Welding Tips and Tricks

Seasons greetings all.
I am trying to notch 1" stainless .065 wall tubing on my drill press and keep breaking the teeth off of the hole saw. I have the drill press set to the lowest rpm. A machinist friend said I would need a mill to do this to get the rpm down lower. Can't afford that purchase right now. I am using bi metal hole saws at the moment. Any recommendations from anyone on better hole saws or techniques ? Thanks.
Geoff

Geoff,
Try leaving your tubing a little long and cut a full circe with the saw so it quits grabbing the open end. You can cut it half way through the circle after it's been drilled. I hope this makes sense.

Len

I use some carbide cutters from Michigan drill that work excellent on stainless, hold up very well. Like a hole saw on steroids...

Every hole saw should have a rpm chart for the selected material and according to its diameter otherwise look on the net for more information.

Secure the pipe in a way that the part you want to drill is as close to the end of jaws of the vice grip as possible to prevent vibrations. The most problematic is the start since the teeth of the hole saw are quite big for cutting thin walled pipe.

Go by the feeling on your hand and use a lot of coolant or oil. Otherwise you can get hardening of the material and then you have a problem.

Thin walled ss pipe and a hole saw is not a match made in heaven.

The set I have is HC690S they sell bits individual...

Hc690 1 is what you'd want

Rick_H,

Where could I source those bits?

I don't do tube notching, but I often do off-square drills up to 2 3/8" in vessels and heads for nozzle installation, in 304 up to 7/16"

Steve S

Otto Nobedder wrote:Rick_H,

Where could I source those bits?

I don't do tube notching, but I often do off-square drills up to 2 3/8" in vessels and heads for nozzle installation, in 304 up to 7/16"

Steve S

Steve, youll love these, I can drill a 1.50" hole slide a tri-clover ferrule in and weld...it's that nice of a hole. Here's a link to the web site I know they have a 2" you'd have to call for something larger. I use a lot of lube and they hold up very, very well.

http://www.michigandrill.com/search/index.php?s=Hc690

Rick_H wrote:

Otto Nobedder wrote:Rick_H,
Where could I source those bits?
Steve S

Steve, youll love these, I can drill a 1.50" hole slide a tri-clover ferrule in and weld...it's that nice of a hole. Here's a link to the web site I know they have a 2" you'd have to call for something larger. I use a lot of lube and they hold up very, very well.

http://www.michigandrill.com/search/index.php?s=Hc690

Excellent! Thanks! My most common "off square" hole is 1 7/8" to insert a 1 1/2" pipe nipple.

Steve S

Nipple:o

I see you had to comment on "nipple"...

I suppose 1 1/2" pipe hit too close to home to joke about?



Steve S

Its not the size of the boat, its the motion of the ocean.

I'll admit that mine's 2" , but not everyone's that round.


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weldin mike 27 wrote:Nipple:o

You snickered at nipple but missed the lots of lube quote.

They go hand in hand (pun intended)

Amateur mistake. Consider that a :o double snicker.

weldin mike 27 wrote:Its not the size of the boat, its the motion of the ocean.

Maybe, but's hard to get to Hawaii in a rowboat...