lathe milling spindle?

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bertie_bassett:
Had a spare couple of hours today waiting to pick someone up so decided to make use of my time and have drawn up a scale drawing of what iv made, shows most of the important measurements a d details

vtsteam:
Oh, good choice for motor. Those are made by EMP -- same as mine, and also Simon's bike. Bertie, what size ESC are you using?

I'm guessing that you'll probably want a 24V power supply. Usable voltage depends where yours develops enough power for mill and material chosen. 6364 k250 is definitely both larger and slower than my motors, which is good.

I think with solid carbide you/we will be able to mill steel with an 1/8" mill at least. if you have the power at the voltge for you, hopefully larger mills -- that's what I'll be interested to see when you're operational. 1/4" (or better) in steel would definitely be nice.

Incidentally, aircraft load these motors in thrust. That's what they're designed for. With an 1/8" end mill the motor will not be heavily loaded in thrust or it will snap. Not saying angular contact bearings aren't preferable, but I do wonder if they are absolutely necessary on my own motors. Likewise with a very small range of usable mill sizes I probably will have, I also wonder if a set of ER-11 collets was necessary for me! Mine might end up being a pretty simple conversion.

Arbalist:
Only just seen this thread. Nice idea Bertie, I particularly like the motor choice as I've been wondering what you could do with these motors!

mattinker:

--- Quote from: bertie_bassett on March 22, 2015, 08:11:49 AM ---I managed to get hold of a xyh 6364 from giant shark, shows as out of stock but if you search for c 6364 or n6364 you can find the same .motor in stock?? Mines the 250kv one as its the lowest kv around. Should give a max speed of 3k rpm at 12v. Though I can rewind ut for a lower kv If required.

--- End quote ---

Thanks for the n 6364 tip, I've ordered one! That will be all for the budget this month, I'll see about the bearings and the esc next month.

Regards, Matthew

bertie_bassett:

--- Quote from: vtsteam on March 22, 2015, 09:53:39 AM ---Incidentally, aircraft load these motors in thrust. That's what they're designed for. With an 1/8" end mill the motor will not be heavily loaded in thrust or it will snap. Not saying angular contact bearings aren't preferable, but I do wonder if they are absolutely necessary on my own motors. Likewise with a very small range of usable mill sizes I probably will have, I also wonder if a set of ER-11 collets was necessary for me! Mine might end up being a pretty simple conversion.

--- End quote ---

im sure iv seen at least one person not bother with extra bearings, or even collets, just outing a milling bit directly into the motor!

iv also seen other with plain ball bearings used to take up sideloading. In my case I couldn't see a reason not to use the double row AC bearings so that's what I went with.

for your motor size I think skate bearings may be the easiest option?

you do need some sort of bearing housing, even if its just to hold onto the thing! got to remember the outside spins round!
as far as I can make out the usual application for these motors is for the rotating bell to be the front end, with a prop shaft bolted to it. the original motor shaft seems only to be there for the bell to rotate on ( why it sticks out the back end iv no idea though)
in our case I think we are actually using the motor backwards ?

a lot of the designs out there are for home made cnc machines where they seem to be striving for perfection when it comes to stiffness and runout. personally I think its overkill for hobby use. if it spins and cuts without shaking itself to bits id say its good!

glad you found the motor matthew, took me ages to find one in in stock. no idea what the differenc ( if any) is between the n,c and xyh is

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