Diy Brushless Spindle

[Jonathan]

[QUOTE=njhussey;30976
How does the motor work with a prop on it in a plane then? There is a circlip to stop the shaft pulling out if the motor is used as a pusher or reverse mounted but nothing to stop it being pulled out apart from the bearings and the grub screw as you say. This seems to be enough for a model so I'd have thought it would have been enough?[/QUOTE]

On a plane the magnitude axial force (thrust) from the motor is much smaller than in our application, plus accuracy (end-float, radial clearance etc) is pretty much irrelevant for just spinning a propeller. The bearings will wear out much faster than if they used angular contact beraings, but the cost isn't justified. If sufficient axial force is applied to a deep groove bearing the balls will ride up the sides of the rings outside of the superfinished races on to the rougher (relatively speaking) area of the ring, causing increased wear.

I'll reply to the rest when you've done a drawing...

[blackburn mark]

i personaly wouldnt get to bogged down in all the rocket science... make sure you get some tension in your balls and make sure your shaft cant easily rotate in the bearing bore (loctight the nose bearing if its a tad slack) and all should be fine

any slack will result in balls skidding or a sypathetic rolling rotation/vibration between your shaft and your bearing bores
(a very short life span for either and poor finishes)
iv used super cheap skate bearing on my er11 with aprox 2kg of tension between the two and its still going strong
if you get any high pitched squeals/squeaks etc when the spindle runs up or down you need to fettle

the beauty of these spindle is they are cheap n simple
iv seen threads on diy spindles that are works of art and that have followed the theory to the letter, however, i get good finishes in acetal and alli so seen no point in getting all posh if the aim of the game is to get yourself up and cutting :)

PS: your bellville washers are bagged n ready neil, i just need to get off my arse and post them :(

[njhussey]

PS: your bellville washers are bagged n ready neil, i just need to get off my arse and post them :(

Cheers Mark, no huge rush as I've still got lots to do on the router (everything apart from the base!!) which I'm hoping to break the back of over the weekend.