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Can't get that mirror image with lapping ?! - Page 2

post #11 of 23
Quote:
Originally Posted by Blowie View Post
I've been lapping for the past 3 hours and can't get the mirror image i see everone get's. I've been lapping in straight lines, but all i get is real fine scratches on the HSF. the grid isn't the problem cause i have 12000 grid (yeah i'm that guy with the crazy grids ! ).

do i need to lap in circles at last or what... cause i can't seem to get the mirror image.... or do i need to polish it at last and with what ?

any help would be much apreciated ! if anyone want pics then ask so cause i got enough

thanks !
Don't sweat your results. :-) Flatness is the key, not necessarily shine. This is can generally caused by one of several factors:

1) Technique. Straight or reciprocal motions will typically produce a higher shine than circular motions. I actually prefer to use a reciprocal motion instead of circular, but rotate the sink ninety degrees every 15-20 strokes or so.

2) Materials. To what final grit level are you lapping to? The best shines appear at 1500 and beyond (or 10-15 micron).

3) Time. Some people simply do not spend enough time on a particular grit level to completely remove the previous level's scratches. And it your 1000 grit paper doesn't completely remove the 800 grit scratches, the 1500 certainly won't. :-)

David
insulglass@easypckits.com
www.easypckits.com
post #12 of 23
Thread Starter 
rofl stop the easypckits stuff i'm in the NL so i can't get that here

well i've only been sanding in straight lines, think that is my problem. and the grit isn't the problem, i have up to 12000, so that should be more then enough. and i know i need to get an FLAT surface, but when you get mirror image that would result in more surface contact then when you have tiny scratches.

just give me a minute or 10 will be posting some pics !
post #13 of 23
Thread Starter 


this is after sanding 10 minutes with grit 12000, doesn't get any better then that
post #14 of 23
Quote:
Originally Posted by Blowie View Post
rofl stop the easypckits stuff i'm in the NL so i can't get that here
He's not trying to sell you his product, he gave you some really useful advice. I'm sure a simple "thanks" would suffice next time.
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post #15 of 23
Quote:
Originally Posted by Blowie View Post
rofl stop the easypckits stuff i'm in the NL so i can't get that here
lay off the guy, the easypckits thing is his signature, and he ships internationally so being in NL means nothing. I live in IRE and I use his kits.

Your technique is probably way off. What do you mean you are sanding in straight lines, have you been rotating the HS by 90' at every grit level? Have you skipped any grit levels? Are you using water? How long are you sanding for at each grit level? How are you checking that the surface is sanded flat?

The only way to get a flat surface is to apply even pressure consistantly on the HS while sanding, this is impossible for humans, so we need to rotate by 90' to even out this imperfection. You must not be rotating at each grit level, because you can see in the picture that there is beveling on one side and none on the others, which means you are applying too much pressure on that side and causing it to be sanded unevenly. Also rotating with each new grit is a good indicator to show you how even you are sanding because when you change direction all the sand lines from from the previous direction should be removed, if there are parts of the base where the original sand lines remain intact then the base isn't flat and isn't being sanded evenly.
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post #16 of 23
Thread Starter 
Quote:
Originally Posted by leimrod View Post
lay off the guy, the easypckits thing is his signature, and he ships internationally so being in NL means nothing. I live in IRE and I use his kits.

Your technique is probably way off. What do you mean you are sanding in straight lines, have you been rotating the HS by 90' at every grit level? Have you skipped any grit levels? Are you using water? How long are you sanding for at each grit level? How are you checking that the surface is sanded flat?

The only way to get a flat surface is to apply even pressure consistantly on the HS while sanding, this is impossible for humans, so we need to rotate by 90' to even out this imperfection. You must not be rotating at each grit level, because you can see in the picture that there is beveling on one side and none on the others, which means you are applying too much pressure on that side and causing it to be sanded unevenly. Also rotating with each new grit is a good indicator to show you how even you are sanding because when you change direction all the sand lines from from the previous direction should be removed, if there are parts of the base where the original sand lines remain intact then the base isn't flat and isn't being sanded evenly.
my mistake, anyway you can read it in the log i will posty later on. there i can tell you what was wrong and what not
post #17 of 23
as long as its flat it should work just as well as a shinny base
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post #18 of 23
Quote:
Originally Posted by Blowie View Post
rofl stop the easypckits stuff i'm in the NL so i can't get that here

well i've only been sanding in straight lines, think that is my problem. and the grit isn't the problem, i have up to 12000, so that should be more then enough. and i know i need to get an FLAT surface, but when you get mirror image that would result in more surface contact then when you have tiny scratches.

just give me a minute or 10 will be posting some pics !
NL = Netherlands? That's one of the top five countries I ship to on a frequent basis, generally every couple weeks or so. I think I have shipped orders to over 25 different countries so far.... the top five are England, Benelux countries, Australia, Singapore, and Hong Kong.

I would still like to find out more about the 8,000 and 12,000 grit paper you purchased. Did you see this printed on your paper? It appeared to me that it was a typo on the website you had previously posted when you ordered. I'm not doubting YOU, but rather the company that sells it as such.

If want a shine, I can get you the stuff to make it happen.

David
insulglass@easypckits.com
www.easypckits.com
post #19 of 23
Quote:
Originally Posted by Blowie View Post


this is after sanding 10 minutes with grit 12000, doesn't get any better then that
add some water 12000 girt is water sandpaper get the sand paper a little wet and it will help alot
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post #20 of 23
Brasso does a ton also.
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