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  • Results 1 to 19 of 19

    Thread: RDF drum motor - Best for cost

    1. #1
      BWG is online now Senior Member
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      RDF drum motor - Best for cost

      I am looking at this motor for a possible DIY RDF build. It will be direct coupled thru a torque limiter self aligning coupling. What do you think of the torque ratings and speed? Cost?
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    2. #2
      kimini is offline Senior Member
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      You haven't given enough information to get good answers. Size of the drum? Weight of waste that it potentially has to lift? Resistance to rotation? About all that can be said is that it "might" work.

    3. #3
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      i can tell you that my drum is 24" long 18" diameter and is made from plastic and weighs about 25lbs. the motor i used has 20 ft.ld or rotational force at 9 rpm. i have had the drum completely full of water and no water in the clean area this will require the most amount of torque and the most stress. my motor had no issues turning the drum for a cleaning cycle.



      kwick
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    4. #4
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      After looking at some of the commercial drum sizes thinking about 16" Dia X 18". Plastic and will try to keep light weight.

    5. #5
      coolwon is offline Senior Member
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      Try looking at a barbeque or braai spit motors. Direct drive +- 4 RPM, capable of turning over a lamb carcass.

      I see ebay US +- $ 90.00 My China

      Garfield
      Last edited by coolwon; 04-16-2018 at 04:45 PM.
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    6. #6
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      something i forgot to add. i would look at a low voltage motor and not a high voltage motor. even though it is highly unlikely there is a chance that is the motor was to short out it could transfer voltage to the pond.

      i would think its like 1 in a trillion chance but it could happen.



      kwick
      Three may keep a secret, if two of them are dead. - Benjamin Franklin.

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    7. #7
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      Insulated type drive coupling?

      Earth leakage protection.

      Garfield
      Last edited by coolwon; 04-16-2018 at 04:43 PM.
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    8. #8
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      Quote Originally Posted by coolwon View Post
      Insulated type drive coupling?

      Earth leakage protection.

      Garfield
      this is a very viable option.
      i have done some searching but i know i only touched in a small amount of whats out there. but that being said this is what i can say.

      most of the motor couplings i have see and would use are solid stainless steel. i have seen some that are flex spiral cut stainless. i really dont think this type will hold up under the torque demands a drum filter will apply to them. i have also found rubber isolated couplings but they were made of steel or aluminum. both of these are out for me because in the long run they will rust or oxidize and become more trouble then they are worth.



      kwick
      Three may keep a secret, if two of them are dead. - Benjamin Franklin.

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    9. #9
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      That's a really nice and strong motor. I am using a motor rated at 24 ft lbs of torque and 9 rpm, and it turns my 15" x 12" plastic drum with ease. I also chose a 12v motor because I also did not like having 120v that close to water.

    10. #10
      coolwon is offline Senior Member
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      What is the ideal rotation speed a drum should rotate at?

      Not to waste water, but at the same time dislodge the dirt build up and flush it away cleanly.

      Garfield
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    11. #11
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      That's really hard to say, but I've always tried to stay in the 6-9 rpm range. Looks like the BE rotates even slower than that and it seems to work fine. I also find that rotating at least 360 degrees keeps the screen cleaner.

    12. #12
      coolwon is offline Senior Member
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      You have to reach a balance of dislodging the muck effectively but at the same time, not wasting water.

      Garfield
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    13. #13
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      i rotate mine at 5-6 rpm and 1.25 rotations. this give the optimal use of the drum. as far as the waste of water it all depends on the amount of nozzles, gallons per minute and psi being used. this will also determine how fast, slow and the amount of rotation.



      kwick
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    14. #14
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      Are you looking at something like this- or is this not enough oomph...

      https://www.ebay.com/itm/SALE-0-6-12...-/112528325965

    15. #15
      coolwon is offline Senior Member
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      Low profile

      Correct rpm to match

      Sensible mounting arrangement

      Shaft you can do something with easily

      Low voltage

      Capacity and durability probable shy?

      Your comments, please.

      Garfield
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    16. #16
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      I think it is too weak of a motor, and it would not last long even if it could turn the drum. My first motor was also a cheap Chinese made motor ($30 USD) rated at 48 kg cm, and self destructed after 6 months. It could not handle the weight of the drum and started to make clicking sounds, and eventually ground down all the gears in the gear box. My current motor is also Chinese made but much stronger...almost 3 times stronger. It has been operation since September of last year.

      The rated torque is 128 kg cm (9.26 ft lb) and stall torque is 332 kg cm (24 ft lb).

      https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
      Last edited by Huysy; 04-17-2018 at 09:30 PM.

    17. #17
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      Quote Originally Posted by Huysy View Post
      I think it is too weak of a motor, and it would not last long even if it could turn the drum. My first motor was also a cheap Chinese made motor ($30 USD) rated at 48 kg cm, and self destructed after 6 months. It could not handle the weight of the drum and started to make clicking sounds, and eventually ground down all the gears in the gear box. My current motor is also Chinese made but much stronger...almost 3 times stronger. It has been operation since September of last year.

      The rated torque is 128 kg cm (9.26 ft lb) and stall torque is 332 kg cm (24 ft lb).

      https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
      Do you also use the PWM controller/what speed do you control it to?

    18. #18
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      I do not use a speed controller...didn't need to. 9 rpm unloaded, and 7 rpm at rated torque.

    19. #19
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      I ran across this motor: https://rotisseriebbqs.ca/products/r...bbq-pig-motor/ It's 110v. They claim they rotate a 200 lb pig with it. I emailed and asked them about the current draw and torque, and got the reply that it draws 50watts and the torque is 200 kgf cm. I wanted to know what that means in ft. lbs. so I could compare it to this 12v motor: https://makermotor.com/pn00113-6-6-r...c-high-torque/ which claims 15.5 Ft. lbs of torque. I found this converter: https://www.translatorscafe.com/unit...-force%20foot/ Which told me that 200 kgf cm = 14.47 ft. lbs. So these two rotisserie motors have similar torque. They are similar in price also, although a DC power supply would be needed for the 12v motor. Sounds like they would have enough torque to handle a decent size RDF for a reasonable price.

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