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Damn it, I only fairly recently demolished the air raid shelter that is in my garden, I should have taken notice of a 1964 letter from the government to a previous homeowner prohibiting the demolition of air raid shelters.

Jason OK mine was a Noga which used a venturi system to draw and then mix/atomise the cutting fluid in the air stream. What fluid are you using in the video? I stand to be corrected if the type you show are not oppressive to use. I even had extraction on mine and it was nasty. B.

I have a mister unit on a CNC router and used it just once and natural common sense told me that the whole thing had risk surrounding it from both health and workshop cleanliness. Horrible device. B.

Jason That is a very good rounding up of the thread, thanks. B.

Terry This is quite misleading, pretty well any material that is heated to form it and then cools down to it's finished state will shrink. The point you make about having STL test pieces to check the machine and part kind of tell you that this is the case. Let's be clear PLA SHRINKS AFTER...

Jason we could do with one final statement on aluminium shrinkage, there is so much misleading numbers in this thread as to render it useless. The shrinkage is really the two figures that we talked about, my figure of 1/77th was on LM25 or L99 which is practically the same with L99 having less...

Don Green Twin did not print Polycast, that was me. So you are dealing with two shrinkages 1) The 3D print shrinkage, this is determined by printing simple test pieces and measuring those and applying that factor to any model that you create. 2) Then you have the aluminium shrinkage, there...

Hello Jason The front housing for that OS 60 is no longer available but we have a number of crankcases that we want to use in control line speed applications, I was going to machine some new ones from solid. However we have a bigger project to make crankcases for a 40 size pylon race engine...

Some good advise above but be careful to understand that you are not applying the solidification shrinkage to X.Y.Z dimensions, Jason and others explained this well. My 1/77 figure came from actual investment castings that we were doing in the foundry under the conditions that we were working...

1/77 shrinkage in most aluminium's, this figure from when I managed an aerospace foundry (Boeing and Airbus work mostly). Then you also have to work out the shrinkage of the 3D printed pattern and add the two together for an overall scaling factor for the 3D model.

Honda were playing around with a Hydrogen fuel car pilot programme in California about 10 to 12 years ago and their hope was that one day they would provide a home hydrogen generation plant as part of the vehicle package. I don't see any reason that this would not work given the will.

My guess is that the problems of deploying the charging infrastructure (from point of generation to power being pushed into the EV battery bank) will defeat the EV juggernaut. The reason that I think that Hydrogen will succeed is that there are multiple options to get the hydrogen into the car...

This is a good basis for a model sized outboard, it uses a conventional model aircraft/boat shaft valve engine. The power head base was all cast in a polyester fibreglass material with the flex drive up to the gear all embedded in the leg. I had one it was OK and a bit of fun. B.

Don't worry about EV's their batteries and charging infrastructure as it is just a temporary blip on the technology landscape. Read below...

Superb job and even sounds right when running.

I would give a resident customer QC person in a Chinese factory little chance of over ruling the Chinese production manager on any QC issue, the Chinese factory would rail road the QC guy and too much trouble and their visa would be withdrawn.

That statement needs a little bit of padding out, by far the most common form of 3D file transfer is the STP format, however some 3D CAD systems and Solidedge Community Edition (free download) are very smart and have feature recognition, which enables the STP file to be more than the dumb files...

I will follow your project closely, I am a massive fan of Honda as an engine manufacturer, no company in the World covers the breadth of production that Honda and to such a high level. Your GX160 model is a very fitting tribute to the small Honda engines. I know a little about the 250cc six...

Brilliant.

A very comprehensive and interesting report from Andy. I was very sceptical about 3D printers having seen some work and parts that were truly junk. Then I saw some guy printing carbon fibre filled PLA on Youtube using a Dremel printer, I thought the results looked good and bought a second hand...