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Hope to be down in Tassie next year, maybe I’ll see some skyrockets in flight😂😂😂😂

A piece of round silver steel is a good key. Drill into the shaft and tap the silver steel into it. I would do it between the 2 groves you have put in the shaft. Put a couple of o rings in the groves. On the pulley simply grab a square file or a small warding file on its edge and file the...

Found a few. I think these may help anyone that is interested In pulsejets. I believe these are free of copyright.

I will see if I can dig them up. Be a few days as I’m on a course atm

Steamchick : sorry I was just musing myself. To contain the heat and help your pressure waves you could use a ceremic coating( use the same on exhausts of cars) Thereby minimising heat losses in the equation. I have plans for about 20 or so pulsejets I have accrued over the years and have...

You could fit a sleeve around the unit and superheat water to drive a steam turbine. Cooling and circulating the water would be interesting

Pulse jets use pressure waves to run effectively, so divergent angles, lengths etc are reasonably critical. However most will run if made at least half decently. They won’t run efficiently or produce maximum thrust though.

Just a little info. The corner radius on a carbide insert is what you need to understand determines your minimum depth of cut and optimum feed per rev. The type of edge and clearance angles determine what it should cut like(in broad terms). The tool holder can be positive, negative or neutral so...

Shaun, I would have to disagree on this whole heartedl, at least in Australia. I have been a machinist for close on 50 years and in the last 15 to 20 years I can count on one hand the number of times I have used HSS at home or in a workshop. In CNC always carbide, in piece work lathes always...

Just get some carbide tips to suit plastic and aluminium mate, they are extremely sharp and cut aluminium and plastics like butter. Use them all the time.

A much better option is to put as long a rod in as you can. 2 to 1 rod length to stroke length is a good starter.

Has anyone looked at the offline cnc controllers on eBay, or have they used one?

Yes that would be correct in saying that. I don’t find it an issue and it is quite quick to do. The flip side is going from LibreCad to OpenScad. To generate a 150 PFC in OpenScad I do a dxf of its profile then import it into OpenScad with a linear_extrude function. Once you have a library of...

You are correct, that I do in LibreCad, both are free and the extra time required is similar to Any other cad program when producing production drawings. So the 3d is a concept drawing(with automation if required) and the dxf is the production or work floor plan drawings with tolerances etc...

This is a project I designed for a sawmill. Not the final draft btw. From this we created every part for Production. https://www.thingiverse.com/groups/openscad/forums/general/topic:49365 here is the code I use to export 3d to 2d from openscad. it requires you to pick each element to detail if...

For those interested in Dimension tolerances, it is quite easy in LibreCad to do. using the properties tool, just enter <> +/- 0.02mm into the box on the right hand side, or use one of the drop down boxes. The <> will add the actual dimension.

I use LibreCad for 2D and OpenScad for 3D, and I teach all my apprentice to use them As well. It’s very easy to draw 2D in LibreCad using the command line and OpenScad is Command driven. You can convert 2D drawings to 3D in OPENScad and you can convert 3D to 2D in OpenScad. As I have a...

Another issue we have had at work is Chinese steel having hard spots in it. You see them when you are machining and when drilling or milling. Mild steel and 1020 grades are the worst for it.

Speed should be 2/3 of your cutting speed, don’t go slow, it makes it worse! Check your chuck to ensure you have zero play in the job, you would be surprised as to how many lathes have small amounts of play in the head bearings and have bellmouth chuck jaws. Use a TDI to check, and put some...

Floppy drives can be replaced with USB/floppy converters. Did one for an old CNC at an engineering company 6 months ago. The cloud issue is a very big problem, too many people have data that just completely disappears or is hacked. And I’m not talking small companies as cloud service providers...