Another good source of VDG motors are from cheap oscillating fans. They are AC but often come with simple push button speed controls and have an advantage of being virtually silent. The torque is a little low so you cant overstrech the belt.
Personally i use AC high speed fixed motors with built in cooling fans i got from AX-man some time ago. I dont know what they came from but they are very powerful and allow for almost continuos discharges.
On a related note I had one of my large 5 foot machines setup in the living room and a friends dog decided it was a perfect urinating post. I didnt even notice and proceeded to demo the machine, only to spread the urine all over the mechanics ruining everything including expensive bearings.
It was a sad day.
----- Reply message -----
From: "doug" <doug11642@xxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Subject: [TCML] VDG pickups (was Ignition coil driver)
Date: Sat, Dec 26, 2015 9:43 AM
The best motors for small to medium size VDG's are, by far, those little
sewing machine motors, They have gobs of low end torque, are a brushed
motors, can be controlled with a single-pole light dimmer. and cheap. Most
sewing machine repair shops have used ones for $5 to $10.
Doug
From: Jim Lux
Sent: Thursday, December 24, 2015 5:28 PM
To: tesla@xxxxxxxxxx
Subject: Re: [TCML] VDG pickups (was Ignition coil driver)
On 12/24/15 5:56 AM, ExtremeElectronics.co.uk wrote:
> Stefan.
> Initially I decided to go with the traditional build. Id had my
> fill of electronics and wanted something different (I then built a uP
> speed control for the motor)
>
> So, hair dryer v High voltage supply.
>
> I've thought about it, but I'd need to change my bottom roller to
> Aluminum. I don't have the workshop tools to make another crowned
> roller. The last two rollers were machined for me, so it will have to
> wait until someone with a lathe owes me a favour..
>
You can wrap tape around the roller to make a crown. All it needs to be
is a bit bigger in the middle than on the sides.
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