MadRhino said:
Hammering a bearing is not recommended. You can hammer out the old one, but you should press the replacement.
You are right but that is ideally, be nice to always do things ideally but thats not the way things work out. For a more precise fitment, a press 100% but ebike cover not that precise.
If you dont use a lot of force and not pound on it hard and just use light taps going all the way around the bearing, using something softer then hammer head steel on bearing and it goes in should be fine. Ideally a press, but tapping it is fine.
Find a socket the right size is a common practice to use to hammer bearing in.
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Temperature
You can use anything, a big construction blow torch, a plumbers blow torch, a normal kitchen stove, a mini toaster stove, sometimes even just the sun heat, other times the time of day helps, even if you tarp an area and use btu heater, a little fire and place object next to it or in flame or in coals, place object on stovetop coils, place a brick in boiling water pot and object on brick so no heat shock, heck I bet even a lighter would do the trick for a small hub motor cover plate bearing. But in all honesty, you shouldnt need to take advantage of temperature. You also need to remember what exactly is made up of what you are trying to heat up/cool down. Different styles of bearings might damage if heated.
For making things cold. In colder climates just having the items outside in the snow over night or for days and days. Your kitchen freezer, your storage freezer, your garage beer fridge freezer, liquid nitrogen if you want to get fancy.
Warren said:
Wow! Thanks for the flashback. That is what we old machinists call a shrink fit. All you need it a hot plate, and a freezer above your 'fridge. Oh! And heavy leather gloves.