Huey52 said:
Similarly [member=74278]Packard[/member] I have drilled many 3/4" crisp holes with nary a blowout, even when I can't use a backer board. The WoodOwl brand of "overdrive" auger bits is stellar (so named as they cut so easily they save drill battery power; also hex shank assured torque).
I have a spacing jig employing a steel bushing as laid out in the below linkage.
Excellent small business source:
https://taytools.com/products/3-4-doweling-jig-kit?_pos=7&_sid=992da4c85&_ss=r
[member=57948]ChuckS[/member] I swear by Fisch ... and Rob Cosman. ;-)
I used that same bit with the pictured bushing (From Amazon). But I see it has been discontinued. I liked the extra length and the collar at the top.
I used a “foolproof” spacing method for each of 3 tables. I screwed down a piece of 3/16” thick peg board on a piece of MDF. Both oversized so I could cut off the screw holes.
I then taped off (masking tape), all the holes I did not want to drill.
I then uses a Vix bit to drill pilot starter holes. I used a 4” on center spacing.
Then a small holder for the bushing to keep my holes perpendicular to the board. I set the auger point into the starter holes and drilled. Tedious work.
On each of the three tables I managed to have one hole out of alignment. In each case at a different spot. Obviously human error, but I cannot figure out how I did that.
The exact spacing is not frequently required. To resolve the issue, I used a marking pen to encircle the offending hole. If the spacing is an issue, I move around on the table to avoid that hole.
I still have not figured how my “foolproof” method, fooled me.
I have spade bits, but I don’t think they would do well in a bushing (though I never tried).
This is the bushing I used: