how does MTH place the worm gear on the brushed motors?

It's pressed on the shaft, and I suspect some retaining compound is also used to secure it.

@gunrunnerjohn posted:

It's pressed on the shaft, and I suspect some retaining compound is also used to secure it.

do you know whats the commonly used worm and spur gears used on powered O scale cars? Thanks for your help. tryting to also replace the trucks on the train

Trust me when I tell you this,....they are pressed on with the same force that turns coal into diamonds,....😉.....in other words, they’re on there ....

Pat

Pat it right, I've already croaked one gear puller trying to get one off!

No glue or retainer, just pressed on.

If the motor is shot you can use a puller with a lot of heat. Enough heat that would destroy the motor. Then drill out the bore a few thousands so its a sliding fit on the new motor and glue it on. Sometimes there is room for a set screw.

Pete

@nycboy posted:

one of my motors was shot so i ordered another RS-365  DC brushed motor. The Shaft is about 15.6mm long however i do not knoow that much about gears, and i have no idea what the profile / teeth is for the worm gear and wheel gear. Did they glue on the worm gear to the motor? or was it drilled in? When i tired to look into the worm gear i didnt see any drills so i assumed perhaps they used very powerful glue? sorry for sounding a little out of it im not to familiar with gears exactly

How in the world would you consider this a narrow gauge topic?  It clearly is a discussion involving MTH so I moved it to the proper forum.

I have seen where they have a fixture that heats them instantly and then presses them on , they are usually on for good.

If motor is bad and you need worm you cut shaft off motor and press out remaining shaft.  Or have a fixture to support worm while removing shaft with press.  That is how I do it.  If motor is good and the worm is bad I cut a slot down the worm without going into the shaft.  Use a dremel with wheel.  The worm will usually split and press off easy.  Otherwise you damage motor thrust assembly.

Pressing on require solid support of the shaft at flywheel end to press new or old worm on.

Make sure you have a measurement of where the worm need to be seated.  G

@GGG posted:

If motor is bad and you need worm you cut shaft off motor and press out remaining shaft.  Or have a fixture to support worm while removing shaft with press.  That is how I do it.  If motor is good and the worm is bad I cut a slot down the worm without going into the shaft.  Use a dremel with wheel.  The worm will usually split and press off easy.  Otherwise you damage motor thrust assembly.

Pressing on require solid support of the shaft at flywheel end to press new or old worm on.

Make sure you have a measurement of where the worm need to be seated.  G

Do you know the profile of the worm gear and wheel gear?

They vary greatly.  Each motor comes complete unless a Pittman.  You measure it to know dia and length of thread section.  You measure flywheel for dia and thickness though not as critical as the worm.  G