Diy Brushless Spindle

[njhussey]

Thanks for the info Mark I'll have a look at that one. Instead of cheap skate bearings could I not use a single double row AC bearing, would I have to pre-tension it? Saying that I've skate bearings coming out of my ears as I'm planning on using them as the linear bearings on all my axis ;) The only problem I can see for me is making the bearing housing, I looked at our lathe this morning and the tooling is crap as it's only used to take the raised face off flanges etc, not sure when it last had a service either. Will get some Ali bar offcut and have a play I think. Hope it's ok as I was planning on machining my leadscrews on it!

[njhussey]

From a quick search on tinternet it seems that most double row angular contact bearings seem to start at 10mm ID so looks like its the skate bearing route for me...

[Jonathan]

Yes I looked for a while for 8mm angular contact bearings but only found one supplier, on eBay in america and not cheap. That was for single row, couldn't find any double row that size.

http://www.ebay.co.uk/itm/708A-8mm-S...0#ht_560wt_905

I wouldn't expect normal bearings to last long if you're drilling ... but nobody really cares as they're so cheap.

Also you can get ER16 collet chucks with 8mm shank:

http://cgi.ebay.co.uk/ws/eBayISAPI.d...ht_4690wt_1080

Saying that I've skate bearings coming out of my ears as I'm planning on using them as the linear bearings on all my axis ;)

That's slightly worrying - depends how you go about it.

...making the bearing housing, I looked at our lathe this morning and the tooling is crap as it's only used to take the raised face off flanges etc...

Poor workman blames his tools :whistling:

[njhussey]

Yes I looked for a while for 8mm angular contact bearings but only found one supplier, on eBay in america and not cheap. That was for single row, couldn't find any double row that size.

http://www.ebay.co.uk/itm/708A-8mm-S...0#ht_560wt_905

Well what the hell....decided to buy a couple of these as they will last longer and will be better than the skate bearings. Will get the other bits as and when I sell more velcro on fleabay and get more money in.

Mark / Jonathan are either of you up for making a bearing housing for me?? For a price of course....

[blackburn mark]

Well what the hell....decided to buy a couple

have you worked out a posh (easy) way to keep the lube in and the crap out of these un-sealed bearings ? its one of the reasons i havnt used mine yet :)

Mark / Jonathan are either of you up for making a bearing housing for me?? For a price of course....

im up to my neck at the moment so hopfully jonathan will pick this up... you will need two stepped washers making unless you can find belleville washers that are 22mm (just under 22mm so they clear the inner housing)
it is probably a good idea if you do a drawing so you can thrash out any problems you might have

[njhussey]

have you worked out a posh (easy) way to keep the lube in and the crap out of these un-sealed bearings ?

I was going to get them and then spend the time whilst they wing their way from the US looking at ways to do it :-)

im up to my neck at the moment so hopfully jonathan will pick this up... you will need two stepped washers making unless you can find belleville washers that are 22mm (just under 22mm so they clear the inner housing)
it is probably a good idea if you do a drawing so you can thrash out any problems you might have

I might buy a 50mm dia offcut of Ali and have a tinker on the lathe at work, will check to see if we have any boring tools to play with!

[blackburn mark]

I was going to get them and then spend the time whilst they wing their way from the US looking at ways to do it :-)

a man after my own heart :)

I might buy a 50mm dia offcut of Ali and have a tinker on the lathe at work, will check to see if we have any boring tools to play with!

thats more like it :) if you over size the bore just slap a bit of epoxy in there it should easily take the cutting force (just dont use your posh bearings on that one lol

[John S]

Yes I looked for a while for 8mm angular contact bearings but only found one supplier, on eBay in america and not cheap. That was for single row, couldn't find any double row that size.

In the smaller sizes they are known as magneto bearings, Arc keeps them, ask for E8's