I am trying to make a custom half-round molding on the router table,
and then drill and counterbore holes for 1/4-20 bolts. I am wondering
what order I should do it in: do I drill first and then rout, risking
tearout on the inside of the holes (their about 5/8" dia) or rout the
half round and then drill, with the holes possibly shifting from side
to side. The holes need to be fairly precise as the bolt connects to a
metal bar that doesn't have much leeway, and the wood has to be fairly
smooth. Any ideas or comments?
Chances are good for no tearout over the countersinks. Test on scrap
first. If you're using bearing and a bearing might roll over a hole you
have no choice but to drill after routing.
Notwithstanding, drilling after routing may be a necessity as sanding
and such may reduce the pre countersink diameter.
And to be sure, if your pre drill 1/4" pilots only and follow with
countersinks after routing, (requires piloted countersinks) you will
clean up any tearout created during the rout.
More on routing and drilling?
http://www.patwarner.com
Bolts in a molding? I'd probably use biscuits, glue and clamp the
molding for a day. Or if you are fastening it to metal use epoxy.
Anyway, one choice would be to drill small holes first, route the
half-round, then countersink.
On 14 Apr 2005 20:17:18 -0700, "woodworker88" <[email protected]>
wrote:
>I am trying to make a custom half-round molding on the router table,
>and then drill and counterbore holes for 1/4-20 bolts. I am wondering
>what order I should do it in: do I drill first and then rout, risking
>tearout on the inside of the holes (their about 5/8" dia) or rout the
>half round and then drill, with the holes possibly shifting from side
>to side. The holes need to be fairly precise as the bolt connects to a
>metal bar that doesn't have much leeway, and the wood has to be fairly
>smooth. Any ideas or comments?
On 14 Apr 2005 20:17:18 -0700, "woodworker88" <[email protected]> wrote:
>I am trying to make a custom half-round molding on the router table,
>and then drill and counterbore holes for 1/4-20 bolts. I am wondering
>what order I should do it in: do I drill first and then rout, risking
>tearout on the inside of the holes (their about 5/8" dia) or rout the
>half round and then drill, with the holes possibly shifting from side
>to side. The holes need to be fairly precise as the bolt connects to a
>metal bar that doesn't have much leeway, and the wood has to be fairly
>smooth. Any ideas or comments?
how about drilling the holes first, and "pinning" them to a piece of scrap with
dowels or toothpicks...
run them through the router using the stock as a jig, then countersink the holes
before mounting?
mac
Please remove splinters before emailing
woodworker88 wrote:
> I am trying to make a custom half-round molding on the router table,
> and then drill and counterbore holes for 1/4-20 bolts. I am wondering
> what order I should do it in: do I drill first and then rout, risking
> tearout on the inside of the holes (their about 5/8" dia) or rout the
> half round and then drill, with the holes possibly shifting from side
> to side. The holes need to be fairly precise as the bolt connects to a
> metal bar that doesn't have much leeway, and the wood has to be fairly
> smooth. Any ideas or comments?
>
Try drilling the holes first, then fill with a piece of dowel and sand
smooth, then run piece thru router.
Finally, remove remaining dowel piece with a gimlet exposing counter bores.
HTH
Lew
PS: You can always use some varnish as glue to hold dowel in place while
machining, if necessary.