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This may be an old trick but its new to me. My hobby lathe does not have coolant and trying to dribble in HP cutting oil whilst parting off it tends to throw it out before it does anything useful. How to deliver coolant to the cutting edge ? Then it dawned on me to use a syringe :- Delivered...

A small amount of dead space also helps prevent hydraulic locking against condensate in the cylinder which can be very damaging. Regards, Ken

With model engineering, scaling issues come home to haunt you - especially flywheels. If you make a half scale engine model - the cubic capacity will be one eighth of the original but the flywheel's rotary inertia will be a sixteenth - see attached notes. The inertia is also a function of the...

I had a similar experience with a hand held air horn - the "air" is in fact butane. It ignited producing a big ugly yellow billow of flame - no harm done but nonetheless a surprise. Regards, Ken

Petertha, Just the mounting holes for the bearing block - details below. I built this 22 years ago with a 3kW motor goosed up to 15kW (by rewinding and running off 250Hz - I have posted on doing this elsewhere). Single Phase To Three Phase Rewind - Lathe Uprate Couldn't afford the mass of a...

Balls roll thus (animated GIF) This GIF assumes some axial load hence the balls are rotating crabwise between the actual points of contact. However there is a difference in velocity elsewhere up the grooves but the velocity difference is small and the wedging properties of the lubricant (film...

Hot is actually good - as explained to me by Cincinnatti - if the oil is being worked close to its maximum shear strength - thus supporting the bearing as near clearance free as possible - by wedging action (applies to ball bearings also) then the oil is going to get quite hot. Like I said in an...

Petertha, You are thinking of an electric motor which has a bearing at opposite ends of the shaft and typically uses a wave or waffle spring to allow for thermal expansion and contraction (shaft and or housing). In that application the bearing outer diameter is a slip fit in the housing and a...

Below a 15kW circular saw spindle I designed and built for sawing off aluminium casting sprues using a 150kg payload robot. Note the close proximity of the working end pair of angular contacts (I have switched off a lot of the detail layers as it gets far too busy) - the fit up of the assembly...

Just a further few cents worth - having had the experience of rebuilding Cincinnatti #2 & #3 Filmatic bearings (tilting shoes bearings based on Mitchell thrust bearings) as well as Jones & Shipman grinding spindles. As strange as it sounds - grinding spindles need to run with zero clearance...

My caution in post #7 "However clear decals in waterslide or vinyl do not work well on solid colours unless you first paint a white (or other light colour) as a background." You do get white background waterslide - but then you must cut them out accurately - alternatively paint a white...

There are many differing decal methods - see attached (my other hobby is slotcar racing hence lots of miniature decals). This is a low-res image. However clear decals in waterslide or vinyl do not work well on solid colours unless you first paint a white (or other light colour) as a...

Has anyone tried to wire cut the developed shape of a piston ring ? I am thinking of trying it so I'm just throwing this in to see if it is not just another barking mad idea by yours truly. Couldn't find much useful on the internet so I thought I'd just give it a whirl. Comments would be...

Now filed under completed projects :- Gearless Hypocycloid And a better video :- Music Credit Oxygene Part IV Jean-Michael Jarre (publishing requirement by YouTube). I have also filed the finished drawing there as well - unfortunately the build notes (MSword or PDF) are too large for the...

Finally finished and a better video :- Music Credit Oxygene Part IV Jean-Michael Jarre (publishing requirement by YouTube - damn they have smart software). Drawings attached. HYPO2.DWG = Acad10 file HYP2Model(1) = A0 Singles sheet print of the drawing (you have to print it big to get the...

The Finished Engine. Appearing with its geared cousin :- As a friend of mine pointed out the "gearless" is actually a 4 tooth (pinion ?) running in an 8 tooth anulus - just very strange looking gears. Some Possible Options / Changes / Improvements. I originally intended to make the pins as...

It's a trick you need to be careful with - it not only drills bigger but continues to drill bigger and bigger the deeper you go. Years ago I was production drilling Ø7mm holes prior to a 7mm hexagon wobbly broach - we needed to drill Ø7.05 - on one occasion we overdid it and by the end of the...

Right - I said I'd get it running over the weekend and I did :- The static photo shows it in the foreground my prior geared hypocycloid engine in the background. Running tight and sounding like a bucket of bolts (some of the noise is the compressor in the background). In the slow-mo of the...

Making The Baseplate. Nothing much to show here other than the circular (machine) polishing :- I used a machined wooden dowel faced with a 3mm thick leather pad – glued on with superglue. Choose a convenient size and pitch and work to a pattern. In this case Ø16 @ 9mm pitch (my minimill’s...

Making The Annulus Plate & Footplate. I had the blanks waterjet cut but under/over-sized where it counts. The Footplate is aluminium and the anulus plate stainless steel. Top Left :- 4-Jaw being used to align the parts for drilling & bolting. Top Right :- Clocking for the same values in X & Y...