Skil bench grinder needs a hand to start turning! 2

[judgedredd]

Hi,

I am new here, and very new to electric motors, so am not sure if this is an appropriate post for this forum/site.

I recently acquired a used Skil Bench Grinder - Model 287, Type 4, 1/3 HP, 3,600 RPM.

I was shown that the grinder, when switched on, needed to be helped in starting to spin by giving it a 'shove' or begininng the movement of spinning (sorry, I don't know the nomenclature yet), by hand. It started to spin slowly but after it got past a certain RPM it sped up to its operating RPM of 3600. Since I needed a bench grinder to convert into a polishing machine for some brass pieces I had made for a project of mine, I went ahead anyway and bought it thinking I could fix it later (since I am very good at fixing just about anything, if even with some online help or YouTube videos). If the motor is not helped in spinning up all that happens is that the motor makes a slight buzzing noise and does not turn.

Having worked with someone on his invention that used an electric motor, I do understand that there are some components that come with electric motors that cause the motor to start turning by itself, without giving it a 'helping hand'. I understand that a component or components has/have failed, but am not sure which ones. What do I need to look for in doing the repair myself? I could post pictures on the innards of the motor if required.

 

[LionelHutz]

Compositepro is right. The winding is burnt. I missed it scrolling through the pictures too fast.

 

[OperaHouse]

I've had those centrifugal switches just destroy themselves. When I have no other option, I just use a delay timer to make the contact for a while when power is first applied.