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The joys of finer grits

crashtestdummy

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After finishing off with the 400 and being back to a pristine blank I started with the new 600 and everything went well until the first was off where I found a small skid mark(no giggles please) near the edge.not 100% sure how it happened as I had thoroughly cleaned the tile and mirror beforehand but there it was.20140627_112835_zpsb184591d.jpg

the scratch isn't very deep and doesn't really catch when you run a nail(finger) across the blank so I went and carried on for 1 1/2 half hour with the 600 to see if it would start coming out.Unfortunately the scratch didn't seem to lessen at all so back to 400 grit and after about 1 1/2 hours the blank is back to a great starting point.This time ive learned a few things with finer grit.irstly don't just wet the blank when starting off, also wet the tile tool too as this gets rid of most of the initial sticktion with finer grits.secondly on the first wet from a clean mirror I alwals sprinkly the grit onto the blank and spread it out with my hand for even coverage and I think this will really help avoid edge scratches with the 600 as I think a lot are caused applying and removing the tile tool.I don't remove the tool inbetween wets I just add more grit and keep going.This lessens the tile removal times from once every few minutes to once every half an hour with the way I do it.I then turn the blank half a turn,clean it off and inspect my progress then start again for another half an hour.hopefullythis technique will work as with the near 2 hours of 600 last time I only picked up a scratch at the very beginning and no others after using the new technique.

This afternoon I will thoroughly clean the tile tool, the blank,change the carpet on the grinding table and I even remove old grits to the floor and change clothes to avoid contamination.This will be really important when I come to polishing!!

On a non asto related note I have just bought my first bike in about 10 years as im going to be doing a job that's about 2.5 miles away from my house.20140630_085529_zps981a8a06.jpg

Its the first non mountain bike ive had since I was about 12 so its amazing how much lighter and quicker it picks up speed and also how bumpy those 700cx28 tyres are!!its not a mega expensive one but I looked at a few bikes and the boardman ones semed well specced for the price and I love the look of the thing.first ride out the other was 4 miles and I was averaging 16mph and topped 20mph a few times on the flat.I wasn't hammering it but making a good pace to me but my normal taking it steady average today was 12.6mph.luckily round here its pretty flat and has good cycle lanes so its perfect for bikes.Another job im after is 4 miles away so 8 miles a day will be a nice way of keeping fit and saving wear and tear on the car and if its really bad weather I have the car to fall back on anyway as I don't fancy 700c tyres in the rain.

hopefully another update midweek

one thing to note,now im living on the southcoast rather than west yorks I can see Sagittarius from my bedroom window.It never rose high enough to see from west yorks so when my scope is ready next year is going to be a new beginning with many further south objects in my reach.

clear skies Rich

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Hi rich,

that mirror is coming along nicely so keep at it. A 22 for your first grind seemed crazy when you first took it in but ive got to say your doing a grand job.

Having moved to the south coast though youre a long way from John Nichol if you need a hand but Im sure you'll manage.

Nice bike by the way, ive heard good things about boardman bikes but I agree with having the car to fall back on. But being in the south coast youre gonna miss the tour de france in yorkshire which is a shame as it looks like its gonna be a good weekend .

Keep grindin mate, but be careful of leaving skid marks ;)

Cheers

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The plan is to take it to john for final checking before it goes to be coated plus im in email contact with john if I get to a point im not sure about.I wouldnt have got anywhere near where I am now without John and also damian who is doing the other 22" grind.its been great to swap ideas and techniques.the figuring is the bit im not confidnt about. Tbh anyone with patience could get to where I am now.

Yeah would have been nice to see the tour winding through the dales :)

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The plan is to take it to john for final checking before it goes to be coated plus im in email contact with john if I get to a point im not sure about.I wouldnt have got anywhere near where I am now without John and also damian who is doing the other 22" grind.its been great to swap ideas and techniques.the figuring is the bit im not confidnt about. Tbh anyone with patience could get to where I am now.

Yeah would have been nice to see the tour winding through the dales :)

Firstly nice bike fella and well done on the job front down there, it looks like you'll be well away on that I wish I could ride to work but its a proper set of dangerous roads to get to my place of work.

 

Back to the grinding and nice to chat on the phone and work out where I've been picking up the silly scratches from. It's nice to finally see some polish on the surface and the blank nearing the final stages. I think your under estimating the progress you've made up to now Rich as not just anyone could get to where you or both of us are now (me with my scratches and chip and all that!) 

As you say it has helped both of us doing it at the same time as there have been plenty of times when morale has been lacking but we've kept at it.

 

Well done up to now and be nice to eventually have the scopes finished and side by side, but will like all three together eventually just for a few photos as it will be the only time they'll ever be together.

 

Keep up the good work and riding as its a great pass time I'll be able to throw the mountain bike in too now!

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yeah I definitely think those W strokes have probably been causing the scratches as ive only had that one sleek in 4hours of 600.We keep forgetting that we are still grinding novices and we are still learning all the time.Im glad im making my mistakes on this small mirror so when I do a big one it will be right :D :D :D

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