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If you do increase the thickness to 12mm then you would be well advised to consider using redwood rather than MDF. The finish would be vastly superior. Any decent wood-yard (not the 'sheds' - or even builders merchants) should be able to supply 12mm finished by 35 - 60mm wide stock (I don't...

If you do that, and maintain the 16/18mm measurements, then the minimum cove bit would be 20mm dia. - for a 10mm deep cut.

If you insist on doing it your way in spite of the excellent advice already given then it basically depends upon what YOU want to achieve. I have to presume that you want a smooth transition between the molded rail and the MDF so the minimum cove bit would be a 14mm dia (7mm radius) but other...

If the 'Nut' has finally been cut with a 'Plug' Tap and the 'Bolt' cut with a solid Die, then there is no chance that the thread will be 'riding on the peaks'. Starting with an under-size bar could increase the chance of cutting a 'drunken' thread higher and they are a nightmare! For external...

That really depends upon what you want the finished thread to look like. Personally I tend to prepare the OD with a tolerance of -0.0 +0.05 mm since this should always give me a full form thread. The most important dimension for any thread is the 'pitch' or 'effective' diameter which, in the...

I did think to chastise you -- until I saw that you need them 3" long :oops: I turn dowels at 1 and 2mm dia, but only 10 - 15mm long, on my Myford Super 7. Last year I needed some 3mm dowel in longer lengths - 80 to 150mm - and came up with an idea which you may have alluded to in your...

Last comment - Eggs are not Elliptical. 🤷‍♂️

Opinions can be wrong - facts can't. I don't have an opinion that an Ellipse is not an oval - it simply isn't - by definition, it's a FACT ! Incidentally,you still haven't provided a working link to the elliptical steel stock. I would like to update my knowledge.

You would be well within your rights so to do and you may wish to point them to the Oxford Dictionary definition which correctly makes no reference to a Mathematical/Conic section. As you can tell, I have a 'thing' about the Ellipse - it is 'special', just as the Reuleaux Polygons are.

It also says : " a plane curve should resemble the outline of an egg or an ellipse" which is inaccurate. -- It ought to say 'but not an Ellipse' ... and : " The term "ellipse" is often used interchangibly with oval, despite not being a precise synonym" .. which also has the word -...

I ought to have suggested that !! :mad: D'oh! Only problem is that the edges would not be perpendicular to the faces but that may not be a problem depending upon the specific application.

But what makes you think that elliptical bar stock would be available? Why not? The clue is in the name 'Oval' > Ovum / Ovalis / Ovary = Egg I suspect that most people who 'think' really do consider 'Oval' to be Egg-shaped. That doesn't mean that the myth should be accepted, perpetuated...

I have no idea how you came to think that there would be 'Oval' bar stock available. First 'Oval' means 'Egg shaped' (the radius at each end is different) and I suspect that what you really want is 'Elliptical' ie. the conic section. Steel Stock Holders / Rolling Mills have enough difficulty...

Maybe, if you want the lazy way of buying a ready-made lead with a 13amp plug on one end you may be right - I haven't looked too deeply but here are two sockets that you can wire up yourself in moments. 1 : 1679000 | ABL Sursum German Mains Sockets Type F - German Schuko, 16A, Cable Mount, 250 V...

I can't imagine why not but if you have a phobia then just [Google] the same thing. They are available from Amazon, RS, CPC, FS etc. --- just at a higher price :)

In that case you haven't found the right Engineering Plastic suppliers, try Direct Plastics | Engineering Plastics | Large Stocks In All Sizes or Cut to Size Acrylic (Perspex) Sheet, Tube & Rod - Simply Plastic both easily found 'Engineering Plastics' Suppliers.

It's not just volcanoes - the 'Clean Air Act' also has its part to play. Less air pollution = lighter clouds = more sunlight getting through !

I'm making the assumption that you have a metal working lathe and/or that you can hold a boring bar in a firm position and control its progress by machine dial rather than just by hand. Yes a 'Boring Bar' is probably what you called a 'side chisel'. Here's a photo of the 'business end' of three...

Acetal can't be polished to a clear finish. I'll concur with that on both counts !

No 'Shock Horror' as far as I'm concerned - most hard woods can be treated just like metal or industrial plastics - the biggest problem is getting mixed swarf. Separating wood-dust from brass/alum/steel swarf can be a real pain! I suspect that the initial "drilling with a 25mm flat bit" was a...