Recent content by Jasonb

I tend to use 648

nearer 500deg, see top of page 3 https://datasheets.tdx.henkel.com/LOCTITE-638-en_GL.pdf

Seems there are conflicting people said to have invented it, the model I linked to was 20years earlier than Harrison http://www.historyofrefrigeration.com/refrigeration-invention/jacob-perkins/

Here is a model of a 4cyl VW aero engine, the prop is probably 24"

The German model engineering magazine Mashinen im Modellbau recently had an article about a model of the one made by jacob Perkins in 1834 that stretched over 8 pages. You should be able to buy a digital back issue. I did not have plans but a lot of photos and some scematics magazine...

I would not fit them to the pistons until all the parts have been machined and assembled. Far easier to feel if there are any tight spots when there is no friction from the rings. They are something you usually fit at final assembly.

Looking good so far There are a few photos of one of the half scale ones mentioned above on the Davis site http://www.antiquengines.com/Dads_Scale_Models.htm If you go to their homepage and click the link to their Youtube channel you will find the video of the engine. Can't link to it here.

Pins are also used on a ported liner to stop it rotating, if it did then the ports could become blocked or at least reduced in area . It also saves people putting the liner back in the wrong way round! Steel is quite common for the liner or even the complete cylinder on model aero engines, you...

I've not looked at the video but if he is using insert tooling that all has a radius to the tip of the tool to some extent. If you were to drop that liner into a cylinder that had a square external corner then it would not seat down correctly. The groove give sclearance though the external...

Ground flat stock or Gauge plate. O1 to you.

That is why I made that one from drill rod and hardened it. But HSS can be cut with guess what? Yes Carbide. So the half round cut out can be done with a carbide milling cutter then the rest could be done on a grinder. You could also form the half round using something like a Dremel Cainsaw...

I use carbide most of the time but certainly would not say NEVER to HSS If you made a few more engines you would find there are times when HSS and even Drill rod and Ground flat stock have their uses particularly if you need a form tool or unusual profile. Here is one from GFS making some...

You could scale it up to say 7cc per cylinder quite easily without having to worry about making major design changes. As the capacity goes up by the cube of the scale you would only need make it 33% larger in each direction so bore would be in the region of 22.5 and the block around 33mm longer...

I thought they looked smaller so had a quick measure. On th eleft if we say the pistons are 17mm dia then the OD of the liner is likely to be 19mm the rest can be proportioned from that. which gives a radius of 0.8mm. could be 1mm radius at a push if you are mixing 2mm diameter which is 1mm...

It was not the round holes which as you say can be drilled out. It is the square internal corners in the top image and the deep internal small radius in the lower photo. Even with long neck micro dia cutters the radius x depth ratio in high. What is the radius and depth? If the radiu can be...