Cutting a larger tap hole in composite sink?

[devs]

Hi guys I’ve bought a Composite sink that’s already had a tap hole drilled can you share any tips on how to increase the hole size? Many thanks

 

[Newboy]

Cut a piece of ply or MDF with the hole size required.

Carefully clamp the cut piece over the hole position and use the piece to guide a holesaw to cut the required tap hole.

 

[devs]

Perfect thanks for the help mate! But without sounding too much of a novice how clamp this, wouldn’t it get in the way of the hole saw?

Cheers

 

[devs]

Scrap that!! I’ve just woke up and understand thanks again

 

[Harry Bloomfield]

A suitably sized step drill would obviate the need for ply or MDF, assuming the hole is in the correct position, but just the size needs increasing.

 

[devs]

Thank you, I’ll check them out!

 

[Harry Bloomfield]

Thank you, I’ll check them out!

You can buy a cone drill, which has a steady taper, to enlarge holes, but on thick material they leave a cone shaped hole.

A step drill, is similar to a cone, but has a series of stepped sizes. Aldi/Lidl sometimes have a set of three sizes of drill on offer, in a case, for not a lot of money.

 

[reds42]

Another way of guiding a bigger hole saw through an existing hole is to stack two cutters together.

Put the larger hole saw on the arbor first, then screw on one the same size as the original hole which will act as guide bit.

 

[devs]

Nice! Thanks mate

 

[dilalio]

Another way of guiding a bigger hole saw through an existing hole is to stack two cutters together.

Put the larger hole saw on the arbor first, then screw on one the same size as the original hole which will act as guide bit.

This tip has saved me lots of times

 

[Keithmac]

Another way of guiding a bigger hole saw through an existing hole is to stack two cutters together.

Put the larger hole saw on the arbor first, then screw on one the same size as the original hole which will act as guide bit.

Excellent idea, I'll have to remember that one!.