|Jul 25, 2014, 08:52 PM|
USA, ME, Ellsworth
Joined May 2008
Has to be an abrasive process for shafts in the typical motor. You can see the process in these threads:
Making and Replacing a Brushless Motor Shaft - http://www.rcgroups.com/forums/showthread.php?t=1240725
HexTronik DAT-750/DT750 Replacing a Shaft - http://www.rcgroups.com/forums/showp...postcount=1080
Prop Savers - Fitting, Using, Testing, & Making Thera-Band Bands - http://www.rcgroups.com/forums/showthread.php?t=1419378
I could not live without my Dremel tool. The abrasive cutting discs come in a variety of types and thicknesses. The one I use for adding flats, cutting shafts, and cutting snap ring grooves is the Dremel #409 abrasive disc and it is held in a #102 arbor. That will cut a groove that is about 0.025" wide and, of course, with continued cutting will cut all the way through a shaft.
Use them with light pressure and wear eye protection. They can and will shatter in use occasionally. The fragments are not heavy or particularly dangerous but you definitely do not want to get them in your eyes. A light caress with the disc at full RPM and at a right angle to the shaft will produce a stream of sparks and a nice little flat. And that stream of sparks is the perfect load on them for cutting.
I recently got some diamond coated rotary cutting discs at Harbor Freight and they are simply wonderful:
There are five discs in the set and I am still on the first one of them after a number of cuts.
As you use the Dremel and abrasive cutters, keep in mind that the stream of abrasive debris coming off of the cut is not without health dangers (eyes, lungs, etc.) and can be damaging it if gets into the wrong place. Direct it away from yourself and put delicate things like motors in a plastic bag if you cut a shaft with a running motor (the perfect way to do it for the perfect cut).
I have a tuna fish can with about 1/4" of water in it on the bench. I most often hold the item (shaft, screw, whatever) over the can and let the water catch the spark stream.
I think I have worn out two Dremel tools so far but it has taken over 50 years to do it...
|Jul 25, 2014, 11:17 PM|
I appreciate what you guys see and your comments are definitely appreciated.
In fact, on of the winds was taking a shortcut over the top of the tooth.
Fortunately I could feel it when I assembled the motor and packed it back down over the tooth with a credit card (number one motor winding tool!)
Thanks for your eyes!
I popped for the sealed ceramic for a couple of my favorite planes.
The rest will get the sealed 99 cent bearings.
Great. This is one of the gotchas with this little motor.
I have seen three different combinations of bearing sizes.
And now four different combos with the big bearing in the front and in the back
I'm running the Assassin on an 8 turn with the regular 7x6 prop... I may need to prop down and see if I get better flight times. 32 apms and 412 watts!
|Jul 27, 2014, 01:26 AM|
|Jul 27, 2014, 09:25 AM|
But after flying the Scythe for awhile with 7T and then flying the bigger planes immediately afterwards, I was saying - what happened to the performance?
So that's why I rewound a motor for my WM to 8T using a 6x6 prop.
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