How to Undermount a Drop-In Kitchen Sink Part 1 How to Undermount a Drop-In Kitchen Sink Part 1

What You'll Need
Jig or Hole cutting saw
Fine tooth metal file
Tape measure

To install a drop-in kitchen sink, you simply need to cut dimensions that will fit into your counter top and be properly spaced from your counter's outer edge. When dealing with a drop-in sink, you will need to ensure that your cut is accurate, as most have underpinning to keep them from falling out of place once it is installed. If you cut to the opening too wide, it can effect the final securing of the unit to the counter to keep it from moving. The most important thing here is not to cut too large of a hole that the counter slips through, or too small of a hole that you have to cut it all over again to make it fit. You can prevent this from taking some precise measurements before you even begin.

Step 1 - Taking Inside Measurements

Take all the proper measurements from your drop-in kitchen sink. These measurements are going to be used to figure the proper cut for the hole in your counter top and allow you to provide enough space for the securing brackets below to properly lock into place. The edge or lip of your drop-in sink and the actual mounts will determine how tight of a cut you're going to need. Measure this cut within a ½-inch of the actual bowl and hardware of the sink to prevent overcutting and loss of room for your brackets.

Step 2 - Cut the Hole for the Sink

Use your square and tape measure to mark out the place where your drop-in kitchen sink will go onto the counter's surface. Use a drill with a bit the width of your jig saw to cut a starter hole on an inside measurement to avoid ruining the outside edge. Be sure to use safety goggles to prevent slag from getting in your eyes.

Once the hole is cut out, use your file and sandpaper to soften the inside edges of your hole to prevent getting cut by edges going forward.

Step 3 - Secondary Precautions

When cutting the hole for the drop-in kitchen sink, double-check to make sure there is nothing below where you're cutting, such as electrical wires for garbage disposals, dishwashers or pipes that have yet to be installed. It take very little under pressure to cause a jig saw blade to snap, bend or even go off course, which would ruin your project and the counter top.

It is also a good idea to make sure that any underside mounting bracket that may have to be screwed in is not longer than the thickness of your counter. Otherwise, you will end up with sharp points sticking out of the counter surface once you're done.

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