The Secret Society of Lathe Trolls

I guess phase shift essentially means poistive feedback starts to kick in? Would it not make sense to apply a low pass filter to the feedback signal?

I don't know about epoxy... I always assumed the stones were brazed or soldered or cemented in some way?

I have had one or two stones come loose (in over 20 years of full time cutting) but I put that down to perhaps a quality control issue at the production end.

I am sure I have seen a sales brochure recently when I was hunting. Here is a link to one in the flesh on here https://www.lathetrolls.com/viewtopic.php?f=22&t=5784&hilit=14b Thanks for the link, yes, that was why I was asking ;) I have seen a sales brochure around too, but nothing about the 14-B i...

DC motors just aren't ideal for the range needed. For a start, they don't work well at low rpms, so they need turn fast and be geared down, which introduces noise. Even if you could get the ratios required, the noise coming from that thing at the highest speed would just be off the chart. The soluti...

Anyone else been playing with DIYAudio Wolverine as a cutting amp, it is a fairly conventional class AB amp running at fairly high bias (0.5A or so per side), and manages a couple hundred watts in the 4 pair configuration, if you remove the input filter it is flattish out to 100k with little excess...

My experience is that heating helps to reduce hiss rather than crackling or static. This is true of diamonds on plastic (most noticeably when the diamond is fresh, less so when its worn in) but it is especially true of sapphires on acetate. Heating is essential to reduce noise on acetate surfaces. I...

markrob wrote: ↑

Sun Dec 15, 2019 8:57 pm

Hi,

Yep! I'm not sure if the motor is expected to operate over the 100:1 or more speed range needed to run all LPI's e.g lead-in's and lead-out up to 300 lpi during cutting.

Mark

You'd be lucky... dc motors give 10:1 at best I think?

I am really excited about this thread! BUT.... does that port only allow two options, follow the LPI pot or function at full speed? I'm also curious about that. Is it possible to make variable pitch by using this port? Thanks, Bob Yes, normally there is a jumper... pull it out and it bypasses the p...

How warped are your blanks!? There should be minimal warping on arrival, I always unwrap them and store them upright on a shelf (as with any vinyl) but I never get the sense that storage is an issue in that regard. Of course, there will always be a certain amount of deviation from flat, which is why...

So you run Bryson in a cutting setup? Moving coil Feedback cutterhead like Neumann ? This is quite a different job to driving speakers… As a listening amp I see no problem .they sound very Nice and as I said I can only talk about very bad experience long time ago with 90ies generation.trying to run...

Well, this is interesting. It's not the first time I read you are not heating the blanks. I also saw other people saying it these days. It is little bit confusing after all that people saying you need to heat it in the past. So why there is instructions that you should heat them? Is it because of e...

FWIW I run 2 x 3B-ST ... I can't speak for the earlier models apart from them coming up for sale very cheap sometimes, so I can only assume they are not so great. Generally Bryston amps are rock-solid work horses with the best warrantees in the business. They often come up second hand, still under w...

I guess I always assumed that the elecricity would take the path of least resistance... and that the minimal surface contact between windings of the same wire would ultimately be less conductive than the full gauge of the wire itself. After all, the wire is already kind of short circuiting, so in or...

Here is one I made earlier... 6 or 7 turns on that one, but you get the idea: https://www.instagram.com/dubstudio/p/CEb48Z1BhRS

Not exactly. OK so the method I use is as follows: 1) cut off a couple of inches of wire (length = 2 x distance of stylus from binding posts, plus 8 x windings, plus a little spare at each end to hold on to) 2) mount the stylus in the head 3) tie one end of the wire to a binding post, leave a littl...

i would listen to the guy who designed and make/made the Caruso heads ;) Of course, I am not disputing anything Flo says, but I think its important to draw the distinction between using pink noise to help quantify and verify any adjustments you make and using pink noise to correct a cutting head to...

What’s the best way to further correct the carusos frequency response? It’s close but needs some correction. Is it best to run white noise and auto correct with a eq matching plugin both channels at the same time? Maybe one channel at a time? Maybe not using a matching eq but just manually add more...

I would think a single impulse measurement would have a very low S/N ratio. If you average many impulses you can improve the S/N , but that's not so easy to do. I guess if you window out the single impulse to be very short in duration, you would effectively filter out all of the low frequency noise...

I would go very slow.cut some stuff you know and where you have the master and a reference on vinyl. listen on a decent system you know.compare and and do slight adjustments.. the fab filter .pink noise is the wrong way to go. Technically yes .but soundwise very bad idea… You don’t have to dream. C...

Can you record the noise and post it so I can hear it?