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Correct - the cycloidal drive is commonly used on the major axes - these are not backlash free but nearly so. Also reversible - friction critical - pumping in the wrong grease is the most common cause of failure. A demonstration GIF of a cycloidal gearbox :- I have never seen a harmonic drive...

O.K. The explanation as promised. The bearing at the business end is a flexible "wave generating" ball bearing from a harmonic drive - see video :- Disclaimer - I have no commercial interest in AG Harmonics but they have made a really good video explanation. The following is my own demo :- I...

You might win the pot of petunias award for lateral thinking - but no. I'm putting together a post to add here explaining where it all comes from - a commonly used device which for some strange reason is not very well known at all. Regards, Ken I

Stan, I'm glad someone has finally commented. Here's a slo-mo of the business end - note the stub ends of the levers are moving in and out twice per revolution (see gap between lever and clearance holes in the plate) Clue the low points are opposite the keyslot in the hub and the high points at...

I finally made a Boo-Boo with this motor - so just a heads up. Starting & Running The Motor: Firstly - Viewed from the flywheel side (left hand image on page 1) the flywheel turns AntiClockwise I have run this motor many times and many hours at shows but recently after nearly two years of...

I built the original as a proof of concept and to confound the curious :- I have exhibited this every year at our local modeling club as a curiosity. However it's always been pug-ugly and I figured I needed to tart it up some. Top Left - Beginning to look old. Top Right - I normally use an old...

I had to turn out 24 eccentric pins :- Tedious to clock each one in a 4 jaw, so I mounted my ER32 collet chuck in my 4-jaw for a "production Run :- Top Left - my ER32 on a home made adaptor flange - fits my lathe - extra holes adapt to my mill and dividing head. Mid-Left - the castellations...

I sometimes do a 1:1 print from AutoCad onto a self adhesive sheet and stick that onto the job (carefully) - helps avoid making any really gross errors. I also find my HP is more accurate than my marking out. Like the presentation base below :- Regards, Ken

I leave the block square and use a large enough 90° countersink as a milling cutter - dead easy - especially with Aluminium. Done it many times - but if yours is a bit large you can still do it in steps. Alternatively clamp the square bar the way you have it between "V" blocks (you'll probably...

Check if the motor rating plate is marked with duty cycle or rating Rating S1 is 100% duty cycle rated. Rating S2 is for Intermittent Duty - probably fine for home workshop lathe use - but keep an eye on temperature if run hard for more than 20 minutes. Rating S3 is for Light Duty - Limited run...

Same as ajoeam - plans ? I've been wanting to make a cannon for some time - your beautiful model fits the bill. Nice work. Regards, Ken

To quote the skeptical environmentalist Bjorn Lomborg - cats kill non-endangered species like sparrows, Jays etc. They do not kill large raptors (they actually kill cats) - wind turbines are a major threat to the larger and more endangered species. Large soaring raptors can be seen to...

Anday1 - see also my thread on the Stirling 60 + my revised drawings. Ted was a great help there as well. Jeroen Jonkman's Sterling 60 I agree with Ted, you can't just drill a hole and get the concentricity you need (see sub link "I Can't Drill Straight) There is a lot of information traded...

I gave up on using that idea or the indicator dial years ago simply because I've had the half nuts "ride" improperly closed and therefore out of pitch - it only has to happen once and your job is destroyed. I have had it happen on a number of different lathes including a wonderful Graziano but...

Foozer,If you are looking for the locus of motion - here it is - red dot on the pitch circle diameter so ignore the teeth and consider it two wheels running on each other (at their PCDs). A red dot indicates its position per tooth of rotation. It traces three epicyclic paths - demonstrating...

Willray - I see your point - and got confused all over again so I drew in the other positions (rotation degrees indicated are for the 20T planet wheel so rotating it 180° equates to 10 Teeth) :- As you can see at the North South East & West positions the datum tooth (now highlighted in red) is...

Well I was wrong and of course Marv was right but I had to draw it out to convince myself By rotating a 10T planet gear about a 60T sun gear (3:1) ratio in 180° (10 tooth) increments you can see that after being turned though 3 half turns the datum dot is now in its starting position and thus...

I haven't looked at anything and my answer is 4 - the smaller outer turns 3 revs against the inner but in so doing rotates an additional revolution. Kind of like the plot kicker in "Around The World In 80 Days" - Fogg thinks he has lost the bet as he has seen 80 sunsets - but that was in 79...

Ah K2, you've zoomed into my danger label - I censored it for the photo - given to me by an Australian friend "Not To Be Operated By F***wits." Hope no one is too offended by this. Here's another favorite Regards, Ken

Here's a model of an industrial "Clampex" coupling I made - mostly just to see if it would work :- It worked fine - nut was a prototype to test torque - came in at 7.5 ft.lbs. And how I used it to secure the flywheel on my beam engine (those are M2 Cap Head Screws) :- Has a nice industrial...