What tooling to drill lots of 10mm holes 45mm deep?

[Lee Roberts]

Hi Alan welcome to the forum!

Is the blowout on the bottom because your not using a spoil board under the stock? It sounds like it. If you do the above that should stop the blowout and allow you to get the depth you want so in this case a through cut/hole.

Is the feed speed of 50mm/min the plunge speed or the speed your moving to the next hole? It sounds like the hand drill is spinning the bit to fast.

Fitting the router would be the better option I would think, you could then (hopfully) setup the correct rpm for that size bit, if your doing drilling like that then a nice sharp slot drill would serve you well, however what you should probably be doing is something called peck drilling, this is where you drill down into the hole 1 or 2mm a time, rasing back out of the hole after each plunge/cut, this helps to clear the chips, keep the cutter cool and do the drilling in a nice controlled way.

You could go with a smaller end mill say something like half, so a 5-6mm diameter, you would then machine out the holes to the 10mm size you need. A standard end mill would work but a drill bit would be better as end mills are designed for cutting sideways rather than drilling.

.Me