Recent content by Andre Grobler

I have a thin 2mm knife in the kitchen with some pronounced flats and angles as a test blade, including asymmetrical grind for food release… the flats just stick to foodof the right size. Will convex the twobevels soon

Full flat grind on a blade as tall as a nakiri will suck ito food release, unless you have a fairly pronounced edge bevel… which sucks ito ease of cutting… so having the bevel somewhat convexed os useful for food release, however less expensive japanese knives probably have a somewhat hollow...

I am not talking big warps, fixed blade it will hardly be noticed, but folders… that is different

With all the straightness you folder folk require… i would make some stainless welding rod hooks or loops put that through the pivot hole, and grab those… no cooling rate changes, no warping to one side, if you want to quench with alu plates make it a hook that is easy to remove… get the tongs...

My disk sander only runs very slow, like 10% and it heats up a lot, i spray the casing with water to cool it down, will raise steam and once a sizzle, belt sanders mostly run at 20-70%, no noticible heat there, but they are horizontal, not vertical likedisk sander

Some you can adjust for less noise, at the expense of power control, might be the issue, but i don’t know enough

There are some 3phase motors that are not suitable for vfd,it hasto do with the grounding, which can spark arc throughthe bearings, damaging them over time. Not sure if this is a problem with current production motors, and could never find outhow totell

A few recents

A few more…

Andre Thorburn is one of my folder hero’s and he sits to grind, he does these wondrously elegant plunges… has a semicircle toolrest and table with a chair and good lighting. It takes a lot of practice getting used to a toolrest…

Very slick…

Lead with the heal in the initial bevel grinding, and go easier with it, as you go

I think, on the balance of probailities, looking at the steel, it is perfectly fine, and with a temperature controlled furnace, that is extremely unlikely to be a problem ever, unless the oven malfunctions drastically.

Why are you worried about overheating?

Well either deep freeze -20C or LN for -120C… yes, what Landes said made sense for cold treatments, you want to be going down or up in temp almost all the time. Except at lowest points, so that you convert retained austenite all the time, the temp must not sit still where ra can stabilise. So...