Original Posted By: JRoss10612(at)aol.com
I know I've seen this one discussed before here....but how do I keepfrom glue my ribs into my jig...I have heard several solutionsinvolving wax-i.e. wax paper or candle wax, but I called the folks atGougeon Bros( I am using Wesy Systems) I was told ABSOLUTELY DO NOTUSE WAX OR WAX PAPER on the jig- that it would contaminate the epoxyand result in less than desirable strength....Anybody got any otherideas?Paris________________________________________________________________________________
Pietenpol-List: Frustration!
Pietenpol-List: Re: Frustration!
Original Posted By: Steve W
Paris:Consider polyurethane coating the jig. Also, you might drill 7/16" holesunderneath each joint in the jig. I have heard of using different types ofplastic sheet underneath the cap strips and diagonal joints, perhaps the thinstuff you find these days in supermarket bags. Mylar would be best, if you canget some. Used model airplane monokote scraps would work well, you might evenget it to iron down on the jig. Epoxy glue will not stick to most syntheticmaterials like mylar, however I suggest that you make tests first.Technically, the advice you received is correct. Glue tests have shown reducedstrength after contact with waxed paper, the T-88 floks will tell you the samething. The same goes for sanding & gluing. Old aircarft woodworkers used apiece of sharp glass to draw over each joint (thereby removing a fewthousanths of an ich of material) just prior to gluing.Another trick you can use to make wood wing rib jis is to use a large hardwooddowel approximately 1" to 1 1/2" in diameter, sliced in 1/4" thick wafers.Drill a hole off center about 1/4" in each disc, and screw it into the jigbase with a flathead srew and washer with the edge of the disc barely touchingthe capstrip or diagonal lines. The wafer will act as a cam, allowingadjustments to the jig that are very precise. I suggest that if you make a jiglike this you draw the oulintes of the parts on the jig first, coat with clearpolyurethane twice, sanding after the first coat. Then attach the discs asdescribed above. 7/16" holes drilled at each joint will facilitate rib removalfrom the jig.Hope this helps,Jon Ross - RV-8 builder________________________________________________________________________________
Paris:Consider polyurethane coating the jig. Also, you might drill 7/16" holesunderneath each joint in the jig. I have heard of using different types ofplastic sheet underneath the cap strips and diagonal joints, perhaps the thinstuff you find these days in supermarket bags. Mylar would be best, if you canget some. Used model airplane monokote scraps would work well, you might evenget it to iron down on the jig. Epoxy glue will not stick to most syntheticmaterials like mylar, however I suggest that you make tests first.Technically, the advice you received is correct. Glue tests have shown reducedstrength after contact with waxed paper, the T-88 floks will tell you the samething. The same goes for sanding & gluing. Old aircarft woodworkers used apiece of sharp glass to draw over each joint (thereby removing a fewthousanths of an ich of material) just prior to gluing.Another trick you can use to make wood wing rib jis is to use a large hardwooddowel approximately 1" to 1 1/2" in diameter, sliced in 1/4" thick wafers.Drill a hole off center about 1/4" in each disc, and screw it into the jigbase with a flathead srew and washer with the edge of the disc barely touchingthe capstrip or diagonal lines. The wafer will act as a cam, allowingadjustments to the jig that are very precise. I suggest that if you make a jiglike this you draw the oulintes of the parts on the jig first, coat with clearpolyurethane twice, sanding after the first coat. Then attach the discs asdescribed above. 7/16" holes drilled at each joint will facilitate rib removalfrom the jig.Hope this helps,Jon Ross - RV-8 builder________________________________________________________________________________
Pietenpol-List: Re: Frustration!
Original Posted By: "David B. Schober"
Paris- I used Saran wrap to keep the rib jig clean. MC________________________________________________________________________________
Paris- I used Saran wrap to keep the rib jig clean. MC________________________________________________________________________________
Pietenpol-List: Re: Frustration!
Original Posted By: "McNarry, John"
I used 10 mill clear Mylar and covered the entire fixture with it and thennail the stop blocks down.works great-->> I know I've seen this one discussed before here....but how do I keep>from glue my ribs into my jig...I have heard several solutions>involving wax-i.e. wax paper or candle wax, but I called the folks at>Gougeon Bros( I am using Wesy Systems) I was told ABSOLUTELY DO NOT>USE WAX OR WAX PAPER on the jig- that it would contaminate the epoxy>and result in less than desirable strength....Anybody got any other>ideas?>Paris>>________________________________________________________________________________
I used 10 mill clear Mylar and covered the entire fixture with it and thennail the stop blocks down.works great-->> I know I've seen this one discussed before here....but how do I keep>from glue my ribs into my jig...I have heard several solutions>involving wax-i.e. wax paper or candle wax, but I called the folks at>Gougeon Bros( I am using Wesy Systems) I was told ABSOLUTELY DO NOT>USE WAX OR WAX PAPER on the jig- that it would contaminate the epoxy>and result in less than desirable strength....Anybody got any other>ideas?>Paris>>________________________________________________________________________________