luvdunhill

The avgRPM assignment does a bit of smoothing. There are not a lot of mechanical losses, the belt has reasonable friction on the pulley and platter, so it can alter the platter speed with reasonable accuracy without it acting like a flywheel. I don’t know how much is audible but I can say that +/- 0.03 rpm isn’t audible and it makes adjustments less than this. Gor reference, the added friction of lowering the needle into the groove slows rotation about this amount.

Do you mean does the motor alter its speed at each rotation?

Yup - I guess in this case the difference was black and white.

My little box works by counting the number of times it sees something pass as the platter spins. You need to check fast enough so you don’t miss the thing as it passes by. The faster you can check you can increase the accuracy of your measurement. Originally I used a magnet and this worked well but seemed a bit less than ideal near a sensitive phono pickup. So I changed to using light. In order to make the sensor work with other types of light present (such as the light that comes out of a light bulb) I used certain frequency of infrared light. This light is emitted by my box and then when that light is reflected back from the object it notes that the object has passed and it computes the speed. With an acrylic platter with a record on top when the box asks if it has seen the reflected light, it says no until the white dot comes by, which reflects all frequencies of light and registers a “yes” with the system. But when an aluminum platter is used it always reflects the light. So I needed something that didn’t reflect the light I was using, which ends up being a black dot which absorbs light. One made the “physical” change in how the device operated I made a simple change in the code that basically looked for when the reflected light wasn’t present - which was the exact opposite to how it used to work with the white dot.

So, a bit of a stretch for this thread and I am doubting anyone will see the humor in this. But as y’all know o have been working in a tachometer feedback loop for my platter. With the lid off it looks like this: Previously I had an acrylic platter with a white dot that triggered the IR sensor each time it went around and used that to calculate the platter speed. Now I have an aluminum platter. To make it all work I had to add a black dot and update the code as follows. .. anyways I found this humorous.

New platter! .. and some A/B with the SA-CD player back in the rack.

Success! The aluminum was exciting to go through..

Send all the extras over here for proper disposal

So I received the bushing set a day early and think I got it all setup. I guess the dust collection has to come off when using the bushing insert?

So working to get my sacd player back in rotation. That means I need to stack two components on top of each other. my rack has one open location, then two shelves behind a door. I have: Pass XP15, Esoteric K-05x, MiniDSP SHD, Berning MicroZOTL (old style) I was thinking of the digital spinner on the bottom, as it needs the rear cutouts for inflexible cables. I like the amp visible on top. That then means stacking the miniDSP on the photo stage or under the amp and not sure which one is better. It’s a tight fit either way. As an aside I will run the spinner single ended as I need the extra balanced voltage swing for my low output carts. I haven’t done this yet so that will be a bit of a change. I guess I need to find a cable long enough - been a while since I bought a RCA cable Any suggestions or thoughts?

I found a 6” black and decker polisher for $30 on sale that works really well.

Ok, I think I figured it out. I want a 2.5” finished circle, using a 1/2” bit and a 3/4” outside diameter bushing so I need a 2.75” inside hole and a 4” outside diameter. The thickness would be best if more than 9/16” (that’s the height of the bushing). Did I pass the math test?

Hm I am not exactly sure. I have a router with a “Standard U.S. Guide Bushing Adapter” (Festool OF1010 EQ Imperial) but no guide bushing (or at least I don’t see one in the box). I have various straight shank bits in 3/8”, 1/2”, 3/4”. I need the finished inside diameter to be 2-1/2” and then the outside diameter to be 3-1/2” (or up to maybe 4”) and enough surface to make sure it sticks down real well.

A jig less gate. Just wood and screws. Is this the design you copied?

Oh yeah that project - I need a circle router template so I can recess the nut a bit on the back of the plinth. Ideal template would be a circle on the outside too so I could use that outside edge to cut away the dampening rubber backing on the plinth.

Quite possible. I don’t compare their BAI’s - now you mention it, it wasn’t cheap. Then they figured out that another one of these can’t move itself. So maybe they will fetch a crane.

So, after hurting my back I left some things up to the pros. Look how that turned out. Yes the blue and red color in the background is the EMS.

Only if you promise no one else will bother me about them

These old things?

Yes sir. For some chairs.

I got some wood stuff!

Oh and the defender of the internet

Cicada season is over, lizard season is in! Oh and this is always in season.

Titus Andronicus - nice refreshing break from work politics

Inverted bearing with a hole in it. I hope it fits