DIY Personal Turntable

[doitmyself]

Oups forgot photos.
Part2 again:

 

[doitmyself]

Part3:

 

[doitmyself]

Part4:

 

[Helmuth]

Yes Helmuth, this idea is a good option, not applicable in my case because of the price of the servo motor and servodrive. That's why I used 2 spaced bearings, instead of a copper bush on top. I think that contact surface is higher with a bush than a bearing (that's my opinion, I can be wrong).

I think you did not look good, see how the drive belt is placed this way with 1 motor you get the same result. As far the force of the drive belt on the platter is concerned.

 

[Helmuth]

The looks areimpressive although it is largely naked for now. I can't wait on the rest to come.

 

[doitmyself]

I think you did not look good, see how the drive belt is placed this way with 1 motor you get the same result. As far the force of the drive belt on the platter is concerned.

Yes this can be tested, very easy to apply on my TT.
I added it to my modifications liste.

 

[hidnplayr]

I think it looks good!

If it doesnt work very good, you can sell it to a bakery so they can put their pies in the store on it!

 

[doitmyself]

I think it looks good!

If it doesnt work very good, you can sell it to a bakery so they can put their pies in the store on it!

Good idea, let me keep it in a corner of my mind.

 

[doitmyself]

OK, while waiting for the raw material for bottom rotating platter, I had a look to the servodrive. Here is the datasheets:

 

[doitmyself]

And here is my schematic for test purposes. If OK, I had to think for replacint the potentiometers by 2 regulators (45 and 33 rpm).

 

[RCruz]

Why do you need to replace the pot ? (I only see one)

 

[doitmyself]

Why do you need to replace the pot ? (I only see one)

This schematic is only to test the drive. In final, I'll need two speeds (33 and 45 rpm).
And there are a lot of solutions, like this, or with a second DC power supply (+24Vcc for drive control inputs, and 3V for speed control).

 

[Helmuth]

This schematic is only to test the drive. In final, I'll need two speeds (33 and 45 rpm).
And there are a lot of solutions, like this, or with a second DC power supply (+24Vcc for drive control inputs, and 3V for speed control).

I would advise a fixed voltage divider for both speed and at the top in series with the divider a potentiometer for fine control.

Like in the drawing do not care about the value's of the resistors it is only to get a idea. The potentiometer has only that big it compensates 2 or 5% speed variation.

So you must try to tune R2 and R3 to the precise value with the potentiometer in the middle position so you can give +/- adjustment.

 

[doitmyself]

I'll get my pieces for the bottom rotating platter this morning.
Here is the photo of what I want to get:

 

[doitmyself]

But my problem is that I don't have a big raw material to realise it.
So I had to proceed differently. Here is what I have:
-1--> Ø280x200mm
-1--> 60x10 lg 950
-1--> 20x20 lg 900

 

[doitmyself]

The solution is to bend the 60x10 and 20x20, and weld them before working on machines

 

[Helmuth]

The solution is to bend the 60x10 and 20x20, and weld them before working on machines

That seems to me very difficult to get the bending right and welding will cause tension and bending of the platter.

I would think it would be easier to cut more disks of aluminum and bolt them together. And then machine and balance them. You shout balance all turning parts.

 

[doitmyself]

That seems to me very difficult to get the bending right and welding will cause tension and bending of the platter.

I would think it would be easier to cut more disks of aluminum and bolt them together. And then machine and balance them. You shout balance all turning parts.

Ha ha, you don't know the famous french sentence: "Impossible is not French".

 

[doitmyself]

I've got the bended pieces:

 

[doitmyself]

And first part of welding: