EcoModder Forum Project Extended Pop-Top Aerodynamic Camper Shell ('99 Tacoma)

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 09-12-2012, 01:06 AM #21 (permalink) Aero Deshi     Join Date: Jan 2010 Location: Vero Beach, FL Posts: 1,065 MagMetalCivic - '04 Honda Civic Sedan EX Last 3: 34.25 mpg (US) Thanks: 430 Thanked 668 Times in 357 Posts Can you make it a "45°" thing and then sand it? Thusly?
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 09-12-2012, 01:11 AM #22 (permalink) Master EcoModder     Join Date: Aug 2012 Location: northwest of normal Posts: 25,881 Thanks: 7,291 Thanked 8,118 Times in 6,658 Posts Assume 1" material; then if the inner radius is 3" the outer radius is 4", difference in circumference is ~6 1/4". Around a 90° corner the difference is ~1 1/2", so 1.5 divided by the width of each cut gives you the number of cuts, spread across 1/4 of the inner circumference — 4 1/2". ...approximately. Last edited by freebeard; 09-12-2012 at 01:15 AM.. Reason: for completness
 09-12-2012, 12:19 PM #24 (permalink) B.O. Zen   Join Date: Feb 2009 Location: Folsom, CA Posts: 207 Pickup - '99 Toyota Tacoma 2wd, Regular Cab, Short Bed 90 day: 34.62 mpg (US) Thanks: 130 Thanked 136 Times in 58 Posts Ok, cool... I'll have to approx double the number of cuts I'm making, and go a little deeper to get to the 1/4" depth. I thought about going lengthwise, but decided it would probably be easier to go horizontally and blocksand along the length. We'll see... I don't have a tablesaw, so don't worry about the throatplate splitter. New stuff tonight, probably! __________________
 09-13-2012, 02:28 AM #25 (permalink) B.O. Zen   Join Date: Feb 2009 Location: Folsom, CA Posts: 207 Pickup - '99 Toyota Tacoma 2wd, Regular Cab, Short Bed 90 day: 34.62 mpg (US) Thanks: 130 Thanked 136 Times in 58 Posts Well, I had a couple more tries at getting the bend in the foam to work, but kept breaking it... might be cause I couldn't really cut clean grooves w/ the dremel. :/ Anyway, the new strategy will be laying the panels lengthwise, letting them overlap at the corners, and just sanding in the curve like Chaz suggests. No new pics today, but I put the rest of the bracing in between each x-section for the shell and should be ready to cut & screw on the top and side panels using the alternate method in the next couple of days. __________________
 09-14-2012, 10:32 AM #26 (permalink) EcoModding Apprentice     Join Date: Nov 2008 Location: Canada Posts: 133 2 x wrecked vx - '92 Honda Civic Vx Team Honda 90 day: 62 mpg (US) Thanks: 119 Thanked 54 Times in 30 Posts a8 Well I guess a tablesaw is better for the job of cutting the kerfs. If your going with Chazmt's method (and you may already know this) you can just cut the foam with a saw and then sneak up to your line with homemade sled like this and get a perfect angle. This is one for 90 degrees but with a simple spacer you can make any angle you want. Just in case someone is interested in what can be done if they have a tablesaw and at the risk of going too far on your thread I thought I would post a few more pics. 1" foam around a coffee mug ( 1 3/4" radius ) Throat plate splitter Last edited by turbothrush; 09-14-2012 at 10:55 AM.. Reason: more pics
 The Following 3 Users Say Thank You to turbothrush For This Useful Post: a8ksh4 (09-20-2012), ChazInMT (09-14-2012), HHOTDI (12-13-2012)
 09-14-2012, 12:47 PM #27 (permalink) B.O. Zen   Join Date: Feb 2009 Location: Folsom, CA Posts: 207 Pickup - '99 Toyota Tacoma 2wd, Regular Cab, Short Bed 90 day: 34.62 mpg (US) Thanks: 130 Thanked 136 Times in 58 Posts I cut the side panels for the shell last night. Started by tracing the top profile onto a side piece. Then offset the line down 1" so that I could lay the top panel over top of the side panels. Copied to other side: And then glued a second strip of foam along the top of each side panel so that I could sand far enough into them to get the curve I want. The pic isn't so good, but you can see the glue coming out along the curved top of each panel: I'm going to be out of town all weekend, so next update, attaching side panels and top, will be next Monday. Happy Friday! __________________
 The Following 3 Users Say Thank You to a8ksh4 For This Useful Post: ChazInMT (09-14-2012), slowmover (09-14-2012), turbothrush (09-14-2012)
 09-15-2012, 02:15 PM #28 (permalink) EcoModding Apprentice     Join Date: Nov 2008 Location: Canada Posts: 133 2 x wrecked vx - '92 Honda Civic Vx Team Honda 90 day: 62 mpg (US) Thanks: 119 Thanked 54 Times in 30 Posts Excellent. So essentially you will have 2" or so of foam but just where you are going to sand your radius right? Also it looks to me from the pics that you screwed the pieces together until the glue set. Is this the case? Thanks for posting Last edited by turbothrush; 09-15-2012 at 04:25 PM..
 09-15-2012, 03:44 PM #29 (permalink) Master EcoModder     Join Date: Aug 2012 Location: northwest of normal Posts: 25,881 Thanks: 7,291 Thanked 8,118 Times in 6,658 Posts With 2" of material you can only get ~1" radius without weakening the edge. But you could cut blocking out of you scrap and glue it on the inside and get whatever radius is required.
 09-19-2012, 03:39 AM #30 (permalink) B.O. Zen   Join Date: Feb 2009 Location: Folsom, CA Posts: 207 Pickup - '99 Toyota Tacoma 2wd, Regular Cab, Short Bed 90 day: 34.62 mpg (US) Thanks: 130 Thanked 136 Times in 58 Posts @ turbothrush - Yah, I cut two inch wide strips of foam to layer and back up the corner. I would lay glue in zig-zags where pieces of foam overlap and then screw them together to dry... This glue works pretty good... When joining the pieces, it's difficult to use enough screws to get a good seal, but if I go along w/ my hands and squeeze the glue out along the entire edge of both pieces, they don't separate afterwards. The glue joints also sand well once two pieces of foam board are joined together... When I sand across a glue joint, it tends to ball up before the pieces separate, so the joint stays steady and solid. Per freebeard, I may not have made the corner foam thick enough... I glued an extra layer of foam on yesterday to add some thicknessm, but I might still need to add some spray foam to the inside before I lay the inside layer of fiberglass. We'll see how rigid it feels after doing the outside layer. Sooo... good progress today! I cut notches in the x-sections to let me lay the sides in tight: Can see where the corners are going to need to be radiused from the cab to back: Both sides affixed w/ some screws: Sanding flush so that I can glue on a top layer of foam that will be cut through at the corners to make a smooth transition from top to sides and from cab on back... (LOL if this looks like crap when I go at it w/ sandpaper later this week...) Both sides sanded flush w/ the top profile so I can glue top panels on and then radius the top->side corners... tomorrow or later this week! the top surface is spherical... so I'm wondering how many pieces I'll need to get the foam to lay smoothly... Ideally, I'd use two pieces, joined along the middle from cab to tailgate. I think the foam has enough flex to do this. Soon we will know!!! __________________ Last edited by a8ksh4; 09-19-2012 at 03:57 AM..
 The Following 6 Users Say Thank You to a8ksh4 For This Useful Post: BamZipPow (09-02-2013), ChazInMT (09-19-2012), HHOTDI (12-13-2012), RandomFact314 (04-09-2013), slowmover (09-21-2012), turbothrush (09-19-2012)