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Here's something I posted a few years back on home gear-cutting. It covers generating your own profiles (using AutoCad or similar) and making your own cutters etc. etc. Regards, Ken

Welcome Mark - I too lurked for a long time - welcome to the forum and thanks for choosing my wobbler. Any issues feel free to ask and be sure to post a build thread. You might want to change the piston to 1/2" and the rod to 3/16" if you only have imperial reamers etc. etc. I normally just take...

Festo make small couplers (KD range) - the one in the video is a 5mm - they go down to 3mm. They auto close and I've never had a peep of trouble with them. I use the 5mm on all my models. In some cases I turn the male part when I want it integral to the motor (as in the case of my CIRCE engine)...

What's a wobbler. This is :- See plans etc. for this engine at the following post :- Magnetically Sprung Wobbler Regards, Ken

That looks like a combination of a fatigue fracture from too sharp a corner radius plus torque or flexing. Since you were only running trials - where did the stress originate - was it difficult to turn or is there a misalignment in the mains - such that you are running the crank "bent" - this...

For anyone interested - a link to a tutorial I did some time back on moulding using vacuum and pressure. Injection / Vacuum Moulding in Polyurethane When moulding silicone in aluminium moulds be sure you use the correct release agent - I have a mould with a permanently moulded silicone part...

I do the same as Paul for short parts or as long as my slide movement permits. Otherwise I guess it slightly long against a Vernier backing away from the chuck to take up backlash for the final adjustment (lock the saddle) - take a partial cut with the PO and measure. Dial in the necessary...

ajoeiam, you should try Russian equipment. During the cold war the Russians made everything to be compatible NATO to Russian but not vice versa - Russian 155mm shells are a bit bigger they won't fit in NATO guns but NATO ammunition works in a Russian gun. This paranoia was carried into...

kf2qd - you are right - under the metric system both ISO & DIN they decided not to reinvent the wheel and stuck with the existing BSP & BSPT typically designated like 1/4G in metric drawings - that's 1/4" BSP However some tables give metric dimensions and pitches which obviously gives weird...

I think the moderators are a very level headed bunch and will intervene if anyone oversteps the mark - normally a mild warning is all that is required. It is difficult when the "mark" is a very wide and fuzzy object - the mods do a great job. That said most members here are equally level headed...

We call it JK class - using sealed can rules - Hawk 7's - the dyno can test up to Group12 and Eurosport classes. Originally built for DC RC motors - it is no longer available. Regards, Ken

Here's a small inertial dyno for testing slotcar motors :- A flywheel (which has holes for photocell pickup - not visible in photo) is accelerated by the motor and the various parameters calculated and displayed vis :- FYI Regards, Ken

This started out as a worn out 5" cast iron castor wheel https://www.homemodelenginemachinist.com/threads/crankless-internal-rotating-cylinder-engine-circe.31900/ Regards, Ken

There's maybe 70-100 hours work in that engine - if that helps. I built a 12 Cylinder - see avatar. Six Shooter Elbow Engine (edit) On re-reading I see you are looking to sell - Unfortunately I don't think people are willing to pay the kind of money - given the engines available from Banggood...

Mike, I agree with Almega above - do the drilling and milling in one set up to ensure perpendicularity. I made my ends separately and soldered them on to tubes - I felt it was too long and spindly to machine from solid. It's do-able but you would probably have to turn it around and loose your...

Unusual result ? I suspect your (relatively) heavy copper connector was running interference. As far as I know you should connect both anode and cathode at the wide end to minimize this. The current needs to be high enough to induce bad plating at the narrow end. 1 A for what looks like about 2...

Pete, yes those "bobbles" are because of too high a current density - which is caused by the anode being too close (inverse square rule). This leads to preferential growth points where the point current density is higher - a vicious circle. The inverse square rule plays havoc when trying to get...

Pete, I clearly never thought it through - sumps and diff cover etc. would be a nightmare to machine from solid - by this method you can create parts that will confound most onlookers - go for it - add draw marks and wrinkles to your model. You can also scan and scale the real thing - lots of...

Now you can let your imagination run riot in 3D and translate it into reality. A very cool project in and of itself - thanks for the tutorial. Regards, Ken

Peter, Amongst other research while you are looking - look up "Hull Cell" This is a small glass plating bath with the anode and cathode at an angle to each other - giving a variable current density across its face. It is used to determine the optimum value for your solution - or to determine on...