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Will your pushrods clear the heads of the new hold down bolts? Looks like you made the injector already, but I was going to suggest just rotating the hold down pattern 90 degrees and you'd be good to continue.

Nicely done on the dyno. I have way too many projects so this one will be somewhere at the lower end of the list but still interesting all the same. I've been bitten by the diesel engine bug recently and am working on a design (uniflow 2 stroke diesel of about 22cc). I'm not at the burnout...

It depends on you're design goals. From a fabrication simplicity point of view, copper is the winner. Easy formability, easy joining with silver soldered joints. And you could even nickel plate to conceal the copper colour. Biggest downside on copper is it will remain relatively soft and...

100% it can be the cutter. Ideal world yes the cutter is moving perpendicular to the work and should cut a parallel groove. Real world everything is made of rubber and the angle of the tool causes it to deflect as it engages the material. I can't tell you the number of times I've parted off a...

I recently somehow got an itch to design and build a 2 stroke uniflow diesel model so any model size diesel info is appreciated. I see Lloyd is looking into those too. Anyway carry on. Looking great so far.

That is quite the beast you're building. Looking good.

Here it is

I have the full model in a Fusion360 file (non-commercial) if that helps. I didn't draw it (can't remember who did - maybe snagged of the web?) but I'm pretty confident that it is correct where it matters. The file units are inches. If its of use I can see about loading it to the downloads...

Hobby grade rolled ball screws with preloaded ball nuts are very common today. Readily available (China origin) and relatively cheap. Look for DFU1605 for example (D for double nut, 16 for screw major diameter, 05 for 5mm screw pitch). The added friction is not important especially compared to...

I would argue that you'd have a near impossible time trying to build it and set it (calibrate) initially without a ring gauge. After that you can take direct readings based on the taper angle and the thread pitch chosen, within the tolerances of your construction. 45 degrees gets you 1:1 as...

I also forgot to mention you need to iterate a bunch of times either based on what is available or what you can afford, or what can physically fit or all of those. Just cause your calcs say you want it doesn't mean its readily available, or affordable or makes sense hanging off your machine...

Leveraging my expertise from converting one machine and updating another I can offer this advice: Simple method - copy someone else's "working" example of a configuration. 98% chance if it works for them it'll work for you and save lots of time figuring things out. Complicated method: 1. make...

That type of arrangement the set screws are what "preload" the large diameter thread to keep it from loosening off. So you should back the set screws off a bit, tighten the collar (probably by hand if its just retaining a seal - you don't want to crush the seal) and then tighten the set screws...

As to choose a name brand VFD or not - I've done a total of 3 so that is my level of experience. Some considerations I've taken into account on converting my machines: Name brand almost certainly has proper electrical / EMI certifications. ETL / CSA / UL / FCC / etc. These are important...

I also realized they have a standard for "sub miniature" boilers, and as I did not know where a sub miniature boiler ends and a "regular" (to me) boiler starts I did a search, and found this very helpful description on another forum...

I'm a bit surprised that 3 pages into the subject nobody has suggested the Australian Miniature Boiler Safety Committee's document for boilers, though it is quite well hidden on the internet and hard enough to find where to acquire it. AMBSC Code Part 1 - (various issues - Issue 8 - 2012 is the...

I did model up quite a bit of this engine, originally in Pro/E Wildfire 4.0 and later imported that into Fusion360, where I continued to model more of it. Its really in bad shape now due to many parts not being drawn natively in Fusion 360, and as an assembly it just misbehaves. I don't have...

If you do find a supply of castings I'd be interested in one more cylinder head. One of mine has a casting defect that only showed up when drilling the plug hole. I've patched it up but would rather have a "proper" casting. Sorry, can't help with drawings - I just have my set. BTW - this is...

It could just use a cleaning. If its been years since purchased the grease or whatever they added that they call grease could very well have solidified. Alternatively it could also be corrosion. Either way a quick disassembly, cleaning and inspection is in order. If nothing obvious, put it...

My take on this subject of copper boiler work hardening during pressure testing. I rewrote this several times as I worked through the math and my references. I will admit I had to rewrite my viewpoint a few times, as initially I jumped to the conclusion that the metal should not be yielding...