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Unibit

4X4HIGH

4X4HIGH

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Have a question regarding Unibits, is the single or double cutting edge better? I've heard that one of them likes to catch the work and get hung up alot and can't remember which one it was. I've looked at 3 stores today and they all only have the single cutting edge Unibits.
 
I learned an awful long time ago to never say something can't be, but I have been using Unibits for almost as long as they have been out, and I have never see a double edge one.

Since I also cannot remember one catching, I guess the single one is the best one.

Note: It does depend on the meaning of the work catching.........

If the metal is thin, then as soon as a step starts to cut, it cuts all the way through to the next step quickly, but usually stops there long enough for you to stop cutting if that is a big as you want to go.
 
they are very handy to have
I have a couple single cut bits. From Home Depot, "Erwin" I think is the brand. Nice
 
Thanks guys, I did some research and the single cutting edge is what i'm after (makes sense now that I think about it). I'll head back over to Home Depot in the morning and pick up the #4 Irwin Cobalt Unibit. :thumb:
 
I've heard from a customer, who builds stupid big mud trucks with stupid big power that the double edge ones are better.. dunno
 
They do a nice job making egged out or "ovaled" holes round again too!..no other bits do it as well and without jamming up and getting stuck in the work peice..
 
Single or double flute both have pro's and cons as far as I'm concerned. In a way there similar to a counter sink, which of course you can get in single, double tripple quad and five or six flute too.....I started typing and quickly turned this single post into a novel so I deleted it. I have both, and use both, both work just fine. I relate my opinion more along the lines of machining vs "fabrication" so hense the pro and con opinion, but for fab there are pro's and con's too.

Depends on what your doing will depend on which one works "Better". There both going to cut a very similar hole, but someone would have to do a test to determine how the characteristics of both differ, to determine which is the better all around cutter to use. Again, how your using it, and what type of material your using, RPM and feed are HUGE variables which change how a tool performs. These also apply to hand use in a drill motor too.
 
I purchased the #4 Cobalt Unibit at Lowes for $39.00 and i'm sure it'll serve me well. I've used both single and double flute over the years and just remembered that one liked to grab the material easily.
 
I have never seen a double flute unibit, but I love all the ones I have. Now I am curious! Wondering if the double flute works better in steel and the single in aluminum etc.

Does anyone know how to re-sharpen them?
I have 4 that are hammered and need full pilot holes now.
 
Interesting, I wonder how and when they work better. I have never had problem with single fluted ones.

And you gotta love the fact those Snap-On unibits are made in china.

I found frozen salmon at the grocery store the other day, FROM CHINA!
Seriously!
 
garlicbreath said:
Interesting, I wonder how and when they work better. I have never had problem with single fluted ones.

And you gotta love the fact those Snap-On unibits are made in china.

I found frozen salmon at the grocery store the other day, FROM CHINA!
Seriously!
Click to expand...

Those I believe, are made by irwin, ya know, the vice grip company that took its business overseas... The guy I sell them to, uses them on frames a lot and says he likes the way they cut..:dunno:
 
That makes sense they would work better on thicker metal. That seems to be when mine have trouble.
 
I have a double cutting edge unibit , don't think i have used a single. We use them in the electrical trade for drilling panel cans that do not have existing knock outs.
 
oakknight said:
I have a double cutting edge unibit , don't think i have used a single. We use them in the electrical trade for drilling panel cans that do not have exsisting knock outs.
Click to expand...


Yeah that's what got me into Unibits. We used them to make the holes for the hydraulic knock out punches. :D
I was lucky enough to get a truck with a set, I hated hand wrenching the knockouts through!
 
garlicbreath said:
Interesting, I wonder how and when they work better. I have never had problem with single fluted ones.

And you gotta love the fact those Snap-On unibits are made in china.

I found frozen salmon at the grocery store the other day, FROM CHINA!
Seriously!
Click to expand...
at least Snap On is straight up about where they cone from
 
SOOO, does anyone know how to resharpen them or a place to send em?

I suck at sharpening bits in general and they always end up walking every where once I am done.
 
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