Hi there to everyone. First post here and is asking for knowledge on how to get out of a messy situation.
My T-4 has been left to its own devices, used by not so careful employees and most importantly, and in hindsight, used with a very strong tap water containing lots of scale that has left an indelible mark in the machine. Now I wonder if people who lives in areas with such a type of water uses bottled water to avoid these issues?
When I started fixing the machine my first trouble was getting the SG-200 grindstone out, as the ezylock was completely stuck and no standard procedure or pliers would unstuck it. As it turns out, I had to end cutting the plastic ezylock with a saw just to realise it won't come off because the grindstone was stuck in the shaft, like if the stone itself has grown and the tolerance between stone and shaft doesn't exist anymore. Eventually and using moderate force brute, I managed to get the stone out.
As you can see in the pictures the stone has a lot of color variations due to, I assume, limescale buildup. I try to wash it with clean water but it won't go away.
(https://www.dropbox.com/scl/fi/p5kf7fl44bhx4hknjlfyi/CDCE9E95-970E-4116-9440-84B8DE38AD3A_1_105_c.jpeg?rlkey=ihswtk34e7gp215l7lpczyvkl&st=rwb06cmm&raw=1)
(https://www.dropbox.com/scl/fi/f3cdbehlio924xhk49b4c/DED31F06-2F3B-4997-95F2-BEC530059921_1_201_a.heic?rlkey=jpvd7n33e4uv7ghhvvdh0qqcz&st=p66irgi6&raw=1)
-So my first question will be: what will be the best way to bring back the stone to an acceptable looking condition? Any known way to remove the limescale marks?
Moving onto the next issue, the machine head is also heavily affected by limescale probably beyond the possibility of bringing it back to the original state. The close ups look like remains of the titanic´s hull.
(https://www.dropbox.com/scl/fi/fnhn0aqumtgvjvn2ykedh/EF1B9508-E4F4-4678-9BDB-A428CDBDCC42_1_105_c.jpeg?rlkey=7u0irhck55ekssu5jopvz9z30&st=03jhwgvf&raw=1)
I disassembled as much as I could but information on how to remove the motor assembly from the head is scarce and I don't want to mess this. If anybody know how to take these two bits apart, it would be great so I can clean the head properly.
(https://www.dropbox.com/scl/fi/5kzfmcbx5chtwnpel6qwj/E109A030-C76C-414D-997D-28CF7926A9BD_1_105_c.jpeg?rlkey=qq4rel5ba7x7xmssbfgnhmlsi&st=n50je02i&raw=1)
(https://www.dropbox.com/scl/fi/1lbma1nn0z7u9ym7nxll8/C5C46514-F9D7-4840-9ED9-8D9729EACAFF_1_105_c.jpeg?rlkey=pqjma1ecxqxqzlm47c5wn4x0g&st=u8g01fph&raw=1)
I can´t find any retailers that have the head part for replacement although it has part number in the parts diagram. That would be the best solution if the price makes sense.
-Otherwise, what you guys reckon would be the best way to make this part look better that this sad state is in? I tried a bit if vinegar and sponge, but as the motor assembly is so close to it, it doesnt make the best setup for a deep cleaning. Maybe submerging the entire part in a de-scaler product + sanding?
(https://www.dropbox.com/scl/fi/zikfdgl5svlds0zhk0jeu/5E874B12-778D-4F74-9D03-FC10D3DB5FDB_1_105_c.jpeg?rlkey=vm132j7a4c2kgchhyjlk9meul&st=d3qxyy72&raw=1)
(https://www.dropbox.com/scl/fi/utnpugwuxcfvj6qmr21yr/FA94FD5A-7246-407D-8DE9-63C364934589_1_105_c.jpeg?rlkey=wxrgkf5nhl28hzpmdb6ddpi32&st=7znqi9eo&raw=1)
Please hit me up with ideas if you have ever experienced this problem with your machines!
Also, open to buy a machine head replacement if anyone has one laying around ;D
I haven't got any expereience with this on my T8 but limescale is easily removed by soaking in Acid.
Not sure if any of the parts you want to treat are OK to soak or not.
The time needed depends on the strength of the acid you may use and the amount of limescale.
Lemon Juice and vinegar all the way up to more potent treatments are available
https://www.dynapipe.co.uk/how-to-remove-limescale.htm