Fingers crossed it'll cut ally

[blackburn mark]

though id have a play with my attempt at an engraving spindle
the motor is 4000kv so in theory it should run at 48000rpm at 12v
i managed to find an extra long engraving bit 115mm and mounted it straight through the motor and put three plain ball bearings at the nose




i ran it flat out for a couple of min's and both the motor and the bearing housing got pretty hot pretty quick
im not overly worried about the motor getting hot its to be exspected IMO but i think the bearings on the nose are soon going to be way above 110 degrees..... i think ill test it to destruction before i look at water cooling i just cant bring myself to do it just yet, ill admire its simplicity and form for a while longer and have a think about it :)

another problem i might have... when i run it up i can hear a bearing skidding now and again, im pretty sure its one of the motor bearings (only paid £7.50 for it new) so that will need upgraded bearings pretty soon

has anybody had a go at sharpening an engraving bit ?????? this one cost me more than the motor