Palm sander This sander has started making allot of noise and vibrates uncontrollably.

Buying something with serious money and using that to your advantage may not always meet the same fate. What would happen if you got yourself a pricy palm sander but couldn't get the job done after spending a considerable amount of time and efforts? That's the result you, for sure, want to avoid. Learning the method to properly use a palm sander can help you avoid such a consequence.
Here are the steps you have to master to use a palm sander efficiently.

TURNING ON THE PALM SANDER

You have to know first to switch on the power button of the sander to make it run. Otherwise, you won't be able to work with it as a sander of wood.

MANAGING SANDPAPER

You have to manage sandpaper and make it into pieces as the palm sander is small in size, and its pad can accept a quarter of the regular sand paper.

KNOWING THE CAPACITY OF THE SQUARE PAD

The square pad of a palm sander can accept the quarter of regular sandpaper. So, cut it into pieces as needed. After making the quarterly pieces of a regular sandpaper tie tightly with the sanding pad.

CARING ABOUT SAFETY

It may sound much that may harm your ears. So please ware the ear sound protector for the safety of your ear. Also, you can use glass for the safety of your eyes but it's not urgent.

CATCHING THE PALM SANDER

Before using as woodworking tool, you have to catch tightly the handle of the palm sander with a hand and another hand will give pressure on the sander for working well and maintaining the center of the work.
Now, the sander is ready for using. When the sandpaper will be needed to change, you have to change it following these steps:

• Remove the used sandpaper from the sanding pad
• Manage a regular sandpaper
• Cut quarterly or as per it needed.
• Tie the cut sandpaper tightly with the sanding pad

Collecting the accumulated dust In time of sanding the wood, you have to notice the dust collecting hole. When the dust collecting hole gets full, you have to clean it to sand well.

DETERMINING THE DEPTH

Before using the sander on the wood, you have to fix how deep it will be sanded. If you don't do it, you may not get a successful sanding on the wood or it may damage you wood making much deep than your need.

• After using the sander, please keep it in a safe place for further usage.

It is common that you want the utmost benefits from your palm sander. But, having the highest quality sander does not ensure that you would get the most of it. You need to understand how the machine typically works. To be more precise, you should learn you can use a palm sander.
The above guide is designed to help you with the steps involved in the proper use of a palm sander. Hopefully, the steps are understandable enough.
Source: Learn The Professional Ways To Use Palm Sander

Only real way to find out what is wrong is to open it up on this one. They are mostly plastic parts and you will probably find the broken part or where a gear is worn out.

You may have to lift the lid and rebalance the wet clothes inside
make sure that the machine is level and the bowl supports or in good condition as an off level bowl will go to unbalance on start of spin

depends whats wrong with it.they r basically all the same inside.,motor,armature,tiny brushes,two small roller brgs,eccentric drive to vibrate the pad,on/off switch

dont know

Yes, I am on my 3rd one. Your machine has destroyed itself, and must be replaced. Sorry about that. If you choose to do so, you can take it apart and see what I mean. ( I fix these).
Be blessed..

Highly unlikely the armature would warp. Both front and rear armature bearings would be my first guess.

the motor is not working anymore.. send for servicing.

you have a bearing problem, I would check the lower bearing first by removing the platen assembly, then try and run the motor without it. If you still have a problem then it is the armature bearings, but start with the eccentric bearing

Belt sanders: Belt sanders are useful for removing large quantities of wood stock quickly. They are generally used for rough sanding before fine finishing with a smaller sander. Palm sanders: Palm sanders are ultra-portable and useful for finishing small projects. Orbit sanders: Orbit sanders are usually more heavy-duty than palm sanders and appropriate for larger projects.