how can I modify a sapphire crystal to fit into casing?

[nicnjon 0]

I have recently bought a piece of sapphire crystal Jackson Tse to replace the existing crystal on the PAM 111 PVD.

After removing the original crystal, I found out that the sapphire (from Jackson) could not sit nito the PAM casing.

It was very slightly bigger in diameter.

 

I hope to get some advise on how can I modify the sapphire to sit into the casing.

I also noticed that the sapphire crystal is slightly thicker than the mineral glass, will that be a problem

for the sapphire to sit in completely.

 

Really appreciate all the suggestions. Thanks!

[Balad1 0]

I might be wrong but I think you're screwed and need to look for another crystal.

[greg_r 82]

um - trying to resist the temptation to tell you to modify it with a hammer....

 

No, the crystal and case need to match. You cannot modify the crystal - you may be able to modify the case slightly, but if it's PVD your problem then is going to be damaging the finish.

[Eiderdaus 0]

This won't work mate, i guess regular tools are Not made for shaping glass.

[KeNnY 29]

diamond filler and there you go

[KBH 7]

I've always thought a good watchmaker could cut and shape crystals on a lathe. Finding a "good watchmaker" is the hard part, though.

[Balad1 0]

Note that if a crystal is made from real sapphire (man made) it is a 9 on the Mohs scale. Meaning it's not easy or cheap to cut/shape.

 

[fine dd 0]

I adjust every day crystals that won´t fit.

Do you have the correct dimensions from the old and the new crystal?

If your new crystal is 0.1-0.6 bigger you can remove the crystal gasket, lay the new crystal in and use crystal cement or UV glue to fix it.

[Luthier 1]

Go to any prescription glasses lab, pay $10, and they'll do the job. They have diamond coated grinders.

[Ska 11]

Uwe - you're a legend. I wish I was you!!

[nicnjon 0]

Sorry for the late response. Just got back from work from abusy day.

Thanks for al the replies and suggestions.

 

The sapphire crystal i bought from Jackson was only very slightly bigger in diameter.

I would think its only less than 1mm bigger than the original glass.

Anyway I told Jackson the sapphire is meant for a 44mm PAM 111 watch which came from Prestige watch.

And Jackson told me that his sapphire would definately fit his PVD 44mm casing.

 

I thought of grnding the sides down slightly so hoping that it wud sit into my PAM 111 case.

What equipments shud i use?

[nicnjon 0]

Thanks Uwe, i might just try that- remove the gasket and try fit the glass and use crytal cement to fix it