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Old 04-21-2006, 10:16 AM   #46
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if the bit were oriented correctly according to the rotation direction of the comm, would either spin direction produce the same cutting results?
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Old 04-21-2006, 11:06 AM   #47
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Quote:
Originally Posted by wagonman72
D_AMES

The tip alignment tip is awesome. I have an old Twister lathe that I am going to use that trick on. Once again VERY cool!

No problem. Just don't try it with a diamond bit.

Everyone, Jack Smash is correct (thanks Jack). I forgot the comm lathes are inverted. The tip should be centered or HIGHER to the diameter of the comm. Just not too high.

Sorry for the confusion.
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Old 04-21-2006, 11:10 AM   #48
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Originally Posted by D_Ames
No problem. Just don't try it with a diamond bit.

Everyone, Jack Smash is correct (thanks Jack). I forgot the comm lathes are inverted. The tip should be centered or HIGHER to the diameter of the comm. Just not too high.

Sorry for the confusion.

No problem Oh wait.. im not Jack Smash
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Old 04-21-2006, 11:18 AM   #49
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Quote:
Originally Posted by mafiaracers
But....you are using a "diamond" bit....I'm talking about getting maximum life out of a "carbide" bit.

13 years is still pretty sweet though...
And I was replying to a post that asked about the max life out of a "diamond" bit...

-James
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Old 04-21-2006, 11:46 AM   #50
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Quote:
Originally Posted by mafiaracers
well....then moving to the topic of lathe speed.....if I'm using cells to run the slave motor, how many would be best? 2-3-4? at the moment I'm using 4. Should I take it down a cell?
it also depends on the slave motor. some people us a 55t, and some use an old stock or a silvercan, which would require diffrent voltages for the same speed
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Old 04-21-2006, 12:10 PM   #51
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Default ^^^^^^^^^^^^^

I'm using a 55t....not silver can.
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Old 04-21-2006, 12:31 PM   #52
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Quote:
Originally Posted by wagonman72
I think last time I looked at an industrial supply site I found brand new sharp carbide bits for something like $5 each. Hard to beat!
Ken's Tools, Riverside, CA -- $3.25 left, right, or center cut. They also sell blanks so you can shape your own...
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Old 04-21-2006, 12:45 PM   #53
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Quote:
Originally Posted by mafiaracers
asuming you've got a 55 turn slave....how many volts or cells would be best?
I have a 55 turn on my lathe and run it direct from the 12v power supply.
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Old 04-21-2006, 01:04 PM   #54
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Somebody mentioned about chipped bits. I am not familiar with the bit of a comm lathe but on a normal lathe the bit is shaped for different materials or how much material you intend on taking off in one pass. It is also shaped to direct the swarf.

When i chip a bit on a normal lathe and make a pass it will tend to leave drag marks on the workpeice. Its as if the tip is heating up too much. But its certainly no where near as clean a cut as a new unchipped bit. Whether this is the same on comm lathe bits i dont know..
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Old 04-21-2006, 01:08 PM   #55
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Quote:
Originally Posted by mafiaracers
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.....
so can u cut carbon fiber chassis there at your college?
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Old 04-21-2006, 01:18 PM   #56
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if I knew how to make the program on the 2d machine...I don't see why not...
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Old 04-21-2006, 04:16 PM   #57
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Some useful information
Attached Files
File Type: pdf E_PRX_06.pdf (409.8 KB, 191 views)
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Old 04-21-2006, 04:39 PM   #58
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interresting...
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Old 04-21-2006, 05:20 PM   #59
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Quote:
Originally Posted by mafiaracers
if I knew how to make the program on the 2d machine...I don't see why not...
I have AutoCad or Solidworks if you need something drawn up.
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Old 04-21-2006, 05:52 PM   #60
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sweet man! I'll let keep that in mind!
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