Very nicely done . I'm not sure why , but l like the simple design of this tool . I think it's the uncomplicated way it can be set up . It may also just be that l'm old , and this was the way tools were made when l was younger .🤗
New grinding wheels would not have been a luxury.. Those ones are pretty used up... And replacing the spindle's bearings while the thing was taken apart would have been a good idea...
All the way through I was thinking this machine would be ideal for polishing, and saying to myself "Don't put the covers etc back on." Sad when you did, amazed when you did just what I thought. Well done on an excellent restoration.
There are two holes on the top of each protective casing. I think there were hinged protective shields made of plexiglass or polycarbonate on a common axis. Then these shields were removed and they are lost. Good job, of course. PS.: Oh, in the new use it is not relevant.
A couple more coats of paint on the base would have been better - you can see through what is there. I hope you put clean grease in the bearings before you re assembled it.
Nice restoration and I like the design of this grinder. It is cleverly made with sheet metal pressings, which is easier to mass produce than castings. What is the brand or manufacturer please.
... if you have the means (tools and new bearing$). And there's a need. Sure. However, the design of the grinder tends to prolong the life of the bearings by introducing a large distance between the grinding wheels, when installed, and the entrance to the motor housing. The bearings are likely in good shape. The start cap would be more of a concern, I think, given the age of it. However, the grinder does seem to start quickly.
Also, for reasons of economy, you might consider hanging balanced, roughly-circular items from fishing line (or similar) in such a way that you can wind up the multiple strands a few turns, in order to have the item being painted spinning past the paint spray nozzle's position. This can given you a greater degree of control, depending on how you work things. Longer lines will produce a slower average spin, for example, but there will be variation in the speed of the spin in any case, as the item will eventually stop spinning and reverse direction... Tools are a contagion.