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Model Forum / Radio Controlled / Land Models / December 2003comm cutting
I bought the Trinity lathe and can now cut my own comms. Besides cleaning the motor with motor spray, cutting the comm, replacing the brushes, maybe the springs, then lubricating the bearings or bushings, do you guys do anything else? Are some people using some kinda drops on the comm after it's cut? should I be using comm cutting oil while I cut it? The directions that came with the new lathe do not mention using comm cutting oil. At this point I'm using the carbide bit. TIA. I'm thinking that you're ready for an electric motor dyno. That way you can tell for yourself how well each step in the process helps you. http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXWW93&P=7  SignatureJustin Mahn remove Panties to e-mail > I bought the Trinity lathe and can now cut my own comms. > [quoted text clipped - 10 lines] > > TIA. > I'm thinking that you're ready for an electric motor dyno. That way you can > tell for yourself how well each step in the process helps you. > > http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXWW93&P=7 the wife just pooped a brick when she saw the receipt for the lathe, the dyno will have to wait, and I need to stop leaving the sales receipts around the house. :-D SignatureJustin Mahn remove Panties to e-mail > > I'm thinking that you're ready for an electric motor dyno. That way you can > > tell for yourself how well each step in the process helps you. [quoted text clipped - 4 lines] > the dyno will have to wait, and I need to stop leaving the sales > receipts around the house. >should I be using comm cutting oil while I cut it? The directions that >came with the new lathe do not mention using comm cutting oil. > >At this point I'm using the carbide bit. > >TIA. Absolutely. you should always use oil... Some say that they use a sharpie, and that it provides adequate lubrication. That is just not true. I use a sharpie, to blacken the comm, and then put oil over that. You get the proper lubrication, AND you can see if you have got the comm round. You can get great cuts with carbide. When you hear people say that you can only get a good cut with a diamond, they are the ones usually doing it wrong...... Dan ---------------------------------------------- Why is lemon juice made with artificial flavoring, and dish washing liquid made with real lemons? > When you hear people say that you can only get a good cut with a diamond, > they are the ones usually doing it wrong...... a machinist I know took a look at the diamond tool for RC motors. His opinion is that the word diamond is a marketing phrase and that the actual tip of the tool is not really the precious stone we know as a diamond nor is it what the tool industry would call a diamond tip. He also said a carbide tip dopes a better job. I am going to have to agree with Kenji. My lathe came with a "diamond" bit. The bit cut like crap. I grabbed a few bits from work, (carbide) and the cut was much better. The guy that sharpens our tooling at my shop looked at the diamond bit and said it might have a diamond dust coating but that wears off on contact and the carbide below does all the cutting. He was able to easily rub off the diamond coating with a sharpening stone and then re-sharpen the carbide. That gives me another spare. FWIW Johnboy > > When you hear people say that you can only get a good cut with a diamond, > > they are the ones usually doing it wrong...... [quoted text clipped - 6 lines] > > He also said a carbide tip dopes a better job. >> When you hear people say that you can only get a good cut with a diamond, >> they are the ones usually doing it wrong...... [quoted text clipped - 6 lines] > >He also said a carbide tip dopes a better job. I think you should also know that there are different grades of carbide... The carbide bit that came with my Cobra lathe did a horrible job. They say, 'oh, you should get the diamond bit, you won't believe the difference'. And that is true. The diamond bit does a much better job than the piece of crap that they include with their lathe. However, a "good" carbide bit, made all the difference in the world, at a LOT less money... The bit that came with the lathe got tossed, it was nothing more than a piece of sh.t. Before I got the comm lathe, I was actually truing them on a full sized lathe with a high speed steel bit, and the results were great. It's just not that practical to use a huge machine to cut an r/c armature. It did a much better job than the crap carbide in the designated lathe. Your machinist friend should be able to steer you to a good carbide bit, for short money... Dan ---------------------------------------------- Why is lemon juice made with artificial flavoring, and dish washing liquid made with real lemons? |
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