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Jet Deluxe Xacta Saw 3hp

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Forum topic by JustLikeJames posted 03-19-2016 11:14 PM 1264 views 0 times favorited 50 replies Add to Favorites Watch
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JustLikeJames

132 posts in 1029 days


03-19-2016 11:14 PM

Topic tags/keywords: jet table saw xacta 3hp

I just got done assembling and adjusting my new Jet table saw. I’ve turned it on and off a couple of times but haven’t used it yet. When I hit the stop button, as the blade is slowing down, the belt vibrates (flutters) and makes a horrible noise, almost like the motor is braking to stop the blade. The noise and vibration is only momentary, then the blade slows down quietly from there.

Anybody else have this issue on a Jet table saw? Is it just the motor braking, should I adjust the belt tension, will the issue go away after a little break in time?

Thanks.


50 replies so far

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JustLikeJames

132 posts in 1029 days


#1 posted 03-19-2016 11:17 PM

I would just call tech support about it, but of course I discovered it while they are closed.

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conifur

955 posts in 618 days


#2 posted 03-19-2016 11:26 PM

What is the belt tension like?

-- Knowledge and experience equals Wisdom, Michael Frankowski

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rwe2156

2198 posts in 947 days


#3 posted 03-19-2016 11:27 PM

Yes, mine (Jet Xacta Cut Gold Series) has done it from day 1. After After 10 or 12 years I’m so used to it now I don’t even hear it. I think it does have something to do with braking.

I would call but I’ll be they tell you its normal.

-- Everything is a prototype thats why its one of a kind!!

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JustLikeJames

132 posts in 1029 days


#4 posted 03-19-2016 11:31 PM



What is the belt tension like?

- conifur

I can deflect the belt about 1/4” (at least) with light pressure from one finger. It runs smooth when up to speed, it’s just rough as it slows down. Sounds like it wouldn’t hurt to try adjusting the belt tension. I hope it doesn’t still do it years from now.

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MrUnix

4244 posts in 1666 days


#5 posted 03-19-2016 11:40 PM

I think it does have something to do with braking.

More likely just the centrifugal switch closing during spin down.

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

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JustLikeJames

132 posts in 1029 days


#6 posted 03-19-2016 11:49 PM


I think it does have something to do with braking.

More likely just the centrifugal switch closing during spin down.

Cheers,
Brad

- MrUnix

“Centrifugal switch”, what is that and why would it cause the vibration?

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MrUnix

4244 posts in 1666 days


#7 posted 03-20-2016 02:14 AM

“Centrifugal switch”, what is that and why would it cause the vibration?
- JustLikeJames

Spring loaded switch inside the motor that controls the start circuit. When the motor spins down, it kicks out (or pulls in depending on design) to close the start circuit contacts. It’s what causes the typical ‘clunk’ that can be heard as the motor spins down and frequently confused as being some sort of brake.

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

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knotscott

7224 posts in 2842 days


#8 posted 03-20-2016 11:36 AM

It could be from belt tension, minor deviations in the belts, pulleys, runout in the arbor, flange, or blade, but there’s an electrical phenomenon known as regeneration that’s an electrical interaction with the motor capacitors that can occur at shutdown that causes some minor shuddering for a brief moment. IIRC, the motor basically becomes a generator for a brief period when the motor shuts down…it could indeed correspond to when the centrifugal switch disengages. There are some fixes that involve putting a resistor across the caps, but if the belts are good, and all else is functioning as it should, I wouldn’t worry much about it.

-- Happiness is like wetting your pants...everyone can see it, but only you can feel the warmth....

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JustLikeJames

132 posts in 1029 days


#9 posted 03-20-2016 03:04 PM

Wow, you guys are great! I swear I had replies faster than tech support would even answer the phone.

I’m only worried about it because it’s a sound like it’s not supposed to do that (you know, sometimes you can just tell). Clearly, the belt and pulley are spinning at different speeds when the belt vibrates, then it takes a second for the pulley to grab on again. I just don’t know what’s causing them to get out of sync with each other.

I am going to check the pulley/arbor alignment then I’ll see if tightening the belt makes any difference. If all else fails, I’ll call tech support Monday after work.

Thanks everybody.

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Cato

693 posts in 2779 days


#10 posted 03-20-2016 07:36 PM

I have the 3hp Xacta deluxe and just fired it up and then off. Mine just slowly spins down but doesn’t make any strange noise. It does sound like it is slowly braking but no shudders or vibrations.

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JustLikeJames

132 posts in 1029 days


#11 posted 03-20-2016 08:42 PM



I have the 3hp Xacta deluxe and just fired it up and then off. Mine just slowly spins down but doesn t make any strange noise. It does sound like it is slowly braking but no shudders or vibrations.

- Cato

Thanks, good to hear it isn’t supposed to shudder like mine does. I tightened up the belt and it only made a slight improvement (if at all). Looks like I’ll have to give tech support a call tomorrow. Hopefully I can work it out over the phone with them.

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JustLikeJames

132 posts in 1029 days


#12 posted 03-21-2016 12:40 AM

Just to rule things out, I ran the saw without the blade in and it didn’t make the noise. The motor makes one click during slowdown (which seems normal), but the belt doesn’t vibrate violently. I’ve tried it with multiple blades just to rule that out too, but they all make the belt vibrate during slowdown. Weird.

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Julian

1039 posts in 2157 days


#13 posted 03-21-2016 01:33 AM

I have the same saw; about 5 years old. Mines does not making any noise when I turn it off. It smoothly coasts to a stop.

-- Julian

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TheFridge

5765 posts in 953 days


#14 posted 03-21-2016 02:00 AM

Try tightening the belt up a hair and check?

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

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JustLikeJames

132 posts in 1029 days


#15 posted 03-21-2016 03:27 AM



Try tightening the belt up a hair and check?

- TheFridge

By the way, did you catch my comment about how the vibration/noise doesn’t happen without a blade mounted. Without a blade mounted, it is very smooth slow down.

I have tightened it quite a bit tighter than from the factory. I pulled down on the motor a little. The improvement was very slight, if any. Whatever is triggering the vibration still remains. I didn’t want to risk getting it any tighter (in case there’s such a thing as too tight) and doing more harm than good.

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