Fingers crossed it'll cut ally

[blackburn mark]

yo jonathan,

i was terrified of turning down an over sized shaft so i spent weeks looking for the right size, its being shipped as we speak

im gutted you didnt find a 150mm one, im convinced it would have been easy to stick double row A/C on the nose in a shallow housing,, ill find out as soon as my shaft turns up ill start doing a bit of turning

im not totaly convinced a double row A/C bearing will be tight enough for ally, the ones iv got dont feel like they have that much pre-load, i might end up stacking the two of them

4th axis... mmmm im thinking a 100mm rotary table with my 5th stepper melded to it

im not sure anything is off topic,, is it?

[Jonathan]

i was terrified of turning down an over sized shaft so i spent weeks looking for the right size, its being shipped as we speak

Hah, I was pretty scared dismantling this motor. It was all glued/loctited together and needed some persuasion with a hammer.

im gutted you didnt find a 150mm one, im convinced it would have been easy to stick double row A/C on the nose in a shallow housing,, ill find out as soon as my shaft turns up ill start doing a bit of turning

There are 150mm ones, but they're more than twice the price of the 100mm. I could probably extend the 100mm one if it came to it - definitely some thinking to do before I buy anything!

im not totaly convinced a double row A/C bearing will be tight enough for ally, the ones iv got dont feel like they have that much pre-load, i might end up stacking the two of them

I see, so you don't think the ones that are currently in my motor would be up to it? Maybe I could link this motor to the existing milling machine spindle via a pulley...then I needn't worry about angular contact bearings. Having said that I don't know if the bearings in the spindle of my machine are up to 6000rpm.

4th axis... mmmm im thinking a 100mm rotary table with my 5th stepper melded to it

Yep, that's what I did except with a 150mm vertex rotary table. It's excellent for making pulleys:



And making 4th axis'

im not sure anything is off topic,, is it?

:) well in that case this is the 4th axis/lathe design I've started making:





I'm using two tapered roller bearings in that. The gold things are solenoids to create a sort of disk brake which I'm hoping will hold it steady enough for me to mill will it aswell as using it as a lathe by swapping to a bigger motor...the brushless one.