Author Topic: TS 75 launches backwards while plunging  (Read 1874 times)

0 Members and 1 Guest are viewing this topic.

Offline Kodi Crescent

  • Posts: 722
TS 75 launches backwards while plunging
« on: September 10, 2018, 08:57 AM »
I have a TS 55 and TS 75.  I use the 55 frequently, the 75 very rarely.  I have had the 75 apart previously in an attempt to calibrate to the same splinter guard cut line as the 55 (I was unsuccessful at doing this).

This weekend, I was cutting into a glued set of (3) 2x pressure treated material.  While cutting on the rail, I could plunge my 55 to full depth and move forward in the cut without a problem.  Nice and smooth.  When I tried the same with the 75, the saw would bind and jump backwards dangerously.

I know PT generally binds if you cut it straight from the lumber yard.  However, this PT had been drying for several weeks, and was probably in the 18% moisture range before I used it.  It was machined to S4S prior to cutting, as it was part of a large arch glue up.

Would toe in/toe out problems with the 75 cause the binding and jumpiness?  If so, how would I check and fix without sending it in to Festool?


Festool USA does not pre-approve the contents of this website nor endorse the application or use of any Festool product in any way other than in the manner described in the Festool Instruction Manual. To reduce the risk of serious injury and/or damage to your Festool product, always read, understand and follow all warnings and instructions in your Festool product's Instruction Manual. Although Festool strives for accuracy in the website material, the website may contain inaccuracies. Festool makes no representations about the accuracy, reliability, completeness or timeliness of the material on this website or about the results to be obtained from using the website. Festool and its affiliates cannot be responsible for improper postings or your reliance on the website's material. Your use of any material contained on this website is entirely at your own risk. The content contained on this site is provided for informational purposes only and does not constitute professional advice.


Offline Peter_C

  • Posts: 699
Re: TS 75 launches backwards while plunging
« Reply #1 on: September 10, 2018, 09:28 AM »
Assuming the saw setup is correct. Use the stop it came with behind the saw. Plunge slower...

Offline Don T

  • Posts: 1821
  • Phoenix, Az
Re: TS 75 launches backwards while plunging
« Reply #2 on: September 10, 2018, 09:35 AM »
Make sure the saw is up to full speed also. That was the only time I’ve had that happen.
RO150, C12, DF 500 Q, CT33, TS75, MFT3, Kapex 120, MFT3/Kapex, MFK 700, RO 90, ETS150/3, CT22, Centrotec Installers Kit, Parallel Guides & Ext, Carvex, OF1400, LR32 Set, MFS400 w/700 rails, KA UG Set, First Aid Kit, RTS 400 EQ, Vecturo OS400 Set, CT Wings, CT Drill Guide, Pro 5, CXS, C18, HL850, Vac Sys set

Offline SRSemenza

  • Global Moderator
  • *
  • Posts: 8614
  • Finger Lakes Region, NY State , USA
Re: TS 75 launches backwards while plunging
« Reply #3 on: September 10, 2018, 09:40 AM »
Do you have any trouble with it when not plunging into the wood?  Fully plunged before entering the cut.

Try this to eliminate the possibility that something is out of adjustment. Beyond that I would say what has been posted is on target.

Seth

Offline RKA

  • Posts: 1258
Re: TS 75 launches backwards while plunging
« Reply #4 on: September 10, 2018, 09:56 AM »
Your subject seems to answer this, but let's clarify anyway.  The saw is kicking back during the plunge itself but before you actually move the saw forward?  If that is the case, it's probably your technique.  The larger blade in dimensional lumber will have quite a bit more contact area with the wood during the plunge compared to a 55 saw.  Go slow, particularly if you're using the crosscutting blade while ripping.  I use the little anti=kickback do-hickey on the back of the saw base even when plunging into 3/4" ply with my 55.  I would use that here assuming the 75 has a little notch on the back of the plate to receive that. 

If the kickback occurs after you plunge and while you begin moving forward, I would look at toe out.  Skim the edge of the board and look for striations that match the direction of the circular blade profile on the back edge of the blade.  If they are pronounced, it may indeed be toe'd out. 
-Raj

Offline Michael Kellough

  • Posts: 3573
Re: TS 75 launches backwards while plunging
« Reply #5 on: September 10, 2018, 11:00 AM »
Agree with @RKA  Do you have enough runway to get the 75 fully plunged before cutting? The larger diameter blade changes the geometry of the kickback potential from down and back to almost fully back.

Plunge slowly and either use the stop block or literally clamp the saw/rail/work together. You might also maximize the cutting depth to change the kickback geometry to pull the saw down instead of push back.

Offline RobBob

  • Posts: 1324
Re: TS 75 launches backwards while plunging
« Reply #6 on: September 10, 2018, 01:15 PM »
Agree with @RKA  Do you have enough runway to get the 75 fully plunged before cutting? The larger diameter blade changes the geometry of the kickback potential from down and back to almost fully back.

Plunge slowly and either use the stop block or literally clamp the saw/rail/work together. You might also maximize the cutting depth to change the kickback geometry to pull the saw down instead of push back.

I agree with Michael and RKA.  Are you using the guide rail that came with the TS55?  If so, it is too short for the TS75 for some wide cuts on sheet goods.  A longer rail would allow you to start the saw without plunging.  Otherwise, use the stop.
« Last Edit: September 10, 2018, 07:25 PM by RobBob »

Offline rst

  • Posts: 2003
Re: TS 75 launches backwards while plunging
« Reply #7 on: September 10, 2018, 06:34 PM »
Much more leverage with the 75.  I only plunge with a stop.  I had to cut two door lite kits last week using my 18v Milwaukee steel cutting saw.  Definitely an anal puckering job, thumb on the base, lock off the depth lever.  I keep procrastinating getting a steel cutting blade for my Makita as I've been doing it this way for quite a few years.  Every time I cut like this I think of the gory pics on the Carpenters Talk Group...mostly British carpenters, maybe I'm just getting old.

Offline Peter Halle

  • Global Moderator
  • *
  • Posts: 11560
Re: TS 75 launches backwards while plunging
« Reply #8 on: September 10, 2018, 08:32 PM »
This isn't a tool issue and I have moved it out of the tool problems area.  The TS saws and frankly any circular saw can kick back when plunged.  The TS saws come with a stop to place on the rail to control this.  The TS-75 has more torgue than the TS-55.

Peter

Offline Naildrivingman

  • Posts: 487
Re: TS 75 launches backwards while plunging
« Reply #9 on: September 10, 2018, 09:40 PM »
I believe I have experienced a similar issue as well as the same issue the OP stated. If I am ripping a full sheet, my 75 will sometimes “suck down” while plunging at the beginning of the cut. I attribute this to using the 106” rail vs the 118”.  The 75 was my very first FT purchase and the 106” was what was recommended to me. Knowing what I know now, I would buy the 118”.  If I minimize the blade depth, the “suck” is not as dramatic, but it never completely goes away. I believe my experience is normal and not a problem.
Dance with who brung ya...

Offline Bullterrier

  • Posts: 13
Re: TS 75 launches backwards while plunging
« Reply #10 on: September 11, 2018, 03:47 AM »
Especially given you have adjusted it unsuccessfully before I would start with checking toe in as per the TS 55 supplemental guide. Assuming you have feeler gauges it’s easy to check but a pain to adjust.

If the back of the blade is contacting hard it will cause the saw to lift as you plunge.

The difference in cut (perceived saw effort, lack of burning and also smoothness of the cut face) when properly aligned is huge.

Offline Gregor

  • Posts: 1019
Re: TS 75 launches backwards while plunging
« Reply #11 on: September 11, 2018, 10:40 AM »
There's a reason why the anti-kickback stop can be attached to the TS75 base when it's not in use on the rail: to always have it ready.

Never plunge without it. Take the 5s to take it off the saw and put it onto the rail - your wrists, rail and workpiece will thank you.