Author Topic: bow form material  (Read 708 times)

Online bsv

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bow form material
« on: March 20, 2019, 11:37:41 AM »
is mdf okay for forms I have access to all thickness at work.. Thanks Burt
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Online Flem

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Re: bow form material
« Reply #1 on: March 20, 2019, 12:03:10 PM »
Mdf has real good compressive strength on its flat surface, not so much on the edge. I would guess if you used a stout piece of material on the assembled face, it would be OK. Hopefully somebody who uses a high pressure hose system will chime in.

Offline David Flanrey

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Re: bow form material
« Reply #2 on: March 20, 2019, 12:31:12 PM »
I use LVL and run it through a planer or drum sander to get the thickness I want.

Online bsv

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Re: bow form material
« Reply #3 on: March 20, 2019, 12:46:53 PM »
My plan is the topless method I saw on here in a video,Steel plates on the sides with steel pins and mule tape with pressure hose..formica on the top of the form.we have a laser at work to make the plates. Burt
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Online bsv

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Re: bow form material
« Reply #4 on: March 20, 2019, 12:52:07 PM »
when I think LVL I think I-beam shape,Can ya get LVL at home stores?
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Offline JWheel

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Re: bow form material
« Reply #5 on: March 20, 2019, 02:20:10 PM »
I've used 3/4" birch plywood glued n screwed together to make 1.5" thick....I think you may have problems getting formica to glue to the MDF surface.

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Re: bow form material
« Reply #6 on: March 20, 2019, 02:57:59 PM »
You are better of using LVL or 5 or 7 layer plywood. MDF not good with moisture. And I have seen pics of forms that broke under pressure.
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Online bsv

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Re: bow form material
« Reply #7 on: March 20, 2019, 03:26:52 PM »
Thank-you I have found 2x11x8ft LVL for $47 bucks  :goldtooth: :goldtooth:
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Online monterey

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Re: bow form material
« Reply #8 on: March 20, 2019, 03:40:55 PM »
Is the  LVL a true 2"?
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Re: bow form material
« Reply #9 on: March 20, 2019, 09:12:22 PM »
I wouldn’t trust mdf.
I use lvl and no complaints. I run it through the wide belt and get it down to desired thickness for both recurve and lb forms.
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Online skeaterbait

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Re: bow form material
« Reply #10 on: March 21, 2019, 06:23:02 AM »
What is the difference between LVL and just gluing plywood together? Aside from with LVL the factory gets to worry about straightness
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Online bsv

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Re: bow form material
« Reply #11 on: March 21, 2019, 07:35:38 AM »
It is not a true 2 inch but I will bring it down to 1.5 with Kennym"s method on his build-along
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Online Forwardhandle

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Re: bow form material
« Reply #12 on: March 21, 2019, 09:15:42 AM »
That LVL sounds interesting I been using deminsional maple for my topless forms 2 peaces plied together perfect 1 1/2 " and face the top with .040 glass I really like the topless form now I got all the bugs worked out !
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Online bsv

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Re: bow form material
« Reply #13 on: March 21, 2019, 10:01:11 AM »
this will be my first laminated bow but that style seems to fit me..
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Online jess stuart

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Re: bow form material
« Reply #14 on: March 21, 2019, 11:02:51 AM »
I have several MDF forms for takedowns, made a bunch of limbs on them without issue.  I do reinforce the form with 3/8" plywood.  MDF mills very easy but does have some drawbacks, heavy, doesn't do well if wet, soft and can chip easily
 I would not use it for a full length form  too heavy.  I think the LVL is the way to go, especially for a one piece form.

Offline Stagmitis

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Re: bow form material
« Reply #15 on: March 23, 2019, 04:47:40 PM »
Every form I have ever made from LVL has twisted/warped whether using heat strips or hot box. String alignment became impossible and I tossed quite a few bows in the garbage before I figured it out. Btw, this twist is difficult to detect.  I only use cabinet grade 3/4 plywood and have had no issues since.
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