I enlarged the existing holes. I think I used a step bit.

Graham Stewart
Agile 1976
gstewart.gm at gmail.com

On Fri, May 3, 2024 at 5:24 PM ROGER PIHLAJA <roger_pihlaja at msn.com> wrote:

> Hi Peter,
>
> Assuming you can get at the back side of the hole, the best practice is to
> drill a small pilot hole thru first.  Then, drill the final hole diameter,
> starting on the interior and drill about halfway thru.  Finally, finish the
> hole from the outside.  Use a sharp spiral bit and don’t use a wood boring
> spade bit.
>
> Roger Pihlaja
> S/V Dynamic Equilibrium
> 1978 Sanford, MI
>
> Sent from my iPhone
>
> > On May 3, 2024, at 4:25 PM, peter beckerman via Rhodes22-list <
> rhodes22-list at rhodes22.org> wrote:
> >
> >  Hi All,   I haven't gotten any real experience working with fiberglass
> and need to drill a hole into my cabin top.Is there anything special I
> should be aware of to avoid chips or cracks?  Any preferred type of drill
> bit (besides sharp)?  Better to run the bit fast or slow?
> > Thanks,Peter
>