Resurfacing a Copper lap with a Saw Blade

Caution: Use this technique at your own risk. This is a traditional technique for preparing copper and tin laps. Today with modern lap alloys such as a BATT it's not necessary to score like this though I still find an improved speed on a scored BATT. On a copper I don't find it possible to use without scoring and impregnating the lap as you can watch in the video.
Sorry for the quiet audio on this one.

[@janhachicho3373]

thank you so much for your information and for your time. very nice of you.

[@vandiemenadventures]

Awesome video mate

[@simonsimonian563]

Amazing!

[@deborahduthie4519]

Every stone.💎

[@marksgemfaceting]

After watching your channel and being inspired, I have taken delivery of the Sterling machine and have cut a few gems. Loving it, can you give some polishing hints as to what revolutions the copper and zinc lap should be used at and what’s best to use as a polishing compound, how hard or soft to push the gem.

[@JustinKPrim]

I almost always polish around 900rpm unless I’m using oxides in which I slow down to maybe 200-300.

[@constantindanieltira]

Where you can buy the diamond powder ? Thanks

[@JustinKPrim]

Many places. World jewelry tools, diamond tech, Sachi. The best kind is from Switzerland Van Moppes but it's also the most expensive. Mostly I use diamond tech because its local.

[@gilbertoabreu9513]

Quero adquirir um máquina desta obrigado

[@GilbertoPeraltaLapidacao]

Tô aqui meu irmão abraços like

[@ufgbaa3192]

hey justin would this work for a batt lap also?

[@JustinKPrim]

Yes just don’t tell anyone I told you 😂 I have scored and rescored many battlaps. Jon Gearloose explained to me that’s it’s not necessary and I don’t argue with the master but I have done it and noticed improved polishing speed on larger stones.

[@ufgbaa3192]

@@JustinKPrim awesome would you suggest doing it the way your sri lankan mentor did with the copper lap video? becuase I did some lighter scratches with a scalpel and then smeared in some 100K diamond and then used a skateboard bearing to smooth everything out. I still has a high spot so i went back and used a topper lap and bent it like you did the saw blade, then took away tin until the surface was more even and then scored, smeared, and rolled it again and got a nice finish. going to test the polishing out today.

[@JustinKPrim]

@@ufgbaa3192 yeah there aren’t any hard rules. You’re basically creating a mathematically chaotic surface and then embedding diamond into. However you get to that point works. If you check out my London lap dressing video you will see they do the same thing with house bricks

[@JustinKPrim]

Also for a batt you don’t need to take topper to it. Just a razor blade or a saw blade is fine

[@ufgbaa3192]

@@JustinKPrim ive only been dressing the bottom side of my batt and it had a high spot and some heavy scratching on it. it also just felt off to use up until i put the topper against it.

[@gemstones_valley446]

I will try to make a best video how to dress

[@gemstones_valley446]

Its easy to dress lap like this 😣

[@gemstones_valley446]

Its wrong way