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# Shredder motor

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I´m looking for a suitable motor. The bill tells that it must be +/-2000w and +/-70rpm. But I have only found mínimum 1500rpm. Am I misunderstanding something?

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### In reply to: Shredder motor

starter
09/05/2016 at 18:55

Luis,

### In reply to: Shredder motor

helper
10/05/2016 at 00:35

Hi, there is some discussion on different motor types over here in the first few pages.

### In reply to: Shredder motor

starter
10/05/2016 at 13:45

Hola

Luis as I understand it is the output of the shaft after the gear reduction that is 70rpm.

So either use a motor with an apropriate gear reduction or a voltage regulator to control the rpm.

### In reply to: Shredder motor

warrior
10/05/2016 at 19:32

What @epos says! You can use that motor and try to reduce the speed using belts, chains, gearwheels or other mechanisms

### In reply to: Shredder motor

starter
11/05/2016 at 04:33

You’re going to see 1500 and 1800 a lot in motor speeds. The best way to get down to 70=ish rpm is motor gearing.

Where does 1500 and 1800 come from: You have either 50 hz or 60 hz AC electricity feeding your motor depending on your country. This powers electromagnets in the motor which pushes or pulls on the shaft to make it turn. There’s one “push” and one “pull” per cycle of voltage, and the most common motors have 4 poles (or electromagnets) built into them. So, if you have 60 hz x 60 seconds/minute x 2 (for one push and one pull) = 7200. 7200 / 4 poles = 1800 rpm.

### In reply to: Shredder motor

starter
11/05/2016 at 15:43

Thank you all! So, I understand that the motor must include the apropriate ruduction mechanism. Is this mechanism also shown on the blueprints?

### In reply to: Shredder motor

starter
11/05/2016 at 15:44

Or do I have to design it myself?

### In reply to: Shredder motor

starter
11/05/2016 at 15:45

@macias: I’m in Spain. Estoy en España.

### In reply to: Shredder motor

helper
11/05/2016 at 23:45

luis-depedro
starter
11/05/2016 AT 15:43 EDIT | MOVE | SPLIT | TRASH | SPAM |
Thank you all! So, I understand that the motor must include the apropriate ruduction mechanism. Is this mechanism also shown on the blueprints?

No there is not, would be good to have a design, that everone could make.

You can buy worm gearboxes of eBay, new & 2nd hand

### In reply to: Shredder motor

hero
13/05/2016 at 00:24

Just fyi, normally, the worm gearbox (Motor reductor) costs more than the motor itself. You will not find a motor with less than 1000rpm in the market, so you will need to buy a reductor, or buy a motor with the reductor preinstalled, or build your own reductor with pulley belts like this one:

### In reply to: Shredder motor

new
13/05/2016 at 04:15

I got a 25rpm motor bit i dont know if if its too much or do I need a bigger one?

### In reply to: Shredder motor

warrior
13/05/2016 at 10:21

@e21333 Does it have a power rating written on it (kW or HP)? Or the volts and amps?

### In reply to: Shredder motor

starter
16/05/2016 at 17:50

busca un motoreductor complete, consta del motor y caja de engranes, la caja de engranes es quien te dara las RPM requeridas.

dear luis,
look for a gear motor, it is the motor + the gear box, this gear box is the one that give you the RPM needed.
you can look on ebay for a gearbox motor

http://www.ebay.com/sch/i.html?_odkw=gear+motor+115&_osacat=0&_from=R40&_trksid=p2045573.m570.l1313.TR0.TRC0.H0.Xgear+motor+115+70rpm.TRS1&_nkw=gear+motor+115+70rpm&_sacat=0

### In reply to: Shredder motor

helper
17/05/2016 at 00:50

Makes it easy for everyone 🙂

### In reply to: Shredder motor

starter
17/05/2016 at 01:18

@enviro, edited 🙂

### In reply to: Shredder motor

helper
17/05/2016 at 01:48

Thank you for doing that, awesome 🙂

### In reply to: Shredder motor

starter
21/05/2016 at 13:06

OK, but I think that the shredder is going to cost quite more than the price on the bill.

### In reply to: Shredder motor

starter
06/11/2016 at 17:52

Luis,

For Spain you have 50Hz performance:
If motor is 1500rpm, get reducer Ratio: 20:1
If motor is 750rpm, get reducer Ratio: 10:1 (very rare, but possible and outlasts the 1500rpm motor)

In Europe you have easy access for italian reducers, they are cheap, good and plenty. Germans are good but generally more expensive.

If you can find factories (every factory has reducers for conveyor belts, machines, etc), try and get newspaper ads from recently closed factories that are liquidating their merchandise. Or try finding people that sell scrap metal containers (they often have these reducers with motor in the container). You can probably buy it for their weight in steel price.

Belts have problems, they get deteriorated and break on usage, you should always put a belt protector over the pulleys. Reducers just need proper maintenance and grease, greater Torque loads (effective power on shredding blades) and durability.

For used and found reducers, go Bonfiglioli, Motovario

Retail (new): TRANSTECNO (cheapest and lightest)

Hope this helps.

### In reply to: Shredder motor

helper
27/11/2017 at 10:42

Hey, Somebody know the engine couple we need to the output of the reductor? thank you

### In reply to: Shredder motor

starter
02/02/2018 at 10:53

Hello, is there anybody overthere that can tell me if this is a good motor to use for the shredder? can we fix the shredderblades (we’ve cut them already) on this one? thanks, feye

### In reply to: Shredder motor

new
02/02/2018 at 13:00

Alguien me deja un número de teléfono o mail para contactar , estoy interesado en empezar un proyecto
El mío es [email protected]
0034653968612
Thanks

### In reply to: Shredder motor

dedicated
03/08/2018 at 05:01

@citsalp
you can see the discution forum about good motor in here

### In reply to: Shredder motor

new
30/08/2018 at 01:25

Hi Guys, this might be dumb but I just built a Maslow CNC and I was thinking, the stepper motors are under serious load at high torque, could these be a low cost solution?

something like: https://www.ebay.com.au/itm/DC-24V-5500RPM-115RPM-8mmx14mm-Shaft-Electric-Power-Turbo-Worm-Geared-Motor/302287056936?epid=775029919&hash=item4661b67028:g:8ZkAAOSwb9dZvq87

### In reply to: Shredder motor

starter
27/05/2019 at 20:50

Hello everyone,
I was able to find 2.2KW motor (around 3 HP), and a gearbox connected to it which converts 1400 RPM to 97 RPM. I wasn’t able to find a gearbox that converts to 70 RPM. Would that be okay for the shredder? Or will it be too fast?
Please let me know if the motor power will be okay!

### In reply to: Shredder motor

helper
28/12/2019 at 20:16

For the small amount that the Shredder can spread at one time. I feel that the motors are overrated. Liking the idea of the mobile unit, has anyone tried a 12vDC high torque, low-speed motor?  like these shorturl.at/fDUV4

Much Cheaper and lighter 🙂

I have been looking at the idea of making the Shredder with Plastic,
components.

Thoughts
Cheers,
Craig

### In reply to: Shredder motor

helper
28/12/2019 at 20:59
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