a couple of turntable restorations

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Vinyl-ant
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Re: a couple of turntable restorations

Unread post by Vinyl-ant »

No worries stu, it'll get done when it gets done

There are many many things more important :mrgreen:
I am (barely....) in the hi-fi trade
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Vinyl-ant
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Re: a couple of turntable restorations

Unread post by Vinyl-ant »

More stuff done.
To make it more user friendly I made an arm lift/lowerer thing
Bits

ImageCx unipivot arm lift/lower by anthony cresswell, on Flickr

The cylinder is the body obviously, the spring is out of a pen, just cut down to the right size. The lever is simple enough, there is are 2 cuts machined into the large part that goes through the body so that it keys onto the piston part. The L shaped end is what it keys on. The bar has had 3 quarters cut out so that when the lever goes up it raises the piston against the spring and locks in the upward position at the top of travel.
the groove in the piston is there to retain the silicone grease for damping the lowering.
The piston locks the lift bar in place so it cant come out without pulling the top of the piston up to release it. the curved bit is the bit that lifts the arm. Just some 3mm acrylic.

Assembled

ImageCx unipivot arm lift/lower by anthony cresswell, on Flickr

the other two holes are the mounting points to attach it to the arm outrigger
Like this

ImageCx unipivot arm lift/lower by anthony cresswell, on Flickr

The setscrew needs to be shorter, but is fine for now

ImageCx unipivot arm lift/lower by anthony cresswell, on Flickr

It works fine, feels a bit gritty because of the surface finish inside the housing. I should have bored it rather than just drilling it out, then it would have felt smoother, but I can live with that.

Took some working out how to make one and have it lock into position, It would have been handy if I had one off something to look at, but i havent got any arms with one on......

quite pleased with it
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I am (barely....) in the hi-fi trade
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r3xj0hn570n
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Re: a couple of turntable restorations

Unread post by r3xj0hn570n »

Awesome. I can offer photos of a disassembled Jelco lift if that is of any use to you for the future.

Vinyl-ant
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Re: a couple of turntable restorations

Unread post by Vinyl-ant »

Thanks for the offer, i should be ok though i scribbled up some drawings of the bits as i was making them if i want to make another one

Cheers ant
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Daniel Quinn
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Re: a couple of turntable restorations

Unread post by Daniel Quinn »

Off topic. I've got several dismantled arm rests (jelco and rega) I'm I right in thinking that the silicon gel is the only thing the rely on or is their something else. If so what.

If not damping depends on silicon quality?

Vinyl-ant
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Re: a couple of turntable restorations

Unread post by Vinyl-ant »

The viscosity of the silicone grease and the spring rate is what affects the damping when it drops
The stuff i used in this one is rated at 60000 centistokes. It could have done with some higher c/s to give it a slower drop to match the spring which is abit stronger than necessary with it being a pen spring
I am (barely....) in the hi-fi trade
Status: Manufacturer
Company Name bte designs
Www.bte-designs.weebly.com

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