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So what am I doing wrong?
woodndesign:
John, I hope from the advice you've been given, you've got a better finish. One question with regards to your sharpening, is what grind are you using is it standard square grind, (push cuts only) or do you also have one with a long side or fingernail grind, with which you can make finer shear pull cuts with the lower wing, flute just open from the face of the wood, lowering the handle in the cut increases the shear, this can help to over come pull out. What ever the out come, practise on this one piece will save many more of the same in the future, will watch for the results of a nicely finished bowl.
David
Katchin:
Andy, about what you wrote about sharpening. You are correct, after looking at some of the tools that were being used at a demo last night, mine were practically blunt in comparison, with the exception of the scraper and skews.
I bought a new 3/8 bowl gouge last week from Axminster, with the intention of sweeping it back as an alternative to the standard gouge, so far I have half killed it and have managed to gain a terrible edge, I overheated it for one thing. In its current state it is more or less unusable, I think I will have to try to either grind it back to its original angles, or learn how to put the correct angle on it.
I am using the Sorby 447 universal Jig with fingernail profiler, with bad results so far. I am also using the wheel that the grinder came with, maybe this is where my problem lies. The grinder had a thin and a thick wheel, I am using the thicker wheel, grey / white in colour.
Any thoughts anybody?
woodndesign:
John, As you have the 447, have a look at there sharpening video; http://robertsorby.co.uk/sorbymedia/sharpening1.wmv http://robertsorby.co.uk/sorbymedia/sharpening2.wmv The other thing is, was the 3/8 gouge a fingernail profile when brought, as if not the flute maybe wrong for this type of grind.. your grinder sounds to have the right wheels and the white is the one to use, an use the whole face, have you dressed the wheel, taken off the sometimes smooth non cutting surface.. next thing is ask at your Club or show what is going wrong, you need not be embarrassed to ask, we find many want the same answer, when the question is asked.. Hope this is of help.
Thank you to Robert Sorby for their Video.
David
thebowlerhattedturner:
Hi Katchin,
I use the 447 system all the time. I also use the grey wheels that came with the grinder. What you need is a gentle touch on the stone, don't press hard or you will draw the temper of the steel. In the past when I ground a chisel to the wrong angle I would stand for ages trying to rectify the problem and get a good grind. That is the worst thing you can do for the steel as it is bound to heat up. Make sure that the wheel is not shiny as this indicates that it is clogged and will not cut efficiently.As David said make sure the profile you are after is suitable for the chisel you have and re-read the 447 instructions and make sure all the settings are correct. In our club we have sharpening evenings where the most experienced members show newcomers to turning how to get an edge on their tools. You haven't done anything that a 1000 others haven't done before you. At least you have recognised the problem instead of trying to plough your way through with blunt tools.
Regards
John
Katchin:
Thanks. The videos are very informative, i'll check all the measurements in the morning. I will also ask at the club, only problem there is its two weeks before the monthly workshop meeting.
The chisel I was trying to grind was not a fingernail profile, I thought they could be ground that way though? If not, that would explain a few things :D
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