another special angle drill bit

Apr 14, 2005 2 Replies
C

I am making a carburator for a model engine. The throat of the carb is 3/16.



The bottom of the throat (below the throttle plate) needs to be enlarged with a 1/4 inch drill with a 45 degree angle.



I figure I will drill most of the way with a standard drill bit to enlarge the 3/16 hole to 1/4. Can I use a spade bit with a 45 degree angle to finish it off and establish the angle? Would it be better to grind a twist drill into a 45 degree angle?



thanks chuck


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D

When you say 45 deg, is that half the angle (i.e., it the total included angle 90 deg)? If so, you can buy "spotting drills" with a 90 deg point angle.

- Michael

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C

You know, I'm not sure. The plans just say 45 deg angle, but I think that really means a 90 deg point. Good suggestion!

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