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| Bonding HDPE ? (Page 1/1) |
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MidEngineManiac
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JUN 08, 12:06 PM
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OK, wasnt counting on this, and I have never had any real luck with glues and HDPE....but for 20 bucks is worth a gamble.
Scored one of these this morning for $20. It's just a big blow-mold with a slip-cover. I need to mount a car-style seat slider to it. Just screwing it on will last all of 5 minutes in use.
Sooo...
I am thinking drill some holes and fill it with expanding foam, at least the seat section, which should stiffen it up a bit. Then find SOME way to glue/attach a chunk of 3/4 ply to the bottom and mount the tracks to that. Instead of the 4 point loads the weight gets spread over the entire seat bottom.
Right now the plan is to drill a ton of 1/4" holes in the bottom, then use Flex-Seal flex-glue to bond the ply on. The silicone will bond to the ply no problem, and SHOULD press through the 1/4 holes and form "rivets" to help hold it in place. Or maybe J-B Weld ?
I dunno, anybody ever had any success with HDPE bonding ?
Only other thing I can think of is a steel seat-pan on top, then through-bolt to that, but that idea starts to give padding and curvature problems.[This message has been edited by MidEngineManiac (edited 06-08-2023).]
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theogre
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JUN 08, 05:51 PM
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Your foam plan is likely Not going to work w/ 1 or 2 component foams and for mostly same problem... Almost Nothing sticks to the plastic w/o major problems. For Consumer use that's likely 99+% of stuff.
Is why many plastic "car" seats have some type of bolt anchors molded into them.
Plus trying to fill a space evenly is harder the you think...
Example: "1 can foam" often uses moisture to cure and doesn't like sealed spaces for this reason. It takes days or longer to cure and doesn't fill a space evenly even then.
If this is for a "Race car" then any mods is likely to Void any Cert's.
Even for driving on the street, is bad idea to mod a seat like you say above.
If you're heavy and weight more then the seat spec then your mod's won't help making it "stronger." Often the exact opposite happens as you made more stress points. Similar problem buying seats for home and office use by heavy people and never look at tag(s) on the bottom stating max weight for whatever then buyer claims falls apart or hurts them. ------------------
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)
The Ogre's Fiero Cave
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Jake_Dragon
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JUN 08, 06:47 PM
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you would be better off finding a real car seat and using it for what ever foolishness you are doing 
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MidEngineManiac
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JUN 08, 09:34 PM
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It's for the Kim-Kart  . I'm trying to shave off as much weight as I can for extra battery wiggle-room, (and performance ) This mod is 30-40 pounds alone if I can pull it off. The stock seat is better suited to a main battle tank the way it's built.
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Jake_Dragon
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JUN 09, 02:17 PM
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You could mount an office chair on a board and the sliders on the board.
The office chairs would be a little lighter.
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ray b
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JUN 09, 02:38 PM
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theogre
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JUN 11, 02:00 PM
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Problem is you often can't get industrial "glues" in small qualities even if some distributor sell that at all to the public. Plus that may need expensive tool(s) to apply too.
Example: Hilti "2 tube caulk gun" to apply some kinds of 2 part epoxy that cost well > $100 new.
Tubes are different diam and not easy to use it w/o the tool.
Many industrial "glues" etc are regulated by State or Fed and may not be allowed to sell to the public because using it may require HAZMAT handling... Like building or part of have correct air handling. Think like having lab chem hood but bigger scale. And/Or may need PPE to use it because of dangerous fumes.
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MidEngineManiac
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JUN 12, 03:04 AM
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Exactly.
Aircraft Spruce sells stuff that will do the job...at about $400 a quart.
For that I can just get a full-blown aluminum race seat.[This message has been edited by MidEngineManiac (edited 06-12-2023).]
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ray b
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JUN 12, 04:07 PM
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WELL MY TWO TUBE MIX GUN was about $25
the cartridges are about 20 for the better mix of epoxy with less filler
but to mix epoxy weight is better then guessing volume/size
or just use super glue quick no mix
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