Here is a little GMF grinder unit – the 125mm Handy Grinder. Today I’m pulling it down for a restoration – let’s see what’s inside it!
The sticker was a little curled:
This looks a bit like the NSW authority sticker seen on other GMF grinders:
On the back of the grinder we can see the country of origin:
Also the model number of this particular grinder – it’s the catchy SG3A5A/2Q. 240V, 2 amps – so it’s about 480w input, no idea what the output is. Each end has a black guard held in by three screws:
Looks like there used to be some clear plastic shields held on by a screw above each wheel – long gone now:
The end caps removed:
I’d hazard a guess that these are the original wheels – you can see “Made Expressly For GMF Electric Motors” on the side.
The top half of the grinder is held on to the bottom by four screws – two hidden next to each grinding wheel guard:
Four bolts with washers:
The halves separated:
The back of the power switch:
It pulls out of the cover:
The bearing seat in the top half:
The bearing around the shaft in the bottom half:
A cooling fan:
The bearing on the other end with some washers:
The bearings look to have some felt around them – perhaps to retain oil, or damp vibration? There is a plate on the underside which needs to be accessed before the stator can be pulled out:
Closeup of the info:
Is that CRC Motors Pty Ltd? One screw holds the plate in:
Beneath:
Shaft and stator removed:
Lower half:
The grinding wheel nuts are removed with a 19mm wrench:
There is a circlip around the shaft:
The bearing removed:
Looks like the remnant of some lubricant on the shaft:
The fan end bearing has some shims on either side of it:
The stator removed:
The cases, emptied:
Post-cleanup:
Markings on the inside:
The cases are cast aluminium, the electrical plate on the underside is steel:
I had some silver paint that needed using – post-paint:
More to come.