SoundEasy V28 released - ANSI-CTA-2034 automatic measurements

[soongsc]

I browsed through the G code set, it seems like an added layer of coding to decouple the machine from the application. However, it is designed for the complexity of CNC manufacturing. So the commands are not so direct. I am wondering whether such complexity is necessary in just turning a table incrementally. Do they actually transmit the ASCII code?

[soongsc]

Thank you, George. I would recommend considering implementing a G-code option, as that would open up other options to the DIYer community due to the myriad of CNC-based accessories available these days.

I am not familiar with G-code. As a matter of fact, I did not do any coding, and Bohdan basically sent the command codes in the ASCII format. So he just modified some of his existing RS233 code to get it working. I just figured out how to use off-the-shelf parts as much as possible to get things working. We did look at the ARTA design, but felt we could not figure out what kind of commands they used and how complicated the coding would be. So we used our own design approach.

[Shonver]

Thank you, George.

I would recommend considering implementing a G-code option, as that would open up other options to the DIYer community due to the myriad of CNC-based accessories available these days.

[soongsc]

bohdan will you make the RS232 communications specification available, or are you making it exclusive for Soong's turntable?

Hi Shonver, The instruction set is Cool Muscle standard instruction set. If you use their motor, it would be a simple interface. Gear ratio is currently 100:1 in case anyone wishes to do their own design. We hope for more ideas to come out as well as more advanced features in SoundEasy. Whether Bohdan will support multiple interfaces is up to him. We chose this motor because it did not require too much effort on his part, and we thought that this was the easiest way to get the table implemented so that he could focus more on advanced measurement data processing. Hope this answers your question.

[Shonver]

bohdan will you make the RS232 communications specification available, or are you making it exclusive for Soong's turntable?

[soongsc]

Here is an update with the lower base expansion added, also added an additional arm to support the loudspeaker. The location of the arm can be adjusted, and the length of the arm will be extended to 30 cm (twice the shown length). Some cleanup of the design is pending some parts to come in.

A question had been raised whether the base will counter rotate when rotation during measurements or not. Our first impression is that due to the nylon balls used, we are not expecting it to react in such a way due to static friction. But in case it does happen, washers can be placed under the balls to keep it still. These will be provided as part of the kit.

[soongsc]

In case anyone would like to use the turntable to add their own speaker supporting rig, here are the dimensions and specs of the mounting bolts accessible from the top of the table.



And the holes to attach your own expanded bottom.

[soongsc]

Here is an update with the lower base expansion added, also added an additional arm to support the loudspeaker. The location of the arm can be adjusted, and the length of the arm will be extended to 30 cm (twice the shown length). Some cleanup of the design is pending some parts to come in.

[soongsc]

Hi Heinrich,

Thank you for the information. Yes, we had looked into the design and was inspired by it. How long did it take for the software to interface with the motor? What turning load did you expect out of the design?

Regards,
George

[RT60]

Hi Soongsc,

we did a similar project some years ago.
Here you will find some material:

https://www.youtube.com/watch?v=VSsbYYfASiM
https://artalabs.hr/AppNotes/ARTA-Ha...-GerRev1.3.pdf
https://artalabs.hr/AppNotes/AP-9%20...GerRev1.4a.pdf

Regards
Heinrich

[soongsc]

Some heavy weight concepts.

[soongsc]

This roller wheel for another project just came in. Seems like a nice low friction, low weight, and light solution. The only limitation is that it has to be used on a nice smooth solid floor due to it’s size. Thoughts?



My current thought is still going ahead with base expansion, but use these roller wheels to make it easier to move around. The outrigger option we should try for anechoic chamber application with larger wheels, in such case which actually three wheels would be required.

[soongsc]

Yes, it could be done that way. If this is the ARTA table, they have to do it like that because of the way their gearing is set up. The gears could loss contact if the load is not balanced near the center of the table. That table also would also have some difficulty being used in a second rotation axis due to the way the bearing, gear, and motor arrangement. If the speaker is taller than one meter, they would also have to place the mic further than 1 meter away from the speaker, otherwise the speaker could hit the mic at 90 degrees down position.

[bohdan]

The rig shown on the attachment is being used for the turntable measurements. Looks like there are solutions available.

[soongsc]

Anyone know of light weight 6" caster wheels out there? Immediately around me are some that weight quite significant. Looking for vinyl tires with plastic rims.