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Jet 1442VS speed control

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Forum topic by kmetzger posted 05-08-2021 07:33 PM 255 views 0 times favorited 5 replies Add to Favorites Watch
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kmetzger

196 posts in 2933 days


05-08-2021 07:33 PM

I disassembled the speed selector recently to address a problem I was having with it slipping from a low speed to a higher speed while turning. Before removing the handle, which is held on with a set screw forced against the flat area, I set it to the lowest speed.
After reassembling it, the speed is very wrong. A tachometer test showed me that when the handle is set to 450 I was getting 1700 rpms.
I reattached the handle a few times and measured the rpms. This way, by dumb luck, because the flat area the handle attaches to will be in a different position each time I reattach it, I got the following readings: when set to 250, I get 550. When set to 450, I get 800. When set to 600, it’s 1,100 and set to 850, it’s 1,400.
it’s hard to believe that Jet hasn’t addressed how to reinstall a speed selector handle.

-- Kim, Ajijic, Mexico, http://tinyurl.com/7w5fm25


5 replies so far

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Madmark2

2835 posts in 1703 days


#1 posted 05-08-2021 07:50 PM

Turn it all the way down to slowest and align the indicator to the indicated tach rpm.

Also, is it possible the tach is seeing two flags? A 2x speed error seems pretty noticeable. Most tachs “see” a marker tag attached to a rotating surface. If there is something else reflective the sensor can be fooled into double counting and therefore reading off by 2x.

Inspect the shaft surface. There should be a clear indication of where the set screw was originally.

-- The hump with the stump and the pump!

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kmetzger

196 posts in 2933 days


#2 posted 05-08-2021 08:04 PM

Thank you. But I’m not sure what you mean by align the indicator. There’s a disk with the speeds indicated, but it’s immovable. I’ll try inspecting the shaft surface. There’s just one small piece of reflective tape on the chuck.

-- Kim, Ajijic, Mexico, http://tinyurl.com/7w5fm25

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Madmark2

2835 posts in 1703 days


#3 posted 05-08-2021 08:42 PM

The knob has an arrow or line diametrically opposite the setscrew (or it needs one, file a notch exactly opposite of setscrew). The rpm plate is stuck to the chassis. Rotate the shaft to the slow limit. Measure rpm. Attach knob so indicator points to rpm on plate, or mount so setscrew is opposite rpm on plate.

-- The hump with the stump and the pump!

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kmetzger

196 posts in 2933 days


#4 posted 05-08-2021 08:54 PM

Grateful for your advice. I’ll follow it.

-- Kim, Ajijic, Mexico, http://tinyurl.com/7w5fm25

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Madmark2

2835 posts in 1703 days


#5 posted 05-08-2021 08:56 PM

De nada.

-- The hump with the stump and the pump!

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