In the future use the right tool for the job. Get a device called a inhibit. It is specifically designed for drilling holes in thin metal sheet like your aluminum and will do a great job on acrylic sheet. The but will drill multiple sizes of holes and no pilot nipple is necessary. You should be able to get these art Lowes, Home Depot or Harbor Freight.. also note that Plexiglas is a DuPont trademark for acrylic. Don't insist on Plexiglas unless you need that specific chemical formula. Go to the home improvement store and buy acrylic - it will bee much cheaper and do the job just fine.
In the future use the right tool for the job. Get a device called a inhibit. It is specifically designed for drilling holes in thin metal sheet like your aluminum and will do a great job on acrylic sheet. The but will drill multiple sizes of holes and no pilot nipple is necessary. You should be able to get these art Lowes, Home Depot or Harbor Freight.. also note that Plexiglas is a DuPont trademark for acrylic. Don't insist on Plexiglas unless you need that specific chemical formula. Go to the home improvement store and buy acrylic - it will bee much cheaper and do the job just fine.
Sorry, that should say unibit. Its a cone - shaped bit with steps for different size holes.
Thanks for the tip. We have a Home Depot nearby. Hopefully they have one.
drilling backs wareds is what did it