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I received my Presto Promenade today. This will be my idler project that I posted about at: http://db.audioasylum.com/cgi/m.mpl?forum=vinyl&n=638674&highlight=wilson&r=&session=Here are some pictures:
http://profile.imageshack.us/user/bobroberts/
Here are some questions:
1) What do you know about this motor? I can't find any legible branding, but I do find: 115 volts, ser. # 10R23465M, model 18-330, 60 cyc, 1650 rpm., 19 watts, .25 amps.
2) I have been refering to this website: http://members.myactv.net/~je2a3/roktips.htm, which says that the spindle of the Rek-O-Kuts is 15.5 mm in diameter. This Presto is only about 13 mm. in diameter. Should this be a concern?
3) No ball bearing was in the bearing well. That's not a big deal as I was planning to order a silicone nitrite ball anyway. But, I'm not sure what size to get. (?)
4) Finally, there is a small dimple in the middle of the botom of the spindle. How should I proceed with getting that "micropolished"? I know that I could buff it like I would buff a car, but what about the bottom of the well?
Thanks so much!
Sam
Follow Ups:
I have one like it. It is not a Rek o Kut despite what some will tell you. Presto made turntables for NBC or RCA radio. Can't remember which, the Promenade was their attempt at a consumer device.2) it is not a Rek o Kut
4) The dimple is what sits on the ball bearing, it is ok. don't polish the spindle as it simply is what it is and it will not help. A good oil like Mobile 1 and with a bearing, it will spin as long as my Linn. Besides, once you turn it on and see how the idler works, you will laugh at the idea of polishing the spindle, it is a rough mechanism and very simple.
5) Not mentioned, get the rubber on the idler wheel REPLACED, don't buff it, goo it or whatever, all but replacement are a wasted of time. The rubber was made 50+ years ago, there is no way it will work. Search this website for who does it. Mosin recommended someone and Mosin does a lot of idlers.
Good luck.
When you say "it is not a Rek o Kut," do you mean it the same way Lloyd Benson meant it when he told Dan Quayle that he was no Jack Kennedy?I planned on sending the wheels to Ed Crocket.
I see in your system that you have a t-17 that has better PRaT than your Linn. What other comparisons can you make?
Finally, what size ball bearing did you use? If your T-17 has the same size spindle, the ball should be the same to, I would think.
Thanks.
Sam
is that the bottom of the well tain't nothing to be concerned about. Styles of TT bearings I've encountered, show the ball generally stat/fixed relative to the well/cup (and of course the rotating spindle). If the dimple is fairly pronounced (active bearing surface), then one might proceed to a machine shop, where (likely) the spindle would be pressed out, and however many thousandths milled off the flat/plane/bottom. Removing the dimple, and restoring the surface to smooth/not irregular. I'm not well versed in the theory, but believe it about fewer points in contact. Say in ideal, single point to single point [one single point on the bottom of spindle (thrust pad) ... to any given single high point on the round spherical ball].Elmo MBS/UCI
[Masta of B.S., Univ Coney Isle]
:-)
and you could easilly polish off the hardening and create problems where they don't need to exist
Drop in a quality ball and let *that* settle into the spindleGrins
From the motor data as provided we can deduce that it is some form of induction motor with a rated slip of about 8% (1650 x 2 / 60 x 60 = 0.92). The motor speed will therefore be dependent on the torque drawn and (to a lesser extent) the voltage supplied.It looks like a standard three phase induction motor but I can't see any run caps in the wiring. How many wires does the motor have coming from the casing? If three or more, what resistance reading do you get between each possible pairing of wires?
Mark Kelly
13mm diameter is nothing to be sneezed at. It's still a nice substantial size. As long as it isn't worn, i.e. there's no side play in the bearing, it will be fine.
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...the platter rings like a bell. I mean a really big, beautiful bell. It would make a very impressive doorbell, or an average city square bell.
you could dampen it by lining the underside with something. I have used bluetack, and I think I read of someone using a tarry product of some sort.
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