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  #76 (permalink)  
Old 08-29-2019, 12:13 AM
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Well folks, I got my laser cut hinge components back today.
I have started assembling them, but first had to drill pivot holes out to size and tap a couple of threads to attach the coupling plates that coordinate the front and rear arms as they lift together.

I've spent many a hour on my sheet metal but a pic will not show where all my time has gone.
In saying that I have been bending and shaping these panels to tweak them in to a nicer fit and alignment.
Time, that I could never afford to pay somebody else to spend for me...
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  #77 (permalink)  
Old 09-03-2019, 12:07 AM
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Both hinges assembled and all is good.
Just getting ready to progress to attaching them to the firewall and work out how the hood underside will attach to my hinges.

Would have been a much easier job if there was no engine in place.
Something I will need to remember for any future projects.

I have also finalised the install and mounting of the body side hood latching...
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  #78 (permalink)  
Old 09-05-2019, 06:10 PM
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Hinges mounted and seem to have worked out OK for now.
I used insert nuts.
A added a small arm to my latch for easy operation.
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  #79 (permalink)  
Old 09-07-2019, 06:27 PM
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It is always good for the ego to share progress and success during a build as I have been doing during this hood project.
However, just when all the components are about to come together for the first time, I have just discovered that even with all my good intentions, that the hinges are letting me down.
In other words I have hit a speed bump in my progress.

I guess this has come about by trying to use a hinge design that was not actually made specifically for my project.
The issue which has come to light, but has been in the back of our minds is the need to achieve enough lift at the tail end or firewall end of the hood as it rises, so it does not bind or drag on the body during its movement.

Today, I did a mock up fit to track the movement of the hood as if it was being opened.
Unfortunately, the tail is binding as it rises out of the closed position and it will not work as planned.
It seems at first look, that I need to speed up the rear lift as well and gain a little more height.
I have trialled several improvements and arm positions and lengths to see if I can improve this situation.

During the initial CAD design work, we did improve the lift from 9mm to almost 15mm which obviously helped.
Tomorrow, I will visit the laser guy and see if we can impose some of my solution ideas into his CAD system and keep moving forward.
I am hoping to beat this issue, but do expect to have to lose something in the process, most likely it will be front lift height from what I can tell...
It is not only a question of lift, but a related rate of forward movement during the lift.

I am still trying to avoid tossing it all into the trash can, fingers crossed...
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  #80 (permalink)  
Old 09-07-2019, 08:38 PM
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Have you considered changing the angle where the hood and cowl meet. By raking the cowl angle back the requirements for the lift at the rear would change. It might be that you could do that and make it look like a custom touch and not a "work around solution."

You might also trim the corner of the hood and add a rolled out portion on the cowl to maintain the hood gap.

John
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Old 09-07-2019, 10:00 PM
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I'm not sure what you mean John by "racking the cowl angle back." I would say rotate the hinge forward at the top, this would raise the rear of the hood. You may be saying this and my brain just isn't working well.

That would go without saying with this move by the way, it is NOT working well.

Brian
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  #82 (permalink)  
Old 09-07-2019, 11:32 PM
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These hinges are a tricky concepts to get your head around, especially if they are something that you don't play with often.
I have come up with a couple of refinements that should inch me closer to a solution.
First has been to shorten my base bracket towards the firewall by 6mm, which still gives me some small clearance.
The second thought is to increase the length of the fish plate that can be seen in my last post of pic's.
The fish plate is the small horizontal plate about half way up the hinge with a small machine screw at each end.
We will try that with the laser guy on his CAD and see if the movement is improved.
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Old 09-08-2019, 11:00 AM
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But you could rotate the hinge and do the same thing. At the very least find out how much you need to modify it by simply moving it.

Brian
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  #84 (permalink)  
Old 09-08-2019, 05:29 PM
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Yes Brian, I have spent sitting and looking at the hinge when mounted and tried various modified arms to see how they influence the movement.
The number of times I have removed the unit from the firewall and then reattached I have lost count of.

Since my hinge design is already in the laser guys CAD system just going back and sitting with him and offering my feedback should help us both determine what will work best.

From the little that I know, the CAD system can show the radius movement with dotted lines of all the arms and by simple length adjustments of arms and pivot centers we should be able to determine what works best.

I am sure it will be some kind of trade off.

I have now implemented my first thought above and shortened the base bracket back 6mm towards the firewall which in my view will reduce the length of the tail which is binding as it lifts.
The shorter tail should go some way to making other adjustments possible and give us a little room to move.

I feel that I am close to a solution but need more skilled help.
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Old 09-08-2019, 10:34 PM
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I've visited the laser guy today and we had a play with the hinge and a sit down chat about how to improve my current situation.
He seems to think that my 2 ideas are workable and that the 6mm shortening will definitely help.
We have settled on looking at doubling the length of the fish plate, which seems at first look to satisfy the rear/tail end lift/clearance issues.
I left him looking for a solution to clawing back a lot of my front hood tilt which appears to have been lost with the other 2 improvements.
The hood tilt was at about 43 degrees and we are now down to about 20 degrees which is pretty bad.
I am hoping for 30 degrees or better, so fingers crossed again...
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  #86 (permalink)  
Old Today, 07:44 AM
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Sorry folks, I've been off the air here as I am still waiting for my laser guy and I have also updated to a newer computer.
Both results of actions are out of my control and I have spend a good number of hours trying to get my files etc into some sort of order.
I expect to get my laser cut parts by weeks end if the Gods are with me...
Boy that would be a first. hahhaha!!!
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