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Old 06-24-2005, 07:15 PM   #136
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Quote:
Originally Posted by g_bruin
How much on average is taken off the comm during a cut? Lately I have been averaging .003".
I am a tad under that at .002" for stock Monster motors. Could be that you are running mod and have higher wear factor to deal with.
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Old 06-24-2005, 09:07 PM   #137
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I am also running Monster motors. I usually cut after about 6-9 runs.
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Old 06-24-2005, 10:53 PM   #138
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And I do it about every 4 runs in Expert Stock.
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Old 06-26-2005, 11:52 AM   #139
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Originally Posted by MattFrag
Guys the right way for a comm to look when it comes off of a lathe is like the back of a cd. You should see different colors like the back of a cd. Just because you get a mirror finish after you cut doesnt mean your lathe is cutting right. When you finish breaking in your motors, to check for roundness use your pinion wrench and spin up the motor at 5 volts and put the wrench on the back of the brush where the shunt is. It should feel like the motor is off. Meaning little to no vibration. Also brush hoods go out of alignment all the time. The reason aligning both at the same time is bad is because you have compensate for brush cocking. I dont care what anyone says, you do losse 1-3 degrees of timing if you dont align the hoods.
ive never seen a comm as shiny as the back of a CD. even from big motor tuners. may i ask what lathe you are using so i cant have that "back of a cd" shine?
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Old 06-26-2005, 11:20 PM   #140
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Has anyone tried the diamond tips being sold in Ebay for $48-$50? Any comments from users will be good.
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Old 06-26-2005, 11:56 PM   #141
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likewise, has anyone tried the diamond tip bits from mcmaster carr? they claim 300 times the lifespan of carbide tips instead of the usual 100...

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Looking for an alternative to natural diamond and carbide tool bits? These synthetic diamond-tipped bits resist chipping better than natural diamond-tipped bits and last up to 300 times longer than carbide-tipped bits. Use them at high production speeds on nonferrous and nonmetallic materials such as aluminum, copper, magnesium, fiberglass, rubber, sintered ceramics, plastics, carbon, and carbide.
http://www.mcmaster.com/

3316A32 - AR4 - $62.30
3316A42 - AL4 - $62.30
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Old 06-27-2005, 12:50 AM   #142
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Has anyone tried using the lathe below? Can I assume that it cuts from left to right.
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tip's with comm lathes-ea1393.jpg  
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Old 06-27-2005, 01:05 AM   #143
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danjoy,

Yes, they cut left to right. Very good lathe. Smooth and vibe free

Cheers,
Scotty P.
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Old 06-29-2005, 05:22 PM   #144
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Quote:
Originally Posted by dakrat
ive never seen a comm as shiny as the back of a CD. even from big motor tuners. may i ask what lathe you are using so i cant have that "back of a cd" shine?
Why don't you read big jims rc motor black book. In the book he says the most desirable finish is like the back of a cd. The comm reflects colors when shined in front of a flourecent light. Most of the time it looks like a mirror but reflects colors like a cd. By the way I use a trinity comm lathe.
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Old 11-02-2005, 12:24 PM   #145
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I have this lathe
http://www.hudy.net/xhudy/products/p...5&kategoria=61

and last year i believe i baught the wrong bits for it cause they cut like doo doo butter.

Im about to buy a new bit or 2, probably a couple cheap carbide ones of ebay and maybe a diamond bit off ebay.

My question: what do i get? AR4? AL4?
I cant remember what i baught last year.

Thanks
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Old 11-02-2005, 12:56 PM   #146
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AL4, all hudy, trinity, orion, and cobra lathes use the same bit type.

Mark
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Old 11-02-2005, 01:01 PM   #147
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Thanks
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Old 11-02-2005, 01:06 PM   #148
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Quote:
Originally Posted by mtveten
AL4, all hudy, trinity, orion, and cobra lathes use the same bit type.

Mark
i myself use a red express lathe. no bearings on the vblocks, but man it cuts real nice.
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Old 11-02-2005, 01:44 PM   #149
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I need some advice...
For my entire RC life I have been goin with a buddy and borrowing his lathe.Now he is getting out of RC so I am forced to invest in a lathe or pay $3/cut at my LHS.I race mostly stock with some 19t now and then.I cut my stock motors after every 7-10 runs, and I was wondering what lathe would be best for me?Do I need to invest in a diamond bit, or would a carbide work just as well.I don't have a lot of $ so I was thinking of buying used.Are there any major or common problems that occur from using a lathe a lot(besides bit wear).Like, Would A used lathe have any noticable differences in cutting(not just the bit), between a new one.My buddies lathe was a cobra, and I became very familar with it so I was looking for a Cobra lathe.Any suggestions?
Thanks in advance.
Steve
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Old 11-02-2005, 08:52 PM   #150
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Get a fantom lathe and you'll have the cd finish every cut.
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