THIS is Why Lapping Your Cooler is SO Important!!

I always lap my sausage before frying for best pan contact

I used to lap carbon seals for turbine engines. They needed to be FLAT considering this was hard carbon on stainless steel. If you want an even flat lapping, always use a figure of 8 pattern! A proper figure of 8, along with rotating the unit after a few laps, will self cancel out a ton of uneven pressure you may put on the unit.

Me building a PC: I need to be relatively carefull not to damage parts. Jay: So im grinding down my parts and throwing a c clamp to keep it together while using vaseline on my gpu

For what it’s worth, I’m loving this series

I love the extreme overclocking videos, theyre pretty entertaining

top tip, color the surface you're lapping with sharpie, this shows exactly where the high points are and shows clearly if uneven pressure is being applied before you go TOO far,

Very entertaining video Jay! Some perspective for those wondering about engineering accuracy; My work consists of CNC polishing optical glass, specifically in manufacturing bespoke camera lenses for the film industry. It takes roughly an hour for a specialist calibrated and optimised CNC machine to polish a 60mm diameter piece of glass to ‘plano radius’ or 'flat' within -/+ 3um (0.003mm) (Human hair is 70-90um). To the point where a pass/fail could be down to the difference in ambient temperature in the building or heat from your hands. I use hand lapping to get the piece somewhere near flat prior to machining, that can be -/+ 5-10um on a professional setup. I admire your optimism in your perceived accuracy but you are not anywhere near your alleged ‘few microns’ tolerance across a surface of that size using that setup. It can be achieved manually, although it would need a very expensive lapping plate, DTI’s and/or CMM for reference and a lot of time and experience to get close to those figures by hand. If you do achieve a near perfect flatness across two opposite surfaces (specifically metals) they will wring 'adhere' to each other with an amazing amount of force.

"Glass is perfectly flat" every machinist replacing their expensive granite surface plates with glass. Invest in a lapping plate.

When flattening sharpening stones, a common technique is to make a grid with a pencil and see how the pencil lines get ground off to see the high and low points

You sound like a TV chef talking about the perfect method to cook the meal.

Jay: Just one more LN2. Just one more... Everyone: Jay: I dOnT hAvE a PrObLeM i CaN sToP aNyTiMe I wAnT!!

Rick Sanchez - “you want to experience true level?”

Float glass may be “perfectly” flat, however, it bows like a crazy, especially thin glass. It can conform to the surface it’s sitting on potentially creating a concave/convex surface. I would use a thicker piece of glass or buy a certified flat surface considering that you’re going for precision applications.

Jay, theres this tape we use in HVAC that is like a tar thats extremely resistant to cold weather. I think you should look into that, and it dosent melt. I think it will help you tremendously.

Glass is “perfectly” flat. Go sit in front of a squared in mill for a little while with some glass. 😂

Pro tip: 1. When Lapping you move your part in figure 8 patterns on the sandpaper without lifting it (for even wear). 2. If possible use multiple sheets of glass on top of each other because glass will bend very easily and reflect defects of the surface below. 3. You can use a sharpie to check how evenly you are sanding the surface, just color the whole surface inbetween lapping runs and check regularly if paint remains. BTW you are sanding, lapping is one of the most misused terms.

Jay, a tip when lapping a surface is to use marking fluid or even sharpie ink as a way to see how much material has been taken off and how close to a flat surface you're getting. It's not only great for personal use but it's also great for the viewers pleasure. You would essentially coat the surface with the dye and then start lapping. The raised bits will have its markings sanded off while the lower bit will still be covered.

WE ARE NOT BURNED OUT JAY, don’t blame us! ;)

Jay: "...because tempered glass is perfectly flat" Me who's tempered glass: "No tf it isn't" Just get a machined lapping plate, costs about $30 or less and it's machined at higher tolerances than a flexible piece of glass.

Nice Job Jay. Damn near perfection and your results show it. I love how you mention that the flatness needs to be with in microns to achieve those results. It really voices the spectrum of accuracy needed. Proud of you!