Help on DIY TT Clamp

Simonov · member Joined: 30 Nov 2006 Posts: 21 Location: Bulgaria

Hi guys

I'd like to make my own TT clamp but I'm not shure about the central opening's diameter.
This is what I mean.

The clamt shoult fit tight, but not too much. Is a 7.52mm appropriatediameter?

Regards:
Simonov
_________________
The Bulgarian Audiopfile Society

LPspinner · Posted: Mon Jan 08, 2007 9:02 pm Post subject:

Simonov:

It all depends on how accurate a location you want. A 7.5 mm diameter hole should provide an adequate level of fit and location while still providing enough clearance for easy removal of the weight. Make sure you pilot drill the hole first before you drill the finished size hole. The first drill you put in there will always drill the hole oversize. Even better would be to ream or bore the hole to the finish size.

The ultimate design would involve a tapered collette arrangement with a screw top to clamp around the spindle shaft this would mean a three piece clamp but if you are up to it, that would be the perfect solution.

LPspinner

Blue Angel · Posted: Mon Jan 08, 2007 9:11 pm Post subject: Help on DIY ...

Hi Simonov

Are you lathe turning it? The holesize should be OK. lpspinners idea with driiling undersize is correct, as is his recommendation for a collect clamping arrangement. The hole can also be machined by using a boring tool, which is the most accurate method.

Good luck!

blue
_________________
"If you don't like my principles, I have others" - Groucho Marx

LPspinner · Posted: Tue Jan 09, 2007 12:39 am Post subject:

Hi Again Siminov:

It’s been a slow day at work (always is after Xmas / New Year), so to fill in time I knocked up a drawing to explain how a tapered collet arrangement might look.

LPSpinner

LPspinner · Posted: Tue Jan 09, 2007 1:15 am Post subject:

OK… I give up how do I set up the code so that this image …

http://www.vinylengine.com/php.....abb0f56841

Will appear embedded into the post.

LPSpinner…

PS:
OK Guys I now have a fully detailed set of working drawings for the above mentioned clamp. If any one is interested, let me know and I’ll email them to JAS and see if he wants to post them in the Library.

Edited:

Oh so that's how its done: delete the bits after the "&" in the image link

Purnendu · Posted: Tue Jan 09, 2007 10:48 am Post subject: Drawings

Hi Lp,
That three piece design looks looks impressive. I would be interested in the detailed drawings.
Purnendu

Simonov · member Joined: 30 Nov 2006 Posts: 21 Location: Bulgaria

@LPspinner
WOW. This is pretty impressive. Have you tried it? Is it practicable at all?
Thanks for the drawing though. I wasn't really shure about your idea, but now everything is clear Wink

_________________
The Bulgarian Audiopfile Society

LPspinner · Posted: Tue Jan 09, 2007 9:06 pm Post subject:

Simonov · member Joined: 30 Nov 2006 Posts: 21 Location: Bulgaria

Some sort of a hard wood could be used for making the collet, I think. Beech-tree for instance. The cohesion between the clamp and the pivot shaft would be increased.

Am I right? Rolling Eyes

_________________
The Bulgarian Audiopfile Society

LPspinner · Posted: Wed Jan 10, 2007 8:55 pm Post subject:

HI Simonov

I’m not sure that wood would be all that durable since there is a fine pitched M10x1 thread at the end of the collet that is used to draw the collet into the taper. I have specified aluminium for the collet and brass for the Nut and body; if you wanted to use steel for the body I would only use an Austenitic (non-magnetic) stainless steel, as magnetic steel and moving coil cartridges can have a fatal attraction.

I have emailed Jas A PDF file that has the fully detailed drawing set for the assembly and all the individual components, so stay tuned and I’m sure Jas will put it the download section when he has the time to set it all up.

LPSPinner.

JaS · Posted: Sat Jan 13, 2007 2:42 am Post subject:

Thanks to LPspinner the drawings are now available in the library Very Happy

http://www.vinylengine.com/diy-record-clamp.shtml

Regards,
JaS

dcheek · Posted: Sat Jan 13, 2007 1:56 pm Post subject:

Has any VE enthusiast with machining ability attempting to make one of these? If they are I would be interested in purchasing one for my AR XA, XB and Thorens 145.
Dave
_________________
AR XA, Shure V15 Type IV (Original Owner), AR XB, Shure V15 Type II (from Ebay), Thorens 145(Original Owner), Shure V15 Type III (Original Owner)

Beltway · Posted: Tue Nov 13, 2007 12:16 am Post subject:

I liked this design the first time I saw it. Later I discovered an ebayer in the Ukraine selling a brass version which weighed 350 grams so I gave it a try.
Unfortunately the collet was damaged on arrival due to poor packing, so he sent another one. This time the threads on this one didn't match the threads in the knob.
I did get it working and use it all the time but I'm not a golden ear (due to loud music, heavy equipment, skeet shooting etc.) so I don't know if it makes any sonic difference, but it is the best design I've seen (although I would like to try the VPI record ring).

LPspinner · Posted: Tue Nov 13, 2007 7:01 am Post subject:

Abandonflip · Posted: Tue Nov 13, 2007 9:22 am Post subject:

I've used a lightweight (clear plastic) collet-type clamp before, which eventually started to crack around the collet with age. However, pairing it with a Pink Triangle TT I was rather reluctant to use anything heavier.

For that reason, screw-down clamps have always appealed - I particularly liked the looks of the aluminium one Oracle use(d) - but Pink Triangle's rendering of the idea was always a bit limp IMO. Theirs was small in diameter (60mm perhaps?) and only contacted a small part of the record label. Perhaps because they used it with a concave platter, it always just seemed to be distorting records at their centre.

The thought of a clamp is still appealing, but fitting even screw-down types to softly sprung TT's fills me with dread. Perhaps someone could create a device that holds the platter firmly in place while the clamp is being fitted - any takers?