Thread: Why lapping film rules

Here is a general little formula that I picked up somewhere on the forum a while back. It is a pretty good approximation.

Estimated Microns = 14755/Grit

for a 30k stone for instance

Estimated Microns = 14755/30,000
= 0.491 microns

Take Care,
Richard

Originally Posted by riooso

Here is a general little formula that I picked up somewhere on the forum a while back. It is a pretty good approximation.

Estimated Microns = 14755/Grit

for a 30k stone for instance

Estimated Microns = 14755/30,000
= 0.491 microns

Take Care,
Richard

Hi,
Well with this calculation it seems 2 micron would be good for honing. Is there a 2 micron diamond lapping film? Thanks.

Originally Posted by ferroburak

Hi,
Well with this calculation it seems 2 micron would be good for honing. Is there a 2 micron diamond lapping film? Thanks.

Yes. 3M makes 2 micron Al2O3 films:
http://multimedia.3m.com/mws/mediawe...6EVs6E666666--

I just found that 1 and 3 µm films are easier available.

... does anyone know where i can find a video of how to use lapping film??

........i've read the thread, but if i don't see it being done, i don't want to try it....

.......thanks in advance......

You really do not need a video explanation. All the actions are exactly the same as with a "normal" stone.

All you need is a flat surface like a glass tile, or granite or similar.
If you have the PSA version: stick hte film to the subtsrate via the pressure sensitive adhesive.
If you have the non PSA version: wet the film and the substrate and the film will stick automatically.

Either way, wet the film afterwards and consider it a normal stone that does not need lapping, but will wear in time.
Carefully sharpen your razor in any direction you want

the desired lapping film grits are:

5µm for resharpening, quick and agressive like a 2k stone
3µm for prepolishing, quick but smoother. Like a 5k stone
1µm for absolute polish, quick, extremely smooth, extreme high polish

(keep in mind: these "grit to JIS" comparisons are made via my own experience. Do not get confused too much with the numbers and grit ratings)

...Lesslemming, thank you for the great information....

..........and even moreso for taking the time to write it all down.........

.........much appreciated.........

You do need to be careful with the higher grit films. When you hone edge into them and not trailing, they are very easy to cut.

Have fun.

I've done a few razors lately with some lapping film I got for free. I've used them just as any other hone, all edge leading.
Some suggested a trick using a sheet of wet paper under the final grit for the finishing, which have worked out quite good.

Very very nice edges off the film, good stuff for anyone on a budget, quite portable as well.

I use a damp piece of paper under films and it acts as a great cushion.
Film is probably the most effective hone I have used to date, it just isn't fun like stones are...
But they're extremely fast and efficient, a monkey can use them.

i have read a bunch about lapping film but where can i get it?? and are there some grits you just shouldn't use?