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Old 03-30-2016, 03:10 PM
skintkarter skintkarter is offline
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Default Wheelarch openings in buck

Looking for some advice please.

I'm not far off starting the buck for the Group 5 BMW bodykit, with the panels to be made in 1.2 or 1.6 5005 aluminium. The kit will closely follow the photo below of an original factory car.

A buddy has just about convinced me of using MDF for the contour stations, rather than the wireframe I had planned.

What I'm not sure about however, is the best way to form up the various large vent openings and the wheelarch openings. The original bodykits were glass (1970's) and the edges of the openings need to be rolled, rather than square returns or a wired edge.

Given that the vent openings (especially the radiator openings in the rear guards) look pretty floppy, I thought that I would probably need to make an alloy tube frame for the perimeter. This in turn would support a mesh insert which would help triangulate the hole.

Would you recommend incorporating a metal edge or laminated MDF edge for the apertures which could be used as a hammerform, or would you simply eyeball them and handform?

I guess that given that the car is going to be used in anger, that I may get the opportunity to make them more than once...

Thanks.

b4362.jpg

Progress shot of our car
20160312_140119.jpg
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Old 03-30-2016, 05:22 PM
AllyBill AllyBill is offline
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If the car is going to be used in anger l would make the kit up in glass and hang onto the molds.

Will
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Old 03-30-2016, 05:45 PM
Peter Tommasini Peter Tommasini is offline
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Richard ..
I would use a ally rod (not tube) to make the opening, and simply turn the ally panel around the opening (just like a wire rod just a bit ticker)
Peter
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Old 03-30-2016, 06:05 PM
Just Just is offline
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i use for such work --sikablock---- there is a wide range of model-bords and also tooling-bords with diff hardness, look if you can use this, it is perfekt for prototype-creations, easy to get in form with Hand or mill

http://prototypematerials.com/machin...styling-board/
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Old 03-30-2016, 09:39 PM
crystallographic crystallographic is offline
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Richard,
What do the wheelhouses look like, if any? You mention flexy and so thinking wheelhouse sections act as interior stiffeners ..... ?
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Old 03-31-2016, 12:29 AM
skintkarter skintkarter is offline
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Quote:
Originally Posted by AllyBill View Post
If the car is going to be used in anger l would make the kit up in glass and hang onto the molds.

Will
Thanks Will, but the idea is at least to make them in alloy first. I may be tempted to take some moulds from them, but am starting from a standard shell, so don't have anything at all currently..
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Old 03-31-2016, 12:33 AM
skintkarter skintkarter is offline
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Quote:
Originally Posted by Peter Tommasini View Post
Richard ..
I would use a ally rod (not tube) to make the opening, and simply turn the ally panel around the opening (just like a wire rod just a bit ticker)
Peter
Thanks Peter. Understand the thinking here, but was more wondering about creating a hard edge in the buck to start the process?
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Old 03-31-2016, 12:38 AM
skintkarter skintkarter is offline
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Quote:
Originally Posted by Just View Post
i use for such work --sikablock---- there is a wide range of model-bords and also tooling-bords with diff hardness, look if you can use this, it is perfekt for prototype-creations, easy to get in form with Hand or mill

http://prototypematerials.com/machin...styling-board/
Thanks Ernst, but thinking was more about making a station buck rather than a full panel model. Guess if I was going to make a glass or carbon part, then I would need to make a model. Really want to try and wheel these up in ali, so I guess the station buck is the best (and traditional) way to go.
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Old 03-31-2016, 12:40 AM
Peter Tommasini Peter Tommasini is offline
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Quote:
Originally Posted by skintkarter View Post
Thanks Peter. Understand the thinking here, but was more wondering about creating a hard edge in the buck to start the process?
Richard I usually started with a pair of pliers then finish off with hammer and dolly( the dolly is shaped like the turn over that I am after)
Peter
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Old 03-31-2016, 01:00 AM
skintkarter skintkarter is offline
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Quote:
Originally Posted by crystallographic View Post
Richard,
What do the wheelhouses look like, if any? You mention flexy and so thinking wheelhouse sections act as interior stiffeners ..... ?
Thanks Kent. Nothing at all in terms of a wheelhouse - they were just glass boxes, Dzus fastened into a vestigial remaining bit of factory coachwork. The rear guards house individual cooling radiators. On the factory cars they were dangled on support rods, with no connections to the outer guard. Don't think that the sill extension is of much help in terms of anti-flop at the front of the rear guard, hence thinking that a framed mesh insert would triangulate the radiator openings.

But was more head scratching re the buck question around the openings. Form something up to the finished shape, so that you could belt the ali around like a hammerform? Realise you could only take any return to 90 degrees, otherwise there will be tears in trying to lift it from the buck.

Looking at Berhard's Alfa buck recently posted, it would seems that the Gods don't bother in this area and simply freeform?

Photo 242.jpg bis.jpg
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Last edited by skintkarter; 03-31-2016 at 01:04 AM.
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