Team Cobra Comm Lathe ?????

[EeePee]

Originally Posted by Boopernator

Do you know if it's a certain RPM to run the lathe at to get the best results? Or am I over thinking it. The 55 turn motor will have less RPM than a 27. The instructions say you want a smooth motor with less vibration. An I'm guessing you just plug a battery into the motor, no ESC right.


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Pretty sure there's a sweet spot and I connect the battery directly.

[Boopernator]

Okay. To start out I'm going to use an ESC and servo tester. That way I can run the lathe at a controllable speed. Then with some experience I can just dive in with a battery.


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[EeePee]

Seems smart.

[cartronicshn]

Hey EeePee, do me a favor, could you post a direct link for the carbide link at Mcamaster? the link from above shows all the bits and i am not sure which to one buy, sorry for the newbieness

[EeePee]

I would if I could, but I don't know exactly which it is. I bet it's been covered in the cutting a comm thread by JRH or EddieO. And most certainly on Google. I have two of the Cobras and both had decent enough bits that I never bought a new one. Honestly, as gentle as one should be with these things, and against copper, I'm surprised anyone needs a new bit.

[Boopernator]

Good point. I was wondering about the diamond bit, but I think the carbide bit will suffice.


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[Hal]

I have an old lathe (25 yrs) it still has the original bit, and it's carbide. You can sharpen a carbide bit on a grinder with a depillatory wheel. The wheel breaks down quickly to remain sharp enough to cut the carbide. Another way to sharpen it inexpensively is to use a diamond knife sharpener and a little light oil. It is a flat plastic pad with little discs of metal mixed with diamond. They usually hava a rougher and finer side. They work good if you are only touching up the cutter. If it is chipped it needs regrinding. A com is soft material so you need a sharp cutter. Also it is a "interupted cut" meaning it is multiple surfaces and is tougher on the cutter so no vibrations is best. I run a 4 cell nimh and 55 turn motor and it works great plugged in strait to bat. I looked at MSC and McMaster Carr site, they both have the cutter I believe you are referancing. I have bought many cutters for our shop from them .Goog luck. Later.