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Old 01-31-2010, 05:34 PM   #1
eyezlee
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Default Sharpening a UniBit / Step Bit

I've got a set of Uni bits from Irwin and 2 of the 3 won't get started. Once I get a hole drilled with a regular bit, the step bit takes off and works correctly.

What's the proper way to sharpen these kind of bits?

Thanks.
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Old 01-31-2010, 06:21 PM   #2
mcdtommy23
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Default Re: Sharpening a UniBit / Step Bit

I sure hope someone can answer this, I've got about 6 or 7 uni-bits that we burnt up in stainless. I saved them hoping to be able to resharpen, or I figured they could be used for something, I just didn't/don't know what.
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Old 01-31-2010, 06:51 PM   #3
Mickey O
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Default Re: Sharpening a UniBit / Step Bit

I just sharpen the tips and file any burrs off in the opening along the side.
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Old 01-31-2010, 07:03 PM   #4
eyezlee
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Default Re: Sharpening a UniBit / Step Bit

Sharpen the tips? Can you expand please.
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Old 01-31-2010, 07:08 PM   #5
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Default Re: Sharpening a UniBit / Step Bit

A tool sharpener is really the right way to do this and maintain the proper angles. That said, I take them to the bench gringer with a 6" wheel. I hold them by the shank and grind them on the side of the wheel. This isn't really the correct way because the side of the wheel is 90 degree's to the face which yeilds a zero degree rake angle. Most unibits I've seen are a positive rake. Not right, but it puts a fresh edge on the tool and does it quick. These things are too $$ to throw out. I'll go to work and snap some pics.

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Old 01-31-2010, 08:01 PM   #6
Diablo
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Default Re: Sharpening a UniBit / Step Bit

I use my uni-bits daily and have found that using a file can make it a bit better but there is no real good way. I have just settled with making a 3/16 pilot hole for pretty much everything.
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Old 01-31-2010, 08:44 PM   #7
E.rodz
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Default Re: Sharpening a UniBit / Step Bit

you can send them out to fastenal to get sharpened. you realy should pilot the hole before using a unibit to prevent walking anyways. you can use a 4" grinder to sharpen theese also or a grinding stone for tool room bit sharpening. hope this helps.
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Old 01-31-2010, 09:04 PM   #8
cheap bastard
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Default Re: Sharpening a UniBit / Step Bit

I have used a rotory chain saw sharpener and a steady hand. It only works to the length of the stone.
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