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Specialty wood drilling/boring bit  RSS feed

 
Richard Cobbs
Posts: 16
Location: Yalaguina, Nicaragua
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I built a timber frame house many years ago and used homemade steel connectors that were hidden inside the beams. I connected the beams to the posts with 1/2" bolts. In order to hide the bolts, I used a standard 12" long by 1/2" diameter twist drill with a 1 1/2" forstner-type collar that attached to the 1/2" bit with set screws. This allowed me to drill the 1/2" hole completely thru the beam and bore the 1 1/2" hole in about 1 1/2" on one side, then using the 1/2" hole on the other side as a guide, bore the second 1 1/2" recess. I was then able to use standard washers on both ends of the bolt and cover the holes with 1 1/2" dowels. I would like to do something similar using round wood and star-type timber washers. Does anybody know where I can get this type of boring tool? It is essentially a flat faced forstner bit with a 1/2" hole in the middle that is secured to the 1/2" bit with set screws.
 
Chadwick Holmes
Posts: 618
Location: Volant, PA
27
forest garden fungi goat trees wofati woodworking
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This is one of the only places I know that still has these

https://www.dictum.com/en/tools/woodworking-metalworking/routing-drilling-tools/wood-metal-masonry-drills/forstner-bits/707044/fisch-countersink-o-50-mm

Hope that helps, nice that you are going 1/2 because these are metric....
 
Richard Cobbs
Posts: 16
Location: Yalaguina, Nicaragua
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Thank you very much, Chadwick!
RWC
 
Chadwick Holmes
Posts: 618
Location: Volant, PA
27
forest garden fungi goat trees wofati woodworking
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You are welcome! I thought you might like that!!!
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