I’d been using my mini mill (Amadeal XJ-300) for around 2 years and all was fine. Then I pushed it a bit too hard and the spindle stopped rotating but the motor could be heard whizzing round.
I have read elsewhere that these milling machines have a tendency to gearbox failure…..
Before considering replacing the gears it is worth thinking about going straight to belt drive. A belt drive is so much better than gears and if you are worried about the cost you can quite easily convert to belt drive yourself as I found out. Read about the mini mill conversion to belt drive.
The manual that is supplied with the machine is not a lot of use – you need to just work your way through slowly and methodically whilst trying not to get worked up and do not apply too much pressure to any joints. A machine breaking part way through a job is a stressful time and can turn the best of us into gorillas with a spanner….
You can see here the head broken down into the major parts and the offending gear that has split into two.
You can also see the lever that has a fork attached to it to move the gears between high and low ratio.
The black gear is broken into more than two pieces.
There is a suspect white tooth here as well, which if you look in the image above you can see a missing tooth.
Again I imagine this does wear the gear.
Looking at other websites where people have had gearbox issues this gear has also failed.
And so rather than replacing the gears with plastic I decided on metal gears, from littlemachineshop.com.
After ordering these from the USA I then realised that I could have got them from Arc Euro Trade.
The milling machine all went back together easily and the metal gears were quieter than the original plastic gears. But then I decided to go further and make a belt drive system….