Grinding wheel data required for 7" bench grinder

[Donwill]

I recently purchased a second hand bench grinder with stand. It's obviously an old machine but it runs sweetly with no discernible vibrations. I am going to use the machine in my yet to be converted garage to a workshop and is for my own personal use to sharpen lathe tools etc. In the interests of safety I've removed one of the wheels which appears to be in a good condition and it rings when struck so hopefully no cracks. I need to identify the grit size, recommended speed and whether it's within it's sell by date so to speak. Identifying marks are as follows:

At the top--ABRAFRACT -Maker probably

LHSide-- MOS 3710

RHSide-- 111 51401095

Bottom-- A46NV 180x 20x31.75 -Size presumably, the 31.75 referring to the hole in the middle which has a plastic insert to bring the size down to half inch which is the shaft size.

Does anyone know what the numbers mean, and any advice will be appreciated.

Thanks Don

[John Rumm]

Not myself, but these guys might:

Abrafract Ltd. Trafford Park Road Manchester Lancashire M17 1HP

Tel: [phone]

or there is a web based email contact for them here:

[Donwill]

Many thanks John I have emailed them a modified copy of the message sent to this newsgroup, strangely enough your reply appeared before my message did. Don

[John Rumm]

Damn, I am fast! ;-)

[Dave Osborne]

A46NV - The code mark of the abrasive

A = Regular Aluminium Oxide

46 = Medium Grain Size N = Hard grade V = Vitrified

Have a look here:

5 has the useful info.

Also here:

here:

page pdf) from page 10.

Also here:

x 20 x 31.75 = 180mm diameter, 20mm thick, 31.75mm (1 1/4") arbor hole diameter.