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Author Topic: Carvex 420 cannot cut straight - Problem Solved  (Read 12907 times)

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Offline JimH2

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Carvex 420 cannot cut straight - Problem Solved
« on: February 08, 2015, 01:48 PM »
Cuts start straight but then the blade starts to bend like a banana. Always to the right and in the process burns the center of the blade. When removed the blade is straight (no permanent bend). Material was 5/4" pine. I had not used it for anything other than thin plywood up until the 5/4 pine. It may have been doing it before, but it was not noticeable in 1/4" plywood.

I will say that after I made the first cut which was a straight line cut I noticed the cut was not quite perpendicular. I switched blades and it got worse with the next cut. Any ideas?

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Offline Festool USA

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Carvex 420 cannot cut straight - Problem Solved
« Reply #1 on: February 08, 2015, 02:01 PM »
Which blade are using?

Did you set the carbide jaws to the blade?

Are you pushing the cut or letting the saw do the job?

Offline Staniam

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Carvex 420 cannot cut straight - Problem Solved
« Reply #2 on: February 08, 2015, 02:17 PM »
Can you describe how you have the Carvex set up? On guide rail, which base, power/speed setting and which pendulum setting?

Recommendations:

Triple checking you're using the right blade for the cut
Set speed to "A"
Set Pedulum to "3"
Don't force the Carvex forward, its powerful so it should go by itself with minimal forward force
Adjust the blade "teeth" to the blade. Tighten all the way then loosen about a quarter turn
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Offline JimH2

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Carvex 420 cannot cut straight - Problem Solved
« Reply #3 on: February 08, 2015, 05:15 PM »
Can you describe how you have the Carvex set up? On guide rail, which base, power/speed setting and which pendulum setting?

Recommendations:

Triple checking you're using the right blade for the cut
Set speed to "A"
Set Pedulum to "3"
Don't force the Carvex forward, its powerful so it should go by itself with minimal forward force
Adjust the blade "teeth" to the blade. Tighten all the way then loosen about a quarter turn

I was on rail with the pendulum set to 3 using a FSG 75/4 blade.

The problem has resolved itself. It looks like a some point a small piece of the splinter guard came off and wedged itself between the blade guide giving it zero support. I took the plastic piece out and tightening the blade guide down just enough for it to be slightly loose. I'm back in the game.

Thanks for the quick responses.

Offline Festool USA

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Re: Carvex 420 cannot cut straight - Problem Solved
« Reply #4 on: February 08, 2015, 07:18 PM »
For the benefits of others, and you @JimH2, we do not recommend using the jigsaws on the guide rail with materials thicker than 18mm (3/4").

Shane

Offline ear3

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Re: Carvex 420 cannot cut straight - Problem Solved
« Reply #5 on: February 09, 2015, 08:22 AM »
Just curious as to the mechanics behind this recommendation?

For the benefits of others, and you @JimH2, we do not recommend using the jigsaws on the guide rail with materials thicker than 18mm (3/4").

Shane
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Offline Festool USA

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Re: Carvex 420 cannot cut straight - Problem Solved
« Reply #6 on: February 09, 2015, 08:37 AM »
Materials any thicker and the jigsaw is fighting the guide rail essentially. Of course, the type of material can change that but it's a general rule of thumb.

Offline ear3

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Re: Carvex 420 cannot cut straight - Problem Solved
« Reply #7 on: February 09, 2015, 10:09 AM »
Materials any thicker and the jigsaw is fighting the guide rail essentially. Of course, the type of material can change that but it's a general rule of thumb.

Got it.  Thanks.
Kapex KS 120 w/UG Cart and Extensions • CXS Set • T18+3 w/Centrotec Installer's Set • PDC 18/4 • TS 75 • TSC 55 • HKC 55 w/250, 420 and 670 FSK rails • Carvex 420 w/Accessory Kit • Domino 500 Set • Domino 700 XL • OF 2200 w/Base Accessory Kit • OF 1400 • OF 1010 • MFK 700 EQ Set • LR 32 • MFS 400 w/2000, 1000, and 700 extensions • Rotex 90 • Rotex 150 • LS 130 • ETS-EC 150/5 • ETS-EC 150/3 • ETS 150/3 • Pro 5 LTD • RTS 400 • RAS 115.04 • RS 2 • HL 850 • Vecturo OS 400 • CT 26 w/BT module • CT Sys w/Long-Life Bag • MFT/3

Offline wow

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Re: Carvex 420 cannot cut straight - Problem Solved
« Reply #8 on: February 09, 2015, 11:02 AM »
Materials any thicker and the jigsaw is fighting the guide rail essentially. Of course, the type of material can change that but it's a general rule of thumb.

OK, I must be stupid today. Why would the thickness of the material have an effect on whether or not the saw fights the rail? The rail only adds - what - 5mm in height? Assuming the cut is at 90 degrees, the thickness of the material wouldn't seem to me to be a factor. Or to put it another way, wouldn't the thickness then be a problem with or without the rail?

Tell me what I am missing?
Trying to be one of the most helpful members on the FOG.

Offline Festool USA

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Re: Carvex 420 cannot cut straight - Problem Solved
« Reply #9 on: February 09, 2015, 11:06 AM »
With the rail, you're basically forcing the jigsaw and blade down a specific path. Due to the grain and other factors, the blade will have a natural path it wants to follow. These small deviations are normally unnoticeable and not a factor when cutting by hand. But are multiplied when on the rail. The greater the thickness of the material, the more it will want to try to follow this natural path and deviate from the course of the guide rail. They are fighting against one another.

Offline wow

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Re: Carvex 420 cannot cut straight - Problem Solved
« Reply #10 on: February 09, 2015, 11:11 AM »
With the rail, you're basically forcing the jigsaw and blade down a specific path. Due to the grain and other factors, the blade will have a natural path it wants to follow. These small deviations are normally unnoticeable and not a factor when cutting by hand. But are multiplied when on the rail. The greater the thickness of the material, the more it will want to try to follow this natural path and deviate from the course of the guide rail. They are fighting against one another.

OK - so you naturally/unconsciously correct for the grain and other variances when cutting by hand, which you can't do when the saw is on the rail. Got it!

Thanks for the explanation.
Trying to be one of the most helpful members on the FOG.

Offline windmill man

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Re: Carvex 420 cannot cut straight - Problem Solved
« Reply #11 on: February 09, 2015, 04:23 PM »
How does forcing a jigsaw down a rail differ from forcing it down a straight line , you have marked   [unsure]

Offline Festool USA

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Re: Carvex 420 cannot cut straight - Problem Solved
« Reply #12 on: February 09, 2015, 04:24 PM »
How does forcing a jigsaw down a rail differ from forcing it down a straight line , you have marked   [unsure]

Binding.

Maybe I'm not doing a good job of explaining it. Our recommendation is a maximum of 3/4" using the guide rail adapter for the jigsaws. If you choose to use it on thicker materials, you may not get the best results.

Offline windmill man

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Re: Carvex 420 cannot cut straight - Problem Solved
« Reply #13 on: February 09, 2015, 04:26 PM »
Mmmmmm interesting

Thanks Shane

Offline Festool USA

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Re: Carvex 420 cannot cut straight - Problem Solved
« Reply #14 on: February 09, 2015, 04:38 PM »
From the Trion manual, for instance...

Quote
The use of the Festool guide system FS facilitates
the production of straight and precise cuts, particularly
with material thicknesses up to 20 mm
(1/4").

Apparently they aren't good at metric to imperial conversion, since that would be closer to 3/4".

Offline jmbfestool

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Re: Carvex 420 cannot cut straight - Problem Solved
« Reply #15 on: February 09, 2015, 05:32 PM »
Carvex body and blade are pretty parallel to each other, allowing you to use a guide rail.
  You will find many other brands this isn't possible.

You will find if you was going free hand with other branded jigsaws after couple inches into work piece the jigsaw body will be "drifting" going sideways yet you are cutting "straight" forward.   You naturally turn the body of the jigsaw as you are fallowing the line to stay on track.   Now if you had a fence to run along you wouldn't be able to turn the jigsaw body so instead the blade will start to bend outwards/inwards. Cutting Thinner material blade will cope but thicker materials it won't.  Even the carvex isn't perfect and has its limits and although it might appear perfectly parallel it won't be and thicker material will show this. 

Another point with free hand. While you are turning left right left right slightly as you are trying to stay straight and fallow the line you take the strain out of the blade because you are breaking the natural path the blade is trying to fallow.

other factors which cause problems when Guide railing it is blade wear. If one side of the blade has started to wear out slightly then the blade will try and drift, in thinner material this won't be noticeable but thicker material its exaggerated so it tries the wander.  Free hand this wouldn't be as noticeable or a problem because you would turn the jigsaw body as soon as you notice the blade not going the direction you dont want it to.

Also type of wood and the grain of the wood again free hand with the slight turns tweaking its direction as you are cutting breaks the the path the blade wants to try and fallow. 
« Last Edit: February 10, 2015, 03:00 AM by jmbfestool »
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Offline glass1

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Re: Carvex 420 cannot cut straight - Problem Solved
« Reply #16 on: February 09, 2015, 06:30 PM »
My Trion like all jig saws I have owned before deflects very easily. I find anything beyond a short cut to be unreliable. No matter the material. Obviously the thicker and harder the more challenging. I have yet to try the Mafell. I feel most of us have unreasonable or hopes for the jig saws abilities. 

Offline Festool USA

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Re: Carvex 420 cannot cut straight - Problem Solved
« Reply #17 on: February 09, 2015, 06:37 PM »
@jmbfestool, that might be the most eloquent thing you've ever said! [tongue] very well said.

@glass1, you should be able to easily achieve cuts without the deflection with your jigsaw. Are you setting the carbide jaws correctly? Which blade are you using?
« Last Edit: February 09, 2015, 06:41 PM by Shane Holland »

Offline glass1

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Re: Carvex 420 cannot cut straight - Problem Solved
« Reply #18 on: February 09, 2015, 06:47 PM »
I do like my trion except the sight line is not good with the front plastic shroud on. I leave it off. I just feel people have unreasonable exceptatations of jig saws especially with festool. I probably am not as diligent as I should be with the carbide blocks. I am building a large custom stair now and doing quite a few scribe cuts on large glue up stair treads that die into a stone chimney.  I will get some festool blades in the am. I am cutting 3/4" mahogany what blade(s) do you recommend. Thx

Offline Festool USA

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Re: Carvex 420 cannot cut straight - Problem Solved
« Reply #19 on: February 09, 2015, 06:56 PM »
The FSG blade is best for perpendicular cuts.

http://www.festoolusa.com/search/?q=Fsg

Let the jigsaw do the work.

Offline mike_aa

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Re: Carvex 420 cannot cut straight - Problem Solved
« Reply #20 on: February 10, 2015, 12:18 PM »
Reading this got me thinking ???  Would it be beneficial to have an attachment where the jig saw could pivot slightly as it slides on the guide rail keeping the blade from binding?  I'm comparing this to a bandsaw that is used to cut through thicker material where a pivot point fence is used to compensate for blade drift.

Mike A.

Offline Festool USA

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Re: Carvex 420 cannot cut straight - Problem Solved
« Reply #21 on: February 10, 2015, 12:20 PM »
I think it's more of a question of the right tool for the job. For straight cuts in thick material, the right tool is a track saw or table saw.

Offline glass1

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Re: Carvex 420 cannot cut straight - Problem Solved
« Reply #22 on: February 10, 2015, 11:00 PM »
Its definitely worth the time to get festool blades and adjust the carbide blocks. Is the carvex smoother than the trion ie less vibration. Not that the trion vibrates too much but just wondering if it has less vibration ? Anybody have any side by side comparison ? thx in advance.

Offline Festool USA

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Re: Carvex 420 cannot cut straight - Problem Solved
« Reply #23 on: February 10, 2015, 11:06 PM »
Its definitely worth the time to get festool blades and adjust the carbide blocks. Is the carvex smoother than the trion ie less vibration. Not that the trion vibrates too much but just wondering if it has less vibration ? Anybody have any side by side comparison ? thx in advance.

So, you got good results then and corrected the deflection issues?

Offline glass1

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Re: Carvex 420 cannot cut straight - Problem Solved
« Reply #24 on: February 13, 2015, 06:59 PM »
Better yes. I still I am always disappointed with the jig saw. The festool is nicer than any that I have used to date but I find it difficult to get a perpendicular cut.

Offline fdeloncker

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Re: Carvex 420 cannot cut straight - Problem Solved
« Reply #25 on: February 25, 2015, 08:02 PM »
I too have had many issues with my carvex making perpendicular cuts.

Today I attempted to use the circle jig for the first time and my cut wandered more than an 1/8th within 3" into the cut (on a massive radius btw). It burned up the blade (again...) and caused sparks to fly. I understand that the lever should point forward to 3, pull the blade back, tighten and finally loosen 1/4 turn. Todays cut was with a s75/4 fs blade.

I have watched many videos, asked the folks at the local rockler, when they were a vendor, but they had no clue. I spoke with a rep at demo a while back and he explained to me how to do it, but I am still not getting it or its my saw. He was making cuts in huge stock; something like 5" thick pine and getting good cuts.

 [scared] HELP

Offline MGB

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Re: Carvex 420 cannot cut straight - Problem Solved
« Reply #26 on: February 27, 2015, 12:09 AM »
^ Do you have your centering pin on the correct side of the circle cutter?


Offline fdeloncker

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Re: Carvex 420 cannot cut straight - Problem Solved
« Reply #27 on: February 27, 2015, 09:22 AM »
At first I wasnt sure if it was on the correct side, but I noticed that others use the pin on the same side as the saw so I think that is the suggested way.?

After several attempts and many blades I realized the blade is not perpendicular to the base, therefore causing it to track inward or outward depending on the rotation I am traveling. I checked it with a quality square. I have it boxed up and am leaving to go drop it off at ups for service as soon as i finish this message. Sad, because I really need it this weekend for this project I am building.

 [crying]

Offline lwillis

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Re: Carvex 420 cannot cut straight - Problem Solved
« Reply #28 on: March 04, 2018, 06:49 PM »
I have the same issue.   My new Carvex PSB 420 EBQ won't cut a straight line, it always veers to the left.    I have burned several blades.  I've tried with and without the splinter guard.  I've made sure the blade guide is properly tightened (tighten all the way, then back off 1/4 turn, so that there's a slight amount of play).

I'm trying to cut 3/4" Mellamine, using a S75/2.5 blade, and the tracksaw guide.   But every cut drifts to the left.   I've checked the blade guide, and I don't see any gunk or bits stuck inside it.  I've tried every setting from 1 to 3.

Is there anything I can do besides return the saw?

Online Peter Halle

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Re: Carvex 420 cannot cut straight - Problem Solved
« Reply #29 on: March 04, 2018, 08:29 PM »
Festool doesn't recommend cutting 3/4" material with the Carvex on a rail as has been posted here prior.  If this is a normal thing for you then I would suggest returning the saw.   << EDIT:  see corrected post with copy of owner's manual below in this thread>>

Peter

« Last Edit: March 05, 2018, 08:13 AM by Peter Halle »