looking for a DIY end of record lift for a manual tt
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About thirty years ago, Monitor Audio made a rather natty little device called "Stylift". It was essentially a vertical post with a pivot sticking out horizontally about halfway up. On the pivot rotated a cylindrical vertical weight with a thin bar sticking past the pivot. The weight was rotated to be at the top (where it was unstable) and the bar rested against a stop. The idea was that the arm would gently knock the cylindrical weight and it would overbalance, the thinner bar would then swing up and collect the arm. Although it sounds bizarre, it worked very well and I successfully made a couple for higher mass arms.
Empire made something like that, too, for their turntables. I used one- once; when the arm hit the trigger, the weight swung around the pivot, lifted the arm, and it kept going. Bounced the stylus off the label, onto the spindle, and sheared the cantilever off neat as you please.
I suspect that a silicone damped arm would be a better candidate for a device like this.
I suspect that a silicone damped arm would be a better candidate for a device like this.
I've used the Stylift without the disaster that Sy describes, but it never worked very well, possibly owing to my own ham-handedness. Positioning is very critical, at least on a Sondek, and it was either have it too close to the record's perimeter and lose the last few bars, or have it too close to the centre and have it not lift the arm. It turns out that there are enough out-of-spec records that both of these events happened too often for my liking even when the device was in the exact right spot. So I gave up on it.
I have fantasized about, but never built nor even properly designed, a lift which would use an optical sensor to trigger a (hydraulic? magnetic?) lift arm - see the drawing, which shows a plan view. Ideally, I suppose, a second optical sensor mounted towards the outside would reset the lift to its lowest point when you moved the arm back out.
Regards.
Aengus
[edit: grammar fix
...and typos 
]
I have fantasized about, but never built nor even properly designed, a lift which would use an optical sensor to trigger a (hydraulic? magnetic?) lift arm - see the drawing, which shows a plan view. Ideally, I suppose, a second optical sensor mounted towards the outside would reset the lift to its lowest point when you moved the arm back out.
Regards.
Aengus
[edit: grammar fix
...and typos ]Attachments
Yes, I was aware that a lot of people didn't like the Stylift. I think it's great and I have one on my SME3009S2 and would have one on my homebrew arm except that I failed to leave room for it. It's true that ou-of-spec. records cause problems, but you can't blame that on the mechanism, more the record. John Martyn's "One World" is a case in point, with a ridiculously small recorded diameter.
Agreed, not the fault of the mechanism, but frustrating nonetheless. The real issue, I suppose, is whether the geometry of one's particular table and arm allow positioning the Stylift far enough away from the arm pivot that the arm has significant lateral motion at the Stylift. Ideally suited to 12" arms, perhaps?
On looking at my previous post, even two edits were apparently insufficient. I meant to say that the drawing showed an elevation, not a plan view.
Regards.
Aengus
On looking at my previous post, even two edits were apparently insufficient. I meant to say that the drawing showed an elevation, not a plan view.
Regards.
Aengus
Nanook said:
Hi Nanook
I've seen something similar tried. The problem is that as soon as the magnet on the tonearm starts to get within range of the stationary magnet, it starts to lift and drag the tonearm across the remaining grooves - an ugly sight (and sound). I suppose one could interpose shielding material to make the magnetic connection wait until everything was almost aligned, but it seems it would be tricky.
Regards.
Aengus
Hi Nanook
I've seen something similar tried. The problem is that as soon as the magnet on the tonearm starts to get within range of the stationary magnet, it starts to lift and drag the tonearm across the remaining grooves - an ugly sight (and sound). I suppose one could interpose shielding material to make the magnetic connection wait until everything was almost aligned, but it seems it would be tricky.
Regards.
Aengus
Aengus....
obviously I was thinking about having the ability to adjust the distance between the magnets (and also trying varying strengths of them). It may work, it may not but may be worth a try. If magnets can be used to adjust anti-skating, why couldn't they be used as a lift.? Again, this is only an idea.
stew
obviously I was thinking about having the ability to adjust the distance between the magnets (and also trying varying strengths of them). It may work, it may not but may be worth a try. If magnets can be used to adjust anti-skating, why couldn't they be used as a lift.? Again, this is only an idea.
stew
Hey Stew
Yep, not saying it can't be made to work. Just that the implementation I saw clearly demonstrated that dragging the arm laterally was a problem that would have to be overcome.
I suppose one could adapt the optical device I proposed earlier to trigger a lever that moves the magnet within range once the stylus is in the run-out grooves. But as you say, it may be possible just by carefully tuning magnet strength and distance.
You have to remember, though, I'm the guy who couldn't even get the Stylift working properly, so fine-tuning mechanical bits is obviously not one of my strengths.
Regards.
Aengus
Hi, mandym here, reporting for duty.
I am the fellow who arnoldc referred to as the maker of the arm lifter "Tonal". I will gladly answer your questions through this forum and will encourage members to build their own. Nanook come close, real close to the operation of the gadget. The problem about the stylus being dragged across the record surface is solved through a teeter-totter system that triggers the pick-up magnet to attract the arm straight up vertically. It does not launch the arm in orbit, all one hears is a very light thump to announce a "successful lift-off".
I have sent a video of the Tonal in operation to Badge. Maybe he can be badgered to show it?
mandym
I am the fellow who arnoldc referred to as the maker of the arm lifter "Tonal". I will gladly answer your questions through this forum and will encourage members to build their own. Nanook come close, real close to the operation of the gadget. The problem about the stylus being dragged across the record surface is solved through a teeter-totter system that triggers the pick-up magnet to attract the arm straight up vertically. It does not launch the arm in orbit, all one hears is a very light thump to announce a "successful lift-off".
I have sent a video of the Tonal in operation to Badge. Maybe he can be badgered to show it?
mandym