gear design

[Pierpat]

Good morning, meet me. I am a young designer of foundry equipment (models, anime molds, etc.) with a 2-year experience in the role. I was asked by a friend to draw a gear (of which I attach photos) of what I think is a drill or something.
not having experience on this type of mechanical components, my difficulty is to properly dimensional the teeth of the gear having at disposal are a caliber and failing to find a reference norm for the standard size.
I hope someone can give me a tip. thank you in advance to those who will have the time to answer.

 

[meccanicamg]

yours is an internal gear and also small densions. I would say with the caliber it is impossible to understand what it is. above all you have to understand whether it is a gear or a groove and what it does.
the solutions are two:
- ask for replacement to the manufacturer
- send the piece to a specialized gear company and let it detect and make it sample
think banally if there is profile shift and head cutter.... .you can't measure with the caliber to determine the module.

 

[meccanicamg]

If you only need to draw it for other reasons that are not the spare price, I recommend using khk gear which is a Japanese site of a manufacturer and after free registration it also has the computer online.
always on the site you will find all the explanations for the table gears 4.6 e 4.7.Surely you have to count the teeth, take the internal measure (spera be equal to the teeth otherwise you have to use the formula) and if you are good with two calibrated spines determine the primitive diameter (there are formulas always on the site...but on such small dimensions I see it hard). Moreover, you must also measure the entire operation and at this point also the pinion... so bad that it goes you both do it again with certainty of ingration.

 

[Pierpat]

thanks for the mechanical responsemg! the piece is an internal gear that goes to couple with a group of 3 solar and one from 4.. I will make a ride on khk gear, thanks for the straight.. I also agree that the solution would be to draw the whole group or send the component to a specialized company (there are no spare parts).

 

[Pier]

from photos I think they are particular of an epicloidal gearbox I recommend to look for the model and buy spare parts