rho
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« Reply #75 on: May 23, 2010, 05:41:34 PM » |
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Mainly so you don't compound any irregularity problems. But I've found o-rings to be quite well made with few irregularities from their forming process.
To be honest, I can easily stay within .001" (.025mm) with a manual lathe. I would bet that so can most of our lathe enthusiasts here. The only tolerance you've specified is wobble, and frankly if they can't maintain the specified .002" (.05mm) it's a little silly. But you can always specify .1mm, however you can pretty easily see .004" and if it's getting that bad, then I'd look elsewhere.
Yes, at school with some really old lathe I could stay within 0,025mm. With the CNC machine we had we could do better. And that was about 15 years ago. I guess with a newer machine it shouldn't be any problem to stay within that tolerance. |
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Rik
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Johan
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« Reply #76 on: May 23, 2010, 07:58:55 PM » |
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I had a plastic wheel sent there for service. After some weeks it came back and was better than before. I am not sure what was done, as that was in my beginning of the Lenco addiction and I didn't know very much at that time. I think the idler rubber was sharper and that the rubber outside was more circular than it was to begin with. I actually dont know if they rebuilt the wheel or if is was just grinded. Perhaps they decided to grind it because it was pretty good. It would be interesting to know if others have tried them and what they do. |
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Johan
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Uncle Ants
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« Reply #77 on: May 25, 2010, 12:18:36 PM » |
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It would be interesting to know if others have tried them and what they do.
I'll find out soon. I have a spare, slightly long in the tooth Idler on it's way to them. |
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My name is Tony
In Recordeo Speramus
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Uncle Ants
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« Reply #78 on: June 14, 2010, 12:07:03 PM » |
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It arrived back this morning. So a 20 day turn around with postage to Sweden and back, which is exactly what they said.
It's definitely new rubber, rather than the old one reground. And they look to have got the profile correct as well. haven't had a listen to it yet. I may get a chance to swap over this evening.
Edit - just to say this was a metal idler wheel not a plastic one.
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My name is Tony
In Recordeo Speramus
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rfgumby
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« Reply #79 on: June 14, 2010, 03:10:49 PM » |
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It arrived back this morning. So a 20 day turn around with postage to Sweden and back, which is exactly what they said.
It's definitely new rubber, rather than the old one reground. And they look to have got the profile correct as well. haven't had a listen to it yet. I may get a chance to swap over this evening.
Edit - just to say this was a metal idler wheel not a plastic one.
These guys, right? http://svalanderaudio.com/vinyl/wheelseng.phpPlease report back when you get a chance Uncle.  It's a great resource, and if you say they are good, then adding a link in the Links or Traders section would be wonderful! |
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Scott
It's better to burn out, 'cuz rust never sleeps
Hey hey, my my.
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Uncle Ants
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« Reply #80 on: June 14, 2010, 05:07:02 PM » |
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Those are the guys yes.
I just tried it out In the last hour ... And it makes an audible and measurable difference to the amount of low level rumble compared to the metal idler I had fitted. All lencos (that I've measured anyway) have a low level rumble peak at around 23hz (i think it'd be about 27hz on a US model) plus some harmonics higher up. This looks to have dropped by about 7 or 8db by measurement with the new wheel and the noise level has audibly dropped between tracks or on a blank groove at high volumes ... To the extent that it's now inaudible for practical purposes.
I'll run it for a while to see that it stays that way but so far it's 30 odd Euros well spent.
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My name is Tony
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Johan
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« Reply #81 on: June 14, 2010, 07:54:35 PM » |
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That is good information. Thank you for reporting!
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Johan
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Uncle Ants
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« Reply #82 on: June 14, 2010, 08:07:30 PM » |
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Of course that's relative to my old idler wheel ... I have no idea how it would perform relative to your old idler wheel. Still it seems to suggest there may be real value in new rubber.
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« Last Edit: June 14, 2010, 09:30:25 PM by Uncle Ants »
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My name is Tony
In Recordeo Speramus
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bellebattut
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« Reply #84 on: June 29, 2010, 12:27:34 PM » |
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Sorry guys. Just realised that this has already been covered.
Bill
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strata
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« Reply #85 on: June 29, 2010, 12:58:08 PM » |
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I shop there all the time, he is fast and dependable.  Michael |
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Michael
"I rather have a beer bottle in front of me, than a pre frontal lobotomy"
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Kent T
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« Reply #86 on: July 31, 2010, 02:48:35 AM » |
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Gentlemen,
I have an idea! Why not CNC made replacements from the same materials as original. And we might even be able to make new Lenco components without nothing we need to remove to make our super tables. New Lencos for all! We can surely do that with today's technology!
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Idlers rule. Belt Drives Drool!
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rho
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« Reply #87 on: July 31, 2010, 06:58:28 AM » |
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Sure
...but are you willing to pay for it.
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Rik
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low pitch
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« Reply #88 on: July 31, 2010, 10:32:21 AM » |
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o-rings come in different compositions and hardness - any ideas on best charcteristics? eg would a softer one be better than harder type?
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martin
"my hifi's waiting for a new tube..." Nina Simone 'turn me on'
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rho
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« Reply #89 on: July 31, 2010, 12:02:57 PM » |
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Lenco uses a harder type but maybe that is because there weren't that much options back then.
A softer type could damp vibrations a little more. Traction could be better but that's dependable on surface finish. I don't think wear would be a problem with modern rubbers.
A harder rubber with a rougher finish coulde be a good idea because the contact area with the platter and motor spindle is smaller (less transmission of vibration)
A combination of a softer inner ring and a harder outer ring could be a interesting.
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Rik
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