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Old Yesterday, 03:09 PM   #3231
super10018 is offline super10018  United States
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Join Date: May 2010
I highly recommend Niffy's style linear arm. However, I personally prefer angle rail. In my opinion, angle rail provides consistent damping in the vertical plane. Round bar rail may not provide same damping as angle rail due to the size of round bars and thickness of the wheels.

Another thing is very important, too. On Niffy's arm, the carriage won't drop off the rail due to a protection mechanism. If you want to copy Niffy's arm, you need to add a protection mechanism, too. Otherwise, it is very dangerous for your cartridge. I made a ball bearing and glass tube linear arm a long time ago. The carriage dropped off the glass rail on a running table. It almost destroyed my $2000 ZYX cartridge. This was why I changed the rail to Clear Audio kind and never want to make glass tube rail again.
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Old Yesterday, 05:00 PM   #3232
dahlberg is online now dahlberg  Sweden
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I was googling for bearings and found this supplier and a bearing in the search function (3x8x4mm , abec-7).

SMR693C-ZZ #7 LD by Boca Bearings :: Ceramic Bearing Specialists

Prices around 20$ each + ? + ? + ?

Just found it so if someone else who has better knowledge what to look for.....

Edit: Went (almost) through checkout and it settled @ 96$ for 4pc incl shipping to Sweden
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Last edited by dahlberg; Yesterday at 05:08 PM.
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Old Yesterday, 05:47 PM   #3233
carlthess40 is offline carlthess40  United States
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Where would I find some info about air bearings? I want to try and replace air with some type of oil. With a engine, the oil makes it so that the steel and bearing donít even touch each other and help keep it cool
That way you can have a gap in between the bearings and no need for a loud air pump
You would only need a 1/4lbs of pressure or less
If someone has tried this please let me know
Thanks
Carl
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Old Yesterday, 06:29 PM   #3234
super10018 is offline super10018  United States
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Quote:
Originally Posted by carlthess40 View Post
Where would I find some info about air bearings? I want to try and replace air with some type of oil. With a engine, the oil makes it so that the steel and bearing donít even touch each other and help keep it cool
That way you can have a gap in between the bearings and no need for a loud air pump
You would only need a 1/4lbs of pressure or less
If someone has tried this please let me know
Thanks
Carl
It is not a good idea since oil has resistance. In addition to that, it is not easy to seal oil. You create an even bigger problem than an air pump.
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Old Yesterday, 07:15 PM   #3235
carlthess40 is offline carlthess40  United States
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Location: Lake Mary Florida
Just trying to think outside of the box
Or arm on this. Lol
Thanks for your input
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Old Yesterday, 07:37 PM   #3236
warrjon is online now warrjon  Australia
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Location: Terang Vic
Quote:
Originally Posted by dahlberg View Post
I was googling for bearings and found this supplier and a bearing in the search function (3x8x4mm , abec-7).

SMR693C-ZZ #7 LD by Boca Bearings :: Ceramic Bearing Specialists

Prices around 20$ each + ? + ? + ?

I used these


ABU REPLACEMENT 4 X 9 X 4 CERAMIC BEARINGS ABEC 9'S | eBay
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Old Yesterday, 07:53 PM   #3237
dahlberg is online now dahlberg  Sweden
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Quote:
Originally Posted by warrjon View Post
Thanks
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Old Today, 03:52 AM   #3238
hjam is offline hjam  Canada
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Join Date: Mar 2012
Quote:
Originally Posted by super10018 View Post
I highly recommend Niffy's style linear arm. However, I personally prefer angle rail. In my opinion, angle rail provides consistent damping in the vertical plane. Round bar rail may not provide same damping as angle rail due to the size of round bars and thickness of the wheels.

Another thing is very important, too. On Niffy's arm, the carriage won't drop off the rail due to a protection mechanism. If you want to copy Niffy's arm, you need to add a protection mechanism, too. Otherwise, it is very dangerous for your cartridge. I made a ball bearing and glass tube linear arm a long time ago. The carriage dropped off the glass rail on a running table. It almost destroyed my $2000 ZYX cartridge. This was why I changed the rail to Clear Audio kind and never want to make glass tube rail again.
Hi Super10018,

That angle rail looks appealing too. I will likely try to build something that lets me try all three styles.

What did you use for the angle rail and where did you buy it?

How did you cut the Boroscillicate tubing?

I'm guessing you described these in earlier posts, so how far back? I don't wish to make you re-type it all.

Thanks for the tips!

Hugh
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