Spur gear selection for parallel shafts

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To attach a 12-tooth pinion to a 4mm diameter flat tip DC motor shaft, a common method is to use a gear with a hub and a set screw. The set screw can secure the gear to the flat section of the shaft, ensuring proper alignment and stability. There are concerns about finding stainless steel gears specifically designed for flat tip shafts, as many available options may not fit this requirement. Some gears are designed with an opposite shape to accommodate flat shafts, which could be a viable solution. Proper gear selection is essential for effective power transmission in parallel shaft applications.
novato
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Hi,

I have a DC motor with 4mm diameter shaft, flat tip.

How can I attach a 12 teeth pinion to this drive shaft?. I have been loking for pinions and gears on the web but they don't specify how are they attached to a shaft, as there are round shafts and flat tip shafts. Do I have to ask for gears with hub and set screw?

Any help would be very appreciated.

Novato
 
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There are many ways to do it, one of the simplest would be a set screw in the gear's hub, like on this W.M.Berg gear:

http://www.wmberg.com/catalog/photos/B05B065.jpg
http://www.wmberg.com/catalog/productsearch.aspx?url=http://wmberg.smartcats.com/sc_app/default.asp
 
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The set screw is a good option but, is there any stainless steel gear that matches a flat tip shaft like this?
 

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Your question doesn't make a whole lot of sense. The flat is made for the set screw. Who/what are stanley steel gears?
 
FredGarvin said:
Your question doesn't make a whole lot of sense. The flat is made for the set screw. Who/what are stanley steel gears?
Thank you. I have seen some gears that have an opposite shape for flat tip shafts.
PD: I'm sorry about the bad spelling.
 
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