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Old 05 December 2017, 13:53   #1
patrik
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A3000 daughtercard s-clips

I recently bought an A3000. When dismantling it the first time, I noticed that the daughtercard was only held by the motherboard connector and wasn’t really supported by the chassis. Figured something was missing and first thought it was supposed to have a similar metal support as the A4000 mounted over the top of the daughtercard. When comparing against pictures of open A3000s I could find anything missing though.

However, when I stumbled upon Introducing the C= Commodore Amiga 3000 it showed that I was missing three so called “S clip” or “s-clip”:
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Does anyone have any photos of how these s-clips look in real life and perhaps some measurements?
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Old 05 December 2017, 14:00   #2
dalek
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https://www.thingiverse.com/thing:498218
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Old 05 December 2017, 14:01   #3
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They are also available from shapeways for an eyewatering price https://www.shapeways.com/product/Z5...more-from-shop

it has some measurements too, but not the critical ones.. You could potentially deduct those from the drive tray. The clip itself is symmetrical.

Oh yes, and I hate that spacer with a passion.. Definitely deserves a PDF that could be printed onto an overhead projector transparency and cut out .. the construction paper original is always torn and curled up so bad that it's a real pain to insert the daughterboard. :-)
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Old 05 December 2017, 14:05   #4
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I have 3D printed some of these and have got a CAD model, if it's useful. I've got an original one too somewhere (just the one, hence 3D printing )
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Old 05 December 2017, 19:40   #5
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Thanks everyone for the quick answers!

@Jope:
Could perhaps a replacement spacer be made to have say 2 cm excess material at the top and use it to create a hard 180 degree fold with folds over the middle metal structure a bit to avoid the daugherboard catching on to it? I am just assuming that is what happens? (I have actually not yet re-assembled the machine)

@ajk:
Does your CAD model look like the one posted by dalek? Also, what is the color of the original?
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Old 05 December 2017, 20:06   #6
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Quote:
Originally Posted by patrik View Post
Could perhaps a replacement spacer be made to have say 2 cm excess material at the top and use it to create a hard 180 degree fold with folds over the middle metal structure a bit to avoid the daugherboard catching on to it? I am just assuming that is what happens? (I have actually not yet re-assembled the machine)
Yep. It would be best if it was some kind of stiff plastic, similar to a slim plastic binder or something. The OHP transparency mentioned before would not be robust enough in reality.

The spacer curls at the top, catching onto the daughterboard's component legs, then it rips at the sides where it is held down by the two S-clips and it also curls at the bottom, interfering with the daughterboard connector at the motherboard.

Infuriating. :-D
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Old 07 December 2017, 00:44   #7
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What is the color of the original s-clips?
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Old 07 December 2017, 06:37   #8
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@patrik

Here is a drawing, I think it should have all the important measurements:



The original clips are light grey / beige, about the same colour as the A3000 exterior. If the 3D model helps here is a .dae version: http://ajk.kapsi.fi/retro/amiga/a3000/a3000_spacer.dae

As for the insulation sheet, I fashioned a form-fitting version out back insulation plastic and attached it to the metal bracket with double sided tape. That way it doesn't flap around and get in the way. Haven't got a photo of that right now but I can take one if needed.
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