Quote:
Originally Posted by Wavytone
Ha... I was going say hang angle grinder at the end of a pendulum length = desired radius and let it swing !
Only snag is angle grinders don’t play nice with water  |
Been there, about 12yrs ago making the 12". I attached the angle grinder to a bit of 3x2 and hung it from the apex of my roof via a ball joint.(There is a pic of it in the Brisbane Astronomical Soc newsletter) Went ok for the first pass but despite running water over it the glass began to splinter and I ruined it.
I've never had a problem with water either then or now. You don't turn the tap on full blast, just a trickle over the glass. The water gets flung off once it contacts the blade, nowhere near the electrics.