How to draw a drill bit

[Lim Guang Jian]

Dear members,
I am using autoCAD 2005. I just join a company that does wood cutting tools.Few days ago my boss just asked me to draw out a drill bit but I can't draw it out .I need somebody to give me an idea on how to draw a drill bit.Any measurement is not a problem.I just need an idea on how it is done.I attached these drawings for clearer idea for you guys.

[AMANDALEE]

Lim ...i tried the Helix script available from the forum here, drew a rod first then extruded a cirle along a helix. A little solids subtraction gave me a simple drill shape. It took only a minute, im sure with correct measurements and profiles it would do the job for you.........Amanda..

[AMANDALEE]

[Lim Guang Jian]

Hi friend, i was able to extrude the a circle along the spline but the circle needs to be rotate first. But after that, no matter what angle you rotate it, it would turn to 90' by itself. This cause the helix to have both ends 90'. And when I subtract the helix from the cylinder, the cylinder would have a curve as in this dwg. So I need a friend to figure out how to change that. I actually want it to have a complete curve from top to bottom without that straight wall. Thanks.

[AMANDALEE]

Hi.......heres a couple of screen shots..
I extruded a cylinder
Created a helix seperately, longer than i needed.
Added a tube to extend the lower end out of the helix.
Extruded a circle along the helix.
Unioned the 2 together.
Copied the helix assembly to the cylinder with the extra past the top.
Subtracted next, then copy/rotate/subtract for the opposite side.
Made a block to shape the facets on the sharp end.
Its not dimensional but the shape is pretty close from memory, im not an engineer but was a Carpenter for many years so know what a drill bit looks like.
regards...Amanda....

[Lim Guang Jian]

thx amanda,
u said to created a helix seperately and longer, but how do i do that because i only know how draw it using the points on the top base and bottom base of the cylinder (using quadrant point). how do i add a tube? is it using a circle and extrude it using spline as the path?
u too have a great weekend. thx too for sending those shots.

[Mr T]

Solid to solid with UNION command.