Hello,
I have never sketched serrations before. I have some data that was provided on the print. The feature is to be cut into the OD of the part. Does anybody have a drawing of serrations or can show me what they should look like? I don't know what all the data below means.
Serration Data:
# of teeth: 99
pitch: 16/32
Nom Pressure angle: 45
Pin Diamter: .120
Number of pins: 2
Pin measurement: 6.3965 +/- .0005
Would this be a revolve cut around the center of my part?
Joesph,
Any way you could post the drawing so I can get a better idea of what it is for? Sounds to me like some sort of gear data.
Chris
I probably cannot post the print for confidentiality reasons.
I have created the serrations. After looking at the pitch between them something isn't right. I find the pitch to be 0.200'' instead of 16/32''. I used the circular pattern with 99 features. The pin measurement means the center of a pin of 0.120'' diameter coinsides with the 6.3965''. They never called out any root diameter so my serrations come to a point.
From everything I have ever seen the pin dimensions is the dimension over the outside of the pins.
Yes you are correct Christopher. I changed the drawing to reflect that. My pitch is still incorrect with 98Teeth.
I can't figure out why just yet. The pitch is just around 0.200'' from one.
See the updated serrations below
I thought there was supposed to be 99 serrations?
98 cuts would be 99T but the pitch 16/32 isnt' correct yet. I can't seem to generate the correct pitch with the given data.
any ideas?
The pitch has to be measured on the pitch diameter or it won't be correct (but it appears they didn't supply a pitch diameter for you).
The pin measurement is the OD measured if you put pins in 2 of the grooves on opposite sides (as if you measured with a set of calipers on the outside of those pins).
It sounds like circular saw blade specs. Serrations would be the material cut out to form the teeth.
# of teeth: 99 (Total number of teeth around the diameter.)
pitch: 16/32 (Point to point distance on the points of the teeth. Measured in 32nds so it's really 1/2")
Nom Pressure angle: 45 (I believe this is the angle relative to center on the cutting edge of each serration.)
Pin Diamter: .120
Number of pins: 2
Pin measurement: 6.3965 +/- .0005
(Not sure this could be some form of locking mechanism for the saw. I know some smaller grinding wheels have 2 holes or pins depending on manufacturer to lock it onto the axle to prevent it from spinning loose from the machine.)
I'd first extrude a disc with the OD and then use an extruded cut to make a single serration. After that I'd use circular feature pattern of 99 instances.