So I picked up a big box of junk at a swap meet for bashing parts. In it was this loco nearly complete but hammered. Most notable is that it has the dreaded broken gear of death. Is their a replacement from Bachmann, Northwest Short line, Others? Anny one have one of these that has a good gear that they would want to part with the axle or at least the gear? I mean I could use the block I am sure even if I didn’t rebuild the loco which I probably wouldn’t. If not I can use the parts for bashes.
Are you sure it is the gear that is broken or is it the rear axle half joining tenon? I have had the tenon break several times on my old style Porters. There is presently no supply of this part that I know of. I have a new gear in my junk box if it is truly the gear that is broken.
Congratulation goes out to Joe Zullo for being politically correct!
Bachmann parts in a Junk Box! (http://www.largescalecentral.com/externals/tinymce/plugins/emoticons/img/smiley-wink.gif)
Sean,
I’ve also got other manufacturer’s parts in that junk box too. So what are you trying to say?(http://largescalecentral.com/externals/tinymce/plugins/emoticons/img/smiley-undecided.gif)
Here is the actual problem. I took two photos because the one sucks but included them both just in case.
Joe,
Not sure what you mean by axle half shaft. This has a solid metal axle with a knurled section for the gear to press onto. Interestingly so does the front axle but no in the same location. Is this for another application?
If I where to get another gear how does one take the wheels off the axle. I have decided I probably should know this. I have never figured out how B-mann puts them on. Never cared until now.
Sean McGillicuddy said:
Congratulation goes out to Joe Zullo for being politically correct!
Bachmann parts in a Junk Box! (http://www.largescalecentral.com/externals/tinymce/plugins/emoticons/img/smiley-wink.gif)
Be nice Sean,
I have a box full of B-mann junk future build projects. Hey speaking of that this isn’t the same gear as what came in an older 10 wheeler is it. I have those
Nope definitely not the same gear
Devon,
Your pictures are fine. They show what you have is a first generation Porter. What I described is a second generation. The axles and gears are different.
Your wheels are a press fit on to a splined axle end. You may be able to find a replacement gear for that one. I can not help as the gear I have is for a second generation. Sorry if I confused you.
Joe Zullo said:
Sean,
I’ve also got other manufacturer’s parts in that junk box too. So what are you trying to say?(http://largescalecentral.com/externals/tinymce/plugins/emoticons/img/smiley-undecided.gif)
We like Joe’s posts!
Sean McGillicuddy said:
Congratulation goes out to Joe Zullo for being politically correct!
Bachmann parts in a Junk Box! (http://www.largescalecentral.com/externals/tinymce/plugins/emoticons/img/smiley-wink.gif)
Now now, be nice.
NW shortline is a no go
I just 3D printed gears for my Bachmann trolleys. I have three (six axles) and five broken gears. The gears are cracked and have a broken tooth at the crack. New gear fits fine. It’s got 24 teeth and is about 20.x mm in diameter. If that’s what you need and you can’t find one elsewhere, answer me. I printed my out of PLA, but I’m looking for someone who can print a couple in ABS. Then I’ll mount them and see which operates better.
Dick thanks a lot for the offer but not the same beast. Mine is only 14.5mm in diameter and 16 teeth. But you did give me a great idea. I happen to know at least one person who would be able to print these for me and probably two people and neither would charge me a fortune. The guy who did driver centers and is working on an axle bushing for us could do this in his sleep. The wheels are abs but I know he prints in all sorts of stuff including some sort of metal I think. I also have a local high school tech school that does this stuff for the price of materiels if they decide to take it on. I pretty sure I understand sketch up well enough to even draw it up.
So this could be a real solution. Order twn or twelve of them and have a life time supply.
Devon, you may be able to find some brass tubing to fit around the hub of that gear. I’d suggest taking it off the axle and measuring the OD of the gear hub. Then see if K&S has any brass tubing with an ID that matches. This is a common fix for USA Trains axle gears, and while they have a wider hub, you should easily be able to slice a piece of tubing to press on over top of this. I once reinforced the hub of a Lego gear like that to drive an R/C car I built. Worked like a charm!
Later,
K
Here are photos of a complete wheel/axle/gear set and the Tinkercad design. The gear really is red, because that’s was the available color. It was easy to see on the workbench though! In Tinkercad, there’s a customizable gear file called Progear. It makes it easy to design gears. This one is PLA, but I’d like one in ABS to see how well they each hold up. I thought I’d put a PLA and a ABS gear in the same motor block to see if/when they fail.
The last picture is of a 16 tooth gear as drawn in Tinkercad.
Kevin,
I will give that a try as well. I messed with sketch up and I was able to produce the gear with dimensions I believe.
This is of course a 2d rendering of the 3D file. I want to go back and confirm it but this is what it looks like I believe. I am not so sure about the hard points onthe end but I do think the OEM gear is this way. Either way I would think it would work. This isn’t a swiss watch.
does that match the actual tooth profile Devon? Does not look quite right.
Greg
As I am writing this I think I might know one place where I went wrong. I might have measured the tooth face and recorded it as tooth depth if you understand my meaning. I more or less was seeing if I could design it in Sketch Up since I am just know learning that program. I will take the drawing and once again compare it to the actual gear.
I sent that 2D rendition to my 3D printer guy to see if he thinks he can make it. If he can do it I will get the gear off and really spend some time measuring it close. I need to see if the gear teeth are that pointy. I think they are but want to verify it. He got back to me and he can print in ABS or Nylon.
I know the wheel is pressed onto the axle, whats the bst way to get them off? At least one side so I can slide the gear off, and just for my own info how can you get both sides off.
Use external snap ring pliers to spread the wheels until one comes off.
Yes, I would revisit the tooth profile. They usually don’t have that kind of profile to them.
