[Delta Wave]

I just updated a Missision 775s deck with a modded Luxman/Micro Seiki arm, some nicely machined Delrin and a bit of nice polishing. I'm experiencing a teensy bit of a speed problem that's only noticable on a few very dynamic recordings. Anyone know of any motor upgrades and/or speed controlers for this set-up? And yes, it has a brand new belt and is properly lubricated. Aside from the speed, the sound is stellar.

[BaMorin]

Send me the diameter of the shaft and the captured ball via email, I'll send you a thrust bearing for the bottom of the bearing well, along with some material to resurface the spindle and some photos on how it's done. The mass of the platter spinning free should overcome any stylus drag issues. The current system, as I've seen it, is a fairly high friction bearing.

[Delta Wave]

Cool, I'll have something for tomorrow sometime. A bearing issue eh? I have overlooked that I suppose as I'm used to seeing miniscule things like that in robotics.

[BaMorin]

Cool, I'll have something for tomorrow sometime. A bearing issue eh? I have overlooked that I suppose as I'm used to seeing miniscule things like that in robotics.

Easiest way to check that is to remove the belt, install a strobe disk and hand spin it up to 33.3. Time it to complete stop. As an example, in AR tables with a similar bearing set up as yours in stock form, average spindown time is 40-45 seconds. After bearing modification, spindown time averages around 3 minutes. In the stock form you have a natural brake working against the belt. I don't believe you have varying wall frequency during a heavy passage. A speed controlling device to give you a pure constant 60hz will not address that brake issue. A speed controlling device that senses platter speed via motor draw and adds current or synthetic frequency to get an "average" 60hz will cause additional speed issues. First the one created by the stylus drag, and then the "corrected" speed.

I've built bearings for people on the AK forum for different types of tables all with positive results in timing issues and background noise. I have over 300 bearings in AR tables around the world.

BaMorin@AOL.com

[Wayner]

In the case of the AR (or Empire tables), you simply fetch the bearing out of the well and flip it over. Good for another 20 years.

Wayner

[Delta Wave]

Thanks guys, this is my first decent belt-drive I'm playing with. I still prefer my DD Lux/MS

[BaMorin]

In the case of the AR (or Empire tables), you simply fetch the bearing out of the well and flip it over. Good for another 20 years.

Wayner

Well, no it's not.  It doesn't address the ballend of the spindle that is chewed like an old dog bone. It doesn't address the delrin disk will get a dent in it real fast and your back to a ball and socket joint instead of a single rotational point. It doesn't address the surface structure and crosshatch angle on the spindle for peak film strength. etc. etc. etc.  Simply flipping the disk in an AR doesn't affect spin-down time. Nor will it reduce any rumble.

[Wayner]

Well, no it's not.  It doesn't address the ballend of the spindle that is chewed like an old dog bone. It doesn't address the delrin disk will get a dent in it real fast and your back to a ball and socket joint instead of a single rotational point. It doesn't address the surface structure and crosshatch angle on the spindle for peak film strength. etc. etc. etc.  Simply flipping the disk in an AR doesn't affect spin-down time. Nor will it reduce any rumble.

The spindles are usually just fine. The wear dent in the washer is so small to begin with, and considering it took, 20+ years to get to that condition means it's a non-issue. And your last statement is a grab bag.

I've never seen the end of a spindle, chewed like a dog bone. All of mine are nice and shinny and like the day they were made.

The other side of the Delrin disc will get a dent in it in about 20+ years, just like the first side.

The stuff I highlighted in red is foo-foo dust.

w

[BaMorin]

The spindles are usually just fine. The wear dent in the washer is so small to begin with, and considering it took, 20+ years to get to that condition means it's a non-issue. And your last statement is a grab bag.

I've never seen the end of a spindle, chewed like a dog bone. All of mine are nice and shinny and like the day they were made.

The other side of the Delrin disc will get a dent in it in about 20+ years, just like the first side.

The stuff I highlighted in red is foo-foo dust.

w

http://www.frt-gmbh.com/en/products/custom-solutions/microprof-cylinder/

Yeah, I guess you're right.........they even make machines to test foo foo dust.

[Delta Wave]

The spindle, seat and well are perfect, I think it just needs an new bearing but thanks anyway.
Ok, how about a supplier for new motors, anyone?

[BaMorin]

The spindle, seat and well are perfect, I think it just needs an new bearing but thanks anyway.
Ok, how about a supplier for new motors, anyone?

I don't think a new motor will cure anything if yours is running. It should be a syncro motor that locks into wall frequency.  By bearing, are you refering to the ball?  if so email me with the size you need........also the shaft diameter. This is a pretty simple fix.

[Delta Wave]

Not "the" motor, "a" motor.