describing diameter of circle by tooth pitch
describing diameter of circle by tooth pitch
(OP)
Hi all
I need some help if i might ask
I need to Model a chainwheel and drive its diameter by the pitch of
each tooth.
the pitch is 12.5 mm or 0.492" for our american buddies
what i need to do is describe diameter as a result of the tooth pitch
x the number of teeth
im puzzled this is probably really easy to some of you guys i can only
describe the diameter of the circle using dimensions and not the
circumference
any help
I need some help if i might ask
I need to Model a chainwheel and drive its diameter by the pitch of
each tooth.
the pitch is 12.5 mm or 0.492" for our american buddies
what i need to do is describe diameter as a result of the tooth pitch
x the number of teeth
im puzzled this is probably really easy to some of you guys i can only
describe the diameter of the circle using dimensions and not the
circumference
any help






RE: describing diameter of circle by tooth pitch
I have done something very similar with gears. The best solution is to use a design table. You can place the design table on your drawing, and use it to display undimensional values such as diametral pitch.
To add non-dimensional data to a design table, type in headings such as $PRP@DP and $PRP@TEETH. Plug your diametral pitch value and number of teeth underneath these and use the values to calculate your pitch diameter. All of this is easily displayed on your drawing.
Obviously, I am thinking English spur gears here, but you can easily plug in the appropriate values for chain sprockets.
JHG
RE: describing diameter of circle by tooth pitch
diameter = pitch * (# of teeth / 4 - 0.5)
RE: describing diameter of circle by tooth pitch
can you explain arlin just so i understand properly
/4-0.5 what do these values represent
RE: describing diameter of circle by tooth pitch
dia = 2*pitch*sin((90-180/#_of_teeth)*pi/180)/sin(360/#_of_teeth*pi/180)
RE: describing diameter of circle by tooth pitch
RE: describing diameter of circle by tooth pitch
Copy the follwoing into the SWX equation editor (Tools/Equations/Add).
diameter=2*pitch*SIN((90-180/#_of_teeth)*ATN(1)/45)/SIN(360/#_of_teeth*ATN(1)/45)
Now replace diameter in the equation with your diameter dimension name.
Replace pitch with your pitch dimension name.
Replace #_of_teeth with your pattern number dimension name.
Now it should work!
RE: describing diameter of circle by tooth pitch
thanks mike
RE: describing diameter of circle by tooth pitch
diameter = p/sin(180°/n)
http://www.EsoxRepublic.com
RE: describing diameter of circle by tooth pitch
Also, I included the conversion from deg to rad in my equation, which is required in SWX.
So, the final equation for SWX becomes:
diameter = p/sin(4*atn(1)/n)
where p is pitch and is number of teeth
MUCH SIMPLER!!!!
RE: describing diameter of circle by tooth pitch
diameter = p/sin(pi/n)
http://www.EsoxRepublic.com
RE: describing diameter of circle by tooth pitch