Best way to remove fisher price pinion???

[JB987]

Anybody out there know the best way to safely remove the 19 tooth pinions on this year's fisher price motors? The pinion remover sold by banebot sure doesn't do the trick!

[nparikh]

I would recommend not using a grinder or saw. We went to the mobile machine shop at Championships last year and they had to use the two because they didn't have a puller.

It did not end very well...

[AJ R]

Try using a nut splitter referred to in this thread about getting the pulley off of the large cim.

http://www.chiefdelphi.com/forums/sh...lley+large+cim

[Josh Murphy]

We use a pin that is slightly smaller than the shaft and then use an arbour press to take it off. It works real well for us, I just did some fisher price motors the other day and had no problems.

[jgannon]

You asked for the best way, and Dremeling certainly isn't it, but it works if you're careful. We succeeding in taking off a few pinions this way in 2006.

[Richard McClellan]

I tried using the banebots puller last night as well and after dremelling off some of the pinion teeth just to get it to fit, we tried the puller, and it just bent.

Next I tried using a drill press, and put the banebots puller pin in the chuck, and tried pressing out the shaft and the drill press setup was just not rigid enough.

Finally, I had to take the motors to the machine shop at school and use their arbor press, which did work since it was a more rigid setup.

But, while I was using the drill press method, I accidentally slightly bent the shaft on one of the motors. Anyone have a link or know how to buy more?

[MasterMkanik]

My method is just get a bigger hammer.

[MCahoon]

Originally Posted by Josh Murphy

We use a pin that is slightly smaller than the shaft and then use an arbour press to take it off. It works real well for us, I just did some fisher price motors the other day and had no problems.

How do you hold the pinion gear when pressing the gear off?

[MrForbes]

I used a hammer and cold chisel, split the gear in half lengthwise, very quick and easy. Support the gear on a big chunk of solid metal like the anvil part of a bench vice or a heavy welding table, put the chisel in the space between the two topmost teeth, and give it a good whack with a big hammer.

Needless to say the gear will not be useable after this operation.

[Cory]

Originally Posted by MCahoon

How do you hold the pinion gear when pressing the gear off?

See my previous post in this thread with the picture of the plate. Best way we've found to hold it.

[MCahoon]

Originally Posted by Cory

See my previous post in this thread with the picture of the plate. Best way we've found to hold it.

Cory: I very much appreciated your response in your previous post. It saved me the time that would have been lost in ordering the Banebots puller to find it didn't work (I had it in my cart on their site). I suspect the longer pinion gear is just too much for the hobby puller to handle. We have an arbor press, and your aluminum fixture would be a great solution, but we have to borrow machine shop time and it would likely take a couple of days to get built. The slotted steel plate looks like a workable situation that could be made with basic hand tools, though it doesn't provide as secure a hold on the pinion. Maybe after build season?

Squirrel: Your solution as well as the nut breaker would work. We'll need to do the same thing with an RS550 motor and plan to reuse that pinion, so need to have a way to remove them without destroying them. By nature I am a pack-rat and it seems like somewhere/sometime we'll have a need for a 19 tooth gear (I have boxes of this kind of stuff), so I'll advise not destroyinng it.

Thanks to all for the flurry of responses. I'll offer these as suggestions to the team and let them decide how they want to do it.

Martin

[Josh Murphy]

Here are the pictures of what we use to take the fisher price pinions off with. We made this out of aluminum.

[MrForbes]

That's a very nice gear puller!

[Richard McClellan]

Originally Posted by Josh Murphy

Here are the pictures of what we use to take the fisher price pinions off with. We made this out of aluminum.

Very nice! What's the thickness of the part that goes under the actual pinion? And I assume you guys have an arbor press as well? Or would a drill press work with this tool?

[Josh Murphy]

Originally Posted by richardmcc2

Very nice! What's the thickness of the part that goes under the actual pinion? And I assume you guys have an arbor press as well? Or would a drill press work with this tool?

We do use an arbor press. A drill press is not a very good option unless it's last resort. The actual part that goes under the pinion is made of steel(unlike what I said earlier) and the rest is made of aluminum(like I said earlier). The actual thickness that goes under the pinion is 0.085". This works really well for us.