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Author Topic: Material for Gear wheels  (Read 1779 times)
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puta
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« on: September 05, 2011, 12:55:21 00:55 »


I am looking to machine few gear wheels for my prototype.

I need to figure out the materials to use for the gears with a better torque, strong enough for the geat teeth etc.
I searched, and came up with materials, starting with nylon, ABS plastic,  PTFE, tefloan etc (they come in rods)

I have access to small milling/lathe machine, and need to machine gear wheels for motor shafts and some other gear wheels.

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babatundeawe
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« Reply #1 on: September 05, 2011, 02:28:20 02:28 »

like what you need is not well stated, do u need to know how to cut the gears or you want sugestion as per which material to use
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puta
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« Reply #2 on: September 05, 2011, 04:00:55 04:00 »

Thanks Babatundeawe,

Yes, I first need to select which material to use. ABS plastic or PTFE rods can be bought over on e-bay. Are they strong enough for the torque transfer over gear teeth?? And are they those material machinable using small milling/lathe machine?

I have not done it before, and suggestions would greatly help me.

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Ichan
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« Reply #3 on: September 06, 2011, 02:07:36 14:07 »

Try Delrin, it is like nylon with better machine ability.

-ichan
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solutions
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« Reply #4 on: September 07, 2011, 12:37:55 00:37 »

You need to tell us the torque, the speed, the availability of lubricants, the type of load (cyclical, steady, accelerating, impact), shaft sizing, etc before your question can be properly answered.

I think you have better things to do than to cut gears, which is a very complex machining operation (a lathe is next to useless for cutting gearteeth) if you don't have the right tools (also, if you are thinking of machining teflon...good luck with that). 

Buy stock gears (SDP-SI is a source), or rescue some from salvaged printers etc, and call it a day.
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puta
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« Reply #5 on: September 07, 2011, 03:33:03 03:33 »

My requirement is to push some loads of the range 2- 5 Kgs using NEMA 23 motors. Load drive to some presition steps and need acceleration. I need to develop a little gear-box to couple the load to the motor, so decided to machine some wheels to do it.

Good idea to use the wheels recover from slavage, but still need to make some wheels, as it may be difficult to find the matching intermediate wheels.
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Parmin
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« Reply #6 on: September 08, 2011, 06:17:42 06:17 »

How fast do you want to push the 2 - 5 kg item?
What acceleration profile?
remember Force = mass x acceleration, so the higher the acceleration, the stronger you need your material to be.

IMHO, stop being secretive and describe exactly the function of the machine so we could help.

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puta
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« Reply #7 on: September 10, 2011, 07:27:51 07:27 »


Found this handy table to compare some properties of plastic materials,
and it helps understanding of some of these materials.

http://www.machinist-materials.com/comparison_table_for_plastics.htm

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DonRecardo
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« Reply #8 on: September 13, 2011, 04:59:07 16:59 »

If you buy a set of involute cutters to mill your gears they will cost as much
if not a lot more than buying professionally made gears .
Gear cutting is not a job for a beginner

Don
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mick the mend
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« Reply #9 on: September 13, 2011, 09:48:36 21:48 »

Could not agree more. I have used a supplier that has been very helpfull over the years. If they don't have what you need I would be very surprised.

http://www.hpcgears.com/

Hope this helps 
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