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Motors

donkey

Feb 26, 2011
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so anyway I am starting to make stuff, cos that's what I do.... that and swear often, but I think I got the latter covered.

Anyway so I need expertise on this, am looking at making a lathe, I see most of them are around 2000rpm SOOOOOOO my question is does anyone know a motor that could handle a length of material about 1metre long at this speed, preferably 12volt so I can make it without having to deal with issues of mains.
I am looking at using a powersupply and a foot pedal to PWM the speed. got my own design so expect me to be using my second vocation regularly throughout the build.......
the motor needs to get about 2000RPM have some decent torque to stop some stalls. I have 99% of the parts except the motor. trying to find something under $100
 

duke37

Jan 9, 2011
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Go down to your local scrap yard and get a car dynamo (not alternator) which will make a powerful motor. Speed can be controlled by pulse width modulation and field weakening.
The dynamo should be OK to run up to 10,000 rpm without flying apart.

I have used a permanent magnet DC motor from a lorry fan to drive a coil winder but I now use a smaller motor because it weighs less.
 

Minder

Apr 24, 2015
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The problem with 12v is the current required to achieve the torque for a lathe spindle of a decent size.
The favorites are T.M. motors.
But 90vdc.
M.
 

Doug3004

Sep 5, 2014
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so anyway I am starting to make stuff, cos that's what I do.... that and swear often, but I think I got the latter covered.

Anyway so I need expertise on this, am looking at making a lathe,..
1) I guess this is a wood lathe? 2000 RPMs is really too fast for a (manually-operated) metal lathe IMO... You also might want to look at store-bought lathes and see how many watts their motors are, and then figure what motor to buy off that.

2) the easiest way to obtain a fairly-big, variable-speed motor is to buy a generic electric bicycle motor kit. There is brushed motors (smaller and cheaper, ~250W) or brushless (more cost and usually bigger, 400w+)

3) the 12v requirement is ,,, somewhat impractical. Unless you require the ability to run this thing off car batteries. (But the bicycle motor could be run off batteries too, of course...)

4) "dealing with mains" isn't a big deal really. You just go buy a Chinese CNC-style DC power supply that is at least 25% - 50% greater wattage than your motor needs. Bicycle motors tend to be either 24v, 36v or 48v, and it's easy to get big-enough power supplies in any of those values.
 

donkey

Feb 26, 2011
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ok so I seem to be finding some reasonably priced motors but they are all requiring huge power supplies, some at over 1kw and costing about $500..... so that kinda kills the idea here,
how about http://www.ebay.com.au/itm/ZY1020-E...AU-/252261652701?_trksid=p2141725.m3641.l6368 as the motor and then something like http://www.ebay.com.au/itm/New-20-A...CE-/172446586786?_trksid=p2141725.m3641.l6368 as the powersupply and http://www.ebay.com.au/itm/like/262136734012?lpid=107&chn=ps as the speed controller?
the idea is to get a home made lathe happening so I don't want to spend 1000s just on parts
 

Alec_t

Jul 7, 2015
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..... or if you want to shed a few calories after over-indulging at Christmas, how about making a pole lathe ? :D
 

Minder

Apr 24, 2015
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the idea is to get a home made lathe happening so I don't want to spend 1000s just on parts
I got a 2.5HP T.M. motor for $100.00 and a controller for $60.
There are either the MC-60 etc or the KB line for control on ebay.
M.
 
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