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Sliding Table Saw Shutting Itself Off

 

Hi All,

I’ve had an odd problem pop up today with my K940S slider. The saw is shutting itself off, seemingly spontaneously. Initially it happened a couple of times this morning when I was starting a cut, so I slowed the feed rate down and didn’t think much of it. But it began to happen more frequently, and then it began shutting off without any wood contacting the blade. Right now it isn’t usable at all. I can start it up just fine and it sounds like it’s running fine, but as soon as I start to move the sliding table forward, the blade powers down. This saw doesn’t have the flesh sensing technology. It does have the extra switch located at the end of the sliding table, I wonder if that could be part of the problem. My dust collector has been acting up a bit, so there is more dust accumulating in and around the saw than usual, maybe that is a contributing factor? Seems like the saw should be able to handles some dust build-up though. Have any of you run into anything similar to this in the past?

Greg
 

Greg,

This is a long shot as my saw does not have on and off switches on the slider, but the reason I chose not to have them was just this issue, if it is indeed what I think it is. If I’m not mistaken, Felder designed these switches in such a way that the current is carried through the bearing ways, so you must clean them frequently in order to avoid such problems. Try cleaning them really well and see what happens.?

Hope this helps.
Mariusz
 

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Hi Greg,

I agree with Mariusz if you have a stop switch on the end of the slider. Only the stop switch uses the rails for carrying the current.

It has also been reported here that this circuit is susceptible to heat. My K975 without this feature has a max operating temp of 40C (104F). I am not sure if your saw has the same max operating temp.

HTH.

Imran Malik

On Jun 6, 2024, at 4:17?AM, mariusz_m via groups.io <mariusz_m@...> wrote:

?

Greg,

This is a long shot as my saw does not have on and off switches on the slider, but the reason I chose not to have them was just this issue, if it is indeed what I think it is. If I’m not mistaken, Felder designed these switches in such a way that the current is carried through the bearing ways, so you must clean them frequently in order to avoid such problems. Try cleaning them really well and see what happens.?

Hope this helps.
Mariusz
 

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Mariusz is certainly correct that it could be the remote stop circuit at the end of the sliding table if you have that option. ?But that’s not all that could be causing this. ?My Kappa 400 (which is a version of the K940S base machine) has two micro switches that will cause the saw to stop running when triggered - even in the middle of a cut. ?One microswitch is on the hinged door located below the outfeed table extension (back side of the chassis). ?The other microswitch (which is temperamental as hell) senses the hinged blade guard is fully closed. ?Sawdust can accumulate inside the blade guard area and keep that switch from fully closing. ?Also, the hinge mechanism is pretty flimsy and can be bend out of place if you force the blade guard closed which will keep the switch from engaging properly. ? Here’s a photo of where the switch is located.

screenshotx_0082.jpeg

David Best
DBestWorkshop@...
https://www.flickr.com/photos/davidpbest/collections/
https://www.youtube.com/@David_Best



On Jun 5, 2024, at 9:44?PM, Greg via groups.io <ghcustomwoodwork@...> wrote:

?Hi All,

I’ve had an odd problem pop up today with my K940S slider. The saw is shutting itself off, seemingly spontaneously. Initially it happened a couple of times this morning when I was starting a cut, so I slowed the feed rate down and didn’t think much of it. But it began to happen more frequently, and then it began shutting off without any wood contacting the blade. Right now it isn’t usable at all. I can start it up just fine and it sounds like it’s running fine, but as soon as I start to move the sliding table forward, the blade powers down. This saw doesn’t have the flesh sensing technology. It does have the extra switch located at the end of the sliding table, I wonder if that could be part of the problem. My dust collector has been acting up a bit, so there is more dust accumulating in and around the saw than usual, maybe that is a contributing factor? Seems like the saw should be able to handles some dust build-up though. Have any of you run into anything similar to this in the past?

Greg

 

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David,

Greg said it powers up but shuts down as soon as he moves the slider so the first thing I would look for would be related to the slider. You are correct that the micro switches, especially one on the blade cover, could misbehave with accumulation of the saw dust.

I failed to mention that besides the rail being dirty there are 2 electrical connections one on each side of the AL extrusion below the slider and one or both could have come loose. I would also check the interconnect between the chassis and the slider for the remote switch cabling.

Imran Malik

On Jun 6, 2024, at 7:40?AM, David P. Best via groups.io <dbestworkshop@...> wrote:

?
Mariusz is certainly correct that it could be the remote stop circuit at the end of the sliding table if you have that option. ?But that’s not all that could be causing this. ?My Kappa 400 (which is a version of the K940S base machine) has two micro switches that will cause the saw to stop running when triggered - even in the middle of a cut. ?One microswitch is on the hinged door located below the outfeed table extension (back side of the chassis). ?The other microswitch (which is temperamental as hell) senses the hinged blade guard is fully closed. ?Sawdust can accumulate inside the blade guard area and keep that switch from fully closing. ?Also, the hinge mechanism is pretty flimsy and can be bend out of place if you force the blade guard closed which will keep the switch from engaging properly. ? Here’s a photo of where the switch is located.

<screenshotx_0082.jpeg>


David Best
DBestWorkshop@...
https://www.flickr.com/photos/davidpbest/collections/
https://www.youtube.com/@David_Best



On Jun 5, 2024, at 9:44?PM, Greg via groups.io <ghcustomwoodwork@...> wrote:

?Hi All,

I’ve had an odd problem pop up today with my K940S slider. The saw is shutting itself off, seemingly spontaneously. Initially it happened a couple of times this morning when I was starting a cut, so I slowed the feed rate down and didn’t think much of it. But it began to happen more frequently, and then it began shutting off without any wood contacting the blade. Right now it isn’t usable at all. I can start it up just fine and it sounds like it’s running fine, but as soon as I start to move the sliding table forward, the blade powers down. This saw doesn’t have the flesh sensing technology. It does have the extra switch located at the end of the sliding table, I wonder if that could be part of the problem. My dust collector has been acting up a bit, so there is more dust accumulating in and around the saw than usual, maybe that is a contributing factor? Seems like the saw should be able to handles some dust build-up though. Have any of you run into anything similar to this in the past?

Greg

 

My suspicion is that you all are on the right track with something being obstructed by dust, my dust collector filters had become clogged with fine dust. I spent a couple hours doing a full tear down and clean out of the dust collector last night, so that should be back in order. I'm going to do a thorough clean of the saw first thing today and see if that takes care of the problem. Any suggestions on getting the bearing ways for the sliding table cleaned up besides just blowing them out with compressed air?

Thanks to all of you for taking the time to respond.

Greg
 

Greg, I’m not positive and I’m not near my machine to check it, but I believe there might be a sticker on the lower part of the sliding table that indicates that compressed air should not be used to clean the bearing ways. I would use vacuum and a rag.?

In Europe Felder recommends using Ballistol (not sure if it is available in the US) pretty much for everything instead of using grease. Ballistol supposedly does not attract dust.?

Mariusz
 

Thanks for the heads up on that Mariusz, I ended up just using a vacuum and rag anyways. And yes, we can get Ballistol here in the States.

I got everything cleaned up, but that didn't fully solve the problem. I discovered that the blade was only shutting down when the carriage was out at full extension before making a cut. By "choking up" a bit, I was able to get back to work. I moved the crosscut fence and outrigger about 16" in from the end of the table, so I didn't have to pull the table to full extension. Not a problem for this project, I'm only cutting 4' lengths. But I suspect something is out of alignment with the table, so at some point when I have a break in the action I'll loosen the bolts and go through the leveling and alignment process again and see if that takes care of it. I'm betting it has to do with the electrical connection running through the rails to the secondary on/off switch being interrupted.
 

I wouldn't use the Ballistol, a bunch of us tried it when we found out Felder suggested it and I know my results were terrible. Best solution for me is a paper towel with mineral spirits on it and wipe the races with the table all the way at each extremity. Do it several times until the paper towels come out clean and then just dry with a clean paper towel and you are good to go.

Brian Lamb
blamb11@...
lambtoolworks.com


On Thursday, June 6, 2024 at 06:15:02 PM MST, Greg <ghcustomwoodwork@...> wrote:


Thanks for the heads up on that Mariusz, I ended up just using a vacuum and rag anyways. And yes, we can get Ballistol here in the States.

I got everything cleaned up, but that didn't fully solve the problem. I discovered that the blade was only shutting down when the carriage was out at full extension before making a cut. By "choking up" a bit, I was able to get back to work. I moved the crosscut fence and outrigger about 16" in from the end of the table, so I didn't have to pull the table to full extension. Not a problem for this project, I'm only cutting 4' lengths. But I suspect something is out of alignment with the table, so at some point when I have a break in the action I'll loosen the bolts and go through the leveling and alignment process again and see if that takes care of it. I'm betting it has to do with the electrical connection running through the rails to the secondary on/off switch being interrupted.

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