How To Cut Lenses to Fit Your Frames
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How To Cut Lenses to Fit Your Frames

October 19, 2019


Today I’m going to show you how I cut a
set of sunglass lenses to custom fit into a favorite frame that I have. They used to be a set of prescription glasses. They were pretty pricey Pradas and I really wanted them to to be new sunglasses. It’s not like as a recovery diver that I don’t
have sunglasses. Some of them are actually really nice. But I really wanted these Pradas. So, I needed to pick a donor set. And strangely, these hideous Risky Business glasses had one of the better lens treatments on
there. So I decided those would be the donor lenses. So let’s go out in the shop
and see how this is going to happen. Now these are the Pradas with the original lenses still in there. And let’s pop these lenses out of these hideous frames so we don’t have to look at the frame anymore. And we’ll just set these aside. What we need to do now is we need to coat these with a protective tape. The grind process, obviously, is just going to send all kinds of material that could damage the surface of the lens so the tape is to prevent that from happening. Make sure you press it on real good so nothing can get underneath the tape. Once you get them both done, you’re going to find that it’s going to be easier to work with
if you trim off the excess. And when you’re finished, you should have a couple of lenses that look something like this. So now let’s pull these lenses out of
the Pradas. To pull lenses out, usually, you’re just going to press on the inner
lens like I’m doing here and pop them out. We’re just going to use a ballpoint
pen to trace the pattern. Now if you’re going to use the frames, you want to do the trace from behind. Fortunately I had the luxury of pre-cut lenses. That was definitely preferable for creating a pattern. So, just hold the lens firmly against
the donor lens to draw your line. Now I’ve got a trace pattern on there.
This is a clamp used for sheet metal. Now what I’ve done is just put furniture
pads on there for added protection. And I’m only going to use this clamp while I’m doing the sort of heavy grinding, while I’m trying to get really close to the
pattern line. Once I’ve done that, I prefer to hold the lens by hand while shaping it. And lenses have a 45 degree cut. We’ll get to that in a little bit. We’re using 80 grit for this process. I just found that it’s a good medium to use because it goes through the lens fairly quickly but still gives
you a little bit of shaping ability. So let’s get to work At this point I’m going to do the rest
by hand. It makes it easier to pause once in a while, take the original lens and
compare the two to make sure you’re going in the right direction. And it’s also easier to see where you need to remove additional materials. So I’m going to skip over a lot of this. You don’t want to bring it down to the correct size yet. You want to leave it a little too large because remember we have to cut that 45 degree edge. When you do that, the lenses will get a little bit smaller. So right now, the lenses are a little bit too big to fit into the frame and that’s what you want. So now we’re gonna cut that 45 degree angle so it’ll snap into the frame nicely. Again, I’m going to skip over most of that. But you can see I’m holding the lens at an angle. I’m going to do that from both sides. And what that does is, as you can see, makes it a perfect fit. Let’s try the other one. So there you have it, that is a good fit. So now we’re going to peel the tape off and see how things look in the final state. Okay well here’s the final product. So, now I’ve got my Prada frames back in action and I’m real happy with the way
this project turned out. I hope it goes as well for you. And if you have a favorite set of frames that you want to make sunglasses out of, or if you want to
share this video with somebody trying to do the same thing that would be great. I appreciate you guys watching and I hope you’ll subscribe.

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  1. You can delicately wipe the edges with the acetone to get rid of the white stuff left after grinding

  2. 我的教授彭乾鈞 有教磨鏡片 但是我還只會磨塑膠片 不會磨玻璃鏡片 my professor taught us to mill the plastic lenses but i still dont know how to mill the glasses lenses

  3. great vid thanks for this,gave me the confidence to try it with my prescription shades which were wrecked and saved me 100 quid + (used a buff wheel in a drill). amazing whats on youtube nowadays, thanks again

  4. Good job. I am an optician and what you are doing is pretty much the old school method of grinding edges. If I may add a bit of warning though. This will only work well with plano (no Rx) lenses as you need to have an optical center measured for your frames and a pupil distance measured for the individual when you start adding Rx, no matter how small. If you try this with an old Rx and a new frame you could introduce issues such as prism shift which can cause some fairly nasty visual distortions up to and including double vision. Even if you are not noticing the distortions right away you will be fatiguing your eye and making it work harder than it should have to for accommodation. Other than that, there is no reason at all to not use this method when you have some extra frames and no Rx lenses you want in them. A final piece of advice. if you grind them a tiny bit large and than use a blow dryer to heat up the plastic of the frames, you will be able to pop the lenses in and have a tighter fit that will have less chance of popping back out. I do mean SLIGHTLY larger. 1mm or so around the whole lens. Good luck!

  5. Awesome video– I order a set of eye glasses replacements and some how are a little to large / I will give your technique a try.. thanks alot for sharing

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