Sharpening question

[Mal]

Sorry for the generic picture, but I have one of these coving chisels which worked fine, but lately isn't performing as it should and I'm sure would benefit from a good sharpen.
Problem being, is that I haven't a clue how to go about it, so any advice would be gratefully received! Many thanks.

 

[CHJ]

Lap the Flat Top Surface with a diamond plate or card, do not touch the curved profiles.

 

[woodpig]

I'd say the same except do it with a stone. I still don't much like diamond except in a few cases.

 

[SVB]

I'd say the same except do it with a stone. I still don't much like diamond except in a few cases.

Why is this (just interested). I've seen some pretty shocking, corse and non-flat cheapo 'diamond' stones at the odd tool sale but the better brands 'superfine' / 1000 grit + grades I find work well and are comparable to the equivalent stone.

For grades equivalent to the 2000+ grit then I agree you're back to stones etc but I never bother to go that far with my turning tools.

Simon

 

[CHJ]

IMO it will be a good stone (of appropriate grit) that is aggressive enough to work a HSS tool of that width with hand lapping in any sort of reasonable time.


But the critical thing regardless of abrasive is not to try and touch the form, work on the flat face.


The odd degree of tilt to speed up material removal will have minimum effect on the profile you produce.

 

[SVB]

The odd degree of tilt to speed up material removal will have minimum effect on the profile you produce.

Chas - so the 'David Charleworth' Rule Trick (TM) comes to turning also?

S

 

[woodpig]

I guess I've just had some bad ones Simon. I've always touched up my HSS metal working tools with a small slip stone as the guys at work used to do. The machinists always kept one in their pockets.

I bought a new wood turning lathe a while back and joined a local wood turning club. They bought a job lot of small handled diamond stones that many of them seemed to use but I found it very "scratchy", perhaps if it's worn in it will be better but I still prefer my slip stone.

I've also heard a couple of times that diamond isn't ideal for sharpening steel but I don't want to get into that argument!

 

[SVB]

Ok - thanks WP. - Different strokes for different folks I guess (no pun intended).

Not heard the piece about diamond re steel but agree, those worms are best left in the can round here!

BRgds

Simon.

 

[woodpig]

I've heard very good things about the Spyderco Ceramic stones Simon so I've just treated myself to one of their double sided slip stones.

 

[Dalboy]

I think it is down to personal preference what you use. For my large scraper and skew chisels when I want a quick touch up of the edge I use a diamond credit card from trend little and often

 

[Mal]

Thank you all for the replies, I'll see what Yandles has in stock on my next foray