I think  I am idiosyncratic on this,  but for what it is worth:

My wooden scrub planes have arced  blade ends, but they also are rounded 
on the edges of the sole and to a lesser degree across the sole.  Think 
of the bottom of the plane being like the cross section of a banister rail.

This is functional.  By tilting the plane you can change the amount of 
bite the blade takes.  It works naturally and well. Beats fiddling with 
the plane in the middle of a scrub job.

I did not make them that way.  They came that way.  Crazy 
German-Norwegian-Swedish-Finnish in our area.

A couple have a rounded "hoof" on top of the plane to put your hand on.  
Without that, gloves are necessary for scrubbing.

Regards,
John Lederer
Oregon, Wisconsin

Michael Campbell wrote:

>I picked up a cheap woodie coffin-type plane a bit ago and am
>considering making it into a scrub.
>
>How does one grind the camber into the iron?  It's, naturally, ground
>straight right now.  I'm not above using electrons for this, but is it
>sufficient for a scrub to mark the curve I want, then freehand it on
>the grinder, then sharpen?  Seems it would be, but wanted to get some
>more learned opinions.
>
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