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| Side bending sandwich ? http://luthiersforum.com/forum/viewtopic.php?f=10101&t=28097 |
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| Author: | segovia [ Tue Jul 06, 2010 4:11 pm ] |
| Post subject: | Side bending sandwich ? |
Hi I have seen conflicting configurations of heating blankets and slats for bending sides. Such as slat - wood - blanket - slat slat - wood - slat - blanket slat - wood -slat - blanket - slat Which is correct, number three is out as I only have two slats J |
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| Author: | meddlingfool [ Tue Jul 06, 2010 4:24 pm ] |
| Post subject: | Re: Side bending sandwich ? |
I use number two, from the inside out. |
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| Author: | Jimmy Caldwell [ Tue Jul 06, 2010 5:03 pm ] |
| Post subject: | Re: Side bending sandwich ? |
#2 for me. |
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| Author: | Zach Ehley [ Tue Jul 06, 2010 6:05 pm ] |
| Post subject: | Re: Side bending sandwich ? |
blanket/slat/wood in paper/slat/blanket |
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| Author: | P@uL [ Tue Jul 06, 2010 8:13 pm ] |
| Post subject: | Re: Side bending sandwich ? |
Zach Ehley wrote: blanket/slat/wood in paper/slat/blanket another vote for #2. |
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| Author: | JRessler [ Tue Jul 06, 2010 8:57 pm ] |
| Post subject: | Re: Side bending sandwich ? |
I too use 3 slats Slat / Blanket / Slat / Wood / Slat |
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| Author: | peterm [ Wed Jul 07, 2010 2:11 am ] |
| Post subject: | Re: Side bending sandwich ? |
number 1 for me. |
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| Author: | Foster [ Wed Jul 07, 2010 7:47 am ] |
| Post subject: | Re: Side bending sandwich ? |
#1 |
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| Author: | JJ Donohue [ Wed Jul 07, 2010 8:17 am ] |
| Post subject: | Re: Side bending sandwich ? |
#2...but I also use 3 light bulbs to heat the opposite side. |
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| Author: | Fred Tellier [ Wed Jul 07, 2010 8:26 am ] |
| Post subject: | Re: Side bending sandwich ? |
I use #2 but add a strip of 6" aluminum flashing material to protect the blanket from abrasion caused by the ram and the spring loaded bending pieces. Fred |
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| Author: | bluescreek [ Wed Jul 07, 2010 9:04 am ] |
| Post subject: | Re: Side bending sandwich ? |
I use the steel wood steel blanket. I have yet to rub through a blanket. In most cases , as I bend about 250 sets a year , that is over 500 cycles and I use 2 benders . I have replaced 1 blanket that was about 4 years old and was my first prototype. I actually wore through the cord as that came off at the side of the blanket near the waist cawl. The 2 blankets I now use are about 3 years old and still work very well. Protherm is a true industrial product. We used their equipment when I worked as a machinist in a plastics extrusion division. The silicone took quite a beating and we have very few failures as compared to other heaters. That is why I use them. They are a bit more but they are a quality item. I agree there isn't a problem if you want to use the 3rd slat but it isn't needed . Still I know how some builders are , so I do think Alum flasing would be just fine for the top friction slat. john |
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| Author: | segovia [ Wed Jul 07, 2010 11:37 am ] |
| Post subject: | Re: Side bending sandwich ? |
HI all Thanks for your input, I'll try slat - wood - slat - blanket. The blanket instructions do say do not use in an open environment, resting on the top slat is rherfore not cosidered to be an open environment then ? John |
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| Author: | Christoph [ Wed Jul 07, 2010 3:20 pm ] |
| Post subject: | Re: Side bending sandwich ? |
spring steel/blanket/slat/wood in craft paper/slat/blanket/spring steel for me. |
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| Author: | Tim L [ Wed Jul 07, 2010 7:45 pm ] |
| Post subject: | Re: Side bending sandwich ? |
I'd really like to pick up another blanket and use the same method as Christoph. Most common method for me has been slat/wood/slat/blanket/slat until I lightly scortched a side of Koa on the outside surface and spent way too much time sanding. For the 2nd side I switched over to slat/blanket/slat/wood/slat to compensate for that problem and it worked fine. Tim |
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| Author: | bluescreek [ Wed Jul 07, 2010 7:50 pm ] |
| Post subject: | Re: Side bending sandwich ? |
putting the blanket under the slat is a good way to scortch . I place them on the top. The key is to use the blanket to heat the slat . Check out the bending video on youtube http://www.youtube.com/results?search_q ... ues+creek+ The one thing you will see that there are many ways to do this. Wood is an idiot and doesn't care how many blankets you use. In most cases , the people that need 2 blankets are using a 2 1/2 watt per inch blanket that cannot handle the thermal load. A 5 watt per inch is what you should use. It has enough power to handle the load. If you feel you need 2 blankets than use 2 but after 10 years of bending , I can do it fine with one. I bend 250 sets a year. A good process will give you repeatable results. |
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