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Old 04-19-2006, 06:42 PM   #1
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Default Some food for thought...

Alright, check this out...I am living at a college and we have a pretty big physics department. In the physics building, we've got a rather extenisve machine shop complete with pretty much any tool you could possibly imagine for making anything your heart could desire.

ANYWAY, I took my carbide comm cutting bits there today to talk to one of the physics professors about sharpening them. So, he got all excited when I showed him the bits and then the comm lathe itself and then I cut the comm once so he could understand what exactly it was supposed to do.

Long story short, we took the bits and put them under a major league microscope and looked at the tips and he said that they were just fine. This is after about 20 cuts. I told him that these bits should only last around 5-20 cuts then they become dull and need to be either replaced or resharpened.

He looked at me like I was freakin crazy! "20 cuts!?" "on a carbide bit!?" He said that with carbide, and proper use, cutting technique, and assuming you're only cutting comms.....QUOTE!!! "there's no reason you shouldn't get atleast 1000 cuts before re-sharpening." UNQUOTE!!! I told him he was crazy, but he was absolutely serious in his remark.

He talked about using a special cutting fluid on the comm/bit during cutting to keep the action well lubricated and cool and that with that, there's no reason you shouldn't get atleast ONE THOUSAND cuts before re-sharpening. so now, he wants to buy up a bunch of motors and one brand new carbide bit and use my lathe to cut motors until with the truth of a microscope reveals that the bit is no longer capeable of producing a proper cut.

1000 cuts with a carbide bit....what do you think about that.....
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Old 04-19-2006, 06:49 PM   #2
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I can totaly see that with my myself doing some machining on the side and all i use is carbide bits and i cut steel with them and they will last about 20-30 cuts or so.


think about it a comm is actually quite soft it is easilly scared or chiped
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Old 04-19-2006, 07:09 PM   #3
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Mine had hundreds of cuts on it until I replaced it with a used diamond bit tip. it was fine when I replaced it. Got the diamond bit for cheap so I couldn't resist temptation.
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Old 04-19-2006, 07:18 PM   #4
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Back when I bought my first lathe, I only got about 10 cuts out of my carbide bit before the comms started looking rough...
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Old 04-19-2006, 08:03 PM   #5
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Same thing I was tought in machining class. With proper care and use a carbite bit should last for long time. I've never replaced a carbon bit, but I usually buy new lathe every couple of years with new bit .
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Old 04-19-2006, 08:09 PM   #6
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so....realizing that a thousand is a rather large number....could we realistically say that....with proper lubrication and technique, you could get maybe 100 cuts out of a carbide bit?
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Old 04-19-2006, 08:17 PM   #7
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Call up mythbusters!!
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Old 04-19-2006, 08:18 PM   #8
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Quote:
Originally Posted by mafiaracers
so....realizing that a thousand is a rather large number....could we realistically say that....with proper lubrication and technique, you could get maybe 100 cuts out of a carbide bit?
Fantom sells Comm Cutting fluid. I have not seen it from anyone else.

Jeff
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Old 04-19-2006, 08:29 PM   #9
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Quote:
Originally Posted by Jeff Brown
Fantom sells Comm Cutting fluid. I have not seen it from anyone else.

Jeff
our chemestry department also developed a lubraction fluid for the machine shop and physics department. It's pretty sweet stuff!
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Old 04-19-2006, 08:30 PM   #10
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Quote:
Originally Posted by andrewdoherty
Call up mythbusters!!
already did
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Old 04-19-2006, 09:36 PM   #11
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Default 100 cuts

I'd say that 100 seems a little to high, but if you are taking care of your bushes so that they don't make big groves in the comm, it could probably be posible.
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Old 04-19-2006, 09:39 PM   #12
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Quote:
Originally Posted by mafiaracers
so....realizing that a thousand is a rather large number....could we realistically say that....with proper lubrication and technique, you could get maybe 100 cuts out of a carbide bit?

I hope you will post the results of the test, whenever that might be.

My money is on the professor, I think a thousand cuts with carbide on a copper comm is right. As long as your equipment is in good order. Let the cutting begin
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Old 04-19-2006, 09:47 PM   #13
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i agree. copper is a soft metal when compared to steel or carbide. if use and maintainance is proper, 1000 cuts can be attained... but i think 300 is respectable
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Old 04-19-2006, 10:32 PM   #14
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so....if 100+ is reasonable....maybe even 300, why are people so desperate to get diamond bits? If this turns out to be true, I'll take my 5 dollar bit to the race track!
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Old 04-20-2006, 08:42 AM   #15
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interesting thread... what does mythbusters say? oh and that Carrie host is cutie
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