Crafting a DIY Lathe Recorder from Scratch HELPP

[fanelx]

Hello everyone

I am building a vinyl lathe recorder (Embossing) from scratch as a diy project, and although I have gathered quite a bit of information, I still have several questions. I would appreciate any advice or suggestions regarding the following points:

Topic 1: Design and Parameters of Needles for Recording (Embossing and Cutting)

1-What is the difference between an embossing needle and a cutting needle?
2-Is it possible to DIY an embossing needle using a tungsten welding rod?
3-What geometry should the needle’s tip have for the best results?
4-What angle should the needle maintain in relation to the disc during the process?
5-Should the needle’s edge be conical or flat, similar to a knife?
6-What pressure should the needle apply to the disc during recording?
7-Is it necessary to use a heat source for embossing?
8-Regarding the rotation speed, should it be the same as that used during playback?

Topic 2: Audio Measurement and Recording for Torquetube Speakers

9 How can I measure the required decibels on the speakers connected to the torquetube?
10. At what volume is it recommended to record to achieve the best audio quality?

I will attach some photos of my progress.

Thank you very much in advance for your help and for sharing your experiences!

[markrob]

Hello everyone

I am building a vinyl lathe recorder (Embossing) from scratch as a diy project, and although I have gathered quite a bit of information, I still have several questions. I would appreciate any advice or suggestions regarding the following points:

Topic 1: Design and Parameters of Needles for Recording (Embossing and Cutting)

1-What is the difference between an embossing needle and a cutting needle?
Embossing does not remove any material from the disc. It just indents or impresses into the surface.

2-Is it possible to DIY an embossing needle using a tungsten welding rod?
Sure! There are quite a few posts on this here. Do some searching.

3-What geometry should the needle’s tip have for the best results?
The easiest is a simple simple cone shape. People have flipped a standard cutting stylus backwards to make an embosser.

4-What angle should the needle maintain in relation to the disc during the process?
Generally, an emobosser is tilted back (5-25 degrees) so it does not dig, but you will need to experiment to find the best results.
Cutting stylii tend to be much closer to vertical


5-Should the needle’s edge be conical or flat, similar to a knife?
It depends if you are cutting or embossing. Cutting stylii have a flat front profile with a compound back angle
so it is very much like a metal lathe cutting tool.

6-What pressure should the needle apply to the disc during recording?
Again, it depends on the method being used. In very broad terms, cutting takes much less
then embossing. Embossing I would look in the 20-40g range.

7-Is it necessary to use a heat source for embossing?
Not normally.

8-Regarding the rotation speed, should it be the same as that used during playback?
Not necessarily. You can cut at lower speeds (if you pitch you audio down by the same ratio).
This has benefits especially if you head has poor high frequency response.

Topic 2: Audio Measurement and Recording for Torquetube Speakers


9 How can I measure the required decibels on the speakers connected to the torquetube?
You don't. You measure excursion or velocity. That represents the motion of the stylus in the groove.

10. At what volume is it recommended to record to achieve the best audio quality?
typical reference levels for disc recording is 5cm/sec rms

I will attach some photos of my progress.

Thank you very much in advance for your help and for sharing your experiences!

Hope some of this helps.

Mark

[boryo]

you can also take a look here, the first post: https://www.lathetrolls.com/viewtopic.php?f=22&t=8328