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 Post subject: Which motor?
PostPosted: Tue Sep 05, 2017 9:04 pm 
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Hi there,

I was wondering if anyone might be able to tell me what size motor i would need to spin a 2x2m piece of 20mm mdf at 1000rpm on a horizontal plane? it would be useful if it was a variable motor too!

Hope this makes sense!

Thank you!

Nick


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 Post subject: Re: Which motor?
PostPosted: Tue Sep 05, 2017 9:50 pm 
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An old vacuum cleaner or washing machine motor should be able to do that. The latter are usually speed controllable.

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 Post subject: Re: Which motor?
PostPosted: Wed Sep 06, 2017 8:35 am 
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The air resistance will limit the speed to power and we really have no idea of the air resistance, even a 20W fan motor could in fullness of time get it to spin at that speed, however I would likely be looking as something a lot bigger, with a brushed motor you could consider direct drive, but with squirrel cage they tend to be linked to frequency of the supply so 740 rpm is common and so is 1480 rpm so it would need a belt drive to increase or lower the speed, using an inverter you can set the motor speed but they are expensive, and using something like a brushed vacuum cleaner motor the speed could go daft. I would be worried at a 1000 rpm if the wood can take that speed safely. It may break up at that speed depending who made it, the strength of MDF varies a lot when made from recycled wood it is normally stronger, but even humidity can alter its strength.


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 Post subject: Re: Which motor?
PostPosted: Wed Sep 06, 2017 9:07 am 
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far to many variables really 2m 20mm will flex like mad so need support in at least one mid point as well as each end
a strait broom handle may be better
are you trying to "turn" somthing as in on a lathe or what ??
the answer given is pointless without knowing all the requirement :dunno:

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 Post subject: Re: Which motor?
PostPosted: Wed Sep 06, 2017 11:10 am 
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big-all wrote:
far to many variables really 2m 20mm will flex like mad so need support in at least one mid point as well as each end
a strait broom handle may be better
are you trying to "turn" somthing as in on a lathe or what ??
the answer given is pointless without knowing all the requirement :dunno:


I read the question as a 2.0m square of 20mm mdf. :dunno:

(I know nothing about motor capabilities).

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 Post subject: Re: Which motor?
PostPosted: Wed Sep 06, 2017 11:28 am 
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My thoughts would be along the line of ericmark's.
AS far as power goes the bigger the better, just from a driving it POV. Any motor used will have to have enough torque to overcome the initial inertia when starting.
But a 2m square of anything turning at 1000 rpm is going to be dangerous to anyone coming in contact with it, so will need proper guarding. Also as already said, if it's just mdf, it's going to be in danger of breaking up I'd have thought.
At 1000 rpm I'd have thought you'd be hitting balance problems.


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 Post subject: Re: Which motor?
PostPosted: Wed Sep 06, 2017 11:49 am 
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The only thing I can think of is for a Carnival float. I think the "rotatey" bits on those are normally driven by shafts from gears, linked with belts/chains etc . with one BIG motor.

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 Post subject: Re: Which motor?
PostPosted: Wed Sep 06, 2017 11:51 am 
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ayjay wrote:
big-all wrote:
far to many variables really 2m 20mm will flex like mad so need support in at least one mid point as well as each end
a strait broom handle may be better
are you trying to "turn" somthing as in on a lathe or what ??
the answer given is pointless without knowing all the requirement :dunno:


I read the question as a 2.0m square of 20mm mdf. :dunno:

(I know nothing about motor capabilities).

if thats the case its about 60kg in weight and with a join as sheets are 4 or 5ft wide :dunno:

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 Post subject: Re: Which motor?
PostPosted: Wed Sep 06, 2017 12:08 pm 
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big-all wrote:
ayjay wrote:
big-all wrote:
far to many variables really 2m 20mm will flex like mad so need support in at least one mid point as well as each end
a strait broom handle may be better
are you trying to "turn" somthing as in on a lathe or what ??
the answer given is pointless without knowing all the requirement :dunno:


I read the question as a 2.0m square of 20mm mdf. :dunno:

(I know nothing about motor capabilities).

if thats the case its about 60kg in weight and with a join as sheets are 4 or 5ft wide :dunno:


It all adds up to it being a non starter IMHO.

Sorry OP, I know it's easy to be negative, but I really do feel that you need to rethink this.


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 Post subject: Re: Which motor?
PostPosted: Wed Sep 06, 2017 1:13 pm 
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Spinning it isn't a problem. Properly balanced you could do it with a toy motor. It's getting it STARTED spinning that will be the big issue thereafter consideration for the 'load' on it (anything that will try to slow/stop it, including wind resistance etc).

But you need also to consider the speed of rotation too. How many rpm are you looking at? You could even make a basic large toothed wheel out of MDF on the under side and a corresponding drive gear on whatever motor you use. The gear ratio will determine the size of motor required - as well as the rotational speed.

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 Post subject: Re: Which motor?
PostPosted: Wed Sep 06, 2017 5:54 pm 
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I wouldnt want to be in the same room as a sheet of mdf is spinning at 1000rpm :?


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