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 Post subject: Re: Convex edge on an EP
PostPosted: Sat Jan 25, 2014 5:25 am 

Joined: Wed Feb 20, 2013 2:22 am
Posts: 559
I have no doubt you're getting some convexing. I just wonder whether you are getting enough to affect performance. A tangential line to a true convexed edge sweeps through a far greater angle than the EP is capable of, even at its leftmost position.

But if you're seeing results I'm not gonna piss in your Cheerios.

Cheers,

Rick


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 Post subject: Re: Convex edge on an EP
PostPosted: Sun Jan 26, 2014 12:20 am 

Joined: Sat Aug 24, 2013 2:42 am
Posts: 138
Don't know about the performance results yet.
Computer crashed last night and spent today getting it working again so I'll hit the supermarket this Thursday.

Since you know the word tangential, would you have any idea how much a "normal" convex changes?

Thanks

Douglas


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 Post subject: Re: Convex edge on an EP
PostPosted: Sun Jan 26, 2014 12:31 am 

Joined: Sat Aug 24, 2013 2:42 am
Posts: 138
Looking at Lagranians' post, it looks like I'm only changing the angle by about 1.5°.

Oh well, i'll just have to wait and see how it works.

Douglas


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 Post subject: Re: Convex edge on an EP
PostPosted: Sun Jan 26, 2014 1:07 am 

Joined: Tue Aug 27, 2013 2:10 pm
Posts: 181
Nothing ventured, nothing gained. At least you will have the satisfaction of having tried.


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 Post subject: Re: Convex edge on an EP
PostPosted: Sun Jan 26, 2014 8:49 am 

Joined: Wed Feb 20, 2013 2:22 am
Posts: 559
Yeah, we're definitely not sneering at you. Thinking like yours brought us the angle cube, the stop collar trick, and so forth.

It seems like some mechanism is just waiting to be invented. Maybe mount the far end of the rod on a crank or cam so the sharpening angle changes significantly as you stroke.

Cheers,

Rick


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 Post subject: Re: Convex edge on an EP
PostPosted: Sun Jan 26, 2014 8:19 pm 
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Joined: Tue Feb 05, 2013 6:00 pm
Posts: 2013
Rick, I had the same though about something that would change the angle as the stone rod is moved back and forth. Using an curved approach biased towards the main angle versus a linear change in angle throughout the rod stroke.


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 Post subject: Re: Convex edge on an EP
PostPosted: Sun Jan 26, 2014 8:56 pm 
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Joined: Mon May 27, 2013 6:39 pm
Posts: 258
Use a neoprene backed strop or neoprene backed sandpaper.



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 Post subject: Re: Convex edge on an EP
PostPosted: Sun Jan 26, 2014 10:01 pm 

Joined: Sat Aug 24, 2013 2:42 am
Posts: 138
The problem I see with neoprene is repeatablity and getting an exact angle at the edge.
Repeatability could be real close with even pressure but it's getting that edge angle I'm most concerned about.
Dayem I wish I had been able to get to the supermarket.

Douglas


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 Post subject: Re: Convex edge on an EP
PostPosted: Sun Jan 26, 2014 10:43 pm 
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Joined: Mon May 27, 2013 6:39 pm
Posts: 258
I have a neoprene / nanocloth strop coming that ill be using 80ucbn with for establishing convex edges. We shall see



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 Post subject: Re: Convex edge on an EP
PostPosted: Mon Jan 27, 2014 7:55 am 
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Doug, if your goal is to get a continuously variable angle with the EP you can do this by having the blade not be perpendicular to the table. This is not how you achieve a convex edge with the EP. The angle should be measured perpendicular to the edge, not along the axis of the stone arm. The stone arm swings traversing a coplanar surface and is therefore of a constant angle even off axis. It is counterintuitive at first but true. In any case if the angle did vary, it would produce varying angles but not a convex surface. The convex surface is caused by the blade movement on the table inadvertently or purposefully using a medium that can distort with pressure - i.e. a neoprene strop with abrasive surface - eg nanocloth over neoprene. Alternatively you can do a series of angles to produce a polygonally convex surface, approaching a continuously variable convex curve.

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Ken



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