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adk_mechetech
Joined: 24 May 2020
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Location: 06076
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murff
Joined: 27 Oct 2009
Posts: 594
Location: Switzerland
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 Posted: Tue May 26, 2020 3:00 pm Post subject: |
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One first place I would mention the usability of a newly repaired Curta. For me the value of a Curta is given by the complete operational state and an overall nice and clean optic.
The monetary value of a Curta will not influenced by replacing a broken part with a non-original duplicate.
I think the clearing lever should be as close to the original as possible - it's not necessary to change the form.
Also important is the fact that you need the fitting rivet (and rivet tool) - and more important, the skills to replace the clearing ring on your Curta!
Good luck with this project...
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adk_mechetech
Joined: 24 May 2020
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Location: 06076
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| Posted: Tue May 26, 2020 3:23 pm Post subject: |
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Thank you for the input!
I agree, the value to me is in a fully functional Curta. The only reason to change the design would be to make the ring more robust and avoid future breakage. I believe the original part is aluminum, and I was going to see if there would be any problem using a different material. If it can be done, the original design may be stronger.
The rivets are not too complicated to make. They are small, but very simple.
I have been looking for information on the original assembly tools and have not found much. There are a few ways it can be done without the original tools. |
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murff
Joined: 27 Oct 2009
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Location: Switzerland
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| Posted: Wed May 27, 2020 3:04 pm Post subject: |
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The only related tool is the "Riveting tool 109.108":
A small spring-loaded tube helps to have the "10.033 - Flat spring" in position during the hit onto the rivet.
Overvew of the four related parts
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adk_mechetech
Joined: 24 May 2020
Posts: 4
Location: 06076
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| Posted: Thu May 28, 2020 8:36 pm Post subject: |
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| murff wrote: | The only related tool is the "Riveting tool 109.108":
A small spring-loaded tube helps to have the "10.033 - Flat spring" in position during the hit onto the rivet.
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That looks about like what I imagined it would be. The punch point for swage is probably 90 degrees or a hair over that I would guess based on the engineering drawings.
Looking at picking a couple of suppliers to do a 2 piece sample run. One will be investment cast, the other CNC machined. |
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Pete
Joined: 04 Mar 2010
Posts: 203
Location: Great White North
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| Posted: Fri May 29, 2020 6:55 pm Post subject: |
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Excellent idea gents. I agree these machines wouldn't be devalued by a fabricated replacement part, "resto-mod" is what we're going for rather than originality. I wouldn't want a nonfunctional machine even if it was a rare one, #40579 lives on my desk and I use it frequently, as the maker intended, that's the charm of them for me too.
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adk_mechetech
Joined: 24 May 2020
Posts: 4
Location: 06076
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| Posted: Fri May 29, 2020 11:21 pm Post subject: |
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| Pete wrote: | | Excellent idea gents. I agree these machines wouldn't be devalued by a fabricated replacement part, "resto-mod" is what we're going for rather than originality. I wouldn't want a nonfunctional machine even if it was a rare one, #40579 lives on my desk and I use it frequently, as the maker intended, that's the charm of them for me too. |
This is going to be a spare time project for me, but I fully intend to get some samples ordered in the next couple weeks.
For material, I have chosen 17-4 as it is easy to machine, strong, inexpensive, and can be PVD coated to get the black color. I have seen PVD coated 17-4 and a color and depth of finish can be attained that is very close to the original anodized aluminum. Because of the material change I am also sticking with the original design/geometry since it will be significantly less prone to breaking.
The second step is to get rivets made, however I am considering an alternative to the swage to attach it to the clearing ring. I need to study the engineering drawings and consider the design before making a decision. Regardless, the rivets are a fairly simple part and I can get them made too. |
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