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Since I've started using a 5C collet block I make sure I leave a spigot on the top of the piston blanks when I machine them. Then I can hold the spigot in the collet block nice and securely while I machine the wrist pin hole and the rest of the internal features. Once it's done the spigot goes...

Whether you soft solder or not, it's a good idea to mark the orientation before you separate them so you end up with a truly 'matched set'.

I once did a job for an 84 year-old man that had been a carpenter for his entire working life and retired with all his fingers. During retirement he decided to build his dream home and did as much of the work himself that he could. When he was making the window frames he managed to cut off 1-1/2...

For the holes in the pads - I would expect they're a snug fit into the rod, which is hollow? So the holes are just to vent the air inside the rod so they (a) don't build up pressure when the pads are installed and (b) don't build up more pressure in a sealed volume as the engine heats up. For...

The pressure changes of the boiler will likely work harden the copper pretty quickly. I know soft water pipes in houses harden up rapidly.

Unfortunately, I have no idea how to restore a lost post. I have had the forum automatically save my reply as I'm typing (it just flashed up "draft saved" or something similar in the bottom right corner of the reply box as I typing) and I know this draft text still comes up even if I delete...

I've never had to do such calcs on a ring so can't help with any formulas but I can say you definitely can't apply the linear coefficient to things such as bore or OD and get correct expansion. The thermal coefficient relates to material expansion only and the 'void' of the bore or ID will not...

Honestly, looking at the drawing and the picture, I would have thought the shank of the tool would be inserted into the chuck and the flat on the end disk would be the centre height. I think that's why people were confused as the drawing shows the 'flat' in the end disk not on the centreline of...

Truthfully, I have no definite answer on either question as I don't know the copyright on either of them for sure. I think they're both in the public domain so it should be OK (with attribution) as they are certainly available quite freely. I doubt it would cause any issues so my guess would be...

Congrats on a runner, it's always a great feeling the first time they fire up. This forum is the place for your build log, feel free to just continue this thread if you like.

I've played with a Banggood engine that had one fitted. It ran without problems for over 8 hours (except for fuel stops) so I assume they're OK.

The Chuck Fellows method being talked about is the one I use for single cams and it's very easy and fast. For the flank radius, which is determined by the arc the boring head is describing, for smallish cams like these I just set it at around 2" and see how it looks. We're not after maximum...

Can you put something like a couple of dabs of grease or petroleum jelly in the groove so it holds the o-ring in place long enough to get the two halves together? Something like grease shouldn't affect the seal at all (which I'd be concerned about as well if you glued it with CA).

I agree it's not simple, but they're both gases so let's assume they are close enough to ideal gases for the ideal gas law to apply. Then PV = nRT and since you mentioned adiabatic and we have an unchanging mass of gas in the cylinder, then nRT is constant for a given intake of gas (let's use...

It's actually a little more complex than what you've explained above. For instance, adding salt to water increases the boiling point of the water. It's all to do with the bonding between the elements in the solution and just like the melting point (which is affected by the same factors) boiling...

This is true of the pure substance, but alloying can significantly change the boiling points of the constituents. I haven't been able to find any detail on whether the boiling point of cadmium increases or decreases when alloyed with silver. Weird things can happen when alloys are made, for...

I'm with Peter - I've never read anything that would provide a reason for why compressed air would expand less than steam, except the change of phase from liquid to gas of course. They are both gasses under pressure and should behave similarly.

Looks great. I'll be watching this one!

Guys - please post in English, even if it's just run through Google translate. Thanks.

Seems like they have an SSL issue so they are vulnerable to being 'hacked' but there is nothing actually malicious about the site. Should be quite safe to browse normally. You can check the report here : https://www.ssltrust.com.au/ssl-tools/website-security-check?domain=www.cromwell.co.uk