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In a recent hijack of a new member introduction (New from Atlanta Ga), there seemed to be some energy / interest in discussing matters related to welding. As one of the hijackers, I thought I'd repent and start this thread to relocate that discussion. One of the matters that has been raised is...

Actually, that title may be claiming too much. What I should say is, this is one of the more complex things that I have modeled in FreeCAD. The complexity here is not in terms of quantity of parts - any of the engines I have modeled have far more - but rather in the techniques that were needed...

I have recently acquired a "K40" style laser cutter / engraver. (More info below for those who are unfamiliar with this type of unit.) I have been thinking about using it to cut gaskets. I am confident it will cut the typical paper or cork gaskets; might cut rubber; I'm guessing it wouldn't cut...

I mentioned in another thread recently that I have been sidetracked yet again from one project into another. This time, I diverted from my ongoing foundry build for a relatively quick project, making a minimum-quantity-lubrication system of the sort patented under the Fog Buster name. Here is...

Here's one of the projects that has been diverting me from my half-built Modular Tower Engine - a slip roll, now completed. I made this to be able to handle up to 18" wide material. I'm not sure what the maximum thickness would be. As you can see in some of the pictures below, my first (and so...

Figured I'd jump on the bandwagon with the "Let talk about ..." threads. I realize there are approximately 14 million videos and endless discussions about how to build and different designs of the ubiquitous 2 x 72" belt grinder ... I know this, because I consulted nearly all of them as I was...

Attached are files to generate a fan that can be 3d printed without supports. As designed, the fan has a hub that extends further than the blades, with a groove in it; the idea is that the fan will be mounted on a shaft using flanged bearings, with an o-ring or similar belt to drive it: This...

Some of you live in places where the pandemic has largely been beaten back, so these files may not be of interest to you. Others of us are facing an ongoing challenge, so I am posting these files in case they will be of use. My wife asked me to work these up to replicate commercial products...

With some fear and trepidation, I am introducing a model engine that I have designed, and which I am about half-way through building. The fear, of course, is that I have no idea yet if it will work! Below are some CAD mockups of what it will look like. The first three provide different angles on...

I have recently acquired two full sets of gear cutters, M1 and M0.8 ... and I needed a better way to store them. A bit of work in OpenSCAD, and voila: The M1 cutters are 50mm diameter and 4.2mm thick; the M0.8 cutters are 40mm diameter and 4mm thick. In case anyone else would like to make...

Actually, the answer to the question in my topic title is, yes, there is an easier way, and that's actually how I started down this road. Let's say you want to design a cam with curved flanks, and you have the following parameters: the radius (or diameter) of the base circle; the radius (or...

Following the lead of Brian Rupnow and others, I decided to make an "ignition box" to hold a battery and automotive coil, with leads that can be hooked up run to an engine that has points and condensor ignition. What I came up with is a 3d printed box and lid: One side of the box has...

My very first IC engine (actually, first engine of any kind) - based on the Webster design, but modified to suit personal preferences and materials on hand. A major difference, as suggested by the title, is that it is made (almost) entirely of steel. The only exceptions are the piston (cast...

I'm building a Webster - .875" bore, 1.25" stroke. I was thinking I would make a carburetor along the lines of the one designed by Chuck Fellows, but I'm seeing a couple of variations, one with a 1/8" through hole and one slightly larger at 5/32". I have no idea what size of carburetor is...

Another design question: For an older car with points et al., I believe the gap is usually set to .016" - .020". Is this the right range for a model engine?

I am working on a modified version of the Webster - hopefully I will do a write up and pictures soon. But for the moment, I am pondering a question. Due to only having low-quality 1mm drill bits on hand, I was having trouble drilling the hole through the stem as per the original Webster design...

In preparation for and hopes of my first IC model engine build, I have been drawing up some plans in CAD for how I might customize a Webster - customizing partly to suit materials on hand, partly to use ball bearings on the crankshaft, cam gear, and big end of the rod, and partly to use 20°...

Newbie here, on the learning curve. My current questions are about selection of materials when making a bar-stock build. First, here is what I think I have gleaned from reading through a number of builds: Aluminum seems to be the material of choice for a large percentage of most bar-stock...