Aluminium door hinges...price now added!
Turbo Mini Forums

oops

(didnt look in the second page) sorry lol

Edited by gregh55 on 22nd Jan, 2010.

Have you read the thread and looked at the pictures?

Nice one Chris, looking good!

Did you manage to have a look and see if the zinc coating on the clevis pins was enough to stop the Stainless and ally reacting?

Neil - CAD is the way forward!

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1/4mile in 13.2sec @ 111 terminal on 15psi

Edited by matty on 22nd Jan, 2010.

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1/4mile in 13.2sec @ 111 terminal on 15psi

i spoke to one of my directors and he said that nothing will react with the ally if we hard anodise them, which we planned to do

1972 998 TURBO SLEEPER

in case its of any use chaps ,

the tvr used ally hinges ,with a steel pin running directly in the ally hinge ,in time this siezes, and so revolves in its mounting in the steel cradle that bolts to the fibreglass car body .

to solve this , i drilled out the hinge to take a snug fit 8mm bolt ,which i then welded into the cradle top and bottom .
this has been used for 20 odd years like this ,and had never siezed or caused any problems ... thats running steel bolt directly in the ally hinge .

a couple of points that may be worth considering also are ,the force of the door as it hits the stop upon opening ,this would create a different type of pull on the hinge .

also the effect on the ally of fatigue and repetitive use .

Edited by robert on 22nd Jan, 2010.

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

thanks for your input Rob, i guess replacing the pin for a bolt reduced the contact surface area. ive been looking at the carbon weasels hinges and they use a traditional roll pin. this cant be good as i would of thought it would bind into the ally.
im going to look into the compatability of hard anodised ally and stainless steel.
at the end of the day these are intended for lightweight cars, that arent everyday drives. i guess you have to sometime sacrifice durability in the chance for weight loss.
We plan to get a prototype set produced ASAP

1972 998 TURBO SLEEPER

Do you think it would be possible to make these up in plastic, either injection moulded or machined? Would they be strong enough? I would have thought lighter and no galvanic corrosion.

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.

I find it funny that there is one guy constantly reading this: Ben Popham, one of the Carbon weezel guys :)

I guess its a good oppurtunity for them to do changes aswell though :)

I couldnt really comment Ben, i dont have any experienced with plastics. i would have thought that machined plastic wouldnt be strong enough and tooling costs would be far too high for moulding.

1972 998 TURBO SLEEPER

Hi this is Nick and not Ben.. just wanted to correct one thing posted here.. longy we dont use standard rollpins.. yuk.. if you check the info on our site you'll see that the pins are stainless steel.. we didnt want any binding or corroding or wearing.
It'll be interesting to see what sort of price you get quoted on these... seeing as your interpretion of the standard mini hinge is amazingly close to ours.. yeah it'll be interesting.. I know ours cost alot.. definately no mark up on the ones we sell with doors.. plus we supply carbon shims with them as well.

Custom 100% Carbon Fibre Products

CW/Ben, sorry if my comment came across as negative before, it wasnt meant that way. I just found it amusing:)

I have had quotes that have been high before aswell, so know they can be expensive, I am looking forward to getting a price on these.

Ah no worries... and we were a bit shocked how much they cost.. the prototype set made us gulp a bit even though they are a bit of aluminium art compared to the original clunky steel and rust items.. i guess they are probably quite a tricky/expensive thing to make if your not gearing up for thousands at a time.. plus theres not much room for them to be wrong seeing as minis dont have much room for adjustment on doors. We just figured they were a nice item to be able to offer to go with our doors.. didnt seem like much point in putting a kilo and a half of door on and then almost doubling the weight with its hinges!

Custom 100% Carbon Fibre Products

hmmm
plastic is a good idea actually i wonder if they could be made in acrylic. just the strengh of them would be an issue

Hi Nick, really sorry didnt realise they were stainless. my point exactly these are pointless unless everything else on the car is ultra lightweight. really love the set you've produce. at the moment this is more of an R&D exercise, of course depends on the machining cost whether they will be produced.

1972 998 TURBO SLEEPER

I can't see why machining a block of plastic will cost any more. Injection moulding in small numbers is not that expensive I don't think, but it is very small numbers.

I have to say that £250 with only a little markup seems really expensive. I am sure you are being honest, but a full gearset is not much more than that and that is a lot more machining.

To cut cost you could just supply them as solid parts and let the buyer do the lightening.

Edit: I am sure the doors on the racer will be fine with plastic hinges, there is nothing to them. In your stress model can you not just put in the properties of a plastic?

Edited by Ben H on 24th Jan, 2010.

http://www.twin-turbo.co.uk
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A man without a project is like a like a woman without a shopping list.

Agree about the R&D exercise longy.. and yeah definately pointless losing a few grams on a hinge if the doors are still a piece of Titanic.. we always wanted to have a go at making something nicer looking and lighter than those god awful original things.. plus they'll still go through race scrutineering and all that stuff.

Custom 100% Carbon Fibre Products

Ben H, your right i'll can just swap the material properties tomorrow

Nick you've definitely reached your goal and produced some beautiful and practical hinges.
If the quote comes back too high (expecting it too) the design will be simplified, but price is important and it might just not be realistic. There are no plans to market or mass this product, just produce enough for people on TM

1972 998 TURBO SLEEPER

What sort of figures are you suggesting. Machining is machining, so I guess you are talking about injection moulding. What costs have you experienced?

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.

Well hard tooling (metal moulds) tend to be for batches into 100,000's. Soft tooling (resin type moulds) iare a lot cheaper but your still looking at high production volumes to make it worth while. i wouldnt like to comment on price as it would be a guess.
A third option could be rapidprototyping, they've moved on a lot and components are now being produced with good mechanical properties. some of the F1 components are now manufactured using Selective Laser Sintering (SLS). SLS im imaging would is stupidly expensive, but Stereolithography seems to be more reasonable. there are several companies around that will produce prototype parts.

1972 998 TURBO SLEEPER

sounds good to me ill have a set at the right price

Matty
Commander
Rob
98turbomini25
5portsrock
miniminor63
Paul S
MarkGTT
apbellamy
minimadamotorman
Ben h
Jimster
Star Mag
Mickey.h
stefaz
munnracing
Si P
GraemeC
gregh55

I've taken myself of the list. Nothing to do with the hinges, just that my doors will be far too heavey for them. I'll have to make do drilling holes in the steel ones.

Matty
Commander
Rob
98turbomini25
5portsrock
miniminor63
Paul S
MarkGTT
minimadamotorman
Ben h
Jimster
Star Mag
Mickey.h
stefaz
munnracing
Si P
GraemeC
gregh55

im still waiting on a quote from the machinists

1972 998 TURBO SLEEPER

longy, might be worth dropping these guys an email, (http://www.robton.co.uk/), we use them a fair bit at work for making small to medium batches of odds and sods, always seem to be very keen on price, and fantastic quiality.......

drop them a email if you want a second quote......

Pete (QSE Metalblast is the company i work for - certainly wont do you any harm to mention that you got their details from me)

And on the 7th day........... God created turbochargers!