Would these tools be beneficial to me?

I have found a bench grinder, not sure if it’s going to be a good one.

I think it’s a SIP 07792 around the £30 mark, I don’t know if it’s still available but wanted to see if it’s a good one or not.
looks good, 375w is decent for 6" and SIP are pretty good usually. I have a big belt/disc sander of theirs and car jack and both impressed me
 
Hello

I have also found another bench grinder, what are your thoughts on

Kamasa-Tools 506 CBG bench grinder​

 
Hello

I have also found another bench grinder, what are your thoughts on

Kamasa-Tools 506 CBG bench grinder​

if its an old swedish made model probably good, if its imported model probably crap and better to go with sip
 
I feel like I am being a bit stupid here.

How do I tell what grit and what stones to be used for each and different pieces. Example sharpening gardening tools like axes to fine woodworking blades that require big chip removal, to drill bits.

I have looked at some stones, and they say corse or fine for example (had this problem with sandpaper and wet stones from b&Q family of stores) where it does not state a grit size.


An example would be this stone, https://www.machinemart.co.uk/p/6-150mm-fine-grinding-wheel/
 
same as sandpaper, course removes material quicker, fine gives a finer finish. In practice i rarely use the course one, fine removes plenty of material. But you really shouldn't sharpen cutting edges on a fast wheel, the metal will get hot and become soft. Thats why we were recommending the slow wet wheel ones up thread.
 

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