LumberJocks

Drilling Cast

  • Advertise with us

« back to Power Tools, Hardware and Accessories forum

Forum topic by Charlie75 posted 04-17-2014 12:24 AM 787 views 0 times favorited 8 replies Add to Favorites Watch
View Charlie75's profile

Charlie75

286 posts in 1731 days


04-17-2014 12:24 AM

My Delta band saw project is coming together very well. The wheels and bearings are all on and the table is back on. Today I ordered one of those safety switches and really want to put it on the post that attaches the top to the bottom. The problem I have with it is that part is cast and I have no experience drilling cast. I am not afraid to try it but I wanted to run it past some of you first.

Charlie

-- Charlie75, Alto


8 replies so far

View patron's profile

patron

13538 posts in 2807 days


#1 posted 04-17-2014 12:43 AM

i drill tables and cast iron
for jigs and switches and fences all the time
when needed

work my way up from a smaller hole first
to the larger size
standard ‘jobber’ twist drills
(the ones most common in stores as index sets)

just watch for ribbing and thick spots in the back of the casting
so your washers and nuts don’t sit at a sloped angle

watch pushing to hard when they start to go thru
as the bits get caught and can twist sideways
cast can be threaded too
just use the right drill recommended for the tap size
and easy does it back it up to clear the tap
and maybe a little 3 in 1 oil to lubricate

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

View crank49's profile

crank49

3981 posts in 2437 days


#2 posted 04-17-2014 01:00 AM

“The post that attaches the top to the bottom”?
Are you referring to the main frame that connects the top of the machine to the bottom of the machine?
That is the most highly stressed component of the machine.
Cast iron has very little strength in tension.
It has mush more strength in compression.
If you plan to drill a hole in the main column you would be wise to put the hole in the middle of the web where the stresses are neutral or in the side that is in compression.
The side in compression would be the side nearest to the blade.

-- Michael: Hillary has a long list of accomplishments, though most DAs would refer to them as felonies.

View Charlie75's profile

Charlie75

286 posts in 1731 days


#3 posted 04-17-2014 01:27 AM

Patron, tapping is a part that I fogot to mention. The reason for the drilling is I want to attach a plastic electrical box in which to put the switch.

crank49, That is the part that I talking about. I did a lousy job of describing what I had in mind. Thanks for the tips. I will pay attention to all of them.

Charlie

-- Charlie75, Alto

View Shawn Masterson's profile

Shawn Masterson

1297 posts in 1414 days


#4 posted 04-17-2014 01:36 AM

you know the old phrase A picture is worth a thousand words.

View gfadvm's profile

gfadvm

14940 posts in 2156 days


#5 posted 04-17-2014 01:52 AM

Charlie, You should be able to attach that switch box with some self tapping screws.

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

View patron's profile

patron

13538 posts in 2807 days


#6 posted 04-17-2014 02:01 AM

as andy points out
tapping screws should be fine
you might need to sacrifice a screw or two
as the ‘drill’ point is only so long
and the treads may be compromised (worn down)
by the time the tip is thru
so just take that one out
and insert another

easy does it

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

View MrUnix's profile

MrUnix

4234 posts in 1665 days


#7 posted 04-17-2014 06:26 AM

A PO of my bandsaw mounted the switch box on the arm like you describe, but drilled the holes where the two cast pieces come together. A standard electrical box was attached using the two holes shown below.

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

View Charlie75's profile

Charlie75

286 posts in 1731 days


#8 posted 04-17-2014 02:42 PM

Along this same line I was wondering where some of you ran the wires too. I had originally thought I would run mine down the hollow casting but that would be almost impossible. So I am looking for ideas. Maybe I will just run the wire down the back of the casting in either conduit or just with wire clips of some kind.
Charlie

-- Charlie75, Alto

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com