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Author Topic: KZ 750 Twin - Two point zero  (Read 50122 times)

Offline Hurco550

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Re: KZ 750 Twin - Two point zero
« Reply #180 on: Aug 30, 2016, 20:24:14 »
or foil or whatever the heck that stuff is
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Offline canyoncarver

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Re: KZ 750 Twin - Two point zero
« Reply #181 on: Sep 01, 2016, 12:29:03 »
Aluminum tape.  You're right Hurco... I just need to finish it.  I've been trying to get the wax on there so it will actually work as a release agent.   We just put a deposit down on a 12x20 shed for the back yard and that prep is keeping us busy at the moment. 
« Last Edit: Sep 06, 2016, 00:22:01 by canyoncarver »
--

YZF750/1000R The Fly
KZ 750 Twin
ZRX 1100
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65 Norton, My damn Shovelhead chop, and an 86' FXR
more YZF750R's, the KZ's, a Zephyr750...and the unfinished 75' CB550 cafe.
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Offline canyoncarver

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Re: KZ 750 Twin - Two point zero
« Reply #182 on: Sep 06, 2016, 21:12:45 »
I had a free day during the weekend so I got on the seat glass project.
I got two layers done and decided I could finish it better off the bike.  Let it set up about a day and a half
then I took my time and peeled the whole deal off the frame.  My "release agent" strategy worked really well. 
Oh....I'm never going to used chopped mat again, that stuff is awful once you go to brush the resin on,
stringy mess all over.  The woven mat was much easier.  There is still a ton to do, sanding and a few more layers
of mat and resin to beef it up.  It should be simpler now that it's off the bike and I can do other stuff with the frame as well.
Cheers.
« Last Edit: Sep 06, 2016, 21:40:35 by canyoncarver »
--

YZF750/1000R The Fly
KZ 750 Twin
ZRX 1100
KZ400 The Rabbit
65 Norton, My damn Shovelhead chop, and an 86' FXR
more YZF750R's, the KZ's, a Zephyr750...and the unfinished 75' CB550 cafe.
--

Offline irk miller

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Re: KZ 750 Twin - Two point zero
« Reply #183 on: Sep 06, 2016, 21:55:50 »
I'm never going to used chopped mat again, that stuff is awful once you go to brush the resin on,
stringy mess all over.  The woven mat was much easier.
  I'm pretty sure the woven cloth is stronger, too. 

Offline doc_rot

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Re: KZ 750 Twin - Two point zero
« Reply #184 on: Sep 06, 2016, 22:05:28 »
The only time i would use chopped mat is for the first layer on a gel coat mold so the pattern of a woven mat doesn't transfer into the gel.

Offline canyoncarver

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Re: KZ 750 Twin - Two point zero
« Reply #185 on: Sep 06, 2016, 22:10:27 »
An experiment but lesson learned!  Getting the resin/hardener ratio right was interesting.  I just eyeballed small quantities at a time.  It was outside on an 80 degree day.  It gave me about the expected 10-12 min working time.  I need more acetone around next time for cleanup too.
--

YZF750/1000R The Fly
KZ 750 Twin
ZRX 1100
KZ400 The Rabbit
65 Norton, My damn Shovelhead chop, and an 86' FXR
more YZF750R's, the KZ's, a Zephyr750...and the unfinished 75' CB550 cafe.
--

Offline Sonreir

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Re: KZ 750 Twin - Two point zero
« Reply #186 on: Sep 07, 2016, 11:15:24 »
  I'm pretty sure the woven cloth is stronger, too. 

But only in one direction.

Chopped mat is equally strong in all directions, though it is weaker than woven 'glass in it's stronger direction.

The mat is better for curved pieces whereas woven is better for flatter surfaces. Mat is also the correct choice when doing patch work.
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Offline Maritime

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Re: KZ 750 Twin - Two point zero
« Reply #187 on: Sep 07, 2016, 11:41:17 »
When using chopped mat the best method is to dab the resin on, then when you put the  woven down you can brush it out smooth.
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Offline advCo

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Re: KZ 750 Twin - Two point zero
« Reply #188 on: Sep 07, 2016, 12:00:32 »
I have built wood/fiberglass boats and worked with people in the composites industry, so i've had an inside look into this stuff. My buddy's last company built fiberglass and carbon parts for the America's Cup boats.

Chop mat is for fiberglass tubs. Woven mat is for calculated structural applications,(the same concepts apply for carbon fiber). Sonrier is correct about the strength in a single direction, but that is where planning your layers comes into play. You can use 4+ layers at 40*, 90*, and 120* from the original layer in order to resist deflection in multiple directions. The pro's have math and formulae they use to plan out the layout of the layers of glass, I personally just wing it and have been fine. The fenders on the 360 consist of 3 layers of woven 6oz mat at 0*, 45* and 90* and there is hardly any deflection in any direction even when torquing with your hands.

If you're going with a few layers of chop mat, it will work just fine.

Oh and try using a roller with chop mat
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Offline irk miller

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Re: KZ 750 Twin - Two point zero
« Reply #189 on: Sep 07, 2016, 12:23:07 »
But only in one direction.

Chopped mat is equally strong in all directions, though it is weaker than woven 'glass in it's stronger direction.

The mat is better for curved pieces whereas woven is better for flatter surfaces. Mat is also the correct choice when doing patch work.
I was talking per layer. And like adventurco points out, you alternate direction with layers.  The same goes for most structural applications of any grained material.  It's basic physics.  When layering wood for ply, you alternate direction of the grain for strength. 

As far as "correct", it also depends on what you're using as an epoxy.  Some wet better than others.