Dewalt 788

[rdlayton]

Looking for any help someone can give me on my Dewalt 788.  My variable speed control does not work. At first it ran at full speed. When I asked on another scroll sawing forum, what the problem could be, the answer was I had a bad circuit board. Replaced that at a cost of $55.00. Now the saw runs at the slowest speed. Still no variable speed.  Not sure what else to try. I want my Delta back but it's so old I can't get parts anymore. Now that was a great saw! Help and thanks

[DWSudekum]

How old is your saw?

DW

[rdlayton]

The saw is about four years old but it was in storage for the last two years.  It has had very little use. 

[WynnD]

I'm certain you have checked but is the knob firmly attached to the shaft? There is a screw that attaches the knob to the shaft. If it is loose the knob will turn but the control will not move.

[rdlayton]

You know I haven't checked that. I have turned the knob countlessly times when trying to get this thing to operate but never looked closely to see if the shaft is turning. I will check that when I get home from work. Thank you (I was looking for a much bigger problem)

[rdlayton]

WynnD  Checked on the speed knob. My does not have a set screw on it.  I went ahead and checked to see if it was turning and everything is working fine.  I guess the knob could be bad but it seems unlikely. Back to square one but thank you for the suggestion

[WynnD]

O.K. try putting a screw driver or knife blade under the knob and gently pry it up. You should b able to turn the shaft easily with your fingers. Maybe the inside of the knob has been rounded off, The shaft has a flat that the knob should turn by friction.