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Author Topic: Kapex exploding beading issue  (Read 1620 times)

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Offline glynster

  • Posts: 9
Kapex exploding beading issue
« on: June 02, 2018, 11:06 AM »
Recently I have been cutting a lot of moulding/beading (1/2" square roughly) and I can tell you its a white knuckle ride to say the least. In fact I have even resorted to cutting beading by hand lately as I have had beading literally explode on me firing sharp shards of timber across the room. I am aware its probably because I am still using the stock blade. I can just about get a clean cut on mitre-ing beading if I go REEEAAALLLY slow and careful but still one in 10 will shatter.

Anybody else had this experience? The blade is still sharp. Would a very fine blade be a better solution? I am guessing the rake of the teeth is too big that sometimes the beading gets caught in it and shatters rather than being cut.

Cheers - asking because I have a MASSIVE room to wainscot and I have a ton of beading to cut.
"I've always been a libertarian. Leave everybody alone. Let everybody else do what they want. Just stay out of everybody else's hair." Clint Eastwood

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Online Peter Halle

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Re: Kapex exploding beading issue
« Reply #1 on: June 02, 2018, 11:15 AM »
I would suggest making a sacrificial fence to protect your workpiece on the exit side.

Peter

Offline Cheese

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Re: Kapex exploding beading issue
« Reply #2 on: June 02, 2018, 11:23 AM »
Peter's suggesting something like this.
« Last Edit: June 02, 2018, 11:27 AM by Cheese »

Offline rst

  • Posts: 1869
Re: Kapex exploding beading issue
« Reply #3 on: June 02, 2018, 01:03 PM »
I use 1/4" tempered fiberboard.  I use spring clamps to hold the 3" vertical pieces and the verticals hold the horizontal piece (just larger than the max cutoff width) down.  I have used 2"x 1/4" wooden door sash for the verticals on the new 18v 7 1/4" Milwaukee sliding chop saw I recently bought.  I just did this Friday and made a zero clearance insert from 1/4" UHMW for the base.

Offline Tim Raleigh

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Re: Kapex exploding beading issue
« Reply #4 on: June 02, 2018, 01:27 PM »
Anybody else had this experience?
Yes, I have had this problem in the past. I did blame it on the tool because I am an ignoramus.

Would a very fine blade be a better solution?

No, I don't believe a different blade will solve this problem. I do believe if you lower the blade as shown in this post by @jonny round boy kapex-'depth-of-cut'-adjustment and use a zero clearance insert you will have less problems. I have done this and it seems to have solved the problem. I still cut small pieces with some treapadation but there have not been any significant explosions since.
As to wheather you can just lower the blade so the teeth are adjusted below the insert and not have any exploding pieces or if the combination of a zero insert and lowering the blade was the answer to the problem I was having.
Tim
« Last Edit: June 02, 2018, 01:30 PM by Tim Raleigh »

Offline Birdhunter

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  • Woodworker, Sportsman, Retired
Re: Kapex exploding beading issue
« Reply #5 on: June 02, 2018, 01:35 PM »
Are you holding the Kapex head fully down until the blade stops completely?
Birdhunter

Offline Brice Burrell

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Re: Kapex exploding beading issue
« Reply #6 on: June 02, 2018, 06:28 PM »
No, I don't believe a different blade will solve this problem. I do believe if you lower the blade as shown in this post by @jonny round boy kapex-'depth-of-cut'-adjustment and use a zero clearance insert you will have less problems. I have done this and it seems to have solved the problem. I still cut small pieces with some treapadation but there have not been any significant explosions since.
As to wheather you can just lower the blade so the teeth are adjusted below the insert and not have any exploding pieces or if the combination of a zero insert and lowering the blade was the answer to the problem I was having.
Tim

I just lowered the blade, and that helped immensely. A big thumbs up to JRB for the tip.
Check out my new blog, The Green and Dark Blue Blog.

Offline glass1

  • Posts: 387
Re: Kapex exploding beading issue
« Reply #7 on: June 02, 2018, 08:49 PM »
Kind of a known kapex issue.

Offline glynster

  • Posts: 9
Re: Kapex exploding beading issue
« Reply #8 on: June 05, 2018, 05:26 AM »
Peter's suggesting something like this.

Thanks gents, it never occurred to me that it might be that the work was not properly supported at the blade exit, I can see now that a sacrificial zero clearance fence could be what I am looking for - thanks for the pics that helps.
"I've always been a libertarian. Leave everybody alone. Let everybody else do what they want. Just stay out of everybody else's hair." Clint Eastwood

Online Peter Halle

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Re: Kapex exploding beading issue
« Reply #9 on: June 05, 2018, 06:59 AM »
Auxiliary fences can be plain or fancy.  There is one illustrated on page 23 of the supplemental manual for the Kapex.

A link to the manual:  https://www.festoolusa.com/-/media/tts/festool/festool-usa/downloads/manuals/kapex-ks120-supplemental-manual.pdf

Peter