Original poster: "Antonio Carlos M. de Queiroz" <acmdq@xxxxxxxxxx>
Tesla list wrote:
Original poster: "D.C. Cox" <resonance@xxxxxxxxxx>
We have used both black delrin and black (smoked color) acrylic
with no HV leakage or tracking.
When you tap the acrylic for the fasteners be sure to use kerosine
if in a lathe. Also gently (very gently) anneal the acyrlic after
tapping in your oven to prevent the sharp tap edge points from
expanding into cracks that will radiate to the edge of the acrylic
and cause fastener failure.
I have never seen this happen. Drilling and tapping acrylic really needs
some lubricant, or the acrylic melts or cracks too easily. Annealing
acrylic is a temerity, as it shrinks and deforms with heat. The heat
developed by tapping (with lubrication) is probably enough.
Antonio Carlos M. de Queiroz