I have a table saw with two stamped metal wings.
I found a cast iron table from an old saw at a garage sale for $3. Cleaned
up it should make a great wing.
Unfortunately it only has holes on three sides, and I need them on all four.
(Since both it an my saw are craftsman, I am hoping the other holes line up,
but better check before I do any new drilling...)
Any advice on drilling additional holes? I have an industrial drill and a
big pile of drill bits I got when a tool shop went out of business, but it
looks pretty thick. I know I have to keep oil on the surface, anything
Cast iron is relatively easy to drill. Make sure that the holes
are where you want them. Use a center punch to give yourself a
good starting point. Use a good fresh bit about a 3/16 drill
bit. Keep steady pressure and a slow speed. As long as the bit
is making chips or curls everything is fine, just concentrate on
steady pressure and drilling straight. It should go through
fairly quickly. Follow with the appropriate bit for the size bolt
you are using.
You probably do not need lubricant.
Keep the whole world singing . . . .
DanG (remove the sevens)
the post from DanG is correct, but one caution is that thin section castings
can have chill spots, which are very hard. If you have a hole that is
particulary difficult, and the
drillbit dulls, chill iron is probably the culprit. If that hole location
is a must, you may need to use
a carbide bit, slower rpms, and some lubricant.
Slower rpms is generally not advisable when using carbide tooling........
Not gonna get into the "why" part of the deal here--so you hafta just trust
me on it this time is all, but in short, I guess I'll just
A traditional type carbide twist drill is hard to find in retail (and
expensive) so I think you could try it with a new masonry point. Cast iron
doesn't need much in the way of chip control geometry.
Try it first with a regular drill bit, though. The iron might machine like
Most often it will. If a masonry bit is required it could be a disaster
without a pilot hole. Masonry bit are usually flat on the tip (in
center) so *that* part doesn't really cut and it will often elongate the
hole and wander.
Couple more things from an old machinist. Make sure your drill does not
have a flat spot in the webbing. If it does it needs a pilot hole or it
will want to wander. With cast iron, even water is a suitable coolant.
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