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| Bending Pattern Compensation http://w-ww.luthiersforum.com/forum/viewtopic.php?f=10101&t=17514 |
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| Author: | Bill Higgs [ Fri Jun 06, 2008 11:13 pm ] |
| Post subject: | Bending Pattern Compensation |
I am going to make a bending pattern (tenor ukulele) for a Fox style bending machine using a heating blanket. If I layer in this order: lower steel slat, wood, upper steel slat and then the heating blanket on top -----how much compensation (ie. - how much smaller) should I put into the bending pattern to get the best results? |
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| Author: | Hesh [ Fri Jun 06, 2008 11:26 pm ] |
| Post subject: | Re: Bending Pattern Compensation |
Mandodiddle welcome to the OLF! ![[:Y:]](./images/smilies/smiley20.gif "Thumbs Up") ![[clap]](./images/smilies/smiley32.gif "adulations") My stack looks like yours only with a third slat on top of the blanket. I don't use an bending form compensation and it works for me. I know though that some folks do compensate their forms for the wood and/or stack. I am sure they will weigh-in here and help you out. |
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| Author: | Brock Poling [ Fri Jun 06, 2008 11:41 pm ] |
| Post subject: | Re: Bending Pattern Compensation |
My bending molds are undersized by .100" all the way around. |
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| Author: | David R White [ Sat Jun 07, 2008 1:15 pm ] |
| Post subject: | Re: Bending Pattern Compensation |
I make the inside mold first, then use a router template guide to make the outside mold 1/8" larger, which compensates for the thickness of the side and slat. . |
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| Author: | Bill Higgs [ Sat Jun 07, 2008 5:55 pm ] |
| Post subject: | Re: Bending Pattern Compensation |
Thanks everybody. What a great place to exchange information. I think I'll try shrinking the pattern within the ranges you listed and see what happens. Again, thanks for your responses. Bill |
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| Author: | Parser [ Sun Jun 08, 2008 8:04 pm ] |
| Post subject: | Re: Bending Pattern Compensation |
Another thing to think about....some folks over bend the wood on the form so that you can take it right off the form and put it in a mold. Check out the Taylor Factory Friday videos...you can see that the edges of the forms are not vertical and that they are overbending at the ends at a minimum...and probably the waist as well. |
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| Author: | Michael Dale Payne [ Mon Jun 09, 2008 8:27 am ] |
| Post subject: | Re: Bending Pattern Compensation |
You answered your own question if think about it logically you said you would be using a slat/wood/slat/blanket. Every thing past the out side of the wood is inconsequential to the shape and size of the form Form compensation = Thickness of one slat and thickness of the wood. If this is the way you are going to lay out our sandwich. Personally I would not place my blanket outside for 2 reasons. Loss of heating efficiency and wear on the blanket from the press cauls. I would go slat/wood/blanket/slat or slat/wood/slat/blanket/slat. In any case if the wood is always the second component from the bottom of your sandwich the amount to compensate for would not change. |
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