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Repeat settings on Wolverine system (Read 345 times)
 
David Moeller
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CONOVER 15 x Infinity
NOVA Comet 10 x 16
Delta 1440 (converted to VSR)
Repeat settings on Wolverine system
Feb 15th, 2017 at 9:08pm
 
After many yrs using the Wolverine system I updated to a CBN wheel. The problem is repeating settings of the long arm for each chisel. Using set-up sticks is a oft recommended system but I soon tired sorting thru a pile of sticks and matching stick to chisel. This jig uses the chisel as its gauge. Attach a bar parallel to the long arm with a locator block on the end. To use align the chisel to the wheel and lock the arm. Now lower the chisel alongside the bar keeping the butt in the v socket and make a witness mark on the chisel handle where it meets your locator block. Next time you sharpen line up the block with the mark and grind. The setup shown is proof of concept. Will now add a semiphore style marker to the bar with a more precise edge.
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Bill Rockwood
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Re: Repeat settings on Wolverine system
Reply #1 - Feb 16th, 2017 at 12:28am
 
David,
If I am looking at this correctly, you are registering the setting of the holding bar based on a constant - your witness mark - which puts the holding bar in the same place each time, which is a neat idea and what you want for gouges using the vari-grind jig, this gives repeatability for bowl grinds, for example.  But in your first picture, it looks like you are setting up to grind a roughing gouge, and this won't really work in the long run for tools sharpened in this manner.  You will lose a little steel with each sharpening, and if you set the bar to the witness mark each time, you will be slightly changing the grind angle each time as the steel shortens.

But to carry your idea over to a roughing gouge, if you (1) sharpen your gouge at your desired angle, then (2) laid your gouge down as you show and fix a stop block on your parallel bar to register against the tip of the steel, you could then set the holding bar each time by (1) setting the tool tip up against the stop block and (2) setting the holding bar up against the butt of the tool handle.
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David Moeller
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Old chiseler

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Linden, Michigan, USA
Linden
Michigan
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Gender: male

CONOVER 15 x Infinity
NOVA Comet 10 x 16
Delta 1440 (converted to VSR)
Re: Repeat settings on Wolverine system
Reply #2 - Feb 16th, 2017 at 1:58am
 
Thanks Bill. Interesting solution. Thumbs Up
The tool is a 1/2 skew but not lit well.
My solution to tool angle change due to grinding is to adjust the grind and simply move the witness mark on the handle.
I didn't mention that the wheel is cutting in reverse "up" so it will not jam short bevels such as roughing gouges. Also certain tools such as flat scrapers still need to be done on a flat tool rest.
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Ed Weber
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Re: Repeat settings on Wolverine system
Reply #3 - Feb 16th, 2017 at 9:40am
 
Bill Rockwood wrote on Feb 16th, 2017 at 12:28am:
But in your first picture, it looks like you are setting up to grind a roughing gouge, and this won't really work in the long run for tools sharpened in this manner.  You will lose a little steel with each sharpening, and if you set the bar to the witness mark each time, you will be slightly changing the grind angle each time as the steel shortens.


This is where the V-arm can be a bit of a pain.
Having to constantly adjust a jig of any kind is usually not efficient and/or accurate.
With the V-arm, your reference is the length of the tool which is variable, that's a problem. Not to mention those who use friable wheels, which adds yet another changing variable.
It's hard, if not impossible, to get consistent results when you reference is constantly changing, 

If you switch to platform sharpening, using the desired angle for your tool not the length, (a constant)  it will give you more consistent results, the exact same angle every time. You'll also grind less tool steel since your not chasing the angle each time it's off a bit due to setup errors.
Once you set the angle, you need to only touch the tool to the wheel to sharpen, nothing is wasted.
There are many ways to make special platform accessories for specific tools, like grooves that align skews at the proper angle or a channel to keep roughing tools straight.

Just a suggestion
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