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 Post subject: Re: Tips needed on this TYPICAL pot metal tonearm
PostPosted: Thu Feb 08, 2018 3:12 pm 
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Victor IV
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Joined: Mon Jul 25, 2011 8:27 am
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Location: Blairstown, New Jersey 07825
JerryVan - I may try that. My neighbor has a wood lathe and I can make a nice hardwood dowel instead of using metal. Thanks for the tip. :) I really don't want to break the original elbow since a repro will cost me $135.00 !!


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 Post subject: Re: Tips needed on this TYPICAL pot metal tonearm
PostPosted: Thu Feb 08, 2018 3:17 pm 
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Victor IV
Joined: Mon Aug 24, 2009 3:08 pm
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Location: Harrison Township, MI
Maple would be good. Would be nice too if you had a washer of just the right diameter to slip in there first.


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 Post subject: Re: Tips needed on this TYPICAL pot metal tonearm
PostPosted: Thu Feb 08, 2018 4:27 pm 
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Victor V
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Location: Northeast Pennsylvania
Jerry -

That's a good idea... I never thought of trying to press / drive the elbow out. :oops:


When I have gotten them apart, I usually sand--down the neck of the elbow, carefully, with black silicon-carbide auto-body paper, until I have a nice fit in the flange. I usually finish them off with 600 grit, wet-sanded with light oil or mineral spirits.

Any reason I'm missing why we shouldn't dress-down the swollen neck, as opposed to enlarging the bore of the flange?

Or is it six of one, half-dozen of the other ?

:monkey:
De Soto Frank


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 Post subject: Re: Tips needed on this TYPICAL pot metal tonearm
PostPosted: Thu Feb 08, 2018 4:36 pm 
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Victor IV
Joined: Mon Aug 24, 2009 3:08 pm
Posts: 1742
Location: Harrison Township, MI
De Soto Frank wrote:
Jerry -

That's a good idea... I never thought of trying to press / drive the elbow out. :oops:


When I have gotten them apart, I usually sand--down the neck of the elbow, carefully, with black silicon-carbide auto-body paper, until I have a nice fit in the flange. I usually finish them off with 600 grit, wet-sanded with light oil or mineral spirits.

Any reason I'm missing why we shouldn't dress-down the swollen neck, as opposed to enlarging the bore of the flange?

Or is it six of one, half-dozen of the other ?

:monkey:


Frank,

Having a metal lathe, it's far easier for me to enlarge the hole in the base. If I tried to machine the elbow down, it would be a very difficult thing to fixture, (hold on to), in a machine, whereas the base flange readily fits in a lathe chuck, takes 10 minutes to re-size, and produces an accurate result. If I had to do resize either the elbow or the flange by hand, (with sandpaper), I'd probably choose to modify the elbow. Still, a sanding drum in a drill press wouldn't be a bad option to open up the hole in the flange. I guess I hate to monkey too much with a delicate pot metal elbow.

Short answer: Six of one, half-dozen of the other. :)


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 Post subject: Re: Tips needed on this TYPICAL pot metal tonearm
PostPosted: Thu Feb 08, 2018 4:40 pm 
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Victor V
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Location: Northeast Pennsylvania
Jerry -

Fair enough.

I don't have a lathe / lathe skills, but can appreciate what you describe in terms of how to hold the work piece.

Thanks !

Frank
De Soto Frank


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 Post subject: Re: Tips needed on this TYPICAL pot metal tonearm
PostPosted: Thu Feb 08, 2018 7:10 pm 
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Victor VI
Joined: Tue Mar 23, 2010 7:00 pm
Posts: 3094
Location: Western, WA State
Whatever you do, never use a hacksaw. Put metal is tough to cut with that. The teeth slip and the back and forth torque will cause the parts to break. The other methods discussed is the way to go.
Harvey Kravitz

De Soto Frank wrote:
Harvey, and others - Have you ever carefully run a hacksaw-blade in the throat of the elbow, carefully cutting an axial slot through the pot-metal neck, allowing some flex / relieving pressure of the swollen pot-metal ?


I've used this trick on machinery to remove stuck bushings...


Sounds almost like an act of desperation, but might not be as bad as crushing an elbow from repeated torque ?

Thoughts ?


Frank


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 Post subject: Re: Tips needed on this TYPICAL pot metal tonearm
PostPosted: Fri Feb 09, 2018 9:01 am 
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Victor V
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Location: Northeast Pennsylvania
Got it.

Thanks, Harvey !
De Soto Frank


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 Post subject: Re: Tips needed on this TYPICAL pot metal tonearm
PostPosted: Tue Feb 13, 2018 2:47 pm 
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Victor IV
Joined: Mon Aug 24, 2009 3:08 pm
Posts: 1742
Location: Harrison Township, MI
Brian,

Have you had any luck yet getting this apart? Hope so!


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