CNC Router V1.0 (For Cutting Multiple Materials)

[Lee Roberts]

I think you'll be fine, what may happen is you get chatter from the drill so may end up with the not so perfect edge.

Also you don't really need to buy proper counter bores, the right size drill bit used in the same way works great for pretty much the same effect, do you really need need flat bottom holes for the cap head to live in?

The timing is good on this one because I'm currently in the process of doing the same myself, stepping up in size, cheap drill press, simular sizes being dealt with, here's some pics:







I'm stepping up to 15.5 and 20mm for the screw clearance hole (the very middle one) :). I can show the bigger holes if you really want but they came out pretty decent, don't use a step drill and if you don't mind go for quality drill bits.

If you do end up with a less desirable finish on the bore OD, you can always add a chamfer with a counter sink or again an over sized drill bit.



Edit: Just to add, I prefer to go with Dormer for drills and taps after using them after cheap crap and the difference is night and day, however even on eBay Dormer comes at a price, check out Osborn/Warwick/Heller/Goliath, look up Steve (cncpoorboy) on eBay he's got some smashing deals for what what looks to be old new stock, new stock and the stock is all those shiny metal things we're so attracted to.

.Me