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I used to ride a Suzuki 250 two stroke motorcycle. It ran on premixed fuel and oil. I think it was about 25:1. BP at the time, had a product straight out of the pump called BP Zoom. I don't think it performed very well but it saved the mixing in the tank routine. Then there are two stroke chain...

How then would you check the alignment of the HS and then proceed to correcting twist? ie how do you tell if the misalignment is from the headstock or a twist in the bed.

Yes I would agree that the setup shown would cut tapers. The one and only time that I have used RDM has been on a mini-lathe with a bolted on headstock. To correct the problem shown in your diagram I would have just turned the headstock until both the near end and far end were the same...

Rotate relative to the bed ways, was that yaw or roll? RDM does not require cutting a test bar. "RDM presumes lathe types where the headstock is integral with the ways; the spindle is bored at factory & essentially un-alterable?" I don't see this as a requirement. RDM does correct pitch...

Google Rollie's Dad's Method.

If you really want nuts to look authentic then look at the BA range. Unfortunately these are now being or have been phased out. The nice thing about BA is it scales up and down by a fixed fraction. That means a 0BA screw/nut will have the same look as a 2BA screw nut. I have seen charts that...

Delrin is advertised as a material to the hobby community. I've used it, but I've never really bothered to look closely at its properties. A quick google around tells me that it is Polyoxymethylene (POM) also called polyformaldehyde or acetal. Low moisture absorption is also listed as one of...

How about Delrin. This could be a trade name for more a more common plastic. It does machine easily though.

I went to the plans section and didn't see any plans for the sun-planet engine. Can anyone provide a link?

That's very useful information. I have never known the speed of the C1 minilathe or the X2 mill. Now I will be able to "calibrate the knob". Many thanks

I don't think the mechanism is nearly as precise or complex as you think. Take a single machine where the motor is on the machine and drives the drum. The drum has two flat belts which can be moved over to one of three positions. One of the belts is crossed over for reverse and drives a 'fast'...

I think Charles has summed it up well. ETW came in for some criticism about the connecting rod design and placement, he may have modified it from a master/slave design. The comment was on the modelenginenews website. I can't find it again. I didn't like the use of expensive and heavy castings...

I'll post some Inventor views which could help. In my previous answer I got the in and outs the wrong way round, I'll correct that here. This is a view of all three ports. The ports are oblong around the circle and have both inlet and exhaust in the same slot. This is a view with the rotary...

A while back I drew up plans in Autodesk inventor. Its a clever design. The steam or compressed air comes in via the centre rear port into the centre cavity of the orbital valve. As the valve rotates the cylinder inlet ports are uncovered and the steam is fed via these ports to the cylinder...