Mike on sat 4 jan 03
I was asked to look at a Brent Model C wheel with speed problems. This wheel
is in a studio with several wheels.
It would not stop with the foot pedal all the way depressed. There are
adjustment screws on the bottom of the foot pedal. The newer wheels have a
hole in the bottom to adjust this. This is an older wheel (ten years) and
does not the have the hole, so I needed to remove the bottom.
*** Now a word of caution, there is live voltage in the foot switch,
removing the plastic cover will expose you to that voltage and I am not
recommending that you do this***
There are actually two adjustment, one high speed and one low speed. If the
low speed pot was adjusted to stop the wheel then you could only get about
half speed at top end. If you then adjusted the high speed, the wheel would
not stop.
The other thing is was doing, and this was a little "spooky", when the foot
switch on the wheel next to it was turned on, this wheel would start turning
with its foot switch off.
After fooling with the foot switch and testing the resistors I used the
"remove and replace with known good component" troubleshooting method. It is
an advantage having another proporly working wheel. After swapping out foot
switches, did not clear the problem, it narrowed it to the speed controller.
Which I had already suspected because of the phantom turning problem.
I originally searched the archives and found this to be a common problem,
but all the replies gave advice on how to adjust the foot switch, if this
does not work it may well be the circuit board in the controller.
Mike
John Rodgers on sat 4 jan 03
I suggest that anyone having this problem described here Contact AMACO
about it. As short a time as 5 years ago, the manufacturer was putting
out a free upgrade kit to resolve just such problems. My Brent CXC had
the problem and the new electronics solve the difficulty.
John Rodgers
Birmingham, AL
Mike wrote:
>I was asked to look at a Brent Model C wheel with speed problems. This wheel
>is in a studio with several wheels.
>
>It would not stop with the foot pedal all the way depressed. There are
>adjustment screws on the bottom of the foot pedal. The newer wheels have a
>hole in the bottom to adjust this. This is an older wheel (ten years) and
>does not the have the hole, so I needed to remove the bottom.
>
>*** Now a word of caution, there is live voltage in the foot switch,
>removing the plastic cover will expose you to that voltage and I am not
>recommending that you do this***
>
> There are actually two adjustment, one high speed and one low speed. If the
>low speed pot was adjusted to stop the wheel then you could only get about
>half speed at top end. If you then adjusted the high speed, the wheel would
>not stop.
>
>The other thing is was doing, and this was a little "spooky", when the foot
>switch on the wheel next to it was turned on, this wheel would start turning
>with its foot switch off.
>
>After fooling with the foot switch and testing the resistors I used the
>"remove and replace with known good component" troubleshooting method. It is
>an advantage having another proporly working wheel. After swapping out foot
>switches, did not clear the problem, it narrowed it to the speed controller.
>Which I had already suspected because of the phantom turning problem.
>
>I originally searched the archives and found this to be a common problem,
>but all the replies gave advice on how to adjust the foot switch, if this
>does not work it may well be the circuit board in the controller.
>
>Mike
>
>______________________________________________________________________________
>Send postings to clayart@lsv.ceramics.org
>
>You may look at the archives for the list or change your subscription
>settings from http://www.ceramics.org/clayart/
>
>Moderator of the list is Mel Jacobson who may be reached at melpots@pclink.com.
>
>
>
bea pix on tue 7 jan 03
mike,
i used the hole in the plastic panel at the bottom of the foot pedal
and voila! all is well.
(i called amaco/brent and the guy gave me detailed directions--i am
truly dumb with this stuff). whew. i thought it would be more of a
big deal. thanks for all your help!
bernice
| |
|
