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Hypernova

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About Hypernova

  • Rank
    Sub Dwarf

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  • Gender
    Male
  • Location
    Crewe
  1. Well I came to the conclusion after chatting with Telescope House that I would have to make my own base plate to cover the hole. I ordered a piece of 2mm ABS plastic from eBay in which I marked out the screws holes and the cutout. I used a dremel tool to cut it all out, it is a little rough around the edges but fits fine and most importantly covers the hole left by the old focuser. Also the new focuser works a treat and I can get focus with all of my eyepieces, even the Antares Speers Waler, using just the one 35mm extension and the built in extender pulled out a little way. Having fine focus again is a real treat after making do with the single speed focuser that came on the scope originally.
  2. Old topic I know but I am having the same issue. I just bought a Revelation Superfocus Rack and Pinion focuser as a replacement for the single speed crayford on my 200p dob. The hole left in the scope is too large and isn't covered by the plate. I can find no reference anywhere to a universal plate at all.
  3. Cool, could you post a picture a let me know a ballpark asking price please?
  4. I'm looking for a decent quality focuser to replace the stock single-speed crayford on my Skywatcher Dob. Ideally something such as a Revelation/GSO dual speed crayford but I could stretch to a Moonlite if it is at the right price. Drop me a PM if you have something suitable. Regards, Tom.
  5. You are right in your assumption, whilst 2 of the screw heads are well hidden by the offset of secondary mirror there is one that protrudes slightly into the light path as seen from the focuser end with the focuser tube fully drawn out to maximise the effect. The offending screw can be seen at the 9 o'clock position, the other two are at 2 o'clock and 5 o'clock or thereabouts but can't be seen. Whether or not this will impact on the views is yet to be seen but the intrusion is minimal. It shouldn't be a problem with a faster scope which may have a larger secondary that will hide over sized screws better but I can definitely see it being an issue with a slow or small aperture scope. Maybe a better source or affordable screws will pop up with suitably-sized heads that are better for this application.
  6. Looking for some thumbscrews to make collimation easier on my Skywatcher 200p dobsonian, I balked at the idea of spending £30+ on a total of 9 screws shipped in from the USA. I decided it would be easier to get some from another source in the UK, it wasn't. Most suppliers won't sell at a reasonable cost to the public and may necessitate ordering large quantities of one item, many don't include VAT until the checkout and even the delivery charges can extortionate for such a lightweight order and many times I could not find the correct length (this was especially true when it came to the secondary mirror screws). I spent ages pouring through the websites of various fastener suppliers such as WDS and RS-Online and eBay but came across the issues above. I tried looking for push on caps for socket cap screws but the only suppliers would've made me buy 20 or more of each size (m4 and m5) + VAT + postage. In one last ditch attempt I came across these guys: https://www.cromwell.co.uk/index.php?q=0&p=browse&c=220104&ss=thumb+screws From them I managed to order exactly what I required which ended up being: 3x M4 X 30mm - For the secondary3x M5 X 15mm - For the primary adjustment3x M5 X 25mm - For the primary locking screwsThis set me back a total of £10.61 with postage, which was £4.99 standard flat rate via Parcel Force, there was no other option. The heads of these bolts are larger than others that I have been looking at which makes things quite tight but still workable on my scope, although this may be an issue on smaller scopes where space is tighter. The secondary screws are very close together but there is still ample room for my fingers to grip them. Around the primary though I hit a small issue, the head of the shorter adjustment bolts is very close to the thread of the locking bolts, dunno why Skywatcher put them so close together. On 2 out of three adjusters there is small but distinct gap between the 2 but on the remaining pair the the head ever so slightly touches the thread and causes a noticeable notchy feeling when turning the mirror adjusting screw. I put this down to slightly sloppy machining of the holes for the locking screws as the screws themselves are true. The screws are still usable and I could actually file the offending thread off where it rubs as it is only the lower 8mm or so of the thread that is engaged in the screw hole, the rest is there to give some height so the pair of screw heads are staggered in height. I hope this information is of use to someone on here as it was to me.
  7. Hypernova

    SGL 10 Chatter :)

    Tent has now dried off and I'm sat enjoying a bottle of local cider procured from the site's shop, and half tempted to take the scope outside and use it for once. I think attending the event has given me a little kick to get back into this observing lark and maybe even finish that dob mount after seeing Shane's handiwork in person
  8. Hypernova

    SGL 10 Chatter :)

    I'm back now, it was a cracking weekend and good see some old friends and plenty of new faces.
  9. I'm booked up now, I need to get my ass in gear and get back into this astro lark. I need a good push me thinks and this might be it
  10. Saw exactly the same fireball just after half 6 from shrewsbury. I had just left a house on my motorcycle after picking up some parts and saw the meteor dropping down through orion to the south. It was partially blocked by trees abs I initially thought it was a firework but immediately recognised it for what it was. I saw what I thought was fragmentation as it descended straight down and it lasted 5 seconds or so abs was quite a bit brighter than venus.
  11. The solar wind has jumped to 473.8 km/s and 5.4 protons/cm3 in the last few minutes!
  12. That's a thing, if we orbited Saturn as one of its moons then how far would we have to be from its surface to experience the same range of tides? My guess is a couple of M km's at the least.
  13. Good show, I'll be doing my dob sometime over the next few weeks as the standard finish is a bit reflective. It is £5 a sheet for flocking from Wilkos http://www.wilkinsonplus.com/dc-fix-fablon/d-c-fix-original-deco-self-adhesive-film-velour-black-348-0005/invt/0309578?VBMST=velour
  14. Jigsaw is on order to be picked up on Thursday afternoon. That suits me fine as I'll be busy all week with work and not really inclined to continue with the base until the weekend. My plan of action is to clean up the template that I made, the curved edge was created with the trammel so is near enough perfect but the straight lines need tidying up a bit. I have figured that by making them neater I'll take enough off to tidy up the corresponding cuts on the actual altitude bearings. The couple of mm that will be trimmed off should pose no issue with regards to rigidity to the 4cm wide spokes that are there at the moment. I will update on the weekend when I have made some more progress. Ad many thanks to those that have contributed to this thread so far, I am still learning the basis of woodworking but am rather enjoying it
  15. I will pick up a jigsaw tomorrow on the way back from work, there is a Screwfix on the way which have this and these in stock which look useful. I might as well get the tools now as you never know when I'll need them in the future.
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