Clean up burrs and go racing...

[Roger Schmitt]

What is the outside diameter of these gears???

I'll let you know in the morning when I get to the shop.

We run .620" tires on the 1/32 F1 Eurosport cars, and the gears can't hang below the chassis, so I imagine .590" or so.

[Joe Mig]

GT1 was supposed to come out with 3/32" axle crown gear in 48 and 64 pitch. They said some time late Jan or early Feb '08. Whatever happened? I think people should start emailing them!

info@gt1raceproducts.com or 336-629-7668

GT1 Race Products

[Ron Hershman]

I just had an email from Gil at GT1 and he is awaiting samples.

[Rick]

I agree with Mike Swiss, don't fix something that ain't broke...

[slotcarone]

Well said, Mike - I agree 100%!!! - especially your last sentence!!!

[Joe Mig]

I just had an email from Gil at GT1 and he is awaiting samples.

Hi, Ron,

I hope so. This is long overdue.

[Bill from NH]

The perfect fix... how many racers have access to this type of equipment to do this???

Any race group worth its weight in salt ought to have at least one machinist in it or a home hobbyist with a Sherline, Unimat, or other small lathe. If not, let them run 1/8" rear axles.

[TSR]

Tore said:

Then machine or file flush with gear. Here comes the important part: you need access to a small lathe with small chuck in tailstock.

Tore uses my small EMCO lathe to do this, but I must say that lately, he has been good enough to clean the mess after using it, so kudos to Tore!

I used one of his modified Parma gears on my F1 in Montgomery and the car was quiet and fast.

[Larry Mattingly]

Any race group worth its weight in salt ought to have at least one machinist in it or a home hobbist with a Sherline, Unimat, or other small lathe. If not, let them run 1/8" rear axles.

Bill,

Kind of an elitist attitude...

The last time someone made a remark like that it caused an entire government to come crashing down...

LM

[TSR]

You mean, Italy?

[Noose]

Gee... I thought it was California.

[TSR]

Not yet but sooooooonnn...

[Bill from NH]

Kind of an elitist attitude...

Not elitist at all! Even before I owned a lathe, I could always find someone who would turn things down for me. My first set of jig wheels were turned on a belt driven lathe by an 85-year-old man. I asked for a tolerance of 2 or 3 thousands, they came back with a tolerance of less than 2 ten-thousands.

Since I bought my lathe in 1969 or 70, I've been the "go-to guy" in my circle of friends whenever they need anything turned, be it slots or otherwise. I might barter my services but I've never taken any money.

[Larry LS]

Well, I have done the 48 pitch Parma and a few true Cox gears with the aluminum plug deal and it does work better than brass tubing. But a lot more work than the use of the Slot.it gears.

With them I just have to drill out the small set screws threads they use and drill all the way through the brass hub and tap for 4-40 set screws which I have in abundance here. This way if a screw or thread fails I can put another one in the tapped opposite hub hole.

I have been using them in my 1/32 cars for years with no failures and only one failure in my 1/24 D3 cars. They get used weekly here. That failure was with an old one that got hit very hard in the rear and chipped a tooth. It still ran but sounded bad, I so changed it out. I can't knock them a bit if set up right.

[TSR]

Larry, the Slot.It gears only mesh well with the brass Slot.It pinions. Put a such a pinion on a D3 motor and it won't last the race without each other chewing themselves to smithereens. I know because I tried. I used a 2-56 screw insted of the 4-40 because that's getting too close to the edge of the hub in my opinion. The pinion simply took the teeth out of the crown gear, which returned the favor and chewed the pinion big-time. Simply too much torque. Works great with earlier FKs and Slot.It motors.

So I stick to the Cox or Parma crowns modified with the slug and machined on my EMCO, because they can use the treated-hardened-steel angled pinions that not only last but can be used for quite a few races. In fact I have been using the same Parma gears in all the cars for just about two years now and LOTS of races... And they still look pretty good.

[Larry LS]

Sorry, Dokk, but you screwed up somewhere. Those 2/56 screws are not hefty enough. I have used them with the Falcon 7s and and one of your TSR motors for the last three weeks and no even a twinge from the gears. I even use them with the PS Puppy Dog motors.

And yes, I use the Slot.it pinions as they are the right pitch for them. And mine get raced every week here locally not just once or twice a month. Only one failure with a gear that also ran in a car at the last Las Vegas convention in 2004. It finally got a chipped tooth from a rear end crash and it still ran, just was too noisy for my taste so I ash-canned it. I use them from 27-30 tooth with 9 and 10 tooth pinions. The 8ts are not as smooth though. Horses for courses and I have run them the times I was down at BP for the Can-Am a couple times on the Hillclimb and the King.