Ron,
I think masonry bits might be a bit flexible...
I'm not sure what kind of accuracy you need but if you drill the hole then put it on an arbor it may help.
I'm not horribly experienced but I'd do it in this order.
center drill
drill to size
ream if you have one
part off
chuck a piece of bar and turn down to the size of your hole leaving a lip to but the part up to
then either
1. glue it to the mandrel and cut both tapers
2. press it into the mandrel with a live center and cut the taper closest to the chuck
rotate and repeat for the other taper
leave the mandrel in the chuck after it's turned to size - I'm assuming you are using a three jaw.
YMMV
and make sure you have fun doing it :-}
- Scott
I think masonry bits might be a bit flexible...
I'm not sure what kind of accuracy you need but if you drill the hole then put it on an arbor it may help.
I'm not horribly experienced but I'd do it in this order.
center drill
drill to size
ream if you have one
part off
chuck a piece of bar and turn down to the size of your hole leaving a lip to but the part up to
then either
1. glue it to the mandrel and cut both tapers
2. press it into the mandrel with a live center and cut the taper closest to the chuck
rotate and repeat for the other taper
leave the mandrel in the chuck after it's turned to size - I'm assuming you are using a three jaw.
YMMV
and make sure you have fun doing it :-}
- Scott