Author Topic: Smooth on ratios  (Read 786 times)

Offline Crooked Stic

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Re: Smooth on ratios
« Reply #20 on: July 20, 2017, 07:51:00 PM »
There are a few bowyers that have done test strips with both mixes just to see
. the 2-1 mix showed tearing of wood and not peeling was much better. I think another key thing is letting the glue cure at room temp or at least not putting it in the hotbox too quick. So all the air has a chance to work out before curing starts.
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Online kennym

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Re: Smooth on ratios
« Reply #21 on: July 20, 2017, 08:01:00 PM »
One of the walk the talk bowyers told me he quit having problems with air bubbles when he went to the 2/1 mix. I haven't tried that mix but I may soon .
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Online Bvas

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Re: Smooth on ratios
« Reply #22 on: July 21, 2017, 07:37:00 AM »
If all the properties are better at 2:1...........then why do they even sell it at 1:1? Is the A side the more expensive part?
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Re: Smooth on ratios
« Reply #23 on: July 21, 2017, 08:13:00 AM »
Hummm... I like the sound of better peel resistance!! I'll give this a try on the next set of limbs I make for myself!!
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Online kennym

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Re: Smooth on ratios
« Reply #24 on: July 21, 2017, 12:34:00 PM »
The A costs a bit more, I'd have to check but seems like about 3 bucks a quart. I've wondered why 1/1 is sold if 2/1 works better also Brad..  maybe bow application isn't the big useage of it ?

Also wonder why not sold separate in pints , only think I can figure is most guys that build lots of bows buy quarts or bigger.?
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Offline Crooked Stic

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Re: Smooth on ratios
« Reply #25 on: July 21, 2017, 01:17:00 PM »
Ok I always use a bit more resin just because. Had very few problems. Those that did I have to say peeled pretty easy. I know a lot of the high end guys that go 1-1 and are happy with it. So I guess it is what you want to do. Piece of mind type of thing.
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Offline bamboo

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Re: Smooth on ratios
« Reply #26 on: July 21, 2017, 08:00:00 PM »
54* MORE temp protection is enough of a reason for me--the peel resistance is frosting on the cake

 its not any different that 1:1 in the handling dept--I just order 2 A's and mix accordingly---

I use a 24grit belt to clean up a blank--the hardened snots are noticeably tougher--

if its harder for me to peel using a putty knife--its harder for it to delaminate on its own
Mike

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Re: Smooth on ratios
« Reply #27 on: July 22, 2017, 04:25:00 PM »
I just glued up a limb for a TD, and went with 2/1.

See my gloom thread.....  :saywhat:
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Offline bamboo

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Re: Smooth on ratios
« Reply #28 on: July 23, 2017, 08:03:00 AM »
2-1 blew up --or the replacements are 2-1 ?
Mike

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Re: Smooth on ratios
« Reply #29 on: July 23, 2017, 10:28:00 AM »
1/1 blew up but I think I skimped too much on glue....
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Offline bamboo

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Re: Smooth on ratios
« Reply #30 on: July 23, 2017, 05:14:00 PM »
I glued one today--after your post--I poured the 2-1 right to it!
Mike

Offline Crooked Stic

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Re: Smooth on ratios
« Reply #31 on: July 24, 2017, 10:07:00 AM »
There is a suggestion section on the EA 40 web page that shows using a three step cure 2hrs. at 120-150-185. Then if you go 2-1 mix cure at room temp overnite the heat to 217 still under pressure. for those who use 2-1 mix do you do it that way?
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Offline bamboo

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Re: Smooth on ratios
« Reply #32 on: July 25, 2017, 06:23:00 AM »
my box ramps up very close to that schedule--

IMO 217* seems high for riser woods [very near boiling!]--- beneficial for the epoxy -but.......

that process might be good w/TD limbs --not as much wood to worry about---then use a gentler bake on riser wood
Mike

Offline T Folts

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Re: Smooth on ratios
« Reply #33 on: July 25, 2017, 07:23:00 AM »
I do the 2:1 ratio and still heat it. I heat to 165 +- for 4 hrs.
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Offline Crooked Stic

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Re: Smooth on ratios
« Reply #34 on: July 25, 2017, 08:31:00 AM »
Ok Kenny here is you some glue squeeze out.    :D
   
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Online kennym

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Re: Smooth on ratios
« Reply #35 on: July 25, 2017, 12:42:00 PM »
Waaay better'n this!!

 
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Offline T Folts

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Re: Smooth on ratios
« Reply #36 on: July 26, 2017, 07:27:00 AM »
I started with the 1:1 ratio and never had a failure. I always use extra with plenty of squeeze out. I have had a few limbs show spots of starvation but I believe it is related to dry spots so I am more careful now to get enough on and even spread. I have read a lot on the 1:1 ratio and 2:1 ratio and with suggestion from a (pro) after some proto type work of the two ratio's I was convinced the 2:1 is far superior for laminated bow limbs. The bow limbs were heated and pulled hot without failure, where the 1:1 ratio failed. Enough for me to be convinced. I work in a R&D environment and use a scale for everything, no guessing. I suggest you invest in a gram scale and measure for accuracy.
My .02
T
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Offline bigbob2

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Re: Smooth on ratios
« Reply #37 on: July 27, 2017, 09:21:00 PM »
I use the ratio as stated before for 4 lam longbow = 72 g Part A to 58 G part B, and have in hot bow at 160 C for 8 hours, then left to cool overnight. Works for me

Online kennym

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Re: Smooth on ratios
« Reply #38 on: July 27, 2017, 09:24:00 PM »
Quote
Originally posted by bigbob2:
I use the ratio as stated before for 4 lam longbow = 72 g Part A to 58 G part B, and have in hot bow at 160 C for 8 hours, then left to cool overnight. Works for me
Bob, that is 320F that's hot!!
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Online Roy from Pa

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Re: Smooth on ratios
« Reply #39 on: July 28, 2017, 04:37:00 PM »
Ya maken charcoal Bobby boy?   :)

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