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Author Topic: T75 not cutting straight  (Read 655 times)

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Offline ahwoody55

  • Posts: 15
T75 not cutting straight
« on: May 11, 2020, 12:45 PM »
So I  have had my T75 for about a year. When I first got it I was able to cut perfect glue up joints for my live edge tables all the way up to 12 feet long. Now all of a sudden it is cutting a concave. Perfect on the ends but a gap as it goes to the middle of the cut. Checked for anything inside deflecting the blade and cleaned it out good. The blade itself looks good. The rails seem to be square and straight. The cut itself seems to be at a perfect 90 degrees but it leaves a gap in the middle of the cut. Any idea what could be wrong with me or the saw? Thanks

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Offline jonnyrocket

  • Posts: 64
Re: T75 not cutting straight
« Reply #1 on: May 11, 2020, 01:10 PM »
How long of a cut are you seeing this issue with?
To clarify the issue you are describing, you are using the TS75 on the track to straight-line rip two different board. When you line them up for glue, you see an air gap near the middle of the length of the cut while the ends are touching. Is this accurate?

Two things to check:
1- is the material flexing while you are cutting it (if it isn't being supported sufficiently all along the cut line, the flex of the material can cause this issue).
2- Has something happened to your rail? Have you verified that it is still straight?   

Offline Svar

  • Posts: 2090
Re: T75 not cutting straight
« Reply #2 on: May 11, 2020, 01:29 PM »
Is this happening repeatedly on various boards, or is it a specific slab? In addition to things already mentioned deformation could be due to released tension in the wood.

Offline ahwoody55

  • Posts: 15
Re: T75 not cutting straight
« Reply #3 on: May 11, 2020, 01:43 PM »
How long of a cut are you seeing this issue with?
To clarify the issue you are describing, you are using the TS75 on the track to straight-line rip two different board. When you line them up for glue, you see an air gap near the middle of the length of the cut while the ends are touching. Is this accurate?

Two things to check:
1- is the material flexing while you are cutting it (if it isn't being supported sufficiently all along the cut line, the flex of the material can cause this issue).
2- Has something happened to your rail? Have you verified that it is still straight?

You are correct. These are walnut slabs that have already been planed and flattened The cuts will run any where from 7' to 10' long. The slabs are almost 2" thick and I am clamping them down on my work table with the edge to be cut overhanging the side of the table. I cant imagine I am getting any deflection. I did cut the whole 2" thickness with one pass. Maybe I should try doing 3 or 4 passes. The track seems to be square and straight.

Offline ahwoody55

  • Posts: 15
Re: T75 not cutting straight
« Reply #4 on: May 11, 2020, 01:47 PM »
Is this happening repeatedly on various boards, or is it a specific slab? In addition to things already mentioned deformation could be due to released tension in the wood.

It is on different slabs. This is kiln dried material that has been planed. I checked and adjusted the saw on the track so there is no slop or any movement

Offline scbucc

  • Posts: 17
Re: T75 not cutting straight
« Reply #5 on: May 11, 2020, 02:10 PM »
I had the same problem awhile back when connecting 2 or more tracks.  If you are connecting tracks for long cuts try Betterley's SLC23 stright line connector.  I haven't had a problem since.  Leave a small gap between the tracks and this will straighten the rails prior to locking them in line.
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Offline ahwoody55

  • Posts: 15
Re: T75 not cutting straight
« Reply #6 on: May 11, 2020, 05:04 PM »
I had the same problem awhile back when connecting 2 or more tracks.  If you are connecting tracks for long cuts try Betterley's SLC23 stright line connector.  I haven't had a problem since.  Leave a small gap between the tracks and this will straighten the rails prior to locking them in line.

Thanks, I will give it a try. LOL they are not cheap I see.

Offline Michael Kellough

  • Posts: 4778
Re: T75 not cutting straight
« Reply #7 on: May 11, 2020, 05:29 PM »
If the saw is adjusted to the rail and the rail is straight then it’s like Svar said, tension in the wood. Just cut again now that the tension is released. If the rail is straight the cut will be too.

If you want to join two cut slabs then park them a mm or so apart and re-cut both at once and they’ll match.

Offline ahwoody55

  • Posts: 15
Re: T75 not cutting straight
« Reply #8 on: May 11, 2020, 05:56 PM »
If the saw is adjusted to the rail and the rail is straight then it’s like Svar said, tension in the wood. Just cut again now that the tension is released. If the rail is straight the cut will be too.

If you want to join two cut slabs then park them a mm or so apart and re-cut both at once and they’ll match.

Thanks, Now I am guessing it is the track. I even tried splitting the kerf like you said with the slabs together and still had the same issue. I just ordered the Betterley SLC23 and will give that a try. If that doesnt work I will just order the 118" track. I didnt get that one when I bought the saw because I didnt have room but I have since moved into a larger shop space and have plenty of storage room

Offline jcrowe1950

  • Festool Dealer Affiliate
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  • Posts: 51
    • Woodcraft Chattanooga, TN
Re: T75 not cutting straight
« Reply #9 on: June 02, 2020, 09:06 PM »
If the saw is adjusted to the rail and the rail is straight then it’s like Svar said, tension in the wood. Just cut again now that the tension is released. If the rail is straight the cut will be too.

If you want to join two cut slabs then park them a mm or so apart and re-cut both at once and they’ll match.

Thanks, Now I am guessing it is the track. I even tried splitting the kerf like you said with the slabs together and still had the same issue. I just ordered the Betterley SLC23 and will give that a try. If that doesnt work I will just order the 118" track. I didnt get that one when I bought the saw because I didnt have room but I have since moved into a larger shop space and have plenty of storage room

    I realize this is way late to the game, but here are my suggestions.....

     1) Make sure your blade is clean.
     2) Make sure your guide rail is clamped to the slabs at both ends.
     3) Consider multiple passes and possibly even a lower tooth count blade.
     4) Perhaps most important, pay attention to pushing the saw without any lateral pressure. This has   been a common issue with track saw customers having such problems.
     5) Consider a cut to approximated the final cut and then do a full depth shaving cut for the final jointing operation.

    Let us know how this issue resolves.
Festool Specialist at Woodcraft, Chattanooga, TN