Joel's 1972 Land Cruiser Project

[frijolee]

I say give it a shot with the syringe.

Probably just getting paranoid about viscosities and what not since I only have one of each of these and no spares to try a test case. 

They do sell syringes made for epoxy
https://smile.amazon.com/807-12-Epoxy-Syringes-12-Bag/dp/B000208DZC

It looks like with the taper I can cut the end until I'm able to get OK flow.  Then drill a hole matching the tip 95% of the way through.  Pump in from 2 to 3 locations per delam.  Squeegee excess toward hole then clamp.

[wickedrx7]

Progress looks great!  I like the skid design for the tank.  I think you should make the tank firewall out of Titanium... Just because. 

I would think the problem with using a syringe is getting it to flow as most epoxies are pretty thick... I would almost wonder if super glue would work? Or could you thin out fiberglass resin and get that to flow in?

Edit - just saw the syringes for epoxies that you posted.  Those are typically used for woodworking and I have used the 207 epoxy resin and it is fairly thin but not sure if it would still flow as well as you would like.   How much "gap" is there and could you use something to carefully pry open to get the resin in? 

[frijolee]

Re: gaps.  Almost nothing, a few thou per layer but in some cases several layers splayed.  There's probably some grit from water jet embedded between layers as well.

[wickedrx7]

Re: gaps.  Almost nothing, a few thou per layer but in some cases several layers splayed.  There's probably some grit from water jet embedded between layers as well.

I wonder if it would be better to seal the back side and fill the hole with epoxy and work it into the layers. Once it’s worked in, remove the tape and clean everything up and lightly clamp.

[freeskier7791]

THANK YOU!

I need a pressure washer, so I much appreciate you pre-researching it for me.      Obsessed Garage is a great channel, too.   

This!!  I need to pressure wash the house soon, and I want to be able to clean my car easily.

[freeskier7791]

Joel,


That delam is very common with waterjets, as the initial pierce does not have somewhere to go until the carbon is cut all the way through.  I would use a resin or epoxy, SEM sells some nice stuff and then clamp.  You will probably have to redrill after its dry but that shouldnt make a difference.

[Cobranut]

Joel,


That delam is very common with waterjets, as the initial pierce does not have somewhere to go until the carbon is cut all the way through.  I would use a resin or epoxy, SEM sells some nice stuff and then clamp.  You will probably have to redrill after its dry but that shouldnt make a difference.

That makes sense.  I wonder if in the future you could pre-drill holes and program the water-jet to start the cuts in the holes.

[frijolee]

Thanks for the commentary gents.

I had also heard of delimination but I assumed it had more do do with poor laminates and this was pretty bad ass stuff (aerospace pre-preg) so I thought I'd be OK.  I was running out of time before the move so I kinda just got done what I could in the timing I could.

The problem with pre-drilling is that you still have to locate the drilled holes by hand and much of what I wanted was the location of the holes themselves.  If I had to do it over again I would track down a plotter, print what I needed full scale including pilot holes that the water jet could then align to.  It was clearly the piercing actions that caused the issues.  I don't know if we could hit it accurately enough to use an 1/8 pilot to be opened up to a 0.25" hole (using m6 fasteners) but it would be worth a shot.

[freeskier7791]

Thanks for the commentary gents.

I had also heard of delimination but I assumed it had more do do with poor laminates and this was pretty bad ass stuff (aerospace pre-preg) so I thought I'd be OK.  I was running out of time before the move so I kinda just got done what I could in the timing I could.

The problem with pre-drilling is that you still have to locate the drilled holes by hand and much of what I wanted was the location of the holes themselves.  If I had to do it over again I would track down a plotter, print what I needed full scale including pilot holes that the water jet could then align to.  It was clearly the piercing actions that caused the issues.  I don't know if we could hit it accurately enough to use an 1/8 pilot to be opened up to a 0.25" hole (using m6 fasteners) but it would be worth a shot.

I think you can also do a soft pierce to help with this but it can sometimes damage the appearance on the top layer and it makes a mess

[65imp]

I was thinking you may be better off just taping the undersides of the holes, then making a pool of epoxy in each one.  Then tape over the top and clamp down to eliminate the bulge.  As long as the epoxy does not get past your tape you wont seal the clamp to the part.  Later you go back and drill through the clear epoxy.  More work, but prolly gets the best fix.

[frijolee]

I was thinking you may be better off just taping the undersides of the holes, then making a pool of epoxy in each one.  Then tape over the top and clamp down to eliminate the bulge.  As long as the epoxy does not get past your tape you wont seal the clamp to the part.  Later you go back and drill through the clear epoxy.  More work, but prolly gets the best fix.

The piece I'm struggling with is how to drive the epoxy down deep into the delam, hence injecting from several edges toward the hole.  with a puddle in the middle I'm not sure how well I'd be able to work out the bubbles.  It almost makes me wonder if pulling vacuum from several edge holes and trying to draw resin in would be more effective.  That does involve gear I don't have though.

Unfortunately, I go ticketed for tires wider than fenders on my jeep so I'm having to pause and build some tube fenders I wasn't planning on.  Annoying since it's so obvious that the rule isn't enforced on "local" rigs.

[Cobranut]

Thanks for the commentary gents.

I had also heard of delimination but I assumed it had more do do with poor laminates and this was pretty bad ass stuff (aerospace pre-preg) so I thought I'd be OK.  I was running out of time before the move so I kinda just got done what I could in the timing I could.

The problem with pre-drilling is that you still have to locate the drilled holes by hand and much of what I wanted was the location of the holes themselves.  If I had to do it over again I would track down a plotter, print what I needed full scale including pilot holes that the water jet could then align to.  It was clearly the piercing actions that caused the issues.  I don't know if we could hit it accurately enough to use an 1/8 pilot to be opened up to a 0.25" hole (using m6 fasteners) but it would be worth a shot.

Even if the initial jet hit the edge of a small pilot hole, it might still give the water somewhere to go, and help prevent de-lamination.

[gc3]

bond in an anti-crush top hat spacer and stop worrying about it!

[markfluko]

I've been out of the loop for awhile. Is this thing in Hawaii yet?

edit: YES, page 29...

[frijolee]

Ha... Yes it is.

Unfortunately, the most recent work has been building tube fenders for my XJ.  I actually prefer that with cut fenders and tires hanging out.  It seems my local police department disagrees.   

I suppose building tube fenders is good practice for something I'll need to do for the FJ someday.  I've actually been contemplating lexan fender skins for round 2 on the Cruiser.  They'd probably cloud up with rocks and nicks but it could be interesting regardless.