DIY turntable, am I just missing the point?

sdedalus · 17th June 2006, 07:00 AM

I'm trying to plan out a diy turntable, but I've never taken apart a good one so I really don't know how the bearing should work.
I drew out a quick and dirty layout which is attached. Is there anything that looks incredibly stupid? Would this bearing work well enough for a turntable?

Thanks

Holger Barske · 17th June 2006, 08:10 AM

Can't see anything that serves as a vertical bearing...?

sdedalus · 17th June 2006, 08:29 AM

I just realized that I was thinking in terms of telescope mount bearings.
The steel spindle would go into the teflon sleeve, but I think there'll be way too much friction where the flanges of the sleeve and spindle make contact.

sreten · 17th June 2006, 01:07 PM

Hi,

The sleeve as a sleeve is fine. You need to add a ball bearing and thrustpad.

The ball bearing sits in a V shaped well of the steel shaft. Add a vertical thrustpad/spindle.

/sreten.

Cloth Ears · 17th June 2006, 02:29 PM

You need an axial ball-bearing race. Think of how smoothly a large roulette wheel glides around - almost as easily as it removes your money.

One between the flanges of the teflon sleeve and the steel spindle is where you want it.

sreten · 17th June 2006, 04:28 PM

Quote:

Originally posted by Cloth Ears
You need an axial ball-bearing race. Think of how smoothly a large roulette wheel glides around
- almost as easily as it removes your money.

One between the flanges of the teflon sleeve and the steel spindle is where you want it.

Hi,

Erm....... no you don't. Far too noisy. Ball bearing + thrustpad is what's needed.

/sreten.

sdedalus · 17th June 2006, 05:13 PM

So something like this?
Could I just glue a metal disc to the end of the teflon sleeve?

Holger Barske · 17th June 2006, 05:16 PM

Quote:

Far too noisy

Not necessarily at this low rotational speeds. But I agree, a single centered ball would of course be the much more commen solution.

Holger Barske · 17th June 2006, 05:17 PM

Sdedalus,
yes that way. But you must explain to me how you want to glue something to teflon

sdedalus · 17th June 2006, 06:03 PM

You know I think it would be better to do something more like this, just use a plain teflon sleeve that buts up against a 3" metal disc sunk into the surface of the platter, and held by 4 longish wood screws. Also go to a .5" shaft and sleeve ID with a .5" steel ball.

Oh, if you texture the surface to be glued, teflon will adhere. It'll never be a strong bond, but you can use it for light duty stuff.

17th June 2006, 08:10 AM	#2
Holger Barske diyAudio Member Join Date: Jan 2001 Location: Ruhrgebiet	Can't see anything that serves as a vertical bearing...? __________________ Best regards: Holger www.holgerbarske.com

17th June 2006, 02:29 PM	#5
Cloth Ears diyAudio Member Join Date: Dec 2001 Location: Melbourne, Australia	You need an axial ball-bearing race. Think of how smoothly a large roulette wheel glides around - almost as easily as it removes your money. One between the flanges of the teflon sleeve and the steel spindle is where you want it. __________________ Jont. "It is impossible to build a fool proof system; because fools are so ingenious."

17th June 2006, 05:17 PM	#9
Holger Barske diyAudio Member Join Date: Jan 2001 Location: Ruhrgebiet	Sdedalus, yes that way. But you must explain to me how you want to glue something to teflon __________________ Best regards: Holger www.holgerbarske.com

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17th June 2006, 08:29 AM	#3
sdedalus diyAudio Member Join Date: Feb 2006 Location: Chicago	I just realized that I was thinking in terms of telescope mount bearings. The steel spindle would go into the teflon sleeve, but I think there'll be way too much friction where the flanges of the sleeve and spindle make contact.

17th June 2006, 01:07 PM	#4
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, The sleeve as a sleeve is fine. You need to add a ball bearing and thrustpad. The ball bearing sits in a V shaped well of the steel shaft. Add a vertical thrustpad/spindle. /sreten.

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