Can anyone enlighten me on how to remove the worn gear from the motor on an old Rivarossi 0-4-0T dockside?
If enought room is available between the worm and motor, I would try a NWSL puller. Put the V plate behind the worm and press the motor shaft with the pusher screw.
Jim
Like you say, I'm not sure there is enough room but I'll give it a shot. Thank you Jim
If there is 'not enough room' because the worm is pressed up close to the bell, make a substitute V-plate with a long relatively sharp taper, like a pickle fork for disassembling ball-joints, and use the puller with that to start the worm off the shaft.
Yeah I think the problem is the thickness of the walls of the puller. There is just not enough room to get it in there and have a straight line shot at the shaft of the motor
The closest item I see like I have is the Micro-mark #82392 gear puller. Although I do not know if it will work or not.
This is what I have ...but never used it on a Rovissie worm gear that I can remember. It is marked 'AMERICAN EDELSTAAL PIT BOSS'. a google search brings up AIRCRAFT PARTS/TOOLS, MACHINE TOOLS and COOKING GRILLS. I do not even know where I got it from. I may have had it for 40+ years. The threaded press rods from the NWSL #55-4 tool will thread into it also.
Is the motor toast?
If so, would cutting the shaft off as close as you can to the motor help?
Soo Line fan Is the motor toast? If so, would cutting the shaft off as close as you can to the motor help?
I was wondering what part the OP wanted to keep, the motor, worm gear or both?
I took a guess that it was to be a remotor job and needed to save the worm gear.
Yeah I was planning on a remotor. The motor is toast. I was going to try drilling out the four corners where it rivots together. I'm not sure but I may need the worm gear.
Well I got the motor apart enough to get set up to press the worm gear off the shaft. However the worm is absolutely not comming off. I even put it in the freezer for a coupler of hours and no dice.
If its brass, a little heat will expand it a few thousands of a inch. Brass is a softer metal and will expand quicker than the chrome plated steel shaft.
Even if the gear is steel, the heat will help.
Its also possible they used locktite and heat will also deal with that.
One other thing you can try, support the worm and use a shaft or tiny drift smaller than the worm ID and try tapping it off.
I don't think it's brass. I don't know what it is, it's darker than the shaft from the motor. I'll try the heat.
Well that didn't work either. I have a little butane torch for making creme brulee and applied some heat. No dice. Still holding strong.
You can tell if its steel with a magnet.
To get it off, you need more heat and more force.
Tapping it off seems to be your best option. the worm needs to be supported in a V or groove shaped plate. Something which does not flex or bend. If it flexes or bends, the tapping force will be wasted.
Then a smaller shaft can be used to drive the motor shaft out. If the motor shaft is 2.4MM, a 2MM can be used. If its 2.0, then a 1.5 can be used.
The smallest drift punch I have is 1/16 which is close to 1.5MM so you may need a smaller one.
Perhaps you have the right size shaft laying around. Or search on Ebay for stainless steel round rod.
I found a video of a guy doing the same thing. In it he makes a drift punch by grinding down a larger metal shaft in a drill press.
https://www.youtube.com/watch?v=-3RiZQwXfHM
Forget it! Uncle! I give. I've got a million more things around here to waste my time with more satisfying results. Thanks to everyone who pitched in with suggestions. Happy Trails!