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Re: [ATM] too thin tube?

To: "Ukyo Chen" <atm@atmlist.net>
Subject: Re: [ATM] too thin tube?
From: Richard <cnc@cncservo.co.uk>
Date: Mon, 26 Sep 2005 18:56:32 +0100
Cc: atm@atmlist.net
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Reply-To: Richard <cnc@cncservo.co.uk>
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Hi Ukyo,

Monday, September 26, 2005, 6:11:53 PM, you wrote:

UC> I got a 129mm duralumin (enhanced Al) tube, want to make
UC> screw thread inside it and put 127mm lenses in. The question
UC> is, if 1mm is too thin for a 127mm duralumin tube?

The only way you will thread it is to screwcut it in a lathe and
I would think it is too flexible to easily hold it in a lathe.
You will also have to use a very fine thread to avoid weakening
the tube too much. It really needs to be at least twice the wall
thickness. 2.5mm or 3mm wall should be OK.

-- 

Best regards,
  Richard in the UK

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References:
- [ATM] too thin tube?
  - From: "Ukyo Chen" <ukyochen888@hotmail.com>

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