1. teeth of spur gear

Thanks for the reply ,I'm still waiting for someone to give me pointers how to make just a teeth of the gear with all the values( such as pitch dia,base circle etc.) I 'll study your helical gear once again thankyou!!!

2. Re: teeth of spur gear

How i done this at college is to draw a circle to your required diameter of the gear and at the top of the circle draw just one tooth. If you zoom into the top of the circle and draw one tooth with all the required dimensions etc...

Now using the POLAR ARRAY command enter the amount of teeth required and array with the centre point of the circle. You can also set the required distance between each tooth.

3. teeth of a spur gear

Hi Craigp, I need to draw a teeth of a spur gear alone I just want to learn to get the exact way to draw a teeth. I know how to array it.Thanks for replied.

4. Re: teeth of a spur gear

Sorry i did not understand correctly last time - Do you have an image of what you are wanting to achieve? If so post it on and it will give people a good idea of what you are asking for

5. teeth of a spur gear

Sorry I don't have a picture of it , just one teeth how you can draw it with all dimensions.

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I's kinda involved.
What you have to have:
number of teeth
pitch diameter
major & minor diameters of spline
pressure angle
top and base fillets of tooth
If external teeth:
tooth width
If internal teeth:
space width

Place the following objects on different layers with different colors so it won't be quite so confusing.
1. draw pitch diameter
2. draw major & minor diameters concentric to pitch diameter
3. draw verticle line from major od north quadrant, toward center
an inch or so past minor od (length not important)
4. offset the verticle line 1/2 the space width if internally splined
or tooth thickness if externally splined.
5. draw a horzontal line from north quadrant of pitch diameter to the
right, 3 or four inches (length not important)
6. rotate/copy this line from quadrant, clock wise, the value of
pressure angle.
7. create base diameter by drawing circle from center to
perpendicular of lower leg of line you copy/rotated.
8. if bottom leg of copy/rotated line is not long enough to reach the
base diameter, then extend line to the base diameter circle.
9. draw a radius circle, center point at intersection of base circle and
lower leg to the intersection of the verticle line and pitch
diameter.
10. trim this circle using the major and minor diameters of spline
keeping the portion that falls between these 2 diameters.
this is one side of the tooth.
11. fillet this arc at both ends.
12. mirror this arc w/fillets using the end points of the first verticle
line.
13. trim out what you don't need.
14. you now have a tooth with a partial circle still attached to the
fillets.
15. array the tooth around the pitch diameter.
16. trim the partial circle that's still attached to the fillets on one
tooth only.
17. erase remainder of partial circle.
18. array the trimed out portion of the circle the same number of
times as teeth.
19. pe edit join all entities.
20. done!!!

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