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  #101  
Old 20-06-2018, 08:04 PM
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Lognic04 (Logan)
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What the heck is this pit! It is the last major pit left after 320 grit??
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  #102  
Old 21-06-2018, 08:19 AM
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What the heck is this pit! It is the last major pit left after 320 grit??
Hi Logan

How big is it? Hard to tell from the photo. There looks like another smaller one off to its right. I can't tell you what it is. It does look unusual. Perhaps Stefan might have some idea?

If it's a one off and nothing else that size is there, I would probably ignore it. I would suggest you remove all pits the size of the smaller one I mentioned above.

But get another opinion before following my advice.

Rod
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  #103  
Old 21-06-2018, 08:51 AM
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It is quite small, unlike the photo suggests, and yeah it is a one off. I will do a few more wets tonight and see if it changes, if not move to 25u
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  #104  
Old 21-06-2018, 07:44 PM
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I reckon its tool bits flaking off - sealant around the edge.

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  #105  
Old 22-06-2018, 02:56 AM
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I reckon its tool bits flaking off - sealant around the edge.

OK so you have a small scratch. Has the previous apparently large pit changed?

I'm not sure I would blame the tool yet. More likely you have some contaminant in the wet - dust, rough section of bevel etc. Always look for the simplest explanation first. Check your bevel. Clean everything and check the powder when you add it with your finger tips. If you feel roughness, clean up and try again. It might also be worth working mainly mirror on top.

If it's only one small scratch I would leave it and move on but if you have many, you will need to go back to coarser grit to remove them.

Hopes that helps.

Rod.
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  #106  
Old 22-06-2018, 06:05 AM
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OK so you have a small scratch. Has the previous apparently large pit changed?

I'm not sure I would blame the tool yet. More likely you have some contaminant in the wet - dust, rough section of bevel etc. Always look for the simplest explanation first. Check your bevel. Clean everything and check the powder when you add it with your finger tips. If you feel roughness, clean up and try again. It might also be worth working mainly mirror on top.

If it's only one small scratch I would leave it and move on but if you have many, you will need to go back to coarser grit to remove them.

Hopes that helps.

Rod.
Thanks rod, there has been some construction in the area I work so maybe some wood chips got under? I will definitely work mirror on top for now as the FL won't change.The scratch seems to be fine so I will leave it and hope it grinds off with 25u
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  #107  
Old 22-06-2018, 06:05 AM
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And no, the pit did not change that much.
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  #108  
Old 23-06-2018, 08:08 AM
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Starting 25u alox! The scratch is shallow enough it *should* go away
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  #109  
Old 23-06-2018, 02:56 PM
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Back to 120 grit

WHY?!!?!!!!!!!?
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  #110  
Old 23-06-2018, 03:02 PM
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IIS is eating my images, but whats happened is something has given me an 11cm long scratch on my mirror, and it is very deep and wide ...
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  #111  
Old 23-06-2018, 03:36 PM
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IIS is eating my images, but whats happened is something has given me an 11cm long scratch on my mirror, and it is very deep and wide ...
Hi Logan

I am sorry to hear that. It's very frustrating after all the effort you have put in.

I noticed you said there was a bit of construction going on in the house. Perhaps a piece of dust got into your work. Did you hear or feel anything when it happened? Was it during a wet or just at the start?

Some people add a small amount of detergent (eg dishwashing liquid) to the grinding slurry. This can help stop grit clumping together. It's important just to add a drop. Too much reduces grinding action and you have suds everywhere.

Check your mirror bevel and your tool tiles carefully. See if there is any evidence of tiles chipping. I think this unlikely but check anyway. Are the tiles getting very thin?

I have some 240 grit. Send me a PM with your address and I can arrange to get it to you. Depending on the scratch depth you may be able to get rid of it with that.

When you get back to 25 micron remember that is where scratches are most likely. So it's important to take extra care keeping your grinding area as clean as you can. Scratches during polishing are less likely.

You have done really well maintaining your motivation. Don't let this discourage you.

Rod.
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  #112  
Old 23-06-2018, 04:33 PM
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Thanks for that Rod. It is annoying.
I made special precaution to move into my room, maybe that's got contamination? I also scrubbed the tool and mirror, and replaced the cover on the grinding stand. I think it must be from the tool? Some tiles at the edge have very sharp pointy edges. I didnt feel anything strangely enough! I also do use dishwashing liquid at the moment. I will check out the tool and report back.
240 grit would be great Rod!!! Thank you so much for your offer.
How come they are less likely in polishing? I would have thought that that work is so fine any scratches would pop up.
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  #113  
Old 23-06-2018, 06:26 PM
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Thanks for that Rod. It is annoying.
I made special precaution to move into my room, maybe that's got contamination? I also scrubbed the tool and mirror, and replaced the cover on the grinding stand. I think it must be from the tool? Some tiles at the edge have very sharp pointy edges. I didnt feel anything strangely enough! I also do use dishwashing liquid at the moment. I will check out the tool and report back.
240 grit would be great Rod!!! Thank you so much for your offer.
How come they are less likely in polishing? I would have thought that that work is so fine any scratches would pop up.
Hi Logan

Sounds like you are doing your best to keep things clean so that's great. I'm not really worry about the tile edges at this point. However you could bevel the outside ones if you are worried. I don't normally bother.

I am glad to help with the grit. It's not a large amount but I think enough for your needs.

During polishing you use a pitch lap which is much softer than glass or ceramic tiles. So rough material does not abrade as much. You can get problems with sleeks in polishing but let's leave that discussion for now.

Rod.
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  #114  
Old 24-06-2018, 07:19 PM
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Just bevelled the mirror and tool, and thanks to rod begun with 240! After 6 wets you wouldnt know a scratch was there unless you looked for the faint line of pits!
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  #115  
Old 25-06-2018, 06:39 PM
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Scratch is gone! On to 25u!
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  #116  
Old 29-06-2018, 08:11 PM
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Almost done with 25u! Should be able to finish it tomorrow, then 12, 9,5!
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  #117  
Old 30-06-2018, 11:43 AM
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Almost done with 25u! Should be able to finish it tomorrow, then 12, 9,5!
That's great Logan!

Take your time with each step and clean everything very well in between grades.

Rod
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  #118  
Old 30-06-2018, 12:38 PM
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I'm pretty sure i am done now - no pits out to the edge!
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  #119  
Old 30-06-2018, 01:33 PM
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Great work Logan !!!
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  #120  
Old 30-06-2018, 02:58 PM
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Thanks!
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