Member postings for Dougie Swan

Hi

Now that there are new publishers for the magazine do I need to renew my subscription details?

Dougie

Anyone any thoughts on why the square flanges haven't corroded?

Here are some pics of the damage, note the base flange which looks ok

Thanks everyone for the replies

Jelly, it was 98% acid that I have and used in the pickle, I won't use it again for any steei parts

One interesting thing is the flanges I soldered on were a different steel than the cylinders and they had little or no corrosion but they were not in contact with the stainless steel wire holding the cylinders

Thanks

Dougie

Thanks Fowlers Fury

We Don have hard water here in Scotland so not much carbonates in the water

I won't do it again but I just wondered if the combination of stainless steel, the cylinders, en1a and the copper created the perfect storm

Dougie

I've done overnight before but never seen this before

Dougie

Hi

I have just ruined 4 cylinders for my latest engine while pickling them and I am hoping someone on here can tell me what went wrong

I had to silver solder some base flanges to the cylinders, so far so good

I then pickled them to remove the flux ect

Now at this point I should say my pickle is 20-1 water sulphuric acid, it was previously used to clean my allchin boiler throughout it's construction and was a deep shade of blue

I hooked the cylinders up with stainless wire and dunked them in overnight when I went back the pickle was fizzing with copper particles floating on it

Removing the cylinders revealed the devastation, severe pitting and even large parts of the steel eaten away

A long time ago someone told me that steel in contact with copper would cause the steel to rot

Can anyone on here shed any light on this, was there enough copper dissolved in the pickle to cause either galvanitic or electrolytic dissolving of the steel

I have ordered some new steel and don't want to make the same mistake

Thanks

Dougie

Thanks for the replies

I have got some babbit, that's what made me think about the bearings, but I think I will probably stick with bronze

Dougie

Well that was eye opening

Thanks Michael

Hi

I am considering making the bearings for my latest engine from babbit

I am thinking of casting two half round and soldering them together for machining

My question is can I solder babbitt or is the melting point too close to the solder melting point

Thanks in advance

Dougie

So, this might be O T but I am building a Holt 75 and need to silver solder some square sections to the base of the cylinders, would en1a or en1apb be a good choice for the cylinder material

Dougie

What engine will that be Jason?

Dougie

Hi

Sorry for the late reply but thanks to all that replied

It really helped

Dougie

Hi

I am about to start my first turning job using a fixed steady, I've never used one before

My question is when I have turned the register and brind the steady wheels in to touch it how hard do they need to be pressed against the workpiece, just enough or really tight

Thanks in advance

Dougie

I have made a few engines with dummy magnetos which contain a magnet and hall sensor

This let's me make a scale sized and shaped unit that is driven by some small pitched chain

Dougie

Thanks for the replies

But I now have another question

When fixing the valve chest to the cylinder block what did you use for a sealant, I'm thinking of silicon, anybody got any suggestions

Thanks

Dougie

Thanks guys

Jason, your drawings have way more detail than my set

The view of the cylinder cross section doesn't appear anywhere on mine

Just like before you sent me details of the steering bracket that is missing from mine, who did your drawings

Thanks

Dougie

Calling all allchin builders

I have reached the stage of machining the valve chest on my engine and I have some questions I hope you can help with

On the drawings there are 5 holes drilled through the cylinder base into the bottom of the valve chest from underneath, what do these do

Same for the 3 5ba csk holes and one of the holes appears to be drilled through the valve stem but there is a lack of hidden view of the end elevation on my drawings

Any help will be greatly appreciated

Thanks

Dougie

Thanks Dave

That makes sense now

That helps a lot

Dougie

Thanks for the replies

Dave, can you send me pictures of the clamps?

Dougie