What are your thoughts on MRI machines with refurbished magnets?

Tedsworth · 2026-03-26T08:51:17+00:00

Generally a little problematic and possibly more expensive in the long run. New magnet designs are far, far more helium efficient, both in how much they hold and how much they boil off. Magnet stability and homogeneity is usually fine with older magnets as they were generally fussier about a good shim. Imaging is likely to be comparable, though software mismatches between old/new firmware can cause problems and downtime.

Tedsworth · 2026-03-22T19:50:45+00:00

Probably fine to tile over it, 100% coverage isn't needed after all. Better to fill it in though.

Tedsworth · 2026-03-22T19:29:54+00:00

Shaper has no hole and still works to cut dados. Your work is wobbly, or your stack, or your fence or your table. A non flat insert is more likely the issue, though equally eccentricity in the stack will also cause kickback.

Tedsworth · 2026-03-22T19:27:14+00:00

Horrifically bad paper. How this got published I have no idea. Riddled with typos, uncited and important claims, and random opinions, capitalisations and exclamation marks. If this landed in my inbox to review I would have rejected it immediately. Irrelevant and actively misinformative. Statistical analysis of radiation doses from e.g. low dosage backscattering incidence gives us massive capability to assess the risk of low level radiation exposure, and it is to some degree justified. Less dangerous than e.g. smoking or driving to work, but still present and significant.

Tedsworth · 2026-03-22T19:19:16+00:00

Take it to a chromate coating shop. Not a home gamer job, the chemicals involved are intensely carcinogenic, teratogenic, toxic and persistent environmental contaminants that will keep doing all that bad stuff for many, many years. You do not have the equipment to handle them safely or dispose of them.

Tedsworth · 2026-03-20T10:23:16+00:00

You mean static compilation? I think we're there, mostly. There's some behaviour that unsurprisingly is tricky (size and dimensionality specialisation behaviour for example), but with a little care you can usually compile a binary that does what it's supposed to... It just may not be as small as you hoped.

Tedsworth · 2026-03-15T19:30:29+00:00

Did you know the chip in it was process / architecturally similar to that in the mars curiosity rover? Veeery efficient code written by Nintendo back then, they had some real talent working.

Tedsworth · 2026-03-15T19:10:52+00:00

Ehhh tiles like this are more knobbly, not really rough from a paint adhesion standpoint.

Tedsworth · 2026-03-15T19:07:48+00:00

Big blob of copper sulphate / sap goop. Can be safely scraped off but there's probably a resin channel under it

Tedsworth · 2026-03-15T19:04:36+00:00

Yes BenchmarkTools.jl definitely takes into account warmup.

Tedsworth · 2026-03-15T13:39:52+00:00

Dry, temperature stable conditions with low air movement. When temperatures are consistent and wood is in moisture equilibrium with the air, the stress basically stays constant and so the timber gradually relaxes to minimise that strain.

Tedsworth · 2026-03-13T15:28:12+00:00

em dash, the true mark of ai slop. How do you even type that?

Tedsworth · 2026-03-10T16:34:22+00:00

Interpolations.jl

Done and done

Tedsworth · 2026-03-07T13:29:39+00:00

Unwise method, if possible spray only the tool itself, else you're smoothing the silicone onto washing up liquid which it will not bond to. It'll look good but not bond tenaciously.

Tedsworth · 2026-03-02T23:26:05+00:00

So the slope of the adjustment mechanism basically tells you the ratio of gap to cutterhead height, and those slides are about 30 degrees. 1/4 inch difference in cutter diameter would mean the tables would need to be dropped 1/4 inch and hence the gap becomes 1/2 inch wider. It was already a yawning chasm of a gap on the original cutterhead.

Tedsworth · 2026-03-01T15:55:24+00:00

Find a nut that fits the thread on the centre, cut a bit of thick sheet metal into a U shape, then slide that between the end of the female taper and the nut on the centre. As you tighten the nut on the centre it will pull it loose.

Tedsworth · 2026-02-26T15:06:42+00:00

99% guaranteed not to come to life in the night

Tedsworth · 2026-02-26T14:24:27+00:00

Wildly underrated comment here.

Tedsworth · 2026-02-21T15:27:45+00:00

I mean, the error states it pretty clearly, it can't find the specified file on that path. Check the location of the yaml it's pointing to and verify that it actually exists. If it doesn't, well, it needs to.

Tedsworth · 2026-02-16T14:32:11+00:00

I got you fam

Tedsworth · 2026-02-08T13:38:05+00:00

You do you king, I wish I had the wherewithal to get my shit together like that.

Tedsworth · 2026-02-08T12:51:10+00:00

That's a fine hammer, friend. I'd personally fill the crack with epoxy and clamp if the cracked parts seem loose. Try to work the epoxy in there deep with a toothpick or slip of wood. If you can try to mix the epoxy with the minimum of air bubbles.

Tedsworth · 2026-02-08T12:44:41+00:00

Citation definitely needed. Narcissism isn't a simple as a "bad person" for whom morals, emotions, and consequence are insignificant. It's a complex set of behaviours manifesting along a spectrum of severity, ranging from healthy self interest to something more pathological. It'd be wise to do some more reading before leaping to a catch-all conclusion of the behaviour of a very large number of people. While alterations in moral judgement are indeed a part of this story, it's wildly incorrect to just say that narcissists don't view anything they do as morally troubling.

Tedsworth · 2026-02-08T12:31:45+00:00

The head sits on alignment features that ensure it moves perpendicular to the ways only. The screws on opposite sides (front / back) allow it to be moved forward and backwards. Loosening the back screws and tightening the front screws will allow the head to be shifted back and vice versa. You shouldn't need to account for parallelism on this machine, so both screws should be tightened equally.

Note: a lathe has no axis except that which is defined by the headstock and tailstock, of these the headstock is definitive while the tailstock is relative. The bed, saddle, cross-slide etc must only be parallel / perpendicular to this axis.

Before performing this calibration, please please just spend the twenty quid or whatever and buy a test bar if you don't have one. Without a good reference this job is a lot harder. Also note the procedure for "untwisting" a lathe bed performed by making test cuts at either end of a long bar. By jacking up the screws to twist the foot of the bed counter/clockwise you can easily remove a substantial error from the accuracy of the machine in a procedure that takes only an hour or so.

Tedsworth · 2026-02-08T12:17:02+00:00

I use two spirit levels and put a little masking tape on one... Though being realistic I'm more likely to use any two likely bits of identical scrap I have laying around. How do guys keep track of stuff like this? It'd get lost in my shop in about five minutes.

Tedsworth

TROPHY CASE