I am surprised the Triac control does not work, this is used for power tools etc with the same type of motor.
If you are a little ambitious you could try a 20amp bridge rectifier on the motor output of the unit you have and feed the motor DC, only a couple of $ to lose.
See if DC on the motor is a little better!
Max.

 

Lauren, this is the same from China for £1.39, 230V @25Amp, be advised China are on New year Holidays until February...

http://m.ebay.co.uk/itm/2000W-AC-50...%3Aebdfa3281590a548a1bd7991ffb0439f%7Ciid%3A4

 

I am surprised the Triac control does not work, this is used for power tools etc with the same type of motor.
If you are a little ambitious you could try a 20amp bridge rectifier on the motor output of the unit you have and feed the motor DC, only a couple of $ to lose.
See if DC on the motor is a little better!
Max.

it works max , i was wrong before and i got it working , but it only reduced the rpm slightly, id say i'm dropping from 11,500 to about 9,000rpm

i'm wondering how i can drop this further to like 400rpm...theres a blue tacho on the controller like in that youtube video, but i dont know whether or not to turn the screw and adjust it or is that a bad idea ?

 

That could be a preset rpm setting, try turning it keeping track of how many turns you moved it, it is a multi-turn pot, 10 or 20 etc.
There is nothing to lose in trying it.
Max.

 

ok im off to try it was scared id put timings out n blow it lol

 

ok im off to try it was scared id put timings out n blow it lol

Live dangerously!
Max.

 

woo max i turned it 10 times 1 way, was fast, so i did 20 timesotherway.....now id say im controlling it from 4000rpm ---11500rpm


its perfect !! thankyou!!! and sorry for making you think you was going crazy in the begining lol

 

Pas de problème .
Max.