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Author Topic: PowerLams. How do they work?  (Read 3818 times)

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Offline dragonman

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PowerLams. How do they work?
« on: November 21, 2009, 12:44:16 pm »
Does anyone out there in the bowmakers world have any close up pics of powerlams???  and maybe someone could explain exactly how they work. I would like to include one on a boo backed bow, my understanding is that they  cause more stress to be glued in next to the fades, when the backing is glued on, !  which, if that part of the limb  is made to do most of the work ( as in a holmguaard), then it should significantly speed up the  bow! but what is the best shape and height I dont know?
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'expansion and compression'.. the secret of life is to balance these two opposing forces.......

radius

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Re: PowerLams. How do they work?
« Reply #1 on: November 21, 2009, 01:06:02 pm »
search r/d buildalong by wytetail.  tells ya lots about exactly this topic.  Shows exactly how he makes one, what it's for, all that.

I think its purpose is to spread near-handle bending forces all across the back of the handle so that on one spot in a glued-on riser takes the brunt of the energy and becomes a weak spot.
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Offline dragonman

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Re: PowerLams. How do they work?
« Reply #2 on: November 21, 2009, 02:15:42 pm »
thanks  Radius, how do I find that build along? I put it into search, but nothing!!!
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'expansion and compression'.. the secret of life is to balance these two opposing forces.......

Offline zeNBowyer

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Re: PowerLams. How do they work?
« Reply #3 on: November 21, 2009, 02:25:49 pm »
The search  function  on  PA  unfortunately  doesn't  seem  to  work  very  well, 
you  can  however do  better by  using  another  search  engine,  just  include  "Primitive Archer"   in  your  search  and  you  can  still  search in  the  PA  database
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Offline dragonman

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Re: PowerLams. How do they work?
« Reply #4 on: November 21, 2009, 02:30:02 pm »
that dont appear to work either!!
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'expansion and compression'.. the secret of life is to balance these two opposing forces.......

Offline Cromm

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Re: PowerLams. How do they work?
« Reply #5 on: November 21, 2009, 02:35:39 pm »
I think this is what you are looking for.

http://www.primitivearcher.com/smf/index.php/topic,6916.0.html


Thanks for your time.
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radius

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Re: PowerLams. How do they work?
« Reply #6 on: November 21, 2009, 02:36:45 pm »
http://www.primitivearcher.com/smf/index.php/topic,6916.0.html

yeah i found it too!

wytetail just spelled  his name wrong, that's all!
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Offline dragonman

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Re: PowerLams. How do they work?
« Reply #7 on: November 21, 2009, 02:56:49 pm »
yeh, thats it, thanks for that,  there is some good info there, thats a help, I'm gonna study that!!
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'expansion and compression'.. the secret of life is to balance these two opposing forces.......

Offline Gordon

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Re: PowerLams. How do they work?
« Reply #8 on: November 22, 2009, 01:39:24 am »
The purpose of a powerlam is to stiffen up the handle/fades area so the handle doesn't pop off under strain.
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Gordon

Offline Tom Leemans

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Re: PowerLams. How do they work?
« Reply #9 on: November 25, 2009, 11:48:06 am »
Wow! I can't believe they cut individual grooves with a dremel! Somebody send them a toothing iron quick!
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