People seem to get quite along way with Dremels on machines like the Shapeoko. I also looked at whether I could use a brushless motor for a spindle. The problem seems to be that the bearings in most brushless motors aren’t built for side loads like you’d get in a CNC machine. I did wonder about using one of these: http://www.aliexpress.com/item/ER11-motor-shaft-extension-rod-shaft-5mm/1199616232.html on a motor with a 5mm shaft. That would let you use any accessory (with a suitable collet) and might be fine for light loads. I’d be interested to see what others rekon.
I think by the time you’ve combined the cost of brushless motor, controller, adapter and collet, you might be near the cost of one of the cheap ebay spindles, which are at least built for the task.
Hi Stephane, I too am new to CNC and am building my own machine. Look at my video and you will see a 400 watt spindle motor that you can buy on Ebay for under USD$100. It is specifically for CNC and some of them have 3 or even 4 bearings for handling increased side loading.
Good luck with your machine and post a video…Cheers!
I would use your dremel as several have suggested. You can use it to create a better one down the road. I have seen several people with spindles created with R/C car brushless motors, an ER11 collet, and some aluminum!
Had a dremel in a Shapeoko 2, but switched to a decent spindle: Kress FME 1050. The dremel is not bad (especially when you already got one at hand) while you are learning to handle your machine, but soon more power is desireable.
@Werner_Drasch
I thought the big problem with Dremels is that they are just not designed for fixed use. They have a lot of slop, and run out. They’re made to be held in a hand.
@Paul_Frederick as I never measured any of these factors I can’t give a qualified answer to that. But you can mount them with relative ease (made my mounting brackets from hardwood I had on hand) and achieved fairly good workpieces again mostly from wood or hdpe. I must confess I have also seen others do astonishingly detailed things with dremels on shapeoko’s. But my main point would be that they would deteriorate quite fast and your mentioned shortcomings in preciseness would show relatively soon, even if they would not have been too bad at the start. I had the dremel only for two or three months or so and realized it getting worse towards the end. Especially those bearings are not so great at all.