Member postings for Dave Smith 14

I use Morris's steam oil in my Super Simplex, available from Heritage Steam in either 1L or 5L containers.

As a professional user of Aluminium (40 years of aircraft structures) I stand by my opinion. The OP wants to make a seat base. It will be subject to loads from the occupant. Strength may not be issue, but is very low at 100 - 135 MPa (mild steel is around 240 MPa) but stiffness is going to be important and we talking about structure that needs to be SAFE. 1050 is extremely soft so yes suitable for things like foil, lables and custom dashboards but not where its operating environment will subject to any significant loads, which a person sitting on a bike can easily apply.

Bill I agree 5251 would also be a good candidate.

Also remember that with all Aluminium welding the HAZ at the joint unless heat treated will be in 'O' condition. So with say 6082-T6 with a tensile strength of around 295 MPa the strength at the joint will be in the order of 65 MPa and very soft, so stiffness can remain an issue.

Dave

1050 is no use for anything except foil and labels being pure Aluminium. 3103-H4 or similar is a better bet as it is weldable relatively easy to form and has a higher strength. 6082 can be used but you will need it in the fully soft T0 condition.

Paul..

Always happy to oblige with hornets nests. Thanks for the update.

Paul

Copy of the whole page. We will go with your version as it makes more sense at our scale. Also It does not matter to me as I only use it as a guide, although a very good one.

Paul I am very confused extract from my copy of issue 8 - 2012? This copy came from a fellow club member so I am not sure where he got it from.

Just looked at the current version of AMBSC, para 5.7 which states that a fusible plug SHALL be fitted and makes no concession for diameter, which means it is mandatory on all boilers. It also states the fusible material shall be commercially pure tin, I read this meaning solder with at least 99% tin (eg lead free solder) and leaded solder if you still have some not being allowed.

Birchwood Casey Aluminium black. £16.50 on Ebay.

Dave

+1 for run it up and down a bolt it will soon loose its grip. That is why repeated use of nylocs should be avoided.

Jerry

I live in Cowplain and am building my first 5" gauge loco a Don Young Aspinall. I have a Warco WM250V lathe and a. WM16 mill. If you want to pop round and see what I am doing pm me.

+ 1 for the Iwata Neo. A good easy to use brush that is not expensive. I spray enamels, acrylics and cellulose with mine quite happily. I use airbrush cleaner at the end of each session to clean out before taking it apart to final clean in an ultrasonic cleaner. It will spray large areas but it takes some time because the need as Jason says to maintain a wet edge. The 63" wingspan Hurricane in the photo was painted with it. Although the paint is semi matt.

I have both a Sievert and Oxy/Propane set ups. I tend to use the Oxy/Propane for most things as it brings things up temp very quickly and is very easy to manoeuvre around small objects. I use Hobbyweld oxygen bottles which are £33 for a refill (small bottle) and excluding doing a boiler lasts me about 9 months.

A std household vacuum cleaner will produce prodigious suction and can be used to create a vacuum. We used to use them at work to do deflection tests on aircraft structures due to suction at around 1.5 to 2.0 psi. You need to use the air bleed near the attachments mount to bleed air to prevent the part collapsing.

Some options:

Ruler, pencil, calculator and scale it.

Put the image into a 2D CAD programme, Adjust size to 1:1 or a convenient size. Set the graph datum at the CAD drawing datum and lay down a series of points at suitable positions on the graph. Interrogate points for values.

You can do the same in Excel using lines, it is a bit more fiddly but it works well.

Dave

I have been using WIN 10 for about 4 years now on a then new laptop using either Edge or Chrome for internet search's, Thunderbird for email and Bulldog for virus protection. I find It very stable and gives me no problems, so I do not know what all the anti 10's are complaining about. Also all file extension names are visible.

Josef

Yes it was the Italian paper.

Dave

Josef

Have you seen this paper on hirth couplings. If the link does not work send me a PM and I will send it to you.

Hirth Coupling Paper

Dave

Bought this off ebay 2 weeks ago good service, you need to add a regulator (I already had one), but significant cost saving over other outlets. Then bought additional nozzles and neck from Hamiltons.

Sievert Pro 86 Propane Gas Torch Kit 219742 | eBay

Dave

The gold coloured Chromic Acid processes are more commonly known as Alodine (USA) and Alocrom (UK). As Martin said these are also banned on the REACH list and ChrisB's company will be using them on waiver. We never used it on finished parts and stopped using it on bared edges and repairs about 6 years ago prior to the original REACH sunset dates replacing it with Surtec 650 Pens.

Cadnium plating has been banned by all the western Aircraft OEM's for new projects for about the last 15 years and ChrisB's company will only be able to use it via Grandfather clause on parts qualified using it. Although at present there is nothing that can touch it for corrosion protection of steel components on aircraft!

Until the advent of REACH there were two processes and three types of anodising used for Aluminium and its Alloys.

Sulphuric which be used to give either a very hard coating (hard anodised) or dyed to give colour and commonly known as sulphuric anodising. Sulphuric anodising you need to specify the coating thickness as the build up on the outside of the surface will effect close tolerance dimensions.

Chromic anodising gives either a clear or grey finish, but more important is the build up of the anodising on the outside of the surface is small enough that in most cases it does not have any effect on the part dimension. Chromic anodising gives better corrosion resistance at temps up to about 150 deg C. after that Sulphuric gives better protection. This is important in defining the best process with regards to protecting aircraft parts.

Chromic anodising is now banned under REACH, It is not the finished product that is dangerous only the process. Most Aerospace companies still have a waiver to use Chromic for now, , Sulphuric or modified sulphuric process are now being used or developed but when I retired three years ago they were not giving the same level of protection as Chromic. Boeing did some some tests about 10 years ago using purely sulphuric building 3 aircraft. They found after a years service the corrosion present was more than they would expect in three years of service using chromic.