Sintered Diamond Laps

As well as special systems I also make sintered diamond six inch laps. Lets start with diamond quality. Diamond grit comes in many grades and some are designed more for plating than sintering. There three main groups for metal bond diamond sintered laps.Metal bond being in bronze or copper, so lets start with 433 diamond. Its well friable diamond particles resembling irregular shaped lumps designed to self sharpen by breaking down. These are most often used in sintered grinding wheels and discs. The next grade would be 768,which is a combination of the higher grade 989 and 433. Its most often used for tools made for the glass industry to give a good clean grind and long wear factors between redressing. 989 and 999 diamond are blocky crystals designed to take a higher pressure grind on tougher materials and are more resistant to heat build-up during grinding. Of course there is a huge price difference between 433 and 999 up to six times in fact and considering you need about 50cts of diamond in a standard 6 inch laps having a 3.5mm thickness the cost is considerable.These grades apply to discs from 25- 400 grit,anything 600 and above are generally available in synthetic which is blocky crystals. So if you find yourself redressing your roughing laps and wheels often then maybe there only 433 grade diamond. What I have found is that everybody only wants to talk quantity, thickness and price but not diamond quality. Sort of a salesman saying we buy the best available knowing only a cheap grade was available. I’ve only made a few grinding wheels and ended up turning the mold frames into disc molds because my wheels were three times the price of what was available in China. However, my wheels are still straight and sharp and the Chinese wheels are bowed out in the middle and not dressable back to flat. So I make 768 and 989 diamond grade roughing discs. NO 433
I also make sintered copper laps without the diamond but I still add in the powder lubricant.These laps are soft copper having been to 800 degrees centigrade and porous being not over pressed during sintering. This makes them a very good copper lap, far superior to discs made from plate or bar which is usually half hard. The finish is very apparent when you have used both discs.
I also do a combo lap in copper for pre-polish and special alloy (I need to find a name for this lap) centre lap for  final polishing with compounds in both 6 and 8 inch versions.

You can contact me by Email: rough2cut@gmail.com