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Grinder size vs. amount of hollow grinding

Grinder size vs. amount of hollow grinding (post #160061)

musashi on Wed, 12/15/2010 - 16:14

Turning and Carving

I am new to turning, and just setting myself up. I need to get a bench grinder for sharpening my turning tools. I am looking at a 6" model. Is there any reason I should go with an 8"? The larger diameter wheel wouold give slightly less curve as the bevel gets hollow ground. Does this matter one way or another?

Thanks,

Alex

Outside of a dog, a book is a man's best friend. Inside of a dog, it's too dark to read. -Groucho Marx

6" or 8" (post #160061, reply #1 of 11)

by BruceS in reply to musashi [original] on Wed, 12/15/2010 - 16:38

Personally, I prefer the 8"er. The 6" will do for spindle turning because the spindle diameters are generally smaller. But if you get into bowls where the diameters are much larger you will appreciate the larger sweet spot on the gouges. One turners opinion.

Work Safe, Count to 10 when your done for the day !!

Bruce S.

Sweet spot... please (post #160061, reply #2 of 11)

by musashi in reply to BruceS [original] on Thu, 12/16/2010 - 19:25

Sweet spot... please explain.

Thanks

Outside of a dog, a book is a man's best friend. Inside of a dog, it's too dark to read. -Groucho Marx

sweet spot (post #160061, reply #3 of 11)

by BruceS in reply to musashi [original] on Thu, 12/16/2010 - 20:08

The sweet spot is where the tool cuts its best while riding the bevel. You will know it when your there by the nice shavings and ease of the cut.

Work Safe, Count to 10 when your done for the day !!

Bruce S.

I'm still trying to figure (post #160061, reply #4 of 11)

by musashi in reply to BruceS [original] on Fri, 12/17/2010 - 19:03

I'm still trying to figure this out - bigger wheel means less of a hollow grind, which means more bevel left over at the business end?

Outside of a dog, a book is a man's best friend. Inside of a dog, it's too dark to read. -Groucho Marx

I'm confused too. When I (post #160061, reply #5 of 11)

by DonStephan in reply to musashi [original] on Tue, 12/21/2010 - 18:46

I'm confused too. When I hollow grind the hollow extends equally from both ends of the bevel. For me, the only difference between 6" and 8" would be the depth of the hollow midway between the ends of the bevel. If one hones after hollow grinding, both ends of the bevel rest on the stone, creating flat bands. With a deeper hollow, more honing can be performed before the hollow is removed. But in the turning video by Richard Raffin I watched, he didn't hone the bevel - from the grinder back to lathe. How does the size of the grinding stone affect the "sweet spot?"

preference (post #160061, reply #6 of 11)

by BruceS in reply to DonStephan [original] on Tue, 12/21/2010 - 19:56

I just don't care for c vs. ( I can get more support on the bevel with less hollow grind. After grinding gouges they go straight to the wood, no honeing for me.

Work Safe, Count to 10 when your done for the day !!

Bruce S.