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About Robert72

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    Star Forming

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  1. Tommi, yes i had a feeling there was a fork mount involved somewhere, but couldn't confirm it because of the front holes. Going off what you said i dug up this: And this explains the front holes, and also demonstrates the two dovetails in action. Eventually I will probably plug the fork mount holes, if re-spraying. Thanks for your reply Tommi, that helps explain what all the holes are for.
  2. Hi, managed to get home and inspect the C8. I was half expecting a cracked/chipped/scratched meniscus. however the optics look pretty darned decent. I have included a couple of pictures to demonstrate (not sure the best way to photo this)........ The focusser is also very smooth, although i don't have another to compare it with. The tube has seen better days, the bolts are corroded/missing, and there is corrosion under the paint on the end caps. Large areas of bubbling are visible. Not too worried about the end caps for now, but can any of you knowledgeable C8 enthusiasts help me identify what all the bolts and bolt holes are for? I don't know if some have been added by previous owner(s). Top view, the three middle bolts are obviously for the upper dovetail bar and the two top left are for a finder i guess, the rear cell has 4 c/sunk bolts for cell attachment, and the front has 3 c/sunk bolts, again for cell attachment. I think this is correct?: Side view, right hand side looking from aft. The three rear holes, two are tapped and the rearmost one is plain, the corresponding front hole is tapped. What are these for?: Underside. More holes for a lower dovetail: Left hand side, looking from aft. More mystery holes. That front hole is quite close to the front cell bolt: I would be extremely grateful if anyone could confirm that my guesses on the bolt functions is correct, and identify the mystery holes. The current plan is to eventually do some kind of star testing in the current state, and then perhaps strip down and do a mild refurb. However given our current situation and work commitments none of this will happen till 2021! Regards, please stay safe and healthy.
  3. Or carbon? You can get stock carbon that size. Not too sure about price? About £150?
  4. Thanks for the replies. After finding a bit of time to do a more detailed search, it seems (unsurprisingly) that there are some decent articles about disassembly etc. out there.
  5. Last night I purchased a fairly tatty C8-CF from RVO https://www.rothervalleyoptics.co.uk/second-hand-celestron-8-sct-carbon-optical-tube-assembly.html I probably should have asked this question here first, but just how much can these things be disassembled? Not too sure about the mirror retaining/focussing system, meniscus lens etc. Looking forward to carrying out a bit of a restoration on this scope, seems like a lot of scope for not a lot of cash.
  6. Filleting added to mould reinforcements, to overcome bagging voids..... This is just anti-crack filler. Next I will give the whole of the mould a coat of primer. There are a few sharp spots that may be piercing the bag when under hard vacuum (I am having issues achieving a full seal on the bag), the primer will cover the minor ones, the remainder being easy to spot and rub down.
  7. Wow, it's been a while since I posted. Still no progress as of yet, with work and other stuff. The outer reinforcements will be getting filleted, as these are giving rise to mould/bag interface voids, where the bag doesn't want to conform. And another attempt at bagging. Maybe next weekend.
  8. Well another update. The bagging consumables have been applied..... So in there now is polyester peel ply, infusion mesh (400mm at each end), and vacuum connectors with infusion spiral at the uptake end. A new bag has been applied, as the last one was made of two pieces with 6 joins. I left the old outer bag on though for added puncture protection. The new bag is single piece with one join at one end...... The drop test seems to be holding up, however I think there is a slight leak at the catch pot. The infusion spiral also need a slight reposition to get it back on to the mesh. Just tweaks here and there, and the resin goes in asap. Have a nice weekend folks!
  9. The innermost skin is now in..... If I manage to get back on Friday, then it is full ahead with the infusion bagging materials Saturday morning/afternoon, and infusion Saturday afternoon/evening. I think I may have bridging issues though especially with the innermost materials. If so it makes life more difficult when it comes to installing the rear cell.
  10. First layer of inner skin is going to be laid in four overlapping segments. Here is the first one..... All of the segments are now in, and looking good. The final, and innermost skin I will put down in one piece, so only one edge is visible. This will give 2/3 inner skins. Should be enough I think. All being well, I think we should be looking at next weekend for an infusion.
  11. The core material is in. This is 3mm 3D CORE PET 100 Foam......
  12. So, continuing with the first attempt after all. Vacuum bagged to attempt to de-bulk the outer skin, so I can cram in the core material, then the inner skin. Images:
  13. MBJ, can you post a pic of the SW diagonal?
  14. OK, so the first layup attempt didn't work out very well at all. I managed to get the cloth into the mould but it was a bit of a shambles. On hold for a bit until I do a bit of head scratching. Current thinking is to use a single, heavyweight (650g) sheet for both the inner and the outer in order to simplify and rationalise the layup. And possibly give the mould a spray of epoxy compatible polyester gelcoat in conjunction with a spray of acetone on the inside surface of the cloth to tack it to the mould. Yes, plenty of options. Spraying the mould will require some warmer weather, in the mean time I am going to step back for a bit and have a think about the best way ahead.
  15. External formers completed. The roundness is very good now, I think it may have been out more than I thought, so I am glad I did that..... Cutting the cloth has commenced. Just to be a bit different the outer laminate is going to be a combination of carbon plain weave and carbon/kevlar plain weave (this may go part way to overcoming brittleness Rusty?). This is very difficult to achieve with any semblance of professionalism or neatness, so I am either being very brave or very stupid. Quite probably the latter. At least it will be interesting if nothing else.....
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