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Messages - Charlie J
1
« on: August 19, 2023, 09:45:12 PM »
Hi Dom
Contact details for the guy who did my reline are as follows
Dave Baker
07463 550559
2
« on: December 18, 2022, 10:07:44 AM »
Done
Charlie
3
« on: February 28, 2022, 08:48:47 PM »
There is pictures of two flat tracker 550's with standard air boxes half way down this page >>http://www.sohc.co.uk/index.php/topic,24825.75.html
If you want to spend days trying to get your bike to run and spend £££ on jets for the carbs, work out why your pistons are burnt out and then still scratching your head why you have a flat spot. Then fit pods.
If you want a riders bike that starts easy, pulls well all the way through the rev range. Stick with a air box 
That's exactly it. I just want to keep the stock airbox. And if possible, not cut into the frame around the seating area. I'd like to use the stock seat pan and seat, and just shave it a little in size and get some nice leather on there. But I can't visualise it completely, and nobody seems to have done it. Or taken pictures of it at least.
I could of course be the first  But gonna start in photoshop first
I don’t know if this helps, but here are a couple of photos of my bike with the stock seat that has been shaved down and re-covered. The frame has not been cut and the airbox is retained. [ Guests cannot view attachments ] [ Guests cannot view attachments ]
4
« on: February 04, 2022, 08:20:33 PM »
Just found a great website that simulates riding positions for various bikes relative to rider height. Unfortunately, it doesn’t take girth into account !! https://cycle-ergo.com
5
« on: December 24, 2021, 10:50:33 AM »
Electric bike < 250 watts
Electric moped >250 watts < 4kw
Electric motorcycle > 4kw
With regard to electric scooters, it is illegal to use privately owned ones on the road. Hired ones can be used in the areas where the government has allowed trials to take place but are limited to 15.5 mph.
There is a teenage girl who lives near me who rides an electric scooter on the road and regularly passes me when I'm doing 30 mph! It may be illegal, but it looks great fun! I did far worse things when I was a teenager. Those were the days.
6
« on: December 14, 2021, 06:41:23 PM »
Now why didn’t I think of that 
7
« on: December 14, 2021, 03:43:44 PM »
It can get quite complex, even more so if you put rugosity (surface roughness) into the equation. But here’s a link to a useful guide and calculator from Caswell Plating that may be of help. https://caswellplating.com/surface.html
8
« on: December 14, 2021, 09:30:00 AM »
Rather than trying to visualise it. Try this exercise.
Take a steel cube 100mm x 100mm x 100mm and work out the surface are and volume.
Now slice the cube in half to give two pieces 100mm x 100mm x 50mm and now work out the total volume and surface area of the two pieces.
You will find that whilst the volume remains the same, the surface area will have increased by over 30%. So the displacement method for determining surface area isn’t remotely accurate even for non complex shapes.
I’ll let you do the actual maths which will clearly demonstrate the point
9
« on: December 14, 2021, 08:57:28 AM »
To give a simpler example and always remembering that Volume = Mass/Density
Take a ball of dough which will have a given mass and density and therefore volume. If you rolled it out as flat as you can it would still have the same mass, density and volume as the ball but a much larger surface area.
10
« on: December 14, 2021, 08:53:31 AM »
Modified the post to say 2mm to correct the 2cm typo. Unfortunately, not before you had read it.
11
« on: December 14, 2021, 08:39:02 AM »
Or, "The density of steel is in the range of 7.75 and 8.05 g/cm3 (7750 and 8050 kg/m3 or 0.280 and 0.291 lb/in3). The theoretical density of mild steel (low-carbon steel) is about 7.87 g/cm3 (0.284 lb/in3).
Density of carbon steels, alloy steels, tool steels and stainless steels are shown below in g/cm3, kg/m3 and lb/in3."
From this site https://amesweb.info/Materials/Density_of_Steel.aspx which would mean, if you weigh the components, each 7.87 gram would occupy a cubic centimeter, which gives the maths route to calculate total surface area for plating.
Which looks to me that you can reliably give a surface area for the components as mass of the low carbon steel is a constant.
Is that true ?
Unfortunately it's not that simple. Volume = mass/density. So two objects with the same mass and density will have the same volume. However, two objects with the same mass and density can have two completely different surface areas. For example, a cube of mild steel measuring 1cm x 1cm x1cm would indeed have a mass of 7.87 gm/cm3. However, if you hammered the cube into a plate say 2mm thick, it would have the same mass, the same density and therefore the same volume but a much larger surface area. Probably the simplest and cheapest means of determining the surface area of a complex shape is to cover the surface area with tin foil and then flatten out and measure the tinfoil.
12
« on: December 14, 2021, 12:03:38 AM »
I’m not sure that would work, as displacement is related to volume and not surface area. You could work out cubic centimetres by this method but not square centimetres. Two objects can have the same volume but different surface areas.
13
« on: December 13, 2021, 11:41:41 PM »
I have some experience of using 3D scanners for measuring surface area of aggregate particles in a laboratory. I know that 5 years ago you would have to pay at least £10k for one good enough to do what you are asking. I’m sure prices will be cheaper now but still a fairly heavy investment.
14
« on: December 05, 2021, 09:52:57 PM »
15
« on: December 05, 2021, 03:31:26 PM »
I obviously haven’t got the hang of posting photos yet! Photo 2 is “after” and the others are during the machining process.
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