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Old 5th April 2013, 12:23 AM   #1
DaveM is offline DaveM  United States
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Default My Teres bearing project

I thought I would share my work to date. I've taken lots of pictures to share with friends. Progress is on hold for now due to life intervening, but I will get back to it soon.

Dave
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Old 5th April 2013, 12:27 AM   #2
DaveM is offline DaveM  United States
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According to solidworks the platter weights 38 lbs. The platter is Delrin and the weights are class 1 brass weights I saved from the recycling bin.

I decided to add some magnets to attempt some mag lev. If not to hold the entire mass, at least to reduce wear on the thrust bearing. That is the next step.

Dave
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Old 5th April 2013, 12:29 AM   #3
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Cool!

jeff
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Old 5th April 2013, 07:38 PM   #4
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Very cool. I have a Teres myself and it is a fine player indeed.

Fran
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Old 6th April 2013, 08:36 PM   #5
AVWERK is offline AVWERK  United States
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Very nice work!
Do you have plans to balance it when your done?

Regards
David
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Old 6th April 2013, 11:40 PM   #6
DaveM is offline DaveM  United States
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At this point, I don't have plans to balance it. I did all of the turning in one setup, so I know that all the dimensions from the press fit of the bearing out at true. I centered the platter on the rotary table and from there milled all 24 weights. From my runout measurements, this thing is dead on. The only question now would be how consistent is the density of the plastic. At this point to balance it would mean making a fixture, removing the bearing and pressing in the fixture to verify the balance. I'm not sure it is worth it.
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Old 7th April 2013, 12:09 AM   #7
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It looks like that Clausing is almost big enough for this project...

I used to own a Teres. It started out as a 135 all acrylic. Then I put the lead shot loaded platter (upgrade exchange program) on it. That was a pretty big upgrade over the standard weight platter.

As for balance, I think all Chris and his brother did was to verify the weight of shot put in each milled pocket of their platters. The precision of the machining operations was enough to otherwise guarantee good balance to the rotating mass of the platter.

What do you plan on using for a drive motor? DC with vhs tape belt, or perhaps silk cord. Or perhaps the Verus Wheel drive?

Btw, I've used the Verus for a time and wrote a review of it here:
Verus Motor Upgrade

Please keep us posted. This should be fun.

-Steve
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Old 7th April 2013, 12:14 AM   #8
DaveM is offline DaveM  United States
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I have a maxon motor with a mark kelly motor controller. It will run off a massively over sized battery salvaged from another work scrap salvage. I am thinking thread, but I have a pulley for tape as well.

For a tonearm I have a nottingham space arm. I picked it up for real cheap a few years back. I'd like to do a linear air bearing arm at some point, but I think will be the second arm on this table.
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Old 7th April 2013, 12:36 AM   #9
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Quote:
Originally Posted by DaveM View Post
I have a maxon motor with a mark kelly motor controller. It will run off a massively over sized battery salvaged from another work scrap salvage. I am thinking thread, but I have a pulley for tape as well.

For a tonearm I have a nottingham space arm. I picked it up for real cheap a few years back. I'd like to do a linear air bearing arm at some point, but I think will be the second arm on this table.
Click the image to open in full size.

Click the image to open in full size.

Mine had the A-Max 110189. I had several upgrades of the controller. Which was of the original Manfred design. This controller, while providing a rather neat on/off feature was probably the weakness and cause for the laid-back sound qualities of the deck. I presume the Mark Kelley controller should impart a very different character. The motor itself has power. I think I once figured that at 33-1/3rd platter rpm, my motor was outputting 8watts.

Please note that the reason I call my old Teres "laid back" is because when I got a TD124, I discovered what the opposite of laid back is.

Another thing I learned about the A-Max. It requires periodic oiling. If not, the motor starves for lube. Not good. Figure once a year, re-oil its bushings.

-Steve

Last edited by user510; 7th April 2013 at 12:57 AM.
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Old 7th April 2013, 01:11 AM   #10
DaveM is offline DaveM  United States
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Good to know. Thanks for the tip on maintenance. I'm sure there are plenty of others who could use the same tip.
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