Broken J drill Bits

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avbill

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Joined
Oct 18, 2007
Messages
1,973
Location
San Bruno, CA, USA.
I have always used my drill press for drill holes in the blanks Never had a problem until now! I bought a stylus which has a 5" 7mm tube. I put it on the lathe to drill b/c my throat of the drill press is 3.5"


First time I broke the blank . no problem.

Second time i broke the J drill bit.

I slowly drilled both.

Any suggestions?

Another question Is there a company that make a J drill bit with 5-6 flutes to it.

Any information will be helpful. I use the stylus as a give away then they purchase a 400 dollar from me. I ad value to the sale! and never get can i get a discount.
 
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JTisher

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Joined
Dec 15, 2013
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86
Location
Olmsted Falls, Ohio
I doubt they make a four flute J. Try a parabolic flute. As far as speed, I drill all my blanks at 1450 rpm, and I've never had a problem

Joe
 

designer

Member
Joined
Jan 23, 2011
Messages
380
Location
Washington, Michigan
Check your local machine shop tool house. It sounds like you have a standard jobbers drill. They make the same size drills in longer lengths. You can get them with flutes up to 12 inches in length. A 6" flute length will do fine for you and allow a lot of resharpening as well.

There are also online stores to buy tooling at that might be less expensive but you will have shipping and a delay in getting it. A local store might have one or be able to get it the same or next day.
 
Joined
Aug 6, 2013
Messages
836
Location
Jasper Indiana
What kind of blanks are you trying to drill? If you are drilling a non wood blank you might try a coolant/lubricant. Maybe some water with a little dish soap. Just make sure it is rinsed well and dry before you glue the tube in.

Mike
 
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