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| Heating blanket for repair - looking for tips http://www.luthiersforum.com/forum/viewtopic.php?f=10101&t=21212 |
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| Author: | Josh H [ Wed Feb 25, 2009 4:12 pm ] |
| Post subject: | Heating blanket for repair - looking for tips |
I recently received a mini heating blanket from John Hall for use in repair work (removing bridges, fretboard extensions, and so on). I’m new to using heating blankets and am looking for some tips. What sort of temp am I looking for when it comes to these kind of repairs? How long should the part heat up before going at it with the separation knife? I’ve done these kind of repairs without the blanket in the past and I’m hoping this makes things a lot easier. Any suggestions or things to watch for are appreciated. Thanks Josh |
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| Author: | Rod True [ Wed Feb 25, 2009 4:19 pm ] |
| Post subject: | Re: Heating blanket for repair - looking for tips |
Good to see you Josh. I hope your shop is full and you're super busy! If you start hearing cracking sounds, it's too hot  OK, seriously. Most glues will release at around 140*F so I wouldn't want to go any higher than say 160* just to be on the safe side. |
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| Author: | Michael Dale Payne [ Wed Feb 25, 2009 5:01 pm ] |
| Post subject: | Re: Heating blanket for repair - looking for tips |
a simple oven thermometer (the kind that has a flanged bottom stand will read the blanket temp. it takes about 90-120 seconds for a rosewood bridge to transmit the same temp to the glue. A little longer for ebony and I find that the glue needs about 30 seconds at temp to soften up good. I use one of Johns router controlers to control the voltage to the blanket. I always set it at variable and mid way and adjust till I am controling the blanket at 140F on a piece of scrap stock then move it in to position on the bridge. Wait 2 min. and test the joint with a seam knife. |
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| Author: | Josh H [ Thu Feb 26, 2009 10:55 am ] |
| Post subject: | Re: Heating blanket for repair - looking for tips |
Thanks Guys! That was the info I was looking for. Josh |
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| Author: | jordan aceto [ Thu Feb 26, 2009 7:28 pm ] |
| Post subject: | Re: Heating blanket for repair - looking for tips |
Something that i constantly do as i heat up something for disassembly, is feel the underside with my hand, meaning i reach in through the soundhole and feel the temp of the bridge plate and wood around the area, or the top and popsicle brace under the fingerboard. Warm to the touch is generally ok, and means that the glue is ready to release. If things start feeling hot, you run the risk of all of the glue joints releasing, like the center joint or adjacent braces. |
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| Author: | bluescreek [ Fri Feb 27, 2009 9:20 am ] |
| Post subject: | Re: Heating blanket for repair - looking for tips |
For bridges , it depends on the thickness and wood type. I use a very flexible pallet knife from an art store. You will know when it is hot enough when you can start the knife into the joint and feel the glue releasing. Be careful not to force things as you can lift grain and cause other damage. Patience is key john |
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| Author: | Pat Foster [ Fri Feb 27, 2009 11:11 am ] |
| Post subject: | Re: Heating blanket for repair - looking for tips |
Warming the pallete knife a bit beforehand helps too. Pat |
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