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Messages - Seven racer

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16
Build journals / Re: 1936 Austin 7 twin cam racer
« on: 05 Apr 23, 08:10 pm »
Another small milestone today, the pedal box is now fitted,

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the dashboard fixed, and the wiring extended to the ignition switch,

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It's now back on its wheels, the back axle just needs keys dropping in, and hubs tightening up.

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I reckon it's about a day off trying to start, but sadly we are off to see children  and grand children for Easter.

Peter

17
Build journals / Re: 1936 Austin 7 twin cam racer
« on: 27 Mar 23, 07:23 pm »
A bit more slow progress on the cyclekart this week, though some progress is better than none.

Having put it back together after the brake pipe fiasco, the fuel tank has now been fixed,

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the screen and firewall have also been fitted,

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and the reverse gear lever is now cabled up and fixed.

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I have also made a start on getting the dashboard layout resolved, and some of the switchgear installed, so that the wiring can commence.

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So we are getting ever closer to starting the engine.

Peter


18
Where to get stuff / Re: Exhaust flange
« on: 27 Mar 23, 07:05 pm »
Me too for a tube please Stefan, (I bought a flange at the AGM), I will catch up with you at one of the events soon.

Peter

19
Build journals / Re: 1936 Austin 7 twin cam racer
« on: 18 Mar 23, 05:03 pm »
One step forward, fifteen back.
Who would have thought that fitting a brake line could cause such carnage, this time yesterday I had a cyclekart that looked the part at the front

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and had engine and transmission all lined up, and the brake calliper mounted at last

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so a simple job then, to run the brake pipe along the void in the chassis rail, to keep it out of the way, except it had to pass through the rear bulkhead, and the fittings were too big.  No problem, just that it meant I had to drop the engine out, take out the engine support, bulkhead, and half the cockpit, only to find that I had forgotten that there's a bolt running through the channel at that point.

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By this time the cyclekart was back to kit form

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Back to the drawing board to re-route the pipe. >:(

On a positive note the mini handbrake lever is now fitted, ready for connecting to a bicycle caliper acting on the main disc, to give a parking brake.

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Peter

20
Build journals / Re: 1936 Austin 7 twin cam racer
« on: 01 Mar 23, 10:57 pm »
A bit more progress today on the cyclekart, after a bit of a lull while the tail mould was being made,

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I've now got something a bit more comfortable to sit on,

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the front end is now pretty much finished,  just waiting for a new bolt for the spring hanger, as I bit the bullet and put a Pittman arm in, and I had a play with the pizza pan front brake drums and knock off wheel spinner. Hoping to get a couple of decent 3d prints run over the next day or so.

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Peter



21
Design Files / Re: Wheel Nut Spinners
« on: 23 Feb 23, 01:48 pm »
A week ago I knew nothing about 3d printers

Then our Men in Sheds shed had a printer donated,  which I borrowed to make some letters for a project.

For a long time I had been putting off sorting spinners for my cyclekart,  as they would require a lot of fabrication in aluminium,  then along you come with a fully sorted solution!

I now know enough to be able to mess with other people's designs,  so dropped the height a bit, as the seven ones are a bit thinner, and just ran a quick print off, (well as quick as 3d printing ever gets).

The result, brilliant,  thanks so much it's solved my problems, and certainty the front one fits perfectly.

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I'm now off to do the full 21 hour job, the intention is to do one for each side, smooth paint, and do some resin casts that I can adapt to suit, thanks very much for helping to tick something off the to do list. The chrome paint is also at least as good as the polished aluminium would have been, if not better.

Peter

22
Build journals / Re: Austin 7 Ulster - Build Journal
« on: 23 Feb 23, 01:11 pm »
Very nice, I am shamed by the 12 months from drawing to (almost) finished cyclekart. It looks great, can't wait to see it in the flesh.

Glad to see the Panhard rod on the front axle, it validates the thought process I had been having for the last month or so, that just bolting one end of the spring hanger up tight, simply wasn't right on mine. Back to the drawing board.

Peter

23
Tech Forum / Re: Glassfibre time
« on: 23 Feb 23, 01:03 pm »
Thanks Rhys, really useful,

I did start out thinking epoxy was the way to go, having seen Dennis Thomas use it on his tail sections, but then was beguiled by cheaper options. I should have learned by now that cheapest is not always best.

I certainly wouldn't want to kill any of our members, so it looks like epoxy it is, thank you for that.

It should come off the mould, but if not there are a couple of cut lines on the original that I could use to my advantage. I think I can actually dismantle the mould from the headrest end.

You mentioned that the cloth might be a bit light, the advantage, ihope, is that it should flex off the mould better? but my thought process was that it might need a frame support anyway, and that I could always reinforce from the inside.

The thicker the initial skin is, the further it gets away from the shape on the mould, but let's see how it goes. It's fully supported all around the cockpit end, and I was intending to frame the base, so the most likely area of wobble will be the top section, where I'm hoping there will be room to stiffen, or even foam fill it.

Thanks again for the guidance, 8 years laying up trumps a couple of hours on the nosecone!

Peter

24
Tech Forum / Glassfibre time
« on: 22 Feb 23, 08:35 pm »
Hi,
Looking for a bit of advice from the glassfibre experts. I did the nosecone for the seven with a buck/mould and polyester resin with a gel coat.

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This seems to have been reasonably successful,  so it's now time to sort the tail.  I'm not going down the mould route this time, as it's big, and I'm not likely to need a replacement, (I hope).

I have made a former 3mm undersized, with the intention of putting two or three layers of 200g woven fabric on, and fairing the surface. The question is what resin should I use, epoxy, polyester, or vinylester?

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Is there anything I have missed or got wrong? And any idea on resin quantities?

Peter

25
Tech Forum / Re: 3D printing and design.
« on: 20 Feb 23, 09:50 pm »
I think they are designed for schools, but the company that sells them offered it, along with some support to help us with dust extraction at the Shed. Hopefully it's bulletproof it will need to be!

Peter

26
Tech Forum / Re: 3D printing and design.
« on: 20 Feb 23, 08:33 pm »
This is useful, thanks Noel.

It just so happens that our Men in Sheds shed had a new printer donated at the weekend, so I am just starting to find my way in this new area of making things.

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Peter

27
Design Files / Re: Wheel Nut Spinners
« on: 20 Feb 23, 08:25 pm »
Hi Noel,

Mine taper very slightly from 44mm to 44.5mm.

The depth is around 4.5mm before it curves into the backplate. Total projection of the hub is 7mm, including the bottom radius where it curves into the backplate.

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Hope this helps, if you need anything further let me know.

I have mounted with that face pointing inwards, as I am fitting dummy brake drums, and the four bolt holes are ideal.

Wouldn't mind a copy of the stl  file though  :)

Peter

28
Build journals / Re: 1936 Austin 7 twin cam racer
« on: 23 Jan 23, 05:24 pm »
Well she's sitting on the ground,

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and I'm hoping to get the TAV lined up this week, so I thought I would make a start on the buck for the tail.

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Peter

29
Events / Re: Builders' Meet - 18th Jan
« on: 18 Jan 23, 11:13 pm »
Many thanks for organising this Stefan and Committee, - a very useful and interesting evening.

A couple of items from me that might be relevant,

The rear wheels I am using are ANF 125 clones, from Thailand I think, whether they are any good or not remains to be seen, but we'll find out at the first corner.
Bearings required were 37 x 25mm and proved a bit of a trial to source, I seem to recall, but otherwise they seem o.k.

https://www.ebay.co.uk/itm/115421011720?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=oKsplXggSZy&sssrc=2349624&ssuid=n3Xl8mAaSmy&var=&widget_ver=artemis&media=COPY

Fronts were from the same supplier 32x17mm bearings if I recall correctly,

https://www.ebay.co.uk/itm/115492114322?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=oKsplXggSZy&sssrc=2349624&ssuid=n3Xl8mAaSmy&var=&widget_ver=artemis&media=COPY

Around £50 per corner

With regards to the chassis discussion, while I am sure I could have learnt to weld, there are a couple of reasons I might have been interested in a ready built chassis.  Firstly I don't really have the time to start embarking on learning a new skill and buying kit that I might only use once. Then there's the cost of  a new welder, mask, goggles, gas, etc. never mind where to put it.

And finally there's the small matter of risking my neck in a set up I had welded!

In the end, I went down a different route, but from a speed of build, and cost point of view, it would have made good sense had it been available.

I did need some welding, but as Stefan pointed out, there are small fabricators who can help. I had aluminium axle ends TIG welded, a steel front beam axle and steering column welded, and plates laser cut for rear wheel adaptors for around £150, so it's relatively inexpensive.

Thanks again for a great evening, and a useful way for all the lone builders to exchange information and ideas, definitely one for a regular spot in the calendar.

Peter

30
Build journals / Re: 1936 Austin 7 twin cam racer
« on: 15 Jan 23, 07:40 pm »
Thanks Peter,
The most important bit will be to see if it works, but at least it's starting to get into final assembly, with all the niggly bits getting sorted as I go.
Still fighting the belt and chain alignment, but I'm now down to finding about 3mm, and I think I know what bits of the TAV to butcher to get it sorted, at least it's back on 4 wheels.

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Peter

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