Tom --
I would expect a foundry to be talking about using an Al casting alloy
like A356. This one is used for many cylinder heads, etc. Handbook
says it is heat treatable to yield strengths like 30,000 psi.
Magnesium casting alloys (like used for FT200 gearbox case) can have
yield strength of 17-20,000 psi & are approx. 30% less stiff than Al
alloys.
On the other hand, my (admittedly old) engineering reference books
describe 3000 series aluminum (like 3003-H14) as wrought alloys
(mechanically formed to shapes like sheet, wire, tube, plate or
forgings). Generally the 3000 series alloys are considered hardenable
by cold-working not by heat-treatment.Thus, it seems unlikely a
company would propose to cast these kinds of 3000-series Al alloys.
Another thing to consider is that using an existing casting directly
as the pattern will result in a new cast part that is 2-3% smaller (in
every direction) due to shrinkage of the molten aluminum as it
solidifies and cools to room temperature. There are techniques (laser
scanning, etc) by which a digital model of an existing part can be
created, then corrected (in computer) for the shrinkage factor. Some
companies are then able to digitally "print" a set of bonded sand
molds (including cores for hollow areas).
Perhaps Ron Mong (Elite Fab & Machine, www.elitefab.com) still has
some of the casting patterns (or drawings of) that Jerry Mong used to
make the original cars. Bobsy Talk members might get a right-to-use
agreement on such intellectual property (if still available).
Lee Johnson (SR5-1)
On 11/28/18, Tom Quaranto <tquan277@xxxxxxxxx> wrote:
Gents=========Thanks for being a subscriber to Bobsy Talk email. Be sure to also
The other day I was able to locate and purchase an un machined #10 rear
uprite, thanks to Bob Alder. According to Don Anderson this uprite fits the
SR 5&6 chassis. The #10 mark is cast into the uprite so it is easily
identifiable.
Today I spoke with a foundry and I am considering having a few made using
the original blank I just purchased as master for the moulding process. The
purpose of this email is to gauge interest among the community for
purchasing spares which as you all know are unavailable.
The piece will have to be cast in aluminum as I am unable to locate a
foundry that casts in magnesium. The up side is the parts will be hardened
to T-6 spec (aircraft grade) utilizing 3000 series aluminum alloy. The down
side is an approximately 40% weight increase. Based upon quotes today I hope
to be able to offer the uprites for approximately $500.00 each in an un
machined state.
Please reply with any interest or comments. Thanks
Best Regards
Tom Quaranto
Chassis # 18
Sent from my iPhone
On Nov 19, 2018, at 6:34 PM, Don Anderson <donandersonracing@xxxxxxxxx>
wrote:
Frank,
I'm sure the cost could be lower, if amortized over several pairs. Since
the SR5 / 6 uprights are the same left and right, with brake caliper tabs
on the front and back, they all could be made the same. If you can get
combined order, and have one good upright to digitize, I would contact my
friend, who did mine:
Gary Hickman
Edge Engineering
https://www.edgecnc.com/
Gary can make anything.
https://www.edgecnc.com/our-work.html
He builds Formula 1000 cars, and makes EVERY piece, from the uprights,
stub axles, chassis, suspension, bodywork from scratch, etc.
Driving himself, he finished 2nd at the 2017 SCCA Runoffs, and won this
year in his own car.
https://www.scca.com/articles/2010606-rice-survives-formula-1000-chaos-for-maiden-win
Don
On Mon, Nov 19, 2018 at 3:19 PM fslejko@xxxxxxxxxxxx
<fslejko@xxxxxxxxxxxx> wrote:
Don, 2 pair? That comes to $1500 each. Not all that out of sight. If
there are 5 of us who would combine order it might become affordable.
Something to think about. I had mine welded but next season will tell if
they hold up.
All the Best,
Frank L. Slejko
303-877-5365
Sent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------
From: Don Anderson <donandersonracing@xxxxxxxxx>
Date: 11/19/18 3:48 PM (GMT-07:00)
To: BobsyTalk <bobsy_talk@xxxxxxxxxxxxx>
Subject: A Bobsy Talk Email: Re: Rear uprites
Tom,
Yes it was expensive, $6,000 to digitize and make 2 pairs.
But, it was my only option, if I wanted to get the car back together,
using the existing suspension parts.
There are numerous generic Formula and Sports Racer uprights available if
you're not staying original.
Don
On Mon, Nov 19, 2018, 2:35 PM Tom Quaranto <tquan277@xxxxxxxxx wrote:
Don
Those are beautiful bits. I talked with a local machinist who informed
me to digitize my uprites and carve them out of billet would be major
dollars! On the order of several thousand of them. He suggested
fabricating the uprites
using 6061 T6 plate 3/8” thick and thick tube stock for hub area. Weld
up in a jig then have the assembly cryo treated to reharden it back to
T6. I’m a pretty good tig welder but I thought if I could find a used
piece I’d be way ahead in the end.
Thanks for all the input gents! Glad to live in the states and don’t
have to deal with the FIA process.
Tom Quaranto
Chassis #18
Sent from my iPhone
On Nov 19, 2018, at 1:39 PM, Allan Bach Soerensen
<allanbachsoerensen@xxxxxxxxx> wrote:
One off 1959 Saxon-DKW with FIA ATP
So its possible
Den man. 19. nov. 2018 kl. 20.50 skrev Robert Alder<allan_junior_kbh.jpg>
<r.alder@xxxxxxxxxxxxx>:
On 11/19/2018 10:51 AM, Allan Bach Soerensen wrote:
Lets talk about FIA 😂😂😂🤣🤣🤣🤣😃
No, let's not. We yanks have it so good. My sympathies to you,
Allan,
having to put up with those guys. :-(
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