The Secret Society of Lathe Trolls

If you are doing a new front panel, I commend one of the dye printed ally services like for example https://www.meface.co.uk/analog-digital-modular-synthesizer-front-panels/ They do really quite nice stuff with full colour ink in the anodised panel style printing, and I am sure a 19 inch panel is wi...

Flo does his thing his way, and it works for him, I am not complaining (And I am about to send him money!). He clearly is not interested in being more then a very small company, and there is nothing at all wrong with that. Would it scale? Probably not, but there are enough of us out there who apprec...

No, but I was late with my request, so I may well have missed out.

Regards, Dan.

Transformer, but note that it is step-DOWN, not up! If you are running a Lyrec motor instead of the upgrade you will need to put it on a variable frequency drive as it will run slow at 50Hz, so a VFD feeding this is probably indicated unless it has a 50Hz option, not a big deal in the scale of thing...

probably going to be tricky to get the compliance identical for vertical and lateral motion with that, but worth a shot, maybe do something like install the damping between the front of the inner pole piece and the flexture that couples to the bridge assembly. I would note that the length of the cut...

It is one of the reasons I am never quite convinced by the open loop copies of the SX68 and friends that everyone builds, there surely has to be a better way of doing an open loop head that gets the damping closer to reasonable for that operating mode, damned if I can see what it should look like ho...

This is one of the major differences between an open loop (non feedback) head and a closed loop (feedback design). In the feedback head you design the thing to be very under damped (At least for most of the resonances) and then do the damping in the electronics, this improves the efficiency and lowe...

CBS had something as well didn't they as in house 'secret sauce'? As I recall it sucked like all the other similar attempts. IIRC there were a LOT of JAES papers discussing compensating playback tracing distortion in the 60s - 80s sort of time period, many of them collected in the (excellent) AES di...

Tip for the V spring, PCB manufacturers offer a laser cut and electropolished stainless steel 'stencil' intended for applying solder paste... If you draw the geometry you want on the paste layer of a PCB (Remember it is negative you get a hole where you draw the paste) you can get a great many 0.1mm...

Oh every company doing anything meaningful as new product has a pup or two, you don't win them all. Got to admit something that is so obviously flawed in concept making it out of Neumann is not what you would expect but 80s was peak vinyl 'loudness wars' and maybe they felt they had to in order to m...

Ah DMM, that makes some sense. Yea it basically amounts to a program responsive EE, trouble is the phase shift thru the thing must inevitably vary as the filter corner is moved up and down the band, which is likely audible. Today, if you were prepared to tolerate a DIGITAL version you could I think ...

I figured that the dynamically changing phase shift would likely be rather audible, it is usually the trap with that kind of thing, what I was wondering is if there was some secret sauce that made it a non problem, but it sounds like it probably did what you would expect. Waynes second order EE with...

It was a dynamically variable S component HPF which appears to have been designed as an alternative to an elliptical EQ right at the end of the original Vinyl era. Never actually seen one, much less heard the thing, but I did find a short form datasheet. Anyone know if it was actually any good, beca...

Ok, just wanted to make sure nothing had happened, this year being what it was.

Regards, Dan.

Has anyone heard from Flozki?
I tried to reach him last month about reserving a Caruso head and heard nothing either via PM or via email, hope everything is ok.

Regards, Dan.

Fitting a head with an advance ball might ameliorate that issue?

Still the SP10 is a better machine overall, and seems like an upgrade you would probably want to do before the feedback head dance.

I think you have just reinvented the cylindrical grinder, very cool.
Be careful about clean up, grinding dust is evil and if it gets into the ways will completely ruin any precision that Proxxon ever had.

Regards, Dan.

What's the problem with a couple of spragg bearings? You could drive the leadscrew via a flat belt and just have a lever and idler that introduces slack in one position, let it backdrive the high speed motor when cutting? Same idea, but with two belts, two idlers and a pair of stacked pulleys each e...

Looks like a DIY job to me, do you have schematic diagrams of the thing?
Also, what is it doing, not doing or doing incorrectly?

Interesting paper that may be relevant.

https://hal.archives-ouvertes.fr/hal-00436594/document