Crystal Size Conversion

[Davey]

Does anyone have a handy chart for crystal size conversions (i.e. 140, 150, 160 -> mm), I have measured the crystal but do not have a model number to order from so need to convert 38.20mm to a standard size.

Cheers

[offshore]

Here is a chart I find handy.

Offshore

Sorry its on its side- prints better this way!

I have some GS charts as well if they will help

[Davey]

Thanks for that offshore,

What the method of conversion on this chart?

[offshore]

Davey,

A lot of the old crystals are marked in " Lignes" ( French sizing I beleive) so the crystal has a sticker saying for instance... 12 7/16... this would be a 281 mm dia crystal, according to this chart.

Another link is the PDF from GS, although this pertains to GS crystals specifically.

http://www.gssupplies.com/GS_crystal_chart.pdf

If you want to delve more in to GS crystals, spend some time on their site.

http://www.gssupplies.com/watch-gauge.html

I am still getting my head around the whole crystal thing... ( and have some ways to go yet)

More great info can be found here-

http://nawcc-mb.infopop.cc/groupee/forums/a/frm/f/6286058233

But please don't get on the NAWCC forum ( or any others ) and mention reps

Good hunting,

Let us all know what you finally find.

Offshore

[Davey]

281mm is 28.1 centimeters thats a big crystal!

I assume these values need dividing by 10?

I've not got the crystal so cant reference it, I can only measure the hole

[offshore]

281mm is 28.1 centimeters thats a big crystal!

I assume these values need dividing by 10?

I've not got the crystal so cant reference it, I can only measure the hole

Indeed... excuse us convicts from downunder, who have only recently converted to metrics ( about 20 years ago) Having been schooled in imperial, the old brain never thinks of the "real" size.

Yes... that would indeed be 28.1mm'

Offshore

BTW, there is a formula for the size of crystal required, against the measured hole... I normally just go up one size ( most fit, but I break the odd one) Spend some time reading on the NAWCC site... valuable info.

[Davey]

Ignore me I'm a bloody idiot! lol!