colterphoto1 Posted June 2, 2010 Share Posted June 2, 2010 Grille stretching jig, Heresy. See pages 3-4 for construction of. Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted June 2, 2010 Share Posted June 2, 2010 Grille stretching jig, Cornwall. Note how wingnuts have improved the original design, this is very helpful when trying to stretch the fabric taut and tightening the clamp to it single-handedly. Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted June 2, 2010 Share Posted June 2, 2010 MARK all your templates, so that you are certain you are using the correct piece. Motor boards and grille boards are of different dimensions and their cutouts are different. Or horror of horrors, that you should actually build a working loudspeaker of your template parts! [] Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted June 2, 2010 Share Posted June 2, 2010 Paint for backs, motor board face/edges, and grille boards. Note that it's latex so it cleans up easily. Likewise it doesn't make a particularly good paint for those pro cabinet, stick to oil based there guys. Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted June 2, 2010 Share Posted June 2, 2010 Marshall just uses the little short napped 1/2 rollers to roll on a couple coats of the black paint. Go ahead and coat both sides of the board so as to seal it from moisture, making sure to black out all the cutout edges. Here the guys are recoating a motor board but it's the same technique on the grille boards. Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted June 2, 2010 Share Posted June 2, 2010 When laying out and cutting the Heritage #17 fabric, you'll need 3/4- 1" overlap on each edge. We counted over 4 major rows of weave and cut at that point with sharp scissors. Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted June 2, 2010 Share Posted June 2, 2010 pulling taut in the long direction, slip one long edge of the grille fabric in the clamp (GOOD SIDE UP) and aligning with the weave. Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted June 2, 2010 Share Posted June 2, 2010 3 Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted June 2, 2010 Share Posted June 2, 2010 Still with the good side up, one of the stretcher frames is laid over edge of workbench, the other frame is stretched taut and clamped to workbench. Thus fabric is now pulled evenly taut in both directions firmly but the weave is not distorted in any way. That is the beauty of this system. Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted June 2, 2010 Share Posted June 2, 2010 Now that cloth is prepared and stretched, it's time to glue up our grille boards. 3M77 is basically contact cement in a sprayable form and works great for this application. Take to a remote location and spray the smooth side of the masonite grille board with an evey coating of 3M77. Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted June 2, 2010 Share Posted June 2, 2010 Surface should appear milky when enough is applied. This is contact type cement, so allow to tack up a full 5 minutes before applying grille material. Really, just don't be in a hurry about it or you'll have glue everywhere. Don't say I didn't warn ya! [] After this the panel is positioned on the workbench UNDER the stretched fabric. Center it top-to-bottom, and press fabric to the board. Remove from clamps and move to next grille board while that glue sets. Complete all the grilles that you wish to do up to this stage and let the glue set for a while before moving on to the next step. Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted June 2, 2010 Share Posted June 2, 2010 Bic lighter (long handled type preferred) to melt the loose fibres along all edges of grille cloth. Touching lightly with fingers (like singeing nylon cord) cures the fibres together, but DON"T BURN YOURSELF for Pete's sake. Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted June 2, 2010 Share Posted June 2, 2010 Trimming the corners at 45 degree angles, leaving 3/16" remaining along the cut line. This will make neater corners than overfolding mutiple layers of fabric which causes trouble with velcro attachment later. You want to end up with everything on the back side appearing neat and flush. Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted June 2, 2010 Share Posted June 2, 2010 corner cuts showing all-important 3/16 (grille board thickness) remaining along cut line Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted June 2, 2010 Share Posted June 2, 2010 2 Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted June 2, 2010 Share Posted June 2, 2010 trimming 1" chip brush to keep 'wild hairs' from getting contact cement on finished grille material. Note that we had previously used blue painter's tape to mask off approximately 3/4" of grille board, this is the area that we want the adhesive on. No reason for sloppy work now. Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted June 2, 2010 Share Posted June 2, 2010 another view of trimming the chip brush, basically just chamfering off about 1/4" on all four edges. Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted June 2, 2010 Share Posted June 2, 2010 For economy, Marshall buys the one gallon container, commonly about the cost of two quarts due to packaging. To reduce waste, pour into a smaller receptacle to work out of and keep your main container clean and sealed. For the Cornwall grilles, about 1/4" cup covered the rear edges of each grille board. Plus we were smoking cigars- you might want to exercise a bit of caution while smoking around solvents. I'm just saying...[8-|] Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted June 2, 2010 Share Posted June 2, 2010 Work fast, but you'll be able to lay down a nice thick bead before the rest dries. Look across the panel, the shiny bits are glued, the dull bits are not. Get it good and even. Brush a little across the 3/4" edge of the grille fabric also. Then what do we always do after we glue? we WAIT. Hardest part for me. [8o|] [O][:S][O][:^)] Ok, you can go ahead and take the blue tape off, then wait until neither side of the adhesive pulls away when lightly touched. Ready? Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted June 2, 2010 Share Posted June 2, 2010 Working quickly, tightly fold each grille fabric edge over and push down firmly. Do same for each of four edges. Quote Link to comment Share on other sites More sharing options...
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